How to Stick Welding: A Beginner’s Step-by-Step Guide

There is a particular kind of smell that only exists in a garage on a Saturday: hot steel, flux, and the faint tang of ozone. You push the electrode holder forward, expect a shower of sparks, and instead get a blistered blob that crumbles when you tap it. Almost every welder has welded that first bead, and almost every welder has wondered whether the machine, the rod, or their own technique is to blame. This guide walks through stick welding (SMAW) the way a good shop teacher would — one decision at a time — so you can turn that first ugly bead into a repeatable, inspectable weld.

What Stick Welding Actually Is (And Why It Still Matters)

Stick welding has an unfairly boring name. The technical name is shielded metal arc welding, or SMAW, and the “stick” is simply the coated rod you clamp into the electrode holder. The process itself is simple: an electric arc melts a metal rod, and the coating burns into a gas that protects the hot metal from the air. The rest of this guide is about doing that well.

Touch the rod to the workpiece to strike an arc. The arc melts the rod tip and feeds molten metal into a pool in the joint. As the coating burns away, it releases a shielding gas that keeps oxygen and nitrogen off the pool. The pool freezes into a bead of weld metal, and the spent flux floats on top as slag, which you chip off between passes. No cylinder, no wire feeder, no torch. One consumable, one arc, one bead.

The Four Building Blocks You Are Really Controlling

Building block	What it is	What you control
Arc	The discharge between the rod tip and the work	Length, direction, and whether it wanders
Pool	The puddle of molten filler and base metal	Size, shape, and temperature
Slag	The cooled flux residue on top of the bead	Clearing it fully between passes
Bead	The solid weld metal left behind	Width, reinforcement, profile, and fusion

Read those four and stick stops being guesswork. A wandering arc, a balled-up pool, a bead with dirt trapped in it: each failure points back to one of them.

Why Stick Welding Refuses to Die

Other processes are faster and cleaner in the right conditions, but stick keeps winning on portability, forgiveness, thickness range, and one more thing: codes speak its language.

• No shielding gas cylinder. That single fact is why stick is the go-to for field work, farm repair, pipeline work, and remote sites where a cylinder is a burden.
• It forgives dirty steel. Cellulosic electrodes such as E6010 and E6011 run a deep-penetrating “digging” arc that powers through rust, oil, paint, and dirt. Most other processes demand clean metal and punish you for skipping prep.
• It handles a wide thickness range, from thin sheet to heavy plate, with the same basic setup and often the same rod.
• Codes reference it. AWS D1.1/D1.1M:2025-AMD1, the Structural Welding Code–Steel, is the worldwide standard for welding structural steel and defines how procedures, welders, and welds are qualified and accepted. Stick is the process most inspection plans and qualification records are written around, and D1.1 requires preheat and interpass temperatures on every welding procedure specification.

For the case made by someone who clearly enjoys it, see the advantages of stick welding.

The Honest Limitations

Stick is not the best choice for every job, and anyone who tells you otherwise is selling something. It is slower than MIG, less precise than TIG, throws more spatter, and leaves more slag to clean up. On thin, cosmetic, or visible fabrication it will never look as neat as a gas-shielded process. For long production runs, striking, filling, and chipping is tiring next to continuous wire feed. Our guide to air gas welding explained covers what the shielded processes do differently.

Reading the Numbers on a Rod Box

Every electrode carries a classification such as E6013 or E7018, and the “60” or “70” is a strength class measured in ksi (thousand pounds per square inch). AWS D1.1 lists E60-series electrodes at 60 ksi nominal tensile with 48 ksi nominal yield, and E70-series electrodes at 70 ksi tensile with 58 ksi nominal yield. Carbon steel SMAW electrodes fall under AWS A5.1, the specification for carbon steel electrodes for shielded metal arc welding, which sets how each classification is made and what it must deliver.

In practice, the 70 ksi class is where structural and pressure work happens, and low-hydrogen electrodes such as E7018 are specified wherever weld-metal mechanical properties and hydrogen control matter. A fuller breakdown of each digit lives in the all position welding rod guide.

Where Stick Rules the Shop

Look around any working industrial site and you will see stick in action: structural steel erection, pipeline and pipe fitting, shipbuilding, mining and oil and gas field repair, farm and equipment repair, and endless hobby work. The deciding factor is rarely speed. It is that one person, one machine, one rod, and no gas bottle can produce a code-compliant weld where nothing else works.

Choosing Your Machine: What You Actually Need to Start

Most beginners buy a welder like a coffee maker: whatever is on sale, with whatever accessories come in the box. Then they wonder why the arc sputters and the bead looks like a caterpillar. The machine is rarely the problem, but the wrong type makes everything harder.

Constant Current: The Only Power Source That Works

Stick welding (SMAW) needs a constant-current power source, the most important spec on any welder you consider. Such a machine holds the amperage you dial in almost no matter what happens to the arc.

A stick arc is self-regulating. The amperage knob controls current, while arc voltage simply follows the arc length the welder holds: shorten the arc and voltage drops, lengthen it and voltage climbs.

Contrast that with a constant-voltage source, what MIG and most flux-cored wire welders use. Those are regulated by the wire feed, so the machine slams voltage at the arc to keep it stable. Plug a stick electrode into that machine and you get a “spatter bomb”: the arc sprays everywhere and the bead looks like burnt cabbage.

Transformer, Inverter, or Multi-Process?

Three families of machines matter here.

• Traditional transformers are old-school bench units built around a heavy magnetic core. Rugged and long-lived, they are heavy, noisy, limited in output range (often topping out around 100 to 140 amps on stick), and offer no hot start, no arc force, and on some models a tap switch.
• Inverters use solid-state electronics that step current up and down thousands of times per second, so you get less weight, more reliable starts, and features transformers never had: hot start (a surge of current when the rod touches the work), arc force (extra current when you shorten the arc), and sometimes pulsing for control on thin sections.
• Multi-process inverters add MIG and TIG to the same box. They cost more, but if you might weld aluminum, fabricate sheet parts, or move to TIG later, one machine covers everything. Make sure the TIG function is genuine lift-arc, not a simplified DC-only torch with no foot control.

How Many Amps Do You Actually Need?

For most first-year work, roughly 20 to 140 amps covers most 3/32 in and 1/8 in rod work and every beginner project. At 5/32 in rod you want 150 amps and up, so look at the top of the range if heavier plate is ahead.

One caution about rod charts: the old “1 amp per thousandth of an inch of rod” rule of thumb is a trap that lands beginners in the wrong range. The documents that define acceptable amperage are AWS A5.1 and the manufacturer’s data sheet. Follow those, and ask the manufacturer when in doubt.

Look at duty cycle. A machine rated 20% duty cycle is for intermittent work: weld a few minutes, let it cool. A shop welder rated at 60% duty cycle sustains long passes and keeps the bead consistent. A low duty cycle does not damage the machine; it just makes your hands miserable and your beads inconsistent as output droops with heat.

What You Need Besides the Machine

The machine is maybe half the cost of getting into stick welding:

• Electrode holder (stinger) sized for your rod. A 1/8 in collet handles 3/32 in through 1/8 in rod.
• Work lead and ground clamp. Spend on the clamp: a spring-loaded copper or brass model grips far better than screw clamps.
• Welding leads of adequate gauge and length. Thin, long leads choke the arc.
• Chipping hammer, wire brush, and pliers for cleaning slag and handling hot work.
• Safety glasses under a properly fitted auto-darkening helmet with adjustable shade.
• A rod oven for low-hydrogen electrodes. They are hygroscopic, meaning they absorb moisture from the air, and that moisture causes hydrogen-induced cracking and porosity. Store them heated, per code.

If you ever plan to work on aluminum, aluminum MIG welding and aluminum flux core welding both need a dedicated spool gun and a machine that can push the right wire, a separate purchase decision.

Is a Starter Kit Legitimate?

Yes, with conditions. A small inverter starter kit with a machine, holder, clamp, light helmet, and a few rods is a legitimate way to learn. For a few hundred dollars you get hot start and arc force, enough to teach you SMAW basics.

Where it falls short is scale and duty cycle. Structural work, code-controlled fabrication, and production need a full-size machine. OSHA’s welding and cutting rules and the AWS D1.1 code set expectations for power sources, leads, and PPE. Check the machine against the code before you buy.

I’ll rewrite this section to hit the 600–900 word target while keeping all facts and links intact.

Choosing the Right Electrode: A Practical Guide to Rods, Polarity, and Amperage

The fastest way to a good stick weld is usually not a better machine. It is the right rod in the right holder, set to the right amperage, connected to the right polarity. Beginners tend to treat electrodes as interchangeable, and that is exactly how they end up chasing a problem that was decided before the arc was even struck.

Good news: the AWS classification system that names every rod is not complicated once you know what each digit means. Learn to read “E7018” and you can walk into any supply house and tell whether what you are holding belongs in the job in front of you.

How to Read an AWS Electrode Designation

Every stick electrode carries a code such as E6010, E7018, or E7024-1. AWS A5.1 governs how that code is built, and the same logic that Lincoln Electric explains on its classifications page is worth learning by heart.

• E means electrode, a consumable rod that melts into the joint, not a filler wire you feed separately.
• 60 or 70 is the tensile strength class in ksi. A 60-class electrode produces weld metal rated at 60,000 psi minimum tensile, a 70-class at 70,000 psi. Higher is not automatically better; it reflects the strength of the deposit.
• The third digit is the position code. A 1 means the electrode is approved for all positions, which covers E6010, E6011, E6013, and E7018. A 2 restricts the electrode to flat and horizontal positions, which is exactly what E7024-1 carries.
• The last digit describes the coating chemistry and the current type it works with. A 0 is cellulose sodium, 1 cellulose potassium, 2 titania sodium, 3 titania potassium, 4 iron powder, and 8 low hydrogen potassium iron powder.

The Six Rods Every Beginner Should Know

Electrode	Polarity	Positions	Arc Character	Typical Use
E6010	DC electrode positive (DCEP) only	All position	Deeply penetrating, digging arc, heavy spatter	Pipe root passes, dirty or rusted steel, structural repairs
E6011	AC or DCEP	All position	Penetrating digging arc, slightly rougher than E6010	Farm, field, and maintenance work where DC is unavailable
E6013	AC or DCEP	All position	Soft, stable, low spatter, easy slag	Clean new sheet metal, home projects, thin gauge
E7014	AC or DCEP	All position	Smooth, higher deposition, forgiving puddle	General fabrication, structural work where fill rate matters
E7018	AC or DCEP	All position	Stable, slightly harsh, low hydrogen deposit	Code-controlled structural work, pressure equipment, heavy plate
E7024-1	AC or DCEP	Flat and horizontal fillet only	Fast, high deposition, iron powder	Production fillet welding, frame and rack fabrication

The E6010 is the most penetrating of the common carbon steel rods and the reason it dominates pipe root passes. Its arc digs through rust, oil, paint, and dirt, which means you can lay a root pass on a joint that was never cleaned. The tradeoff is that it only runs on direct current, electrode positive. E6011 gives a similar digging arc but also works on AC, which is why it remains a staple for farm, field, and maintenance work where DC machines are rare. E6013 is the opposite personality: a soft arc with minimal spatter, moderate penetration, and slag that peels off easily, a favorite for clean, new sheet metal. E7014 is a smooth, higher deposition general fabrication rod. E7018 is the low hydrogen workhorse, used wherever hydrogen control and higher mechanical properties are required, and it is the rod that shows up under AWS D1.1 structural provisions. For one Lincoln Electric product, vertical-down welding is explicitly excluded, so check the data sheet before assuming a position is allowed. E7024-1 fills metal faster than almost anything else in the stick world, but its “2” position code limits it to flat and horizontal fillets. Never attempt it overhead or vertical.

For a broader look at how rod selection interacts with base metals, our guide to alloy steel welding electrodes covers the coating families you will meet once you move past plain carbon steel.

Amps by Diameter

Amperage is not printed on the AWS code, so you will find ranges on the rod’s data sheet and on the box. The table below is a manufacturer-derived example, useful as a starting point for setting your machine.

Electrode	3/32 in	1/8 in	5/32 in
E6010 (DCEP)	50–85 A	75–135 A	100–175 A
E6011 (AC)	40–90 A	65–120 A	—
E6013 (AC)	75–115 A	110–140 A	160–200 A
E7014 (AC)	80–100 A	110–155 A	150–225 A
E7018 (AC)	80–120 A	100–160 A	140–210 A
E7018 (DCEP)	—	90–160 A	—
E7024-1 (AC)	—	115–175 A	180–240 A

Choosing a Diameter

There is no universal steel thickness to rod size table, and anyone who hands you one is oversimplifying. Joint preparation, welding position, heat input, the number of passes, and the governing welding procedure specification all influence the right diameter. A 1/8 in rod on 1/4 in plate with a beveled joint and a second pass looks completely different from the same rod on a lap joint.

As a general rule, match the rod diameter to the thickness of the material you are actually melting, not the thickness of the finished assembly. On plate thicker than about 1/4 in, a 1/8 in rod is still the most common beginner choice, and it is a good one, because it gives you a visible puddle, a bead you can watch, and enough margin on either side of the target amperage. A 1/8 in E6013 or E7018 is the single most common beginner rod for good reason: it is easy to control, works in every position, and runs comfortably on almost any machine that makes 140 amps. Many experienced hands still carry only 3/32 in and 1/8 in rods for most shop work.

Use 3/32 in on thin material and light-gauge work where you need lower heat. Move to 5/32 in and 3/16 in for heavy plate, thick pipe, and multipass joints where a bigger puddle actually saves time. If your machine cannot reach the amperage a rod needs, the rod is wrong for your machine, not the other way around.

Storage and Moisture Control

Low hydrogen electrodes are the ones that punish sloppy storage. The “8” coating type in E7018 is designed to keep moisture off the deposit, and a rod that has absorbed water defeats the entire purpose. Store E7018 in a rod oven or a sealed moisture-proof box, keep the container closed between welds, and never leave rods lying loose on a bench or in a truck bed overnight. If rods come out of a cold shed in a humid climate, warm them before opening the container, otherwise you will condense moisture right onto the coating.

Cellulose rods like E6010 and E6011 are less fussy, but they still degrade when damp. A rod that feels soft, crusty, or fuzzy is a rod that will arc erratically and spit slag. Throw it out rather than fighting it.

Safety First: PPE, Fumes, Fire, and the Regulations That Cover You

Stick welding puts a 6,000-degree arc inches from your face, heats steel until it glows, and fills the air with metal fumes, usually in a space as small as a garage. None of that is dangerous if you respect it. The gap between “a few practice beads” and “eight hours with no fume extractor” is where most avoidable injuries begin.

The Rules That Cover You

For most shops the governing rules live in OSHA 29 CFR 1910 Subpart Q, “Welding, Cutting and Brazing,” built from five pieces that OSHA’s welding standards page lists: 1910.251 (definitions), 1910.252 (general requirements), 1910.253 (oxygen-fuel gas welding and cutting), 1910.254 (arc welding and cutting) and 1910.255 (resistance welding).

Two matter most to a beginner. 1910.252 sets general requirements: fire prevention, hot work controls, PPE, ventilation and confined-space precautions. 1910.254 covers arc welding and cutting, including operator training, electrode holders and machine grounding. On a construction site the parallel rules in 29 CFR 1926 Subpart Q (1926.252 and 1926.254) apply instead, and your employer’s safety program is built around them.

PPE: Gear Up Before You Strike

1910.252 requires protective clothing suited to the size, nature and location of the work, per 1910.132, the PPE standard. Scale up for a structural fillet weld on a bridge beam, down for light-gauge shop work. A supplier catalog is the easiest way to compare helmets and gloves side by side, like this Airgas welding supplies buyer’s guide.

Item	What to look for
Welding helmet	ANSI Z87.2 certified. Auto-darkening with adjustable shade (typically 9–13) is the safest beginner default, since it protects you during strike, cleanup and repositioning.
Safety glasses	Side-shielded glasses worn under the helmet, required by 1910.252 for anyone in a welding helmet.
Clothing	Flame-resistant cotton or aramid, no synthetics that melt, sleeves closed, chest and arms covered.
Gloves	Leather welding gauntlets, sized for the electrode holder and hot work.
Footwear	Safety-toe leather boots with slip-resistant soles.
Hearing	Plugs or muffs when grinding, chipping or working in an enclosed space.

For helmet shade, industry practice for SMAW on mild steel sits at shade 10 through 14, with 8 through 10 reserved for light-gauge and low-current work where a darker lens would hide the puddle. If unsure, start lighter and adjust. Past carbon steel, alloy steel welding electrode selection, use and safety change too, because heat input and fume profiles shift with the base metal.

Fumes: The Hazard You Cannot See

Welding fume is a mixture of metal oxides, and mild steel fume is the least dangerous version. Under 1910.252, general industry ventilation guidance points to a minimum of 10,000 cubic feet (284 cubic meters) of air per welder for general welding and cutting. That is a floor, not a goal, and it assumes an open space and work that is not happening in a corner.

Measurement data makes the case for local exhaust. The NIOSH Engineering Controls Database reports welding fume concentrations of 2 to 60 mg/m³ without local exhaust ventilation, falling to 3 to 13 mg/m³ once ventilation is applied. That is the argument for a fume extractor or small hood: general ventilation dilutes, local exhaust captures at the source. Other processes carry their own hazards too, as Air Gas welding process and safety explains for oxy-fuel work.

NIOSH’s welding topic page adds scale: census data indicate over 700,000 US workers are involved in welding or allied processes, and welders show roughly a 40 percent increase in relative risk of lung cancer. Confined space welding is called out as significantly increasing exposure, which is why 1910.252 treats confined spaces as a separate hazard category requiring an attendant and gas monitoring.

Manganese, Anthrax and the Metals That Bite Harder

Manganese is the metal most associated with long-term welding harm. NIOSH’s manganese pocket guide sets a recommended exposure limit of 1 mg/m³ as an 8-hour time-weighted average and 3 mg/m³ as a short-term limit. OSHA’s permissible exposure limit is a 5 mg/m³ ceiling, while ACGIH’s threshold limit values are far lower, at 0.02 mg/m³ respirable and 0.1 mg/m³ inhalable, which shows how contested the exposure is. NIOSH states that prolonged exposure above 1 mg/m³ may lead to a Parkinsonian syndrome known as manganism, with tremors, gait problems and rigidity that can look like Parkinson’s disease.

NIOSH has also identified welder’s anthrax, a rare occupational disease among metalworkers caused by bacteria that produce anthrax toxin, with research suggesting metal fume exposure may raise the risk of lung infection.

Fire Watch and Hot Work Permits

Fire is the hazard that ends careers. OSHA requires a fire watch where fire hazards cannot be relocated away from the work area, such as welding inside a vessel, on a scaffold, or where the work sits below a combustible floor. A fire watch is a dedicated person with no other duty, an extinguisher within reach, and the authority to stop the job. Most hot work programs keep that watch in place for a minimum period after the last arc, commonly 30 minutes, so smoldering material has time to reveal itself.

Many employers also run a formal hot work permit: a written authorization identifying the location, the work, the fire watch and the controls in place before an arc is struck. And the rule that matters most is simple. From 1910.252, welding and cutting must not proceed if hazards cannot be removed or adequately guarded. If you cannot move the combustibles, if you cannot get ventilation, if you are unsure what is behind that wall, you do not get to start. Walk away, ask, then weld.

Learn the rules before your first bead rather than after a burn or a diagnosis. For a broader look at the process itself and where it still wins, see the advantages of stick welding.

spatter, and the fish-mouth porosity you will meet in troubleshooting later.

Holding the Electrode and Judging Arc Length

Hold the holder firmly but not white-knuckled. A relaxed grip lets you feel what the arc is doing, and a tense grip shakes the electrode, which makes the arc wander. Keep your wrist steady and your forearm aligned with the travel path.

The electrode should sit at roughly a 90-degree angle to the work, then tilt 5 to 10 degrees in the direction you intend to travel. This drag technique is standard for flat and horizontal work with a cellulose rod like E6013, giving a flatter bead with shallower penetration and better control of the puddle. Push tilts the electrode away from travel and produces a more convex bead with deeper penetration, useful on heavy plate or fillets but harder to control and spatterier on E6013. Pick one and stay with it.

Judge arc length by ear, not by eye. A short, crackling arc of about 1/8 inch gives the best fusion and least spatter; a long, hissing or popping arc means you are too far away. When the arc is right you hear a steady, sharp crackle rather than a hiss. Because arc length sets the voltage and the machine holds current, a wandering arc length means a wandering bead.

Making the Strike

Touch the electrode tip to the work with the tip angled slightly back, like a starter pistol. Do not slam it down and hold it there. Drag the tip very slightly along the work to break the surface oxide and establish a low-resistance contact, then pull back about 1/8 inch to set your arc length. That scratch-and-lift motion is what keeps the electrode from freezing to the plate.

If you are stuck, the cause is usually not the machine. It is too much amperage for the rod diameter, a work lead attached to the wrong spot, or a dirty holder. Miller’s common electrode guide covers the rest of the causes.

Stringer Beads, Weave Beads, and Travel Speed

A stringer bead is a straight drag with no side-to-side motion. It is the simplest, deposits the most heat per inch of travel, and is what you should be practicing. Weaving zigzags the electrode to spread heat over a wider area, which helps on thick plate or a hot joint.

Limit weave width to about 1.5 times the electrode diameter. A 1/8 inch rod should never weave much more than 3/16 inch, because going wider raises the chance of incomplete fusion at the toes, where the puddle was disturbed and the base metal never stayed molten long enough to wet out. The AWS electrode classification reference from Lincoln Electric is a good companion read on how rod choice shapes the puddle.

Travel speed is the third variable and the one nobody mentions on day one. Too fast leaves a narrow, cold, undersized bead with poor fusion. Too slow piles up heat, distorts the plate, and burns through thin material. With no standard to match, aim for a bead width of roughly 1.5 times your electrode diameter. A 1/8 inch rod at 110 amps should lay down about a 3/16 inch wide bead.

Chip, Brush, Inspect, Repeat

Let the slag cool, chip it off, and clean the bead with a wire brush before laying the next pass. Slag left in the joint is a classic source of inclusions and lack of fusion, so welding over it buries a defect you cannot see or fix without cutting the joint out.

Cleaning each pass takes twenty seconds and buys you a visible record of the previous one. You can spot undercut, a cold lap, or a lumpy toe before the next pass hides it. It is the single best habit for improving quickly, because you get feedback on every pass instead of only on the finished weld.

Once the arc is stable and the bead is consistent, you are ready for position work, where gravity starts fighting you. An all-position welding rod guide will help you pick the right consumable for the vertical and overhead passes ahead.

Welding in All Four Positions: Flat, Horizontal, Vertical, and Overhead

The gap between a competent welder and a good one rarely comes down to talent. It comes down to whether the bead stays consistent when the joint is under the bench, on a tower leg, or directly overhead. Stick welding is one of the few processes where a single electrode can qualify a welder in every position, which is why it remains the default qualification for structural steel erection and pipeline work.

Whatever the position, three things change: where gravity pulls the molten pool, which way you travel, and how much time you have to react. A bead that looks effortless lying flat will run, undercut, or burn through the moment you rotate the workpiece.

The AWS Position Code System

Every qualification test, procedure specification, and inspection report uses a shorthand for position, so learn it early. The AWS numbering runs 1 through 4, and the letter suffix tells you the joint type:

Code	Position	Joint type
1G	Flat	Groove (butt) weld
2G	Horizontal	Groove (butt) weld
3G	Vertical	Groove (butt) weld
4G	Overhead	Groove (butt) weld
1F	Flat	Fillet weld
2F	Horizontal	Fillet weld
3F	Vertical	Fillet weld
4F	Overhead	Fillet weld

In plain language: 1 is flat, 2 is horizontal, 3 is vertical, 4 is overhead. G means groove, F means fillet. The same codes appear on D1.1 qualification records and on the procedure you are handed on site. The AWS electrode classification system explained by Lincoln Electric is a useful companion reference, since the electrode digits and position codes follow the same logic.

Flat Position (1G and 1F)

Flat is where everything else gets learned: the puddle sits still and you can see it. Keep the arc about 1/8 in long and aim slightly into the leading edge of the puddle, not the center, letting the arc force push molten metal forward. Aim at the center and you get a fat, dimpled bead with slag trapped in the middle; aim too far back and you undercut the toes. For a steadier arc, the all position welding rod guide helps you pick a forgiving rod.

Horizontal Position (2G and 2F)

Horizontal groove welding is close to flat, except that you watch the leading edge for undercut and keep the puddle from spilling. Horizontal fillet welding is where beginners really struggle: the joint sits at roughly 45 degrees and the molten metal wants to run downhill. Tilt the electrode about 45 degrees into the vertical leg and work slightly uphill. A small weave covers both legs; keep the width modest. Gravity then works for you, since the bead wants to run up the joint, not down it. Use the lower end of the electrode’s amperage range and expect more slag.

Vertical-Up and Vertical-Down (3G and 3F)

Vertical-up is the classic beginner nemesis. The puddle wants to fall, the arc wants to push it up, and you have seconds to correct either. Use a small electrode, typically 3/32 in E6013 or 1/8 in, and set the amperage slightly higher than you think you need, since a cold arc means a sluggish puddle that freezes before it fuses properly.

Work a vertical-up weave, the “Christmas tree” motion, moving up the joint as you weave, and watch the top of the puddle for a small keyhole where the arc digs in. That keyhole is your sign of good penetration. Overheat the puddle and it runs, undercuts the vertical toe, and leaves a teardrop.

Vertical-down is faster and lays down a flatter bead because gravity feeds the metal for you. It demands real control, and it is excluded on some low-hydrogen products. The Lincoln Electric Excalibur 7018-1 MR is not approved for vertical-down, which is exactly why the AWS A5.1 electrode specification and the product data sheet always govern. Never assume a rod’s vertical-down capability from its class number.

Overhead Position (4G and 4F)

Overhead feels the hardest and is usually the most forgiving. Gravity works with you here, since molten metal wants to fall directly onto the joint. The risk is not running but dropping metal, spattering your lap, or holding the arc so long that the electrode melts onto the work. Use the smallest practical rod, typically 3/32 in, and a lower amperage than you would run in flat. Chip slag frequently, because here it hangs rather than falling away. Keep the electrode pointing into the joint at about 45 degrees and let the arc force do the work. Experienced overhead welders say the trick is to weld more carefully and quickly than you do flat.

What the Code Requires

Positions are not just technique; they are governed. AWS D1.1 limits the prequalified single-pass fillet weld size and layer width, which is why multi-pass fillet welding is standard practice for legs over roughly 1/4 in. The 2025 edition of D1.1/D1.1M also tightens procedure documentation, requiring preheat and interpass temperatures on every WPS, with minimum preheat set by table, Annex B calculation, or a qualification test. Position choices and layer limits come from that document, not from habit.

Reading the Arc: How Amps, Voltage, and Technique Change the Weld

Good welders do not guess. They watch the puddle, listen to the arc, and read the finished bead like a sentence. The arc reports three things at once: current, arc length, and travel speed. Separate those signals and a bad bead stops being a mystery.

Heat input: the formula behind the bead

The most useful relationship in stick welding is heat input per unit length: voltage times amperage, divided by travel speed. In practical units, heat input (J/in) = (arc voltage x amps x 60) / travel speed in inches per minute. The 60 is only a conversion factor, but the point stands: travel speed is as much a heat-input variable as amperage.

A 1/8 in E7018 at 100 amps with roughly 20 volts of arc voltage gives about 10,000 J per inch at 12 inches per minute. Drag the same 100 amps at 4 inches per minute and you have pushed roughly 30,000 J into every inch of the same joint, three times as much, through the same puddle. One is a structural fillet weld, the other a crater, a distortion, or a burned-out coupon.

Too low and too high: what the extremes look like

Drop the amperage below the range for your rod and everything goes cold: the puddle shrinks, the arc wanders and sputters, and the bead comes out narrow and undersized with poor fusion to the base metal. You hear it first, a thin unsteady arc instead of the steady crackle of a healthy weld. Push the amperage too high and the opposite happens: a wide flat bead with heavy reinforcement, penetration deeper than you want, spatter flying, undercut toes, and burn-through on thin material.

Arc length is voltage in disguise

Amperage is what you set and arc length is what sets the voltage. Drag the electrode out to an inch and a half and voltage climbs into the 30s. That long arc widens the bead, flattens penetration, increases spatter, oxidizes the weld metal, and hands you a ready-made excuse for porosity. Bring it down to about 1/8 in and you get better fusion, better penetration, and a better looking bead, with the trade-off that the electrode can freeze to the work if you linger. That stick is the classic beginner failure, and here is how to break it free without wrecking the bead.

Practical rule: keep the arc short enough to hear it clearly, and let travel speed and work angle do the work instead of lifting the electrode. If you need more heat, add amps, not arc length. Why the process still earns its place in the shop is covered in our guide to the advantages of stick welding.

Symptom to cause: a troubleshooting table

Most bad beginner welds can be diagnosed in about thirty seconds. Clean the bead, read the symptom, match it to the fix.

Symptom	Likely cause	What to change
Porosity (pinholes or voids)	Wet or dirty metal, damp electrodes, long arc, wind	Clean and dry the joint, store rods in an oven, shorten the arc, screen out wind
Undercut (groove at the toe)	Amps too high, arc too long, steep work angle	Drop the amps, shorten the arc, hold the work angle near 45 degrees
Overlap (cold metal over the toe)	Travel too fast, drag angle too steep	Slow down, reduce the drag angle, hold a beat at the toe
Burn-through (hole in the plate)	Too much heat for thin stock, high amps, slow travel	Lower the amps, speed up, add a backing bar

The four things behind most porosity

Porosity is the defect beginners see most and understand least, and in stick welding it almost always comes down to four things:

• Contaminated or wet base metal, where paint, oil, rust, and moisture turn to gas in the puddle.
• Damp electrodes, whose wet coating boils off mid-arc and fills the puddle with hydrogen.
• An arc that is too long, pulling extra nitrogen and oxygen into the pool.
• Wind, since the flux coating is only a short-range shield and a breeze strips it away.

That list is built into the standard. AWS A5.1, the specification for carbon steel electrodes for SMAW, tests electrodes for soundness including moisture absorption, with a dedicated moisture test for low-hydrogen electrodes. The 2025 edition of A5.1 keeps that requirement in place, which is why low-hydrogen rods carry storage rules: keep them in a rod oven, off the bench overnight, and scrap any that feel damp. Picking the right rod for the job and position is covered in our all position welding rod guide.

Reading the weld after it cools

Once the metal is cool and the bead is chipped and brushed, judge four things: uniformity, with consistent width and height and even ripples; profile, where slight convexity of about 0.010 to 0.030 in proud of the surface is normal for SMAW, a flat or concave bead hints at low amperage, and a humped, crowned bead hints at high amperage or slow travel; clean toes with no undercut groove or overlap; and a surface with minimal spatter, no cracks, and no open porosity. Run a wire wheel over it, and a sound bead stays smooth.

Then measure instead of eyeballing. A fillet weld gauge checks leg length of a corner joint, and calipers or a weld gauge give you crown height of reinforcement. These cheap tools turn “it looked fine” into a number you can compare against a AWS D1.1 acceptance criterion.

One last habit worth building: after every pass, stop and look at the puddle and the bead you just made before you pick up the chipping hammer. Ten seconds of inspection tells you more about your amperage and travel speed than any chart.

Ten Common Beginner Mistakes (and the Fix for Each)

Almost every ugly first bead traces back to one of ten mistakes. The symptoms are unmistakable, and each one is fixable in under a minute once you can name it. Every entry below gives the symptom, the cause, and the fix, so find the one that matches your weld and go straight to the correction.

1. Wrong Polarity

Symptom: The arc strikes then sputters or pops, and the bead comes out burnt, blackened and porous with a rooster-crested shape. An E6010 may refuse to sustain at all.

Cause: Polarity was not matched to the rod. An E6010 is a direct current electrode positive (DCEP) rod, and running it on DCEN kills the deep digging arc it is designed for. An AC-only electrode fed DC behaves erratically.

Fix: Set the machine polarity before striking. For DCEP, the electrode lead goes to positive (+) and the work lead to negative (-). The AWS electrode classification breakdown shows the current type built into each classification number.

2. Wrong Rod Size for the Material

Symptom: On thin sheet, burn-through eats a hole and spatter lands everywhere. On thick plate, the bead looks narrow and shallow and you struggle to fill the joint in one pass.

Cause: A 1/8 in rod on 16 gauge sheet dumps far more heat than the material can absorb. A 3/32 in rod on 3/4 in plate takes forever and leaves a shallow, underfilled joint.

Fix: Use 1/16 in for very light gauge, 3/32 in for roughly 16 to 10 gauge, and 1/8 in for plate up to about 1/4 in. The stick welding rod chart gives diameter-to-thickness pairings, and the electrode data sheet on the box always governs the amperage range.

3. Arc Too Long

Symptom: A wide, flat, noisy bead with weak penetration, heavy spatter and a dull, oxidized surface. It looks painted on rather than fused into the plate.

Cause: The electrode was held too far off the work. Arc length sets arc voltage, and a longer arc spreads the heat, widens the puddle and oxidizes the weld metal.

Fix: Hold the arc about 1/8 in, judged by sound rather than sight. Listen for the steady crackle of a short arc. A hollow buzz means the arc is too long, and the bead tells the same story.

4. Not Removing Slag Between Passes

Symptom: Slag gets rolled into the weld and the new bead lands on top of it. You see gray streaks, rough lumps at the toe and trapped inclusions that fail inspection later.

Cause: The flux coating melts into a glassy slag layer that must be chipped and brushed off before the next pass. Weld on top of slag and you are welding dirt.

Fix: Chip the slag with a chipping hammer, then scrub the bead with a wire brush to remove the last film. Do this between every pass, even when the bead looks fine.

5. Weaving Too Wide

Symptom: A wide, flat, cold-looking bead with a ripple pattern stretching far wider than the rod, and edges sitting higher than the center.

Cause: The weave exceeded about 1.5 times the electrode diameter, spreading the puddle beyond what the arc can properly fill and fuse.

Fix: Keep the weave narrow, roughly 3/16 in side to side for a 1/8 in rod. Focus on stringer beads until one is consistent, then add a small weave.

6. Riding the Puddle Instead of Leading It

Symptom: Lack of fusion. The bead looks laid on the plate rather than melted into it, parts of it flake or peel away, and the edges are rounded with no bonding.

Cause: The arc was pushed past the puddle and you were riding the hot metal ahead of it, so the arc stopped melting base metal. Underwater and up positions make this easy to fall into.

Fix: Lead the puddle. Keep the arc slightly behind the leading edge, aiming into the puddle so arc force pushes molten metal forward. A drag technique with the electrode tilted roughly 5 to 10 degrees in the direction of travel gives this naturally.

7. Poor Ground Connection

Symptom: The arc wanders or chases, spatter increases, and the bead develops fish-mouth porosity. The arc may even refuse to start until you scrape the clamp onto a fresh spot.

Cause: The work lead was clamped to dirty, rusted, painted or loose surface, so current had to find its own path back to the machine.

Fix: Clamp directly to the workpiece near the joint, on bare clean metal, and tighten hard. On larger assemblies, clamp to the part that will not create an arc path through the workpiece itself.

8. Damp Electrodes

Symptom: Hissing or popping at the arc, a spatter-heavy bead, and pits or wormhole porosity along the weld. Low-hydrogen rods are the worst offenders.

Cause: Moisture picked up in storage. Water inside the coating turns to steam in the arc and blocks the shielding gas from protecting the molten pool.

Fix: Store rods in a rod oven or a sealed box with desiccant, and never use a rod left open for months. AWS A5.1 classifies electrodes for soundness, covering coating cracking and moisture pickup, so a rod pulled from the bottom of a damp bag may already be disqualified. Any rod that touched a wet surface goes in the trash, not the oven.

9. Holding the Arc on One Spot

Symptom: A deep crater or blowhole at the end of the bead, plus a heavily oxidized wide spot where you parked the electrode.

Cause: The arc lingered long enough to overheat the electrode, burn through the puddle and let the crater fill and cool as a void.

Fix: Keep moving. At the end of a bead, lift the electrode away so the crater fills instead of dwelling on it. Watch for a pop as the tip dips into the pool. That is the sound of a tip running too hot.

10. Ignoring Fit-Up Gap and Joint Prep

Symptom: The bead bridges the joint but the root shows gaps, cold lap or a dark seam down the middle of an otherwise decent-looking weld.

Cause: The joint was not prepared. Two cold edges were butted together with no gap, so the filler had to bridge a joint it could not fuse to. Paint, oil, rust and mill scale cause the same problem in a different way.

Fix: Clean the base metal with a wire brush, grinder and chipping hammer until you see bright metal. Leave about 1/8 in (3 mm) gap on a butt joint, bevel thick plate, and tack with the same electrode and process you plan to use.

The Fast Self-Check

Run this before and after every weld. It takes fifteen seconds and catches most of the ten mistakes above before they become habit.

1. Machine set: Amps and polarity match the rod you picked.
2. Rod: Diameter suits the plate thickness, and the rod is dry and straight.
3. Work lead: Clamped on clean metal, tight, close to the joint.
4. Joint prep: Bright metal, correct gap, tacks ground flush.
5. Arc length: About 1/8 in, judged by sound.
6. Pass cleaned: Slag chipped and bead brushed before the next pass.
7. Bead checked: Even ripples, slight convexity, clean toes, no cracks.

Troubleshooting Matrix

What you see	Likely cause	Corrective action
Popping, hissing, crater holes	Damp electrode or wet clamp point	Dry the rods, clean the clamp
Arc sputters or will not hold	Wrong polarity	Match polarity to the classification
Wide, flat, oxidized bead	Arc too long	Shorten the arc to about 1/8 in
Gray streaks, lumps in the bead	Slag not removed	Chip and brush between passes
Bead peels off, no bonding	Riding the puddle	Lead the puddle into the joint
Fish-mouth pores, wandering arc	Poor ground connection	Re-clamp on clean bare metal
Round, unfused-looking toes	Arc too long or travel too fast	Shorten arc, slow travel speed
Excessive spatter	Long arc, high amperage, damp rod	Shorten arc, drop amps, replace the rod
Burn-through on sheet	Amps too high for the thickness	Smaller rod, low end of its range

Master those ten and you have already outrun most people who have been welding for a year. If a symptom here keeps nagging at you, our guide to all-position welding rods breaks down how each rod behaves across flat, vertical and overhead work.

Beyond Carbon Steel: Stainless, Cast Iron, Galvanized Steel, and Thin Gauge

Once you leave mild steel, your consumable, heat control, and fume control all need to change. A rod that works for carbon steel can contaminate a stainless joint, create toxic fumes on galvanized steel, or burn straight through thin sheet. The basics of stick welding still hold, but they need to be applied with more restraint.

Stainless Steel

Never use carbon steel rods like E6013 or E7018 on stainless. Doing so will contaminate the weld with iron and carbon, leading to rust over time. For most general fabrication, use a low carbon stainless rod such as E308L. The “L” helps limit sensitization, which occurs if the heat-affected zone stays between 800 and 1,500 degrees Fahrenheit for too long.

It’s also important to know the standards. AWS A5.1 only covers carbon steel SMAW electrodes, while stainless falls under the A5.9 and A5.14 families. For structural stainless work, follow AWS D1.6, not D1.1.

Keep travel speed up, use stringer beads, and aim for an interpass temperature below about 300 F. Most importantly, use a dedicated stainless wire brush. Free iron left by a carbon steel brush will rust onto the surface. NIOSH identifies stainless steel fume as considerably more toxic than mild steel fume, so local exhaust ventilation is required, not optional.

Cast Iron

Cast iron’s high carbon content and lack of ductility make it prone to cracking as it cools. For repairs that must be welded, a ductile nickel-iron electrode such as E7028 or a nickel-copper rod is your best option, as they can absorb shrinkage strain better than an iron-based weld.

Preheat the casting to slow cooling, peen the weld while hot to relieve stress, and allow for a slow cool under sand or insulation. Many nickel based rods are also chosen specifically because they machine cleanly. That said, for many cracks in housings or non-pressurized parts, brazing can be far safer for the casting than welding it outright.

Galvanized Steel

The zinc coating on galvanized steel vaporizes at welding temperatures, producing zinc oxide fume. This can cause metal fume fever, a flu-like illness that can set in hours after exposure. NIOSH lists zinc among the metals that produce considerably more toxic fumes than mild steel, and OSHA 1910.252 requires adequate local exhaust for these hazards.

• Remove the coating first: Grind back past the weld area to bare steel, wire brush it, and ventilate heavily before striking an arc.
• Consider another process: MIG welding with flux-cored wire can be more practical for galvanized steel, as the shielding can limit zinc vapor exposure.
• Don’t cut corners: Stick welding galvanized steel without extraction or coating removal should be avoided.

Aluminum

Stick welding aluminum is rarely viable. Molten aluminum instantly reforms its tenacious oxide layer, which a stick electrode cannot break through for reliable fusion. Combined with its high thermal conductivity, hot cracking, and distortion, SMAW is not the right tool. AWS aluminum electrodes exist under the A5.2 family, but for sound results, use MIG or TIG. Start with how to prep aluminum correctly, then move to aluminum MIG welding or aluminum flux core welding.

Thin Gauge Material

Burn-through is the biggest threat here. Keep amperage at the low end of your rod’s range and use the smallest practical diameter. For 16 to 20 gauge, a 3/32 inch rod around 40 to 65 amps with short stringer beads is a good starting point. For 22 to 26 gauge, drop to the bottom of that range, or switch to flux-cored wire or MIG for finer control. Where possible, use T-joints over butt joints, clamp the sheet to prevent flex, and consider a copper backing strip for added protection.

Base Material	Recommended Consumable	Polarity	Key Risk	Better Alternative
Carbon steel	E6013, E7018	DCEP or ACEN	Poor prep, wet rods	Stick is ideal
Stainless steel	E308L stainless rod	DCEP (typically)	Contamination, sensitization, toxic fume	TIG for thin or cosmetic work
Cast iron	Ni-iron E7028 or Ni-Cu	DCEP	Cracking, machinability issues	Brazing or epoxy repair
Galvanized steel	Carbon rod over bare steel	DCEP	Zinc fume, metal fume fever	Flux-cored or MIG welding
Aluminum	Aluminum rod (rare)	AC	Oxide, hot cracking, distortion	MIG or TIG
Thin sheet	3/32 in rod, low amps	DCEP	Burn-through, distortion	Flux-cored or MIG

Your First 30 Days: A Practice Plan, and Where Stick Welding Leads Next

What separates a good welder from a struggling one is deliberate practice. This plan assumes three sessions a week, one to two hours each. Stretch the schedule if you weld on weekends, but keep the order.

Week 1: Flat Stringer Beads on 1/4 in Plate

Start flat on 1/4 in (6 mm) mild steel plate, where you can see everything happening. Use a 1/8 in E6013 or E7018 at roughly 110 to 130 amps and lay 6 to 10 inch stringer beads end to end, aiming for a bead about 3/8 in wide. For week one use one rod, one position, one current; an all-position rod guide shows the same rod elsewhere.

You are training arc length control, the key physical skill in stick welding. Hold the arc about 1/8 in long, listen for the sound change when you drift, and correct at once. Never inspect a bead with the arc live: chip, brush, start again. Run 20 beads per session until your hand finds a rhythm.

Week 2: Horizontal Fillet Welds on a T-Joint

Build a T-joint from two pieces of 1/4 in plate and weld it horizontally. Keep the arc on the leading edge of the puddle so arc force pushes molten metal into the corner. Tilt the electrode 45 degrees, work slightly uphill, and weave. Fillets punish hesitation: stop only at the end of a bead, and restart without stabbing. A good 1/4 in fillet has roughly 1/4 in legs; one short leg and one long leg means your work angle is drifting.

Week 3: Vertical-Up and Overhead

Set the same coupon vertical. A 3/32 in E6013 works well, with a bit more current than your instinct suggests. Watch for the keyhole forming at the top of the puddle and weave around it. Overhead is where gravity can help: molten metal wants to fall onto the joint, so your job is the rate, not holding it up. Use the smallest practical rod, a lower current, and chip slag often.

Week 4: A Small Build Project

Build something you actually want: a table frame, a gate, a bike rack. Keep the welding flat and horizontal, since those are the positions you genuinely control right now. A project forces you to deal with fit-up, tacking, joint access, heat distortion, and sequencing. Our guides to aluminum MIG welding and aluminum flux core welding cover paths stick welding is not suited for.

How to Measure Your Own Improvement

Keep a simple system:

• Keep a coupon book. Number every coupon and record rod, diameter, amperage, position, and arc length.
• Consistency beats looks. Compare against a known-good sample or an older coupon of your own. Is bead width repeatable? Is the ripple pattern even?
• Measure, do not eyeball. Calipers and a weld gauge give you real leg length and reinforcement.
• Photograph everything, same lighting and angle. Progress is invisible in the moment, obvious in the photos.

WPS, WPQ, and Why They Exist

A WPS (Welding Procedure Specification) is the recipe: filler metal, current range, joint configuration, position, preheat, cleaning method. A WPQ (Welder Performance Qualification) or PQR (Procedure Qualification Record) is the proof that a particular welder produced welds that passed the required tests.

Both matter because AWS D1.1, the structural steel code, requires them. D1.1 also sets prequalified WPS limits: maximum electrode diameter, maximum current, maximum root pass thickness, maximum fill pass thickness, maximum single-pass fillet weld size, and maximum single-pass layer width. Stay inside those limits and no separate testing is needed. D1.1/D1.1M:2025-AMD1 refines qualification requirements for procedures and welders, tightens inspection and acceptance criteria, and updates material references.

For pressure piping and boilers, ASME BPVC Section IX sets welder and procedure qualification requirements for ASME code work.

The Certification Path

AWS runs a Certified Welder Program (CWP) and WPQ tracks for recognized credentials, plus the Certified Welding Inspector (CWI), Specialist (CWS), and Engineer (CWE) for inspection and engineering roles. Structural steel work means D1.1; pressure piping, boilers, and process equipment means ASME Section IX. Many training providers and community colleges run exam-prep courses. Still weighing certification? Our piece on why SMAW still wins shows where the work is.

Where This Leads

Stick welding rewards consistency over talent. The biggest gain in your first month comes from a clean bead at a consistent arc length, one position at a time. Get that, and everything else stacks on top. Those skills transfer directly: arc control, puddle reading, filler control, heat management, and joint preparation are the same skills in MIG and TIG. Learn them on a stick machine and you will be dangerous in a good way the day you switch processes.

Frequently Asked Questions

Is stick welding harder than MIG welding?

For a complete beginner, stick welding is usually harder — you manage both current and arc length manually, and slag has to be chipped between passes. The good news is that skill transfers: most welders who master stick welding pick up MIG quickly because they already understand heat input, travel speed and joint preparation. MIG is faster and cleaner; stick wins on portability, dirty metal, and outdoor work.

What polarity should I use for stick welding?

DCEP (DC electrode positive) is correct for E6010 and E7018 and most common rods, and it gives the deepest penetration. E6011 and E6013 can run on AC, which is why they ship with most entry-level machines; running an AC electrode on DCEP will give an erratic arc and poor penetration.

What amperage do I use for a 1/8 inch stick rod?

It depends on the electrode. Manufacturer-published ranges for common 1/8 in rods run about 75–135 A (DCEP) for E6010, 65–120 A (AC) for E6011, 110–140 A (AC) for E6013, 110–155 A (AC) for E7014, 100–160 A (AC) or 90–160 A (DCEP) for E7018, and 115–175 A (AC) for E7024-1. Always check the data sheet on your specific rod and start at the low end.

How do I choose between E6013 and E7018?

Use E6013 for clean, new sheet metal and general light fabrication where a soft arc and easy slag cleanup matter. Use E7018 for structural and code-controlled work where low-hydrogen content and higher mechanical properties are required — and store it in a rod oven, because damp low-hydrogen electrodes cause hydrogen cracking.

Why is my stick weld bead porous?

The four usual causes are dirty or damp base metal, wet electrodes, an arc that is too long, and wind breaking up the shielding. Clean the joint to bright metal, check your rod storage, shorten the arc to roughly 1/8 inch, and shield the arc from drafts. Persistent porosity with clean material usually points to gas flow (from a MIG gun left open) or moisture.

Can I stick weld thin sheet metal?

Yes, but use a small diameter rod such as 3/32 in at the low end of its amperage range, and expect to need a slower travel speed and careful heat control to avoid burn-through. A flux-cored or MIG process is usually faster on very thin material because you can fine-tune the wire feed and voltage.

What helmet shade do I need for stick welding?

Shade 10 to shade 14 is the typical working range for SMAW on mild steel, with lighter shades used for very thin material and low current. An auto-darkening welding helmet with adjustable shade is the safest choice for beginners because it protects you during strike and rest without the risk of welding with the hood flipped up.

Do I really need a fume extractor for stick welding?

Yes, on any indoor or semi-enclosed work. NIOSH engineering-control data shows welding fume concentrations measured from 2 to 60 mg/m³ without local exhaust ventilation, dropping to 3 to 13 mg/m³ once ventilation was applied. Ventilate the space, position a fume extractor within a few inches of the arc, and never weld in a confined space without proper atmospheric testing and an attendant.

Can I stick weld stainless steel with the same rods I use on carbon steel?

No. Stainless steel needs a stainless or nickel-alloy electrode classified under separate AWS specifications, plus dedicated stainless brushes and grinding wheels so carbon steel does not contaminate the bead. NIOSH also flags stainless steel welding fumes as considerably more toxic than mild steel fumes, so extraction matters even more.

How thick a material can I stick weld?

There is no hard limit — a skilled welder can run SMAW on plate several inches thick with multiple passes and preheat, and code work can specify SMAW for very heavy sections. Practically, a 1/8 in rod suits thin plate up to about 1/4 in, a 5/32 in rod covers roughly 1/4 in to 1/2 in, and anything heavier calls for a 3/16 in rod plus a qualified procedure and preheat per AWS D1.1.