Define interpass temperature and its role in multi-pass FCAW/MCAW.

Study for the Gas Metal Arc Welding Exam, including GMAW, FCAW, and MCAW methods. Use flashcards and multiple choice questions with hints and explanations for effective learning. Get ready for your welding certification!

Interpass temperature is the temperature of the weld area between passes in a multi-pass weld. In FCAW/MCAW, controlling this temperature matters because it directly affects how well the next pass fuses to the previous one and how the heat-affected zone develops as the weld cools. If the interpass area is too cold, the next pass may not wet and fuse properly, leading to lack of fusion and higher residual stresses when the weld cools. If it gets too hot, grain growth and embrittlement can occur in the heat-affected zone, and hydrogen from the weld metal can be trapped, increasing the risk of hydrogen cracking. Keeping the interpass temperature within the recommended range helps minimize cold cracking, reduces residual stress, and promotes better fusion of the subsequent passes. The other options describe conditions not related to the weld area or the welding process.