You'll probably get loads of responses to this "new scenario" but my opinion is that on those short, one or two day jobs, it cannot be resolved, it can only be documented as you apparently are already doing.
Depending on the job duration, the amount of welding and the number of processes being used, perhaps you could generate a little overtime by offering to assist, or guide the engineer of record in completing required pre-qualified forms. This however is just a thought.