Welder qualification explained: ISO 9606-1, ASME IX and AWS D1.1 validity and prolongation
Qualified once. Valid only if you keep it.
A welder certificate is not a lifetime licence. Every standard ties it to continued welding, and ISO 9606-1 adds confirmations and revalidation. This guide explains how welder qualification works and what it takes to keep certificates valid.
What is welder qualification?
Welder qualification proves that a person can make sound welds with a given process, material, thickness and position. It is separate from procedure qualification: the PQR/WPQR proves the procedure, the welder qualification proves the person who follows the WPS.
The main standards are:
- ISO 9606-1 — qualification testing of welders for fusion welding of steels (other parts cover, for example, aluminium).
- ISO 14732 — qualification of welding operators and weld setters for mechanised and automatic welding.
- ASME Section IX — welder and welding operator performance qualification (WPQ) for pressure equipment.
- AWS D1.1 — welder qualification for structural steel welding.
The qualification test
The welder welds a test piece following a pWPS or WPS. The test piece is examined visually and then tested — depending on the standard and joint type by radiography or ultrasonic testing, bend tests, fracture tests or macro examination. Under ISO 9606-1 the test is witnessed by an examiner or examining body, who issues the certificate.
Like a procedure qualification, a welder qualification covers a range: of processes, product types (plate or pipe), joint types, material groups, filler metal types, thicknesses, diameters and positions. Under ISO 9606-1 this range is summarised in the designation on the certificate:
ISO 9606-1 135 P BW FM1 S t10 PA ss nb — process 135 (MAG), plate, butt weld, filler material group FM1, solid wire, test piece thickness 10 mm, flat position, welded from a single side without backing.
Each element determines what the welder may weld in production — which is why matching welders to WPSs by hand is so error-prone.
Validity and prolongation under ISO 9606-1
Under ISO 9606-1 the qualification starts on the date the test piece was welded. To remain valid, two things are needed:
1. Confirmation every six months
Every six months, the employer’s welding coordinator or another responsible person confirms on the certificate that the welder has been working within the range of qualification. If the welder has not welded with the process for more than six months, or there is a specific reason to question their skill, the qualification is no longer valid.
2. Revalidation
ISO 9606-1 (clause 9.3) offers the manufacturer three ways to revalidate the qualification. The chosen option is stated on the certificate at the time of issue:
| Option | Requirement | Validity |
|---|---|---|
| a) | New qualification test | Re-test every 3 years |
| b) | Two welds from the last 6 months of the validity period tested by radiography, ultrasonic testing or destructive tests, and recorded | Revalidated every 2 years |
| c) | Welder works for the same manufacturer, whose quality system meets ISO 3834-2 or ISO 3834-3; production welds verified by volumetric or destructive testing at least twice a year and documented | Valid as long as the conditions are met |
Options b) and c) depend on test records from production. Without those records the certificate cannot be prolonged and the welder has to be re-tested.
ASME IX and AWS D1.1: continuity
ASME Section IX and AWS D1.1 do not use six-monthly signatures on the certificate in the same way; they rely on continuity:
| ISO 9606-1 | ASME Section IX | AWS D1.1 | |
|---|---|---|---|
| Basic rule | Confirmation every 6 months plus revalidation option a), b) or c) | Remains valid while the welder keeps using the process | Remains in effect indefinitely while the welder keeps using the process |
| Lapses when | No welding with the process for more than 6 months, or reason to question skill | Process not used for 6 months or more, or specific reason to question ability | Process not used for 6 months, or specific reason to question ability |
| What to keep | Signed confirmations, test records for b) or c) | Continuity records per welder and process | Continuity records per welder and process |
Under all three standards, the employer carries the responsibility. Whatever the standard, the practical question is the same: can you show, for each welder and process, that the qualification was valid on the day a weld was made?
Keeping track in practice
- One record per qualification, not per welder: a welder with three processes has three validity periods.
- Plan revalidation early. For option b) the test welds must come from the last six months of the validity period — that has to be planned, not discovered.
- Log continuity. Note which welder used which process on which job; it is your evidence under ASME IX and AWS D1.1 and your basis for ISO confirmations.
- Match before you plan. Check that the welder’s range covers the WPS — process, material group, thickness, diameter and position — before assigning the job.
- Give welders proof on site. Inspectors ask for it; a current welder pass answers the question in seconds.
Do this in weldXpert
weldXpert fills complete WPQ certificates from the qualification values you enter, shows which welders are qualified for each WPS, highlights expiry dates in colour and sends several e-mail reminders in the last month before a certificate expires. A welder pass is created from the stored qualifications in two clicks.
Questions about welder qualification.
How long is an ISO 9606-1 welder certificate valid?
That depends on the revalidation option chosen by the manufacturer: re-test every 3 years (option a), revalidation every 2 years based on tested production welds (option b), or ongoing validity under an ISO 3834-2/-3 quality system with regular testing (option c). In all cases a confirmation is required every six months.
What is the six-monthly confirmation?
Every six months the welding coordinator or another responsible person of the employer confirms on the certificate that the welder has worked within the range of qualification.
What happens if a welder has not welded for six months?
Under ISO 9606-1, ASME IX and AWS D1.1 the qualification for that process lapses if it has not been used for six months (ISO: more than six months). The welder then has to be re-qualified.
What is the difference between ISO 9606-1 and ISO 14732?
ISO 9606-1 qualifies welders who hold and guide the torch or electrode manually or partly mechanised. ISO 14732 qualifies welding operators and weld setters for fully mechanised and automatic welding.
Is the welder qualification tied to the employer?
Under ISO 9606-1 the confirmations and the revalidation options b) and c) are the employer’s responsibility, and option c) is tied to the same manufacturer. When a welder changes employer, the new employer has to establish the validity.
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