How long is a welder qualification valid under AWS D1.1?

Indefinitely — as long as the welder uses the process at least once every six months. The qualification doesn't expire on a calendar date; it lapses per process after a 6-month gap in use, or whenever there's specific reason to question the welder's ability.

Does a lapse void all of a welder's qualifications?

No. Continuity is tracked per welding process. If a welder runs SMAW weekly but hasn't touched GTAW in seven months, only the GTAW qualification lapses. The SMAW qualification stays in effect.

What does it take to requalify after a lapse?

A single new qualification test weld in the lapsed process, witnessed and documented on a WPQ. You don't have to requalify everything — just the process that lapsed, and the new test re-establishes the qualified ranges.

What proof does an auditor want for continuity?

A continuity log showing the date the welder last used each qualified process. Many shops keep this in a spreadsheet; the risk is that nobody updates it until an audit is announced.

The AWS D1.1 6-month welder continuity rule, explained

Under AWS D1.1, a welder's qualification expires after 6 months without using a process. Here's how the continuity rule works, what it voids, and how to track it.

Most fab shops treat a Welder Performance Qualification (WPQ) as a one-time hurdle: the welder passes the test, the paperwork goes in the binder, and everyone moves on. Then a third-party auditor pulls a welder's file, asks "when did he last run this process?", and the shop realizes the qualification quietly lapsed four months ago.

That's the AWS D1.1 continuity rule, and it catches more shops than almost any other welder-qualification finding.

What the rule actually says

Under AWS D1.1:2025 (Clause 6, welder and welding operator qualification), a performance qualification remains in effect indefinitely — with two exceptions:

The welder is not engaged in the qualified process for a period exceeding six months. The qualification then expires for that process.
There is specific reason to question the welder's ability to make welds that meet the code. The qualification can be revoked regardless of the calendar.

The first one is the trap. There's no expiration date stamped on a WPQ — it's a rolling window. Every day a welder doesn't run a given process, the clock ticks toward the six-month lapse for that process only.

Rule library based on AWS D1.1:2025. Verify against your governing edition — the AHJ or contract may specify 2020 or earlier, where the qualification clauses were numbered under Clause 4.

"Using the process" — what counts

The six-month clock resets when the welder makes a production or qualification weld with the process. It does not reset because the welder was on the clock, or was in the booth, or ran a different process. The continuity is process-specific:

A welder qualified in SMAW, FCAW-G, and GTAW who only runs FCAW-G for half a year keeps FCAW-G current — and lapses SMAW and GTAW.
Bringing a lapsed process back means a fresh qualification test, witnessed and recorded on a new WPQ.

This is why a continuity log matters more than the original test certificate. The certificate proves the welder could weld the process on the test date. The log proves they've kept the qualification alive since.

Why it fails audits

Two failure modes show up over and over, and they're both documented in our common WPS deficiencies from third-party audits breakdown:

No continuity log at all. The shop can show the original WPQ but has no record of last-use dates. An auditor can't confirm currency, so the qualification is treated as unverified.
A log that's reconstructed the night before the audit. Back-filled dates don't hold up, and they put the shop's whole quality system under scrutiny — once an auditor distrusts one record, they dig into everything.

The fix is mundane: capture last-use per welder per process as it happens, not in a panic. The hard part is that nobody owns it until it's a problem.

How to track it without a shoebox

The continuity rule is a recordkeeping problem, not a welding problem. What a shop needs is:

A roster of welders with their qualified processes (and the qualified ranges — position, thickness, diameter).
A last-use date per welder per process, updated from production records.
An alert before the six-month window closes, so a soon-to-lapse welder can be scheduled on the process or re-tested deliberately — not discovered lapsed mid-project.

That last point is the difference between managing continuity and reacting to it. A 30-day warning lets a QC manager keep a welder current with a single planned weld. A lapse discovered during an audit means re-testing under pressure, possibly pulling the welder off the job.

This is exactly what a purpose-built welder qualification matrix is for — and why continuity tracking with lapse alerts is built into every WPS-Welding plan, including Solo. The math is simple: a one-man shop tracking 15 welders by memory will miss a lapse eventually. A dashboard that flags the 6-month window won't.

The bottom line

A WPQ is not a permanent credential. It's a qualification that stays alive only as long as the welder keeps using the process, tracked per process, on a rolling six-month window. Keep a real continuity log, get a warning before the window closes, and the most common welder-qualification audit finding stops being a risk.

For how welder qualification fits alongside the procedure documents themselves, see WPS vs PQR vs WPQ.