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08/08/2020

I have been often asked by welders, how long does my welder's certificate last. This is the answer per ASME Section IX:
QW-322 EXPIRATION, REVOCATION, AND RENEWAL OF QUALIFICATION
QW-322.1 Continuity and Revocation of Qualification.

(a) Continuity. The performance qualification of a
welder or welding operator shall remain valid, provided no greater than 6 months have passed since the qualified
welding process was last used under the supervision and
control of the qualifying or participating organization(s) as identified in QG-106.2 and QG-106.3, respectively, by the
(1) welder using manual or semiautomatic welding,
or
(2) welding operator using machine or automatic welding

(b) Revocation. When there is a specific reason to question
the welder's or the welding operator's ability to make welds that meet the specification, the qualifications that support the welding he is doing shall be revoked. All other qualifications not questioned remain in effect.

And by AWS D1.1:
4.2.3 Period of Effectiveness
4.2.3.1 Welders and Welding Operators.
The welder’s or welding operator’s qualification as specified
in this code shall be considered as remaining in effect
indefinitely unless:
(1) the welder is not engaged in a given process of
welding for which the welder or welding operator is qualified
for a period exceeding six months, or
(2) there is some specific reason to question a
welder’s or welding operator’s ability (see 4.24.1).

Hope it is clear now. If you still do not understand, contact me.