Which of the following factors is crucial for minimizing defects in GMAW?

Regular monitoring of interpass temperature is crucial for minimizing defects in GMAW because it directly influences the quality of the weld and the integrity of the base materials. Interpass temperature refers to the temperature of the weld area between passes in multi-pass welding. If the interpass temperature is too low, it can lead to poor fusion between passes, resulting in incomplete or weak welds and increasing the probability of defects such as cracking or lack of penetration. Conversely, if the interpass temperature is too high, it can lead to issues such as warping or changes in the metallurgical properties of the weld, which can also cause defects. Therefore, maintaining an optimal interpass temperature is vital for achieving strong, defect-free welds.

Other factors, while they may have some influence on the welding process, do not specifically address the integrity of the weld joint in the same direct manner as interpass temperature management does. Monitoring and controlling this temperature is essential to ensure proper heat input, which is key to achieving the desired mechanical properties and avoiding defects in the weld.