6.2.3.1A welder’s qualification lapsed. Who noticed first?
A welder qualification matrix lists every welder against each process, position and thickness range they hold, with the date each qualification was last kept in effect by production welding. It exists to show a lapse before it happens, so the quality manager notices before the inspector does.
What one row of the matrix holds
One row is one welder and one process. The columns are the facts needed to answer a single question: can this person weld this joint today?
| Column | Why it is there |
|---|---|
| Welder ID or stencil | Ties the row to the marks on the work and to the weld log. |
| Process | The period of effectiveness runs separately for each process. |
| Positions qualified | The production position has to fall inside what the test qualified. |
| Thickness and diameter range | The test coupon limits what production work the qualification covers. |
| Qualification record reference | Points to the test record that proves the rest of the row. |
| Last production use of the process | The date that keeps the qualification in effect. |
| Six-month review date | Flag the qualification when non-use of that process exceeds six months. |
The rule the matrix enforces
AWS D1.1:2025 6.2.3.1 says a welder’s or welding operator’s qualification shall be considered as remaining in effect indefinitely unless:
- the welder is not engaged in a given process of welding for which they are qualified for a period exceeding six months, or
- there is some specific reason to question the welder’s ability (see
6.25.1).
The first condition is a date and a matrix can compute it. The second is a judgement and a matrix can only record it: a failed weld, a rejected repair, or an inspector’s concern belongs on the row with the date it was raised. Under 6.3.3, qualification test records are kept by the manufacturer or Contractor and made available to those authorized to examine them. For the ASME IX side and how to keep the underlying log, see the welder continuity log guide.
Matrix or continuity log?
The two are often confused. A continuity log is the evidence: dated entries showing each welder used each process. A qualification matrix is the decision tool built on that evidence: it combines continuity with position and range limits, so a supervisor can see who is allowed on a joint. A shop can have a perfect log and still assign a welder to a thickness their test never covered.
Why lapses surface at the audit
Most matrices are spreadsheets reviewed on a calendar, not checked at the moment a welder is assigned. The review is only as frequent as the person doing it.
“At the beginning of each month I go through it and highlight which guys are coming up this month, print it out, and check it periodically to see who’s due day to day.”
Shop QC, about 75 welders, writing on the AWS forum
History is the other gap. A qualification test from years ago is easy to find; the proof that it was kept in effect since then often is not.
“I can look back and find a welder qual for FCAW from 1999... EXCEPT there is no record or log or way to back up a continuation.”
Shop CWI, writing on the AWS forum
Checks a matrix should run for you
- At assignment: process, position and thickness range against the WPS for the joint, before the arc is struck.
- Ahead of the six-month review date: a warning early enough to schedule production work in that process, or a requalification test.
- On silent rows: a qualification with no recorded use since the test is a lapse waiting to be found.
- On cause: any recorded reason to question ability flags the row regardless of dates.
- Backwards: every weld in the log made by a welder whose row had already lapsed on that date.
How Clause5 handles it
The Clause5 qualification matrix tracks continuity and alerts before the six-month window closes, per D1.1 Clause 6.2.3.1. Continuity comes from the same weld records that feed heat-to-joint traceability and the turnover package, so nobody retypes it. During the private beta, invited shops get Professional scope at no charge as each workflow becomes available.
For reference only. Verify against the governing code edition and your employer's qualification records before assigning welders.
Clause5 is WPS software for fabrication shops: welding documentation with every value cited to the governing clause. The name comes from AWS D1.1 Clause 5, the prequalification section of the structural welding code, and the software is not that section of the code.
Frequently Asked Questions
A welder qualification matrix is a table of welders against the processes, positions and thickness or diameter ranges each one is qualified for, with a reference to the qualification record and the date each qualification was last kept in effect by production welding. Supervisors use it to decide who may weld a given joint. Quality managers use it to see lapses coming and to answer an auditor's question about any welder on the spot. It differs from a plain list of certificates because it combines the limits set by each qualification test with the continuity evidence from production, so every row answers the same question: is this person allowed to make this weld today?
AWS D1.1:2025 clause 6.2.3.1 treats a welder or welding operator qualification as remaining in effect indefinitely unless one of two things happens. The first is that the welder is not engaged in a given process of welding for which they are qualified for a period exceeding six months. The second is that there is some specific reason to question the welder's or welding operator's ability, which the code addresses in clause 6.25.1. The clause does not impose a fixed calendar expiry independent of process use and the ability condition. It stays valid for as long as the welder keeps using the process and nothing calls their ability into question, which is why continuity evidence matters as much as the original test.
Yes. AWS D1.1:2025 clause 6.2.3.1 ties the six-month condition to a given process of welding for which the welder is qualified. A welder who uses one process every day can still lose qualification in another process they have not used for more than six months. A matrix therefore needs a separate last-use date for each process a welder holds, taken from production records such as weld logs or job travelers rather than from memory. Shops that record only a single last-worked date per welder tend to discover the gap when an auditor asks for evidence of a specific process that the welder was assigned to but has not run in months.
A continuity log is the record of evidence: dated entries showing that a welder used a particular process in production, usually tied to a job or work order. A qualification matrix is the decision tool built on top of that evidence. It combines continuity with the position and thickness or diameter limits from each qualification test, and with any recorded reason to question a welder's ability, to show who is currently allowed to weld which joints. A shop can keep a complete continuity log and still assign a welder to a position or thickness that their test never covered, because the log alone does not compare the assignment against those limits.
Qualification rules from AWS D1.1/D1.1M:2025. Not affiliated with AWS.