Does arc stud welding require a WPS under AWS D1.1:2025?

Yes. AWS D1.1:2025 Clause 7 requires a written procedure for arc stud welding, including base metal, stud material, equipment settings, ferrule type, and shielding gas if used. Prequalification is not available for stud welding — all procedures require qualification testing.

How many studs must be tested to qualify a stud welding procedure?

AWS D1.1:2025 requires a minimum of 10 production-representative studs tested by bend test and/or torque test for procedure qualification. Welded to test plates representing the actual base metal and configuration of the work.

What are the daily production verification requirements for stud welding under AWS D1.1?

At the start of each shift, or when any essential variable changes, AWS D1.1:2025 requires bend testing of two studs per stud size and position. The studs must be bent 30° and show no cracking in the weld or heat-affected zone.

Is stud welding position an essential variable under AWS D1.1:2025?

Yes. Flat (1F) and overhead (4F) are distinct qualification positions for stud welding. A procedure qualified in the flat position does not cover overhead application without separate qualification testing.

Stud Welding WPS Requirements: AWS D1.1 Clause 7

Arc stud welding WPS, qualification testing, and production verification requirements under AWS D1.1:2025 Clause 7. What CWIs need to document and inspect.

Where Stud Welding Lives in AWS D1.1:2025

When structural engineers specify shear connectors for composite steel beams, or when fabricators attach threaded inserts and lifting devices to structural members, they almost always mean arc stud welding. AWS D1.1:2025 addresses stud welding in a dedicated clause — Clause 7 — rather than folding it into the general WPS qualification framework of Clause 6. The separation matters: stud welding has its own essential variables, its own qualification tests, and its own daily production verification requirements that operate in parallel with the standard WPS program.

If your fab shop does both structural welding and composite deck work, you need two distinct qualification and inspection tracks, and a CWI who knows where the boundaries are.

What Counts as "Stud Welding" Under AWS D1.1

AWS D1.1:2025 Clause 7 applies to arc stud welding (ASW) of steel studs to steel base metal. This covers:

Shear studs (Nelson or equivalent) welded to steel beams through deck or direct-to-beam for composite action
Deformed bar anchors (DBA) used in lieu of shear studs in certain composite applications
Threaded studs for mechanical attachment (lifting lugs, insulation pins, equipment anchors)

It does not cover short-cycle stud welding (resistance/capacitor discharge), which is governed by separate AWS standards and rarely appears in structural fabrication.

The WPS for Stud Welding

Stud welding is not prequalified under AWS D1.1:2025 — you cannot simply pull a standard from Annex I and skip qualification. Every stud welding procedure must be documented and qualified. The written procedure (functionally a WPS) must at minimum document:

Stud material designation — typically AWS D1.1 Type B (AISI 1010-1020) or manufacturer-specified equivalent
Stud diameter and length (before welding)
Base metal specification (e.g., A992, A572 Gr. 50, A36; through-deck vs. direct-to-steel)
Ferrule type (ceramic arc shield)
Welding current and voltage range
Lift height and plunge depth (set on the gun)
Shielding gas (type and flow rate, if used — most structural stud welding is unshielded)
Position (1F flat or 4F overhead; these are separate qualifications)

The stud welding equipment settings — current, time, lift — interact closely. Small changes in one require re-verification because the metallurgical result is highly sensitive to arc duration.

Procedure Qualification Testing

AWS D1.1:2025 Clause 7 requires procedure qualification via a bend test on a minimum of 10 studs per procedure. The bend test plates must:

Use base metal matching the production specification (same A-number or equivalent group)
Replicate the production configuration — if production welds through deck, the qualification must weld through a representative deck profile
Be welded with the same equipment, same settings, and same operator technique as production

Bend test pass/fail criteria: bend the welded stud 30° using a standard bend fixture or by pressing with a portable bending tool. No cracks, fractures, or separation in the stud base, weld flash, or heat-affected zone (HAZ) of the base metal. The stud is expected to bend and remain attached — it should not detach cleanly or show porosity at the fusion zone.

If any stud fails during procedure qualification, the entire test set must be re-run after correcting the variable that caused the failure and establishing new settings. Document the failed test and the corrective action.

Rule library based on AWS D1.1:2025; verify against your governing edition — the AHJ or contract may specify 2020 or earlier.

Daily Production Verification

This is where stud welding diverges sharply from standard WPS work. AWS D1.1:2025 Clause 7 requires ongoing daily verification, not just initial qualification:

At the start of each production shift (or when any essential variable changes — new stud diameter, new deck, new base metal heat, equipment settings reset):

Weld two test studs on a separate test plate or in a non-structural area of the work piece
Bend each test stud to 30° and inspect

If both test studs pass, production may proceed. If either fails, adjust the procedure, retest, and document before welding on the structure.

This requirement catches the most common production failure mode: equipment drift. Stud welding guns develop worn contacts, cable losses, and mechanical wear over time, all of which reduce the energy delivered to the arc. A gun that performed correctly during qualification can gradually degrade while still appearing to operate. The 2-stud/shift verification is the safety net.

Inspection During Production

The CWI's role on stud welding goes beyond verifying the shift-start test. Production inspection includes:

Visual inspection of every stud: After welding, each stud must show a full 360° flash (the expelled material ring around the base). Incomplete flash — a gap or thin spot on one side — indicates that the stud was not centered in the ferrule, the base metal surface was not properly prepared, or the arc was inconsistent. Partial flash is a rejection criterion.

Ring geometry: The flash ring should be approximately uniform in height and should not show large voids or cold-lap inclusions. Significant asymmetry indicates a positioning or surface prep issue.

Stud height: Check the as-welded stud height against the specified nominal length minus standard burn-off allowance (typically 3/16 in for common shear studs). Studs short by more than the permitted tolerance indicate excess burn-off, possibly due to excessive arc time.

Repair by replacement: If a stud fails visual inspection and cannot be corrected by the standard repair methods, the stud must be removed (mechanical means, not rewelding over it) and a replacement stud welded after verifying equipment settings. AWS D1.1:2025 places repair stud locations in the same position/size category as the original for qualification purposes.

Through-Deck Stud Welding

The majority of shear stud applications in composite construction involve welding through formed steel deck — galvanized or bare. This creates additional requirements:

Deck profile must match the qualified procedure. A procedure qualified on 3-in deck does not automatically cover 2-in deck.
Galvanizing introduces zinc fumes — a health and environment consideration, not a code change, but your safety plan must address it.
Welding through two layers of deck (endlap regions) requires separate qualification from single-layer qualification.
Moisture contamination is more common in through-deck applications because the corrugations trap condensation. Base metal must be dry at the point of weld.

Essential Variables for Stud Welding

Changes that require re-qualification under AWS D1.1:2025 Clause 7:

Change in stud diameter greater than 1/8 in
Change in stud base material specification
Change in base metal specification (beyond the qualified group)
Change in position (flat to overhead, or vice versa)
Change from direct-to-steel to through-deck, or deck profile change
Change in welding current exceeding ±10% of qualified value
Change in equipment type (gun model change may require verification)

Non-essential variables (requalification not required): minor adjustments to lift height and plunge within the equipment's normal tolerance band, normal maintenance replacements.

What to Include in the QC Closeout Package

For composite beam work on a structural project with third-party inspection:

Stud welding WPS with all essential variables listed
Qualification test report — 10 studs, photographs of bent studs, notes on any retest
Equipment calibration records for the stud gun (at minimum, daily setting log)
Daily shift verification logs — date, time, equipment ID, test stud results, inspector signature
Production inspection records — by beam number, stud count, any rejections and repairs
Stud mill cert tying back to the lot used (chain of traceability from distributor CMTRs)

For a broader look at how stud welding fits into an overall welding quality plan, see Welding ITP: Inspection and Test Plan for AWS D1.1 and Weld Traveler Document for Production Traceability.

The Connection to Structural Design

Engineers call for stud shear connectors because the composite action between the steel beam and concrete deck meaningfully increases beam stiffness and strength. That calculation depends on the studs being properly fused and achieving their rated shear capacity — typically 17–19 kips for a 3/4-in diameter stud in normal-weight concrete per AISC 360.

A failed stud that was missed in production inspection, or a procedure that was never properly qualified, means that the composite action the engineer counted on may not be there. Unlike a poorly made groove weld, a shear stud failure mode is not always visible — it may manifest as unexpected deflection or vibration rather than a visible crack. This is why AWS D1.1:2025 is unusually specific about daily verification for stud welding: the inspection burden during production is the primary quality assurance mechanism.

If you're building out a WPS library that includes stud welding procedures alongside your SMAW and FCAW programs, see how the full procedure set integrates at /pricing.