What is(are) the most appropriate action(s) to prepare an in-service carbon steel piping system that has been in caustic service for welding?

Answer(s): A

Which welding process produces a fast-freezing weld pool and is generally suited for joining thin sections or root passes?

Answer(s): B

What is the "area of interest" on a weld radiograph?

The entire radiograph minus 2 in. (50.8 mm) from the edges
Only the area of contrasting density
The specific portion of a radiograph that needs to be evaluated
The portion that is less than 3t from the center of the radiograph, where t is the thickness of the weld

Answer(s): C