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API API-577 Exam Questions
Welding Inspection and Metallurgy (Page 8 )

Updated On: 21-Feb-2026
Page 4 of 23
PDF with 110 Questions

Which of the following can result from residual magnetism left in a partially completed weld?

  1. Excessive distortion
  2. Tendency of weld pool to be sluggish
  3. Deflection of the weld arc
  4. Solidification cracking

Answer(s): C



What is the major cause of lack of fusion in all welding processes involving carbon steel?

  1. Inadequate preheat
  2. Improper welding speed
  3. Improper heat input and improper welding technique
  4. Not using a low hydrogen electrode or improper shielding

Answer(s): C



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?

  1. Neutralize and clean the surface within 6 in. (150 mm) of weld bevels
  2. Steam out the piping system and dry
  3. Verify with pH paper that any surface liquid is "basic"
  4. Grind the surfaces near the bevel to remove contaminants

Answer(s): A



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

  1. GMAW-S
  2. GTAW
  3. GMAW
  4. FCAW

Answer(s): B



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

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

Answer(s): C






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