Process as an Essential Variable for Welder Qualification

AWS D1.1 draws a clear line between the welding procedure specification (WPS) and the welder performance qualification (WPQ). The WPS governs what the process equipment does — arc energy, joint geometry, heat input, preheat. The WPQ governs whether the individual welder can produce a sound weld under those conditions. They share some variables but differ on others, and process is one of the most important distinctions.

Under AWS D1.1:2025 Clause 6.3, welding process is an essential variable for welder performance qualification. Each process requires a separate test. A welder who earned their qualification on shielded metal arc welding (SMAW) must retest to perform production welds with flux-cored arc welding — gas-shielded (FCAW-G), gas metal arc welding (GMAW), submerged arc welding (SAW), or gas tungsten arc welding (GTAW). There is no cross-process credit.

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

This matters because each process has distinct skill demands. SMAW requires the welder to maintain arc length by feel and manage electrode consumption rate. FCAW-G runs continuously from a wire feeder; the welder controls contact tip-to-work distance (CTWD) and gun angle rather than arc length. GMAW adds transfer mode sensitivity. SAW is largely mechanized, but operator setup and seam-tracking skill still affect weld quality. These are not equivalent tasks, and AWS D1.1 does not treat them as equivalent.

Processes Under AWS D1.1 and What Each Qualification Covers

The AWS D1.1 welding processes for WPQ purposes include:

  • SMAW (shielded metal arc welding) — stick electrode; qualification covers all electrode classifications within the F-number group tested
  • FCAW-G (flux-cored arc welding, gas-shielded) — continuous wire with external shielding gas
  • FCAW-S (flux-cored arc welding, self-shielded) — continuous wire with no external gas; FCAW-G and FCAW-S are treated as separate processes for WPQ
  • GMAW (gas metal arc welding) — solid or metal-cored wire with external shielding gas; separate from FCAW-G
  • SAW (submerged arc welding) — semi-automatic or fully automatic; qualification scope differs by mode
  • GTAW (gas tungsten arc welding) — TIG process; separate qualification

A welder who qualifies with SMAW E7018 in the 3G position (vertical) holds qualification for that process and position group. Switching to FCAW-G E71T-1 on the same joint type still requires a new WPQ test. There is no provision in AWS D1.1 that allows SMAW qualification to serve as a credit toward FCAW-G qualification, regardless of how experienced the welder is.

What Triggers a Process-Change Requalification

The most common scenarios QC managers encounter:

Scenario 1 — Switching from SMAW to FCAW-G for productivity. A fab shop that has historically used SMAW E7018 for structural groove welds decides to transition the floor to FCAW-G E71T-1M for increased deposition rate. Every welder making the switch must test with FCAW-G. The existing SMAW WPQs remain valid for SMAW work but do not extend to the new process.

Scenario 2 — A welder using FCAW-G wants to run a GTAW root pass. Some hybrid procedures call for a GTAW root pass followed by FCAW-G fill and cap. The welder needs a valid GTAW qualification for the root pass, regardless of their FCAW-G standing. See dual-process hybrid WPS for GTAW root and SMAW or FCAW fill for what the procedure side of this requires.

Scenario 3 — Project specification requires SAW, but the shop's welders are only SMAW/FCAW qualified. SAW qualification testing is straightforward — a test plate in the 1G or 2G position — but it must be done before production begins. Arriving on a project where the WPS calls for SAW with welders who have never been tested on SAW is a shutdown scenario.

Scenario 4 — A welder's FCAW-G qualification lapses while they continue to work SMAW. Under the 6-month continuity rule (AWS D1.1:2025 Clause 6.4.1), a qualification expires when the welder has not used that process within the preceding 6 months. The lapse is process-specific. A welder who runs SMAW daily but has not touched a FCAW-G gun in 7 months retains SMAW qualification; only FCAW-G has expired. Detailed continuity tracking by process is essential — see AWS D1.1 welder continuity 6-month rule for the compliance mechanics.

Qualification Test Requirements for Each Process

The WPQ test for a new process follows the same basic structure regardless of which process is being qualified:

  1. Select a WPS that covers the new process, applicable position, and base metal group.
  2. Weld a test coupon to the joint configuration required by the test position (groove or fillet, per Clause 6.2 or 6.3 test requirements).
  3. Perform mechanical tests — guided bend tests for groove welds (face and root bend, or two side bends for material ≥ 3/8 in [10 mm]); macro examination and fillet break for fillet welds.
  4. Document the results on the welder performance qualification test record, including the WPS used, heat settings observed during the test, test coupon disposition, and mechanical test results.

The test coupon thickness and joint geometry determine the range of qualification — a 3G test on 3/8 in plate qualifies the welder for all thicknesses in the vertical position with that process, within the thickness range specified in Clause 6.3. The position qualifications from AWS D1.1 do not change based on process — a 3G groove test qualifies vertical up on that process; a separate 4G test is required for overhead.

One point that catches shops off guard: the WPS used for the WPQ test must be an approved WPS for that process. You cannot test a welder on a process using a WPS that has not yet been qualified or approved. If the shop is simultaneously qualifying a new FCAW-G WPS via PQR and testing welders on it, the PQR must be completed and the WPS approved before the WPQ tests are valid.

Managing Process Qualifications in the Welder Roster

A welder on the floor may hold active qualifications for two or three processes. Tracking which qualifications are current for each process, separately, is the QC manager's responsibility. The common failure mode is treating a welder as "qualified" without specifying which process — and then assigning them to a project that requires FCAW-G based on their SMAW WPQ.

Best practices for maintaining the welder qualification matrix:

  • Record process as a separate column or field in the qualification log, not just a general "qualified" status.
  • Track the last date of production use for each process independently.
  • Flag welders whose use of any single process approaches the 5-month mark so retesting can be scheduled before the 6-month clock runs out.
  • When a welder requalifies after a lapse, update the qualification record to show the new test date for that specific process — not a blanket re-start of all qualifications.

The welder continuity tracker and qualification matrix tools in modern WPS software can automate process-level expiration tracking, which is difficult to manage reliably in a spreadsheet once the welder roster grows beyond a handful of people.

Process Qualification vs. Procedure Qualification: Keeping Them Straight

QC managers sometimes conflate WPS essential variables with WPQ essential variables. A change that triggers WPS requalification (adding a new electrode classification, changing shielding gas composition) does not automatically require WPQ requalification. And a WPQ essential variable change (new process, new position group) does not require a new WPS as long as the process was already qualified under the applicable WPS.

The table to check is different for each:

  • WPS essential variables for the process in use → Table 6.6 (and Table 6.7 for ESW/EGW, Table 6.8 for CVN supplementary)
  • WPQ essential variables → Clause 6.3 lists

See AWS D1.1 WPS vs. PQR vs. WPQ — what each document covers for a side-by-side comparison of the three document types and their respective essential variable sets.

Audit Documentation for Process-Specific Qualifications

On an AISC-certified shop audit or an owner's third-party review, the auditor will pull WPQ records and verify:

  • The process on the test record matches the process being used in production
  • The test date falls within 6 months of the last documented production use of that process (or shows a continuous use chain)
  • The WPS used for the test was approved at the time of testing

Gaps here — particularly welders performing FCAW-G production welds with only a SMAW WPQ on file — are cited as nonconformances and can halt production on the affected joints. Resolving them requires new test plates, which takes time even on a well-run shop floor.

If you are building out a qualification matrix that tracks process, position, and continuity dates per welder, the WPS generator and welder qualification module provides the documentation framework to stay audit-ready on each of these dimensions.

Key Takeaways

  • Welding process is an essential variable for WPQ under AWS D1.1:2025; each process requires a separate qualification test with no cross-process credit.
  • FCAW-G and FCAW-S are treated as separate processes; FCAW-G and GMAW are also separate.
  • The 6-month continuity lapse rule applies per process — a welder can hold valid SMAW qualification while their FCAW-G qualification expires.
  • The WPS used for a WPQ test must be an approved WPS; testing a welder simultaneously with a WPS undergoing PQR qualification is not valid.
  • Qualification records must identify the specific process; a generic "qualified" status without process detail is insufficient for audit.