Scope, Normative References and Definitions of EN ISO 9606
What the standard covers
EN ISO 9606 is the qualification-testing standard for welders - it establishes that a welder can produce welds meeting a defined quality level on a specified test piece. It is a personnel qualification standard, deliberately separate from procedure qualification (EN ISO 15614) and from quality-management requirements. A welder qualification is not a WPS approval, and a WPS approval is not a welder qualification; exam questions frequently blur these.
Key definitions to hold
- Welder: a person who holds and operates the torch/electrode and makes the weld.
- Welding operator: sets up and monitors mechanised/automated equipment, may not manually weld.
- Qualification range: the envelope of essential variables within which the qualified welder may work.
- Test piece / test assembly: the joint welded for examination.
- Essential variable: a parameter that, if changed, invalidates the qualification unless requalification or extension is granted.
- Period of validity: the time the certificate remains valid, subject to confirmation.
Traps
The standard is written as a multi-part family (general requirements plus process-specific parts, e.g. steel, aluminium, titanium, copper, nickel). Questions may ask which part applies to a given base metal - the answer is the process/material-specific part, not the general part alone. Another trap: confusing qualification of welders with certification of personnel under EN ISO 14713/EN ISO 9606's certification route - the certificate is issued by an examiner or examining body, but the standard defines the test, not the certification body's accreditation.
Rule of thumb
If the question asks "what does this prove?", the answer is: the welder can make a weld of the specified quality, on that material, thickness, position and joint type, within the qualified range - nothing more.
Worked example
A welder qualified on 6 mm plate in PA with 135 (MAG) is asked to weld 10 mm plate in PA. Thickness range rules apply; if 10 mm falls outside the qualified range, a new test or an extension is needed. Do not assume "thicker = harder = unqualified" - check the actual range rule in the relevant part.