The Owner (the Company) would be the "last" word on the subject.
If I'm not mistaken, the welder usually is qualified by each employer before going on the firing line. Then, the completed joints are subject to UT or RT, so every weld is a "test". If a problem is identified, the welder can be required to retest whenever there is a reason to question his skill.
Al
Vansledge,
Al is correct. API 1104 is silent except for that one point. If you question the welders ability. And the way pipe lines are run the chief inspector is boss. If you get on his/her bad side, he has just questioned your ability to make sound welds. Also, Mid stream companies here in the Houston area i.e. Kinder-Morgan, Magellan have it in their specs that a welder needs to retest after 6 months. No matter if they are welding at the time or not.