Does shear stud welding require a separate WPS from structural groove and fillet welds?

Yes. AWS D1.1 Clause 7 covers stud welding as a distinct process with its own essential variables, qualification tests, and production verification requirements. A WPS written for SMAW or GMAW structural welds does not cover stud welding.

What production tests are required for shear stud welding under AWS D1.1?

AWS D1.1 Clause 7.7 requires bend tests on the first two studs welded each day and after any equipment change. Studs are bent 30° with a hammer; a passed stud shows no base-metal fracture. Failed tests trigger immediate stop, equipment recalibration, and two consecutive passing retest studs.

Can studs be welded through deck without a separate qualification?

Through-deck (puddle) welding requires qualification testing with the actual deck profile and coating in place. A WPS qualified on bare plate does not automatically cover through-deck application — the deck type and galvanizing or paint coating must be documented as essential variables.

What essential variables trigger requalification of a shear stud WPS?

Changes to stud diameter, stud material specification, base metal P-number group, flux type or lot (where flux is used), power source type (constant current vs. constant voltage), lift and plunge settings beyond qualified range, and switching from bare plate to through-deck welding all require requalification.

Shear Stud Deck Welding WPS: AWS D1.1 Requirements

What your WPS must cover for shear stud welding on composite deck: stud welding essential variables, qualification tests, and daily production checks under AWS D1.1:2025.

Shear stud welding is everywhere in composite-beam construction, yet it trips up QC programs that treat it as a footnote to the structural WPS package. AWS D1.1:2025 dedicates an entire section — Clause 7 — to stud welding, and the requirements are meaningfully different from groove or fillet weld procedures. If your WPS binder has a single "stud welding" line item copied from the previous job, read on.

Why Stud Welding Gets Its Own WPS

The arc stud welding process (ASSP) uses a drawn arc between the stud base and the base metal, a ceramic ferrule to contain the molten puddle, and a timed plunge to form the weld. Unlike SMAW or GMAW, there is no "travel speed" to record — the weld happens in milliseconds. Essential variables therefore target the parameters the operator can control: stud geometry, power settings, lift height, plunge speed, and base-metal surface condition.

Under AWS D1.1:2025 Clause 7.2, a stud welding procedure specification must document:

Stud manufacturer, diameter, and material specification (typically AWS D1.1 Type B per Clause 7.2.5)
Base metal specification and surface condition (bare, primed, galvanized, or through-deck)
Flux type and lot number where applicable
Power source model and settings (lift, plunge, weld time, current)
Ferrule type (standard or through-deck profile)
Stud position (flat/overhead) and any preheat requirement

The WPS is not optional — Clause 7.2.1 explicitly requires an approved procedure before production stud welding begins.

Qualification Testing

A new stud welding WPS requires procedure qualification tests per Clause 7.4. At minimum, ten studs are welded to a test plate representing the production base metal and surface condition. The qualification tests include:

Bend test: Studs are bent 30° from vertical using a ring or pipe hammer. No fracture in the base metal or weld zone constitutes a pass. If the stud bends without fracture, the weld is acceptable regardless of visual appearance at the bend.

Torque test (when specified): Applied on studs welded to thin base metal (under 3/8 in [10 mm]) where bend-testing geometry is awkward. The torque value correlates to the weld size.

Macro-etch section: One stud from each qualification group is sectioned and etched to verify full-fusion penetration and absence of porosity or cracks.

For through-deck (puddle) applications, the qualification test plates must include the actual deck profile and coating — galvanized deck, painted deck, and bare deck each require their own qualification run. This is the most-cited deficiency when a third-party auditor reviews a stud welding package.

Through-Deck Welding: The Harder Case

Welding studs through composite deck introduces variables that bare-plate qualification does not cover:

Deck steel coating (bare galvanized, zinc-rich primer, shop paint)
Deck profile depth (1.5 in, 2 in, 3 in ribs change heat path)
Puddle geometry — the deck hole burns through before the base-metal arc forms

AWS D1.1:2025 Clause 7.3 requires the WPS to specify the deck gauge range, rib height, and any pre-punched or field-burned hole diameter. If you switch deck gauge mid-project, check whether your qualified WPS still covers it.

Preheat is rarely required for shear stud welding on A992 or A572 Gr 50 wide flanges, but Clause 7.2.3 mandates that when ambient temperature drops below 0°F [–18°C] or moisture is present on the base metal, surface preparation steps be documented in the WPS. Rain or snow during stud welding — even a light mist — is a mandatory stop.

Production Verification: Daily Bend Tests

One of the most operationally significant requirements is the daily production verification per Clause 7.7. Before any shear studs are permanently installed on a given day:

The first two studs are welded to a run-on test plate or a sacrificial area of the beam using the exact same equipment settings as the WPS.
Both studs are immediately bent 30°.
Both must pass — if either fails, production stops.

On failure: recalibrate equipment, weld two more test studs, and pass both before resuming. Document every test result on the daily stud welding log. This log is an audit deliverable — AISC-certified shops are inspected on its completeness.

Any time equipment is changed (different stud gun, power cable length, generator), the two-stud bend test resets. Operators sometimes overlook equipment changes mid-day; build that check into your field inspection hold points. You can see how weld inspection hold points integrate with the CWI workflow for the broader QC system.

Essential Variables That Force Requalification

Per AWS D1.1:2025 Clause 7.4.4, any of the following changes invalidates the existing WPS qualification and requires a new procedure test:

Variable	Requalification Trigger
Stud diameter	Any change
Stud material	Change in AWS material classification
Base metal	Change in P-number group or from bare to coated
Flux type/lot	Change in manufacturer or lot
Power source	CC to CV, or change in model class
Through-deck to bare plate	Either direction
Lift height setting	Change beyond ±10% of qualified value
Weld time	Change beyond ±10%

The lift and weld-time tolerances catch a common field problem: gun triggers wear and change the mechanical plunge speed over time. If studs start failing bend tests, equipment calibration history is the first place to look.

WPS Documentation Best Practices

Your stud welding WPS package should travel with the erection/fabrication records and include:

Signed WPS with all essential variables filled in (not left blank)
PQR (or supporting qualification test report) with bend test photos and macro section
Equipment calibration records for the stud guns used
Daily production bend-test log, by date, beam mark, and operator
Deck specification sheet if through-deck welding is included

When the EOR or special inspector requests a stud welding review, these four documents answer 90% of their questions immediately. Missing the daily log is the most common reason an otherwise sound WPS package fails an audit.

Digital WPS management closes this gap — centralized WPS library control ensures the correct, signed revision is on the floor, not a photocopied version from a prior project with wrong settings.

Integrating Stud Welding into Your QC Plan

The WPS is only one piece. A complete stud welding QC section in your Inspection and Test Plan (ITP) should reference:

Clause 7.2 (WPS requirements)
Clause 7.4 (procedure qualification)
Clause 7.7 (production testing)
AISC Code of Standard Practice Section 8 for shop inspection witness points

If your shop is AISC-certified or pursuing certification, the third-party auditor will ask to see at least three months of daily bend-test logs cross-referenced against the corresponding beam marks and erection sequence. Gaps are findings. Organize the logs as you go — reconstructing them from memory after the fact is the fastest way to a non-conformance.

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

Managing WPS packages across multiple projects and processes? WPS Welding's Pro plan keeps stud welding procedures, daily test logs, and qualification records in one audit-ready system.