Pipe Welding Procedures PDF: Free Templates & WPS Guide

Choosing the Right Pipe Welding Process and Joint for the Job

A pipe welding procedure PDF is really a record of decisions, and most of them get made long before anyone lights a torch. Which process? Which joint design? Which filler metal? Which position? Get any of them wrong and the document may look perfectly complete on the page while being useless on the pipe.

The Processes You Will Actually See on Pipe

Five processes cover nearly all pipe work in the field and the shop.

SMAW (stick electrode) is the workhorse for pipeline field welding and out-of-position structural work. It tolerates wind, dirty surfaces and awkward body positions because the electrode carries its own flux and shielding. The trade-off is slag, chipped and ground between passes, which makes SMAW a poor candidate for a root pass and a miserable proposition for out-of-position welding on small-diameter thin wall. Our piece on why SMAW still wins covers the ground.

GTAW (TIG) is the standard root-pass process for stainless and high-alloy pipe. It gives precise control of root penetration, produces no slag to clean, and leaves a cap needing little or no dress-up. It is also the process of choice for thin wall and high-quality work. The cost is time, a clean shielding gas supply and a steady hand, the same discipline seen in aerospace TIG welding, where tolerances are tighter still.

FCAW (flux-cored wire) is common in pipeline field welding because of deposition rate. Self-shielded flux core removes the gas bottle entirely, which matters on a right-of-way, and the arc is forgiving enough for out-of-position work. The risk is that FCAW runs hot, so heat input and interpass temperature need tighter control than most welders expect. Aluminum follows its own rules in aluminum flux core welding.

SAW (submerged arc) is the productivity king on large diameter and long straight runs, sometimes with twin wire heads and continuous wire feed. It is hard to argue with on a 24-inch transmission main. The arc is hidden under a flux blanket, so the puddle is hard to read, and heavy wall demands careful control of heat input and interpass.

GMAW (MIG) in short-circuit transfer is the shop default for carbon steel pipe and structural tube because it is fast, clean and easy to automate. Short circuit is not the answer out-of-position or on thick wall, where spray or pulsed transfer takes over. On aluminum the setup changes again, so read the aluminum MIG welding guide before reaching for a spool.

Joint Types, From Butt Weld to Branch Connection

Butt and groove welds account for the overwhelming majority of pipe welding work, and they are the joint that pipeline and process piping qualifications are built around. Groove geometry, root opening and root face are set by the governing code’s joint figures, and every one of those numbers ends up on the WPS form.

Socket welds are the small-bore option, typically NPS 1/2 through NPS 2 in shop piping, with socket depth and bore dimensions taken from ASME B31.3. Fit-up is everything: a socket bored too deep or too loose will suck filler metal into the bore and reduce the flow area, the classic inspection finding on socket joints. Fillet welds cover branch connections, laschets and structural attachments, where the load path is shear rather than tension. Branch welds come in set-on and set-in configurations, socket branch and olet styles, often welded through a reinforcing pad that keeps the branch load off the parent pipe.

Filler Metal Selection Logic

Start with strength: the filler metal’s yield strength should meet or exceed the base metal’s, and the AWS classification has to be recorded on the WPS along with its F-number. The A5-series specifications from the American Welding Society cover the carbon, low-alloy, stainless and nickel consumables.

Then match the service. In corrosion work, the difference between ER304L and ER316L is molybdenum, and 316L is the right answer in chloride or reducing environments where 304L will pit. Duplex stainless pipe needs a duplex filler such as E2209 or ER2209, chosen to land the weld in the target ferrite range, typically 30 to 35 percent, so the weld matches the base metal in strength, corrosion resistance and toughness. Sour service pushes you into the nickel alloys, where the selection is driven by the ASME material and code requirements rather than by the electrode shelf price.

Post-weld heat treatment is the other half of the decision. Low-alloy Cr-Mo steels often require PWHT, which changes the allowable heat input window and usually needs a separate qualified procedure. Stainless is normally not PWHT’d because of sensitization, though martensitic grades such as 9Cr and 13Cr normally are, since they need a temper to recover toughness. Duplex is generally left as-welded for the same reason stainless is.

Positions and the Geometry They Create

Six pipe positions cover the work: 1G flat, 2G horizontal, 3G vertical, 4G overhead, 5G vertical downhill and 6G at 45 degrees inclined fixed. Under ASME Section IX, position is an essential variable, so a welder qualified only in 3G vertical does not automatically cover 6G. A 6G qualification is generally accepted as covering the other positions for the same process, but the reverse is not true, and pipeline work under API 1104 expects 6G qualification coupons.

What changes at 5G and 6G is not just the letter. In 5G downhill gravity helps fill the groove and speeds the arc, so the welder can use a slower, cooler travel; uphill, the same welder fights the puddle. At 6G the joint is inclined 45 degrees and the torch sits in the plane of the pipe, so half the circumference behaves like vertical-uphill work and half like horizontal work. Rod selection and travel angle change with it, which is why the all position welding rod guide is worth keeping in the welder’s folder.

Curved pipe creates problems that flat plate never does. Run-out happens when the molten root metal drains down the lower sidewall, so you split the weld into ring runs or alternate halves to control it. Melt-through comes from too much heat on the root pass, especially with a generous root gap. Lack of sidewall fusion shows up because the curved wall means your torch angle changes continuously around the circumference unless you keep a constant angle and a constant width of the fusion zone. All of these are geometry problems, and every one of them is easier to fix in the WPS parameters than in the weld map afterwards.

Where to Get a Legitimate Pipe Welding Procedure PDF (and What to Avoid)

Search for “pipe welding procedures pdf” and you will turn up three very different kinds of file: a blank form to fill in, a real qualified procedure with its supporting PQR attached, and a scanned code someone uploaded in a hurry. Only one is worth printing. Here is where the useful files live.

Start with your own document control system

Before you download anything, ask the project document controller, the QA manager, or your supervisor. On nearly every industrial job the governing WPS already exists as an approved submittal in a submittal register or on a shared drive. It is version-controlled, tied to a specific PQR, and already signed by the client’s inspector. A submittal that cleared that review beats any template online, and it costs nothing.

Ask for three things: the approved WPS, the supporting PQR, and the welder qualification records for the crew assigned to that work. If the job is still in preconstruction, this is also the moment to submit your own WPS for approval rather than assuming the client’s document covers your scope.

Go straight to the code publishers

For the governing documents themselves, buy from the source:

• ASME publishes the BPVC (including Section IX and B31.3, B31.4, B31.8), the A5 filler metal specifications, and the B36 pipe dimension standards, plus free read-only online access through the BPVC portal. That portal is the cheapest way to read a paragraph without owning the whole book.
• API sells its standards as PDFs through the API Webstore, and posts errata and interpretations free for purchased editions. API Spec 5L, 47th edition is the current line pipe specification, and API Std 1104 21st edition is the current edition for pipeline welding qualification and acceptance.
• AWS publishes the A5 filler metal specifications and the D1 series for structural and shipbuilding work through its standards library.

These are copyrighted documents. Buying them is cheap. Pirating them is not free.

Training bodies, certification bodies and welding organizations

Technical schools, community college welding programs, IWE training courses, and certification bodies publish sample WPS forms, PQR record sheets, and welder qualification data forms that are free and genuinely usable. They are usually better designed than file-sharing finds because they follow the codes you will work to. An all position welding rod guide is a good free reference for filler metal selection and position limits.

Manufacturer and fabricator published procedures

Alloy producers, pipe mills, and specialty fabricators often publish welding recommendations for their own material: F-number groupings, preheat ranges, PWHT parameters, and sometimes a full procedure. For nickel alloys, duplex stainless, and corrosion-resistant grades, a published procedure for that alloy beats anything generic, because filler chemistry and ferrite control are grade-specific. Treat these as a starting point, not a qualified procedure, until a PQR supports them.

Open and public-sector sources

Genuinely free, legitimate engineering references still exist:

• Federal regulations. 49 CFR Part 192, Subpart G is free, current federal pipeline regulation, and it incorporates API 1104 by reference. It shows which portions are mandatory law.
• Public-domain editions. An older edition of API Std 1104 is hosted at law.resource.org. It is real and readable, and it is old. Use it for study, never as current acceptance criteria on a live job.
• Los Alamos National Laboratory publishes a free, complete ASME B31.3 Process Piping Guide as an internal engineering standard reference. It is one of the most complete free B31.3 references available.
• OSHA publishes the welding standards, including 29 CFR 1910 Subpart Q, free from government. Subpart Q still largely incorporates the 1962 consensus standards, so treat it as a safety floor rather than current best practice.
• Universities, national labs and technical institutes publish course material, and many state extension services host welding procedure templates.

What to avoid

• Scanned “free PDF” copies of copyrighted standards with no edition number and no clear source. If it does not state the edition and addenda, it cannot be cited.
• Anything where the code edition is older than the contract requires. Check the edition and addendum date every time.
• Mixing regimes. A procedure written to API 1104 cannot be used under ASME B31.3, and neither can its acceptance criteria be swapped in.
• Templates presented as qualified procedures. A WPS with no supporting PQR is an unproven document, no matter how professional it looks.
• AI-generated or crowd-sourced procedures. They contain plausible-looking parameter ranges, wrong preheat tables, and invented acceptance criteria. Never run production welds on them.

How to vet a downloaded PDF in five minutes

Filling Out Your Own Pipe Welding Procedure: A Step-by-Step Method

A pipe welding procedure looks harder to build than it really is, because a WPS is just a series of decisions written down in a fixed order. Work through the nine steps below and the finished document is one a QA inspector can accept. The hard part is knowing what every field must say before you type a single number.

Step 1: Gather the inputs before you open a form

Collect these first, and the rest of the form fills itself:

• Base metal specification and grade (ASTM A106 Grade B, API 5L X52), plus pipe schedule and wall thickness range.
• Pipe size. Give diameter and wall thickness ranges, since the qualified parameter range depends on both. A procedure qualified on 4-inch Schedule 40 does not automatically cover 12-inch Schedule 80.
• Joint design and bevel — groove type, bevel angle, root face, root opening, number of passes.
• Service conditions — design temperature and pressure, internal corrosion medium, sour service (H2S), erosion, cycling.
• Governing code — ASME B31.3, B31.8, API 1104, or whatever the client contract specifies.
• Dimension standards. ASME B36.10M covers the dimensions of wrought carbon and alloy steel pipe; B36.19M covers stainless steel pipe. Weld size limits and edge preparation follow these dimensions, not personal judgement of the pipe.

Step 2: Choose the process and filler metal

Decide SMAW, GTAW, FCAW, SAW or GMAW, then pick the filler metal and record its AWS classification and F-number. Carbon steel usually lands on E7018 (A5.1) and stainless on ER308L or ER316L (A5.9). AWS publishes the filler metal specifications through the AWS Standards office, so cite the exact specification number (A5.1, A5.5, A5.9, A5.20, A5.22) on the form. The F-number is not cosmetic: it is the essential variable that ties your WPS to the supporting PQR, and it is what stops you from swapping E7018 for E6013 without requalifying. For aluminium rather than steel the selection logic changes completely, as covered in the guide to aluminum flux core welding.

Step 3: Set the joint details from the code groove figures

Do not invent a groove. Pull it from the code’s own joint detail figure (B31.3 uses Fig. 328.5.3) and record root opening, root face, bevel angle, pass count, and whether backing or a purge is required. Auditors check those numbers first, and a blank root opening is one of the most common rejection triggers in the whole document.

Step 4: Choose positions and note the range

List the positions the procedure covers: 1G and 2G for horizontal pipe, 5G and 6G for vertical and overhead, 6GR for the restricted diameter test. The qualified position range on your PQR must match or exceed what you write here.

Step 5: Set the parameters and check heat input

Now the numbers the welder will actually live with: electrode diameter, amperage range (a sensible window, not a single set point), voltage range, travel speed, and shielding gas type and flow rate where applicable.

Heat input (kJ/mm) = (k × V × A × 60) ÷ travel speed (mm/min) ÷ 1000

where k = 0.8 for SMAW and GTAW, and k = 1.0 for SAW and FCAW. Worked example: 120 A at 24 V travelling at 150 mm/min gives roughly 15.4 kJ/mm with k = 0.8 and about 19.2 kJ/mm with k = 1.0.

Step 6: Preheat, interpass and PWHT

Take preheat and interpass temperatures from the code’s preheat table for the material and thickness, and never leave the interpass maximum blank. If the material or thickness requires post-weld heat treatment, specify the chart, temperature and soak time, plus whether cooling is controlled.

Step 7: Write the NDE requirements

State the method (RT, UT, MT, PT), the extent (for example RT 10% or 100% of butt welds), the hold point, and the acceptance criteria by citation. ASME B31.3 radiographic acceptance criteria live in Table 341.3.1; API 1104 uses its own Section 9 acceptance criteria. They are not interchangeable, so name one and cite it precisely.

Step 8: Reference the supporting PQR

Put the PQR number, qualification date and welder or test coupon reference on the WPS. Any parameter or condition outside the PQR’s qualified range is a requalification trigger, not a drafting decision, so note it explicitly as a deviation for the reviewer.

Step 9: Number, date and approve

Assign a unique WPS number, a revision number and the effective date. Add the company name, the governing code and edition, the preparer’s name and the QA approval signature. Revision control tells the inspector which version was in force on the day the joint was welded, and it separates an approved procedure from a draft someone left on the shop floor.

Qualifying It: PQR Testing, Mechanical Testing and Welder Qualification

A written procedure is just paper until somebody proves it works, and that proof is the PQR. You cut a test coupon, machine it to the exact joint design on your WPS, weld it with the same process, filler metal, position and parameter range the procedure claims, then log every setting you actually used.

The coupon is then torn apart and measured, and the results either support the ranges you wrote or they do not. If the procedure says “150 A, 22 to 26 volts” and the coupon only passes at 140 A, production is running outside a qualified window nobody sees until an inspector finds the record.

Step 1: Building the Test Coupon

The coupon is a short length of pipe, or a section of the production joint geometry, cut from the same base metal specification and grade you will weld in production. Thickness and diameter matter, because pipe joints change shape as the wall gets thicker.

• Joint design: same bevel angle, root face, root opening, pass count, and backing or purge as the WPS specifies.
• Process and filler: same SMAW, GTAW, FCAW or SAW process, same AWS classification, F-number and diameter. No substituting a “better” electrode mid-test.
• Position: if the WPS claims 6G, the coupon is welded in 6G. A vertical-up coupon qualifies nothing for overhead.
• Parameters: stay inside the ranges the WPS claims. “Improving” the settings on the coupon leaves the PQR documenting a procedure nobody proved.

Step 2: Recording What Actually Happened

Every setting gets written down as it happens: electrode diameter, amperage, voltage, travel speed, shielding gas type and flow rate, preheat temperature, interpass temperature, pass sequence, and time between passes. Preheat and interpass are usually verified with a temperature-indicating crayon or a contact thermometer. You also log the heat number and MTR for the coupon steel, the electrode lot and its specification, the welder who ran the test, and the date. That packet is the raw material for the PQR.

Step 3: Destructive Testing

Most coupons are cut apart, because looking at a weld from the outside tells you very little.

• Guided bend tests. Specimens bend around a die until the weld reaches a specified strain; a good weld opens the convex side without cracking. Root, face and fillet bends each stress the weld differently. Under ASME Section IX, bend tests plus, where required, macro examination and either a tensile or impact test form the mechanical test package.
• Macro examination. A polished, etched cross-section reveals root fusion and penetration, slag, cracks, and lack of fusion in the heat-affected zone. This catches a root pass that never melted into the wall.
• Tensile test. A machined specimen is pulled until it breaks; strength and break location confirm the weld metal is at least as strong as the base metal, as most codes require.
• Impact testing. Charpy V-notch specimens at the service temperature, required for low-temperature service, impact-tested material, and many sour or critical applications. The WPS must reference the same test temperature the PQR will document.
• Hardness testing. For sour service, the weld and heat-affected zone are checked against a limit, commonly 22 HRC maximum in carbon steel, with API 1104 and NACE MR0175 practice addressing these limits. This is where H2S-resistant cracking is controlled, and it is the number an inspector will look for.

Step 4: Nondestructive Examination

Not everything is destroyed. Radiography of the test weld is common, and API 1104 sets its radiographic acceptance criteria in Section 9 of the standard, with separate provisions for pipe-to-pipe and pipe-to-fitting welds. UT is used where permitted, and the PQR states the method and the results rather than assuming the criteria.

Qualifying the Welder

The WPS is qualified. The welder must be qualified against it, and that is a separate test with its own coupon.

For pipeline work the welder test is a 6G coupon, the pipe set at an angle so the welder fights gravity to move the puddle, the hardest combination of position and geometry on the pipe. For process piping under ASME Section IX the coupon is typically 3G, 4G or 6G depending on service, and 6GR is common for restricted-access work. A GTAW welder usually needs 6G plus a separate root pass test, since root and fill passes are treated as different qualifications.

The coupon is evaluated like the PQR coupon: guided bend tests, radiographic examination, sometimes a macro section. Pass and you have a WPQ, a welder performance qualification, often called a welder’s ticket or continuity card in the field. What it proves is narrow: that named welder, using the listed process, filler, position and parameter range, in the listed material, met code acceptance criteria on the test date. Change the position, process, F-number or material and you need a new qualification.

Continuity: Two Different Rules

• Company continuity is typically 6 months: the company has used this qualified procedure with this welder on production work within the last six months. No work, no continuity, and the procedure itself must be requalified or the PQR extended by other means. This catches a contractor whose only qualifying weld was fourteen months ago.
• Individual welder continuity is commonly 12 months: a welder who has not welded in the qualified process for a year requalifies, typically with a new coupon.

Both are ASME IX and API 1104 shop practices. When a project is ambiguous, the governing code and the contract decide, and the conservative reading wins.

What Actually Happens on Qualification Day

The QA coordinator pulls the WPS, the material and the PQR. The test pipe is cut, beveled and inspected for fit-up. The welder runs the weld with qualified consumables while a second person records settings on the traveler. The coupon cools, is radiographed, then cut into bend specimens and macro sections in a lab. Results come back, the PQR is written and signed, and the WPQ goes to the welder with an expiry date. A WPS with a qualified PQR behind it, a welder with a current WPQ, and production welds logged against both is what an auditor wants to see.

Common Mistakes, Rejected Submittals and How to Fix Them

Most procedure rejections are not judgment calls. They are paperwork and parameter problems, and both are fixable long before anyone strikes an arc. A submittal can be turned back in about ten minutes when the WPS and its supporting PQR do not line up, and every mistake below has a straightforward correction.

Eight Document Mistakes That Get Submittals Turned Back

1. No supporting PQR. The number one submittal killer. The WPS is a set of instructions; the PQR is the proof those instructions work. Without an attached, qualified PQR covering the joint, the procedure is an unproven document and the inspector will reject it on sight.
2. A PQR that does not cover production conditions. Subtler and more expensive. The PQR qualifies one position, one filler metal F-number, one process, and a range of amperage, voltage, and travel speed. A WPS calling for 6G production when the PQR was tested in 2G is not qualified for the job. The same goes for swapping E7018 for E6013, changing SMAW to GTAW, or writing a 180 amps-per-pass range when the PQR only qualified 120 to 150 A. Production outside the qualified range means requalification, not paperwork.
3. Blank fields. Root opening, maximum interpass temperature, NDE extent, and purge details are the most frequently left blank and the first fields an auditor checks. A blank root opening means the welder guesses, and guesses vary. A blank interpass maximum on high-alloy work is a direct path to interpass cracking. A blank purge specification on stainless means no defined nitrogen control on the backside of the root pass.
4. Mixed codes. Taking preheat from ASME B31.3 while qualifying to API 1104, or borrowing an acceptance criterion from one code and an examination method from another, produces a procedure that satisfies neither. Preheat tables, impact requirements, and RT acceptance criteria differ between them, and blending them is treated as an error, not a shortcut.
5. Missing or wrong revision control. Every WPS needs a number, a revision date, and a signature. An undated procedure is not a controlled document. If the PQR is revised and the WPS is not, the revision history no longer proves what was qualified.
6. Filler metal that does not match the material or service. Running an E7018 carbon steel electrode on 316L stainless does not make a stainless weld; it makes a carbon steel weld with a stainless cap and the corrosion performance of carbon steel. Fillers must also meet the base metal strength match the code requires, and an E-number alone does not establish compatibility. For stainless and nickel work, the AWS A5.x classification and the exact alloy designation both matter.
7. Stainless purge and interpass ignored. A stainless WPS with no backing purge and no interpass cap has no control over the backside of the root pass.
8. A plate template used on pipe. A template lifted from a plate procedure carries the wrong groove geometry, the wrong position list, and usually the wrong preheat logic. Pipe positions 1G through 6G and plate positions 1F through 4F are not interchangeable, and a procedure written for flat plate will not qualify a pipe welder in any out-of-position condition.

Production Defects and Where They Come From

Document errors and production defects share a root cause: the weld was made outside what was qualified. The list below is not about bad welders. It is about procedures and parameters that do not match the conditions on the joint.

• Lack of fusion and lack of penetration. The leading causes of rejected radiographs under the ASME B31.3 Table 341.3.1 acceptance criteria and the equivalent API 1104 rules. Lack of fusion comes from too little heat input, poor bead placement, or an arc held too long on SMAW so the slag rides over the sidewall. Lack of penetration comes from too few passes, or a bevel and root gap the procedure never specified properly.
• Porosity. On stainless and low-alloy GTAW the usual causes are air contamination, inadequate purge, or shielding gas flow that is too low. In SMAW the same result comes from a wet electrode, wind, or a dirty, damp work surface. Purge is a documented parameter, which is why a blank purge field matters so much.
• Undercut. The most common visual rejection in SMAW pipe welding, usually tied to excessive travel speed and an improper work angle. The arc is dragged past the toe of the joint instead of being held on the puddle.
• Cracks. Hydrogen cracking on high-strength or sour-service steels, driven by too little preheat, high restraint, and residual stress. In this category a weld that exceeds 22 HRC is rejected on hardness grounds no matter how clean the radiograph looks.
• Excessive reinforcement, cold lap, and misfire. Too much filler deposited in the cap pass gives reinforcement above the code limit. A cold lap or a root-pass misfire is a heat input error, often caused by a travel speed written into the WPS that the PQR never actually qualified.

The Corrective Path

When a rejection lands, the sequence matters. Stop welding the affected joints. Pull the WPS and the PQR side by side and compare the settings actually used against the qualified range: amperage, voltage, travel speed, preheat, interpass, position, and filler metal. Then re-inspect the joints still in place, with a re-shoot of RT or UT as the code requires, to find the full extent instead of fixing only what was flagged. Repair or cut out per the code, and if the procedure itself was the cause, requalify it before production resumes.

Putting the Procedure to Work: Documentation, Inspection, Safety and the Real Job Workflow

A qualified pipe welding procedure is worth little if it stays in a binder in the office. Its value shows in the field, where a crew turns it into records that survive inspection and end up in the client’s turnover package. This is how that chain is built, and what OSHA 29 CFR 1910 Subpart Q requires along the way.

The Paperwork Chain, Start to Finish

Every joint leaves a trail of documents. On a pipeline or process piping job, the sequence runs like this:

1. Approved WPS and supporting PQR. The instruction sheet and the test record proving it works.
2. Welder qualification record. The WPQ covering the process, position and material range for this job, plus the continuity date that keeps it valid.
3. Production weld log or traveler. Each weld with its ID number, date, WPS number, welder stamp, process and parameters used.
4. NDE report. Radiograph interpretation, UT data sheet or MT/PT results, signed by the Level II examiner, with images retained.
5. Mill test reports (MTRs). Heat numbers tying pipe and forgings back to the material certificate.
6. Weld map and isometric drawings. The line drawings showing where every weld sits in the system.
7. Turnover package. Everything above, indexed and bound for the client, with an as-built deviation list.

Traceability holds it together. If a weld fails radiography months later, you need its log entry, proof the welder’s ticket was current, the PQR, and the parameters inside the qualified range. Every link should be reachable in minutes, not hours.

Building the Weld Map

The weld map is the one page that shows the inspector what was built and what was checked. Most crews work from isometrics, so the map is the weld list with location data added.

Inspection and Test Plans: Hold and Witness Points

The ITP is a contract document, not a code requirement, and it is where the code becomes supervision. A hold point stops the work: no welds until the client’s inspector signs off on material, fit-up or completed NDE. A witness point lets work proceed unless the inspector objects within a stated period, usually 24 hours. Mixing up the two is a classic cause of shutdowns, so define both in writing before the first weld.

Matching NDE to the Weld

• RT is the reference method for full-penetration butt welds. API 1104 typically calls for radiography of 100 percent of butt welds made in the trench, while ASME B31.3 uses a percentage approach, often 10 percent random.
• UT is used where radiography is impractical and is far more sensitive to planar defects like lack of fusion and cracks. Where the code permits, UT may substitute for RT.
• MT works only on ferrous materials, finding surface and near-surface defects.
• PT covers surface-breaking defects in stainless and non-ferrous work that MT cannot reach.

Federal pipeline rules in 49 CFR 192 Subpart G make API 1104 the welding standard for jurisdictional lines, so acceptance criteria in your WPS and your NDE report must agree with the same rulebook.

Where the Industry Is Heading

Automated and encoded UT, phased-array UT especially, keeps expanding on new pipeline construction because it delivers repeatable coverage with digital data attached to each weld. More shops now run barcode-tagged travelers feeding cloud-based weld data systems, so a joint’s record comes off a tablet instead of a filing cabinet. The document still exists, it just moves faster.

Safety: The Subpart Q Essentials

1910.252 covers general welding and cutting requirements. Screens protect nearby personnel from arc radiation and fire. Hot work on used drums, barrels, tanks or containers is prohibited until they have been cleaned and gases tested, the rule that catches crews welding on an unverified fuel drum. Local exhaust ventilation is required where general ventilation is inadequate, with a minimum of 100 cubic feet per minute per welder for general welding and 40 cfm per welder for stainless welding. Fire watches are required where a fire hazard exists and must be maintained at least an hour after the last arc is struck, so schedule it, do not assume it.

1910.253 governs oxy-fuel gas welding and cutting, including acetylene cylinder limits and the 30 psia (206 kPa absolute) ceiling on acetylene in confined spaces. 1910.254 covers arc welding equipment and the electrode holder, which must be insulated and free of exposed ungrounded metal parts. OSHA’s fume limits include 5 mg/m³ for total welding fumes, 10 mg/m³ for iron fume, a 3 mg/m³ ceiling for manganese fume and a 5 µg/m³ ceiling for hexavalent chromium, the last of which matters for stainless and chrome-bearing alloys.

Tools That Help, and Their Limits

Three things reduce paperwork friction: a rugged tablet with an offline PDF viewer that opens signed scans without a signal, a weatherproof binder that survives the truck, and a welding calculator app for amperage, travel speed and heat input. Treat them as assistants, not authorities. An app can compute 15.4 kJ/mm in seconds, but it cannot tell you whether the WPS you are reading was qualified for that heat input, and glare, heat and drops end more field tablets than software does. If your procedure calls for SMAW, the consumable handling details in this all-position welding rod guide are worth reading, and electrode storage and selection is covered in alloy steel welding electrodes: selection, use and safety. For shielding gas and cylinder handling, the Airgas welding equipment guide is a useful companion to the OSHA requirements above. Disclosure: weldgallery.com may earn a commission on some links in this section, with no added cost to you.

Frequently Asked Questions

What does a pipe welding procedure PDF need to include?

At minimum: the governing code and edition, base metal specification and thickness range, joint design (bevel angle, root opening, root face, number of passes, backing), filler metal classification and specification, welding positions, process parameters (electrode diameter, amperage, voltage, travel speed, gas), preheat and interpass temperatures, any PWHT requirements, cleaning method, NDE method and extent, and acceptance criteria. It must also reference the supporting PQR that qualified it.

Is there a free, legitimate WPS template I can download and use?

Blank templates and field-ready forms circulate widely, but a template is not a qualified procedure until a supporting PQR exists and a code-compliant welder qualification is in place. For authoritative content, read the codes directly through the publishers — ASME offers free online access to BPVC text, API sells Std 1104 and Spec 5L with free errata, and OSHA’s welding standards are free government publications.

What is the difference between a WPS, a PQR and a WPQ?

The WPS is the written instruction telling how to weld the joint. The PQR is the test-coupon record proving that the procedure produced code-compliant welds. The WPQ (welder performance qualification) proves that a specific welder can execute that procedure in the qualified positions. All three have to line up before production welding begins.

Which code should my pipe welding procedure follow?

It depends on the service: ASME B31.3 for process piping, B31.8 for liquid pipelines, B31.4 for industrial gas pipelines, API 1104 for oil-and-gas transmission pipelines built to API 5L, and ISO 15614-1 in Europe. Qualification of the procedure itself is governed by ASME Section IX for ASME codes. Never mix acceptance criteria or preheat rules between API 1104 and B31.3.

Can I reuse a pipe welding procedure from a previous job?

Only if the code, base material, filler metal, process, joint design, position range and thickness range all fall inside what the supporting PQR qualified. Changing from E7018 to E6013, or from GTAW to SMAW, moves an essential variable and normally requires requalification. Always compare against the PQR, not against what the shop did last year.

What is a 6G qualification and why is it used so much on pipe?

6G is the 45-degree inclined pipe position with the pipe axis fixed and the welder’s torch restricted to keep the arc aimed roughly perpendicular to the joint. It is the most restrictive common pipe position, so passing it generally covers the flat, horizontal, vertical and overhead positions in that procedure. API 1104 pipeline qualification typically uses a 6G coupon.

What are the most common reasons a pipe welding procedure gets rejected in review?

The big ones: no supporting PQR attached, parameters outside the PQR’s qualified range, missing fields such as root opening, interpass temperature and NDE extent, mixing code requirements between API 1104 and ASME B31.3, and unsigned or un-revisioned documents. Filler metal that does not match the base material or service is another frequent rejection.

How long is a welder qualification valid?

Common practice under ASME IX and API 1104 is six months of company continuity for a welder working under a company program, with individual welder qualifications commonly valid for 12 months. If a welder stops welding the qualified process, or the continuity period lapses, requalification by test is required before production work resumes.

What safety rules apply when welding pipe?

OSHA 29 CFR 1910 Subpart Q governs: fire prevention and hot work permits, a fire watch where there is a fire hazard, screens for arc radiation, cleaning of containers before hot work, local exhaust ventilation (100 cfm per welder for general welding, 40 cfm for stainless), and cylinder storage rules for oxy-fuel work. Note that Subpart Q still largely reflects 1962 consensus standards, so newer OSHA and NIOSH guidance is worth following too.

Where can I find the actual code documents legally?

Go straight to the publishers: asme.org for BPVC Section IX and the B31 series, api.org for Standard 1104 and Specification 5L, and aws.org for the A5 filler metal and D1 welding codes. Federal pipeline rules incorporating API 1104 are published free on eCFR, OSHA’s welding standards are free on osha.gov, and Los Alamos National Laboratory publishes a free ASME B31.3 Process Piping Guide for engineering reference.