【Daily Question】Utilities - Mechanical & Electrical - 20200602
Thread Content
This post was last edited by hesonchang214 on 2020-6-4 at 10:54. According to the standard “Welding Procedure Qualification for Steel Pressure Vessels”, when () occurs, it is necessary to conduct a re-qualification of the welding procedure. A. When the diameter of the welding rod increases by more than 1 mm B. When welding with root cleaning is changed to welding without root cleaning C. When welding with a backing is changed to welding without a backing D. When switching from low-hydrogen welding rods to non-low-hydrogen welding rods Answer: D
A. When the diameter of the welding rod increases by 1 mm or more