Does changing the flux brand on a SAW WPS require requalification?

Yes. Under AWS D1.1:2025 Table 6.6, the flux trade name and type (fused vs. agglomerated, active vs. neutral) are essential variables for SAW. Switching flux brands or from fused to agglomerated flux requires a new PQR, even if the wire classification stays the same.

Is SAW position-qualified like other processes under AWS D1.1?

SAW is inherently limited to flat (1G/1F) and horizontal (2F) positions for most production work due to the granular flux pool. AWS D1.1 Clause 5 prequalified provisions do not include SAW in vertical or overhead positions. Any out-of-position SAW requires procedure qualification testing in that position.

What heat input change triggers SAW WPS requalification under Table 6.6?

AWS D1.1:2025 Table 6.6 lists a decrease in heat input as an essential variable for processes where CVN toughness is required (Table 6.8), and significant increases that take the procedure outside the qualified range. For non-CVN work, voltage, amperage, and travel speed are non-essential but must be documented — the qualified range is what appears on the PQR.

Can a SAW WPS qualify groove and fillet welds with a single PQR?

Yes, provided the PQR test welds cover the required material thickness ranges. A groove weld PQR qualifies fillet welds in the same material group with no upper limit on fillet size. The weld metal deposited and the base metal thickness range from the groove PQR apply per AWS D1.1:2025 Clause 6.2.

SAW Essential Variables: WPS Requirements Under AWS D1.1

Submerged arc welding essential variables for AWS D1.1:2025 procedure qualification — flux-wire combinations, heat input limits, position restrictions, and Table 6.6 triggers.

Submerged arc welding (SAW) puts more weld metal down faster than any other process used in structural steel fabrication. Plate girder web-to-flange joints, heavy column base plates, and long longitudinal seams all lean on SAW productivity. But SAW WPS qualification has quirks that catch shops off guard — particularly the flux-wire combination rule and the heat-input documentation requirements. Here is what AWS D1.1:2025 actually requires.

SAW Essential Variables: What Table 6.6 Says

AWS D1.1:2025 Table 6.6 lists essential variables for all covered processes; the SAW-specific entries are in the rightmost columns. A change to any essential variable invalidates your existing PQR and requires a new procedure qualification test. For SAW, the critical essential variables are:

Flux classification and trade name. This is the source of most SAW requalification surprises. The flux-wire combination is treated as a unit — you do not qualify a wire and separately qualify a flux. If you qualify a procedure with Lincoln Electric 880M flux and LA-71 wire, switching to ESAB OK Flux 10.61 with the same wire requires a new PQR. The flux chemistry (active vs. neutral, fused vs. agglomerated) affects dilution, bead shape, and alloying — the procedure captures this as-qualified.

Wire classification. A change in AWS A5.17 or A5.23 wire classification (e.g., from EM12K to EH14) is an essential variable. Minor lot changes within the same classification are not essential, but the wire classification, diameter, and single vs. multiple electrode configuration must match the PQR.

Number of electrodes. Single-wire SAW and tandem (two-wire) SAW procedures are separately qualified. The arc interaction in tandem SAW produces a different solidification pattern and heat distribution. Switching from single to tandem — or the reverse — requires requalification regardless of matching wire classification.

Base metal P-number or group number change. Per AWS D1.1:2025 Clause 6.3 and Table 6.6, changing the base metal from one P-number group to another (e.g., A572 Gr 50 to A514 HSLA) requires a new PQR. Within the same P-number group, the original qualification typically covers the full range.

Preheat decrease. If your PQR was run at 150°F [65°C] preheat and you want to reduce that for a thinner section, it is an essential variable change. Preheat increases within a project are not essential unless CVN requirements apply (see Table 6.8 and CVN supplementary essential variables).

Position. Flat (1G/1F) and horizontal (2F) SAW qualifications do not extend to vertical or overhead. This is rarely a problem because SAW in vertical or overhead is practically impossible with loose granular flux — but mechanized SAW on inclined welds does occasionally come up on large pressure vessels or ship sections. Those require position-specific qualification testing.

The Flux-Wire Combination: Getting It Right on the PQR

The most common SAW PQR deficiency is an incompletely documented flux-wire combination. Your PQR must record:

Flux trade name, manufacturer, and AWS classification (e.g., F7A2 per A5.17 for the combination, not just the wire grade)
Wire trade name, manufacturer, AWS classification, and diameter
Whether a single electrode or multiple electrodes were used
Whether flux recycling/recovery was used and if crushed or reconditioned flux was included

The AWS A5.17 flux classification system (F6XX, F7XX, F8XX) encodes the minimum tensile strength and CVN performance of the weld metal deposited with that combination. When you record just the wire classification on the WPS without the corresponding flux classification, you have an incomplete essential variable record — a third-party auditor will flag it.

If your project requires CVN-tested weld metal (common on fracture-critical or seismic members), the flux-wire combination selected must demonstrate the required absorbed energy at the specified temperature. That test must appear in the PQR — not just on the filler metal manufacturer's data sheet. Manufacturer data sheets are not PQRs.

Heat Input Documentation and the Table 6.6 / Table 6.8 Relationship

For non-CVN SAW work, heat input (kJ/in) is a non-essential variable under Table 6.6. You still document it on the WPS (voltage × amperage × 60 ÷ travel speed in in/min × 0.001) because it affects distortion, cooling rate, and bead shape — but a change does not require requalification by itself.

When CVN impact testing is required, Table 6.8 brings additional supplementary essential variables into play. Changes that increase heat input above the qualified value, or that change the interpass temperature ceiling, become essential. This is where SAW procedures for bridge work, seismic zones, and fracture-critical applications get more complex. The Table 6.8 supplementary essentials layer on top of Table 6.6 — they do not replace it.

For heat-input-sensitive SAW work, the practical approach is to run the PQR at the maximum anticipated heat input and minimum preheat the production WPS will use. This gives you the most conservative (worst-case) thermal cycle on the test plate, which bounds the production range conservatively.

SAW on Prequalified Joints: What's Allowed

SAW is permitted under AWS D1.1:2025 Clause 5 prequalified provisions for flat and horizontal positions only. Prequalified joint configurations for SAW include CJP groove welds with steel backing and PJP groove welds, subject to the specific joint geometry limits in Annex B. Single-pass SAW fillet welds up to 5/16 in [8 mm] are prequalified; larger single-pass SAW fillets require procedure qualification.

One frequently missed restriction: prequalified SAW CJP groove welds require a minimum preheat per Clause 5.8, even for A36 base metal, when the thickness exceeds 1.5 in [38 mm]. This is often overlooked because SMAW and GMAW preheat for the same steel only kicks in at higher thicknesses — the SAW threshold is lower due to the higher heat input concentrating stress.

For plate girders welded with SAW, check your joint design and prequalified geometry documentation before writing the WPS. Using a non-prequalified joint configuration invalidates the prequalified status and requires a PQR even if the process and position are otherwise within prequalified limits.

Practical Qualification Strategy for a SAW-Heavy Shop

If your shop runs SAW on structural projects with multiple steel grades (A36, A572 Gr 50, A992 wide flange, A588 weathering), the most efficient PQR strategy is:

Qualify on the highest-strength base metal you regularly use (A572 Gr 50 typically covers A36 in the same P-number group).
Use the flux-wire combination you intend to run exclusively on structural work. Do not mix flux brands between projects.
Run the PQR at maximum planned heat input (highest voltage-amperage setting at lowest planned travel speed).
Test at the minimum preheat you intend to use in production.
If CVN testing is required on any foreseeable project, qualify with CVN testing now — retrofitting it later requires a new PQR.

This approach gives you a single SAW PQR that covers the broadest range of production conditions without frequent requalification. A well-structured WPS library with clear revision history ensures the correct PQR stays linked to each WPS through its full service life.

Common SAW WPS Deficiencies in Audits

Based on recurring findings in third-party shop audits:

Flux trade name missing: PQR records only the AWS classification, not the manufacturer or product name. The classification alone does not identify which specific flux was tested.
Single vs. tandem not stated: WPS says "SAW" without specifying electrode configuration; production runs tandem; the PQR was single-wire.
Flux recycling not addressed: Production reuses crushed flux but the WPS does not address recycled flux conditioning or admixture ratio limits.
Position overstated: WPS claims 1G/1F/2F qualification but the PQR test plate was only flat (1G). Horizontal fillet (2F) requires its own position test.

Each of these findings results in a non-conformance that could invalidate completed production welds until a corrective PQR is added. Review your SAW WPS package against common WPS deficiencies before an audit catches them first.

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

Keep SAW WPS packages, PQRs, and flux-wire combination records organized and audit-ready with WPS Welding's Pro plan.