How can the risk of hydrogen-induced cracking be mitigated in welding procedures?

Controlling the interpass temperature is crucial in mitigating the risk of hydrogen-induced cracking during welding procedures. This process involves monitoring and maintaining the temperature between passes of welding to ensure that the heat-affected zone does not cool too rapidly. High levels of hydrogen can accumulate in the weld area, and when the temperature is not controlled correctly, the cooling rate can lead to the formation of brittle microstructures in which hydrogen can cause cracking. By maintaining an appropriate interpass temperature, the weld metal and heat-affected zone can be kept in a safer thermal condition, allowing for the diffusion of hydrogen away from the weld pool and minimizing the risk of cracking.

In contrast, choices involving increased welding speed, lower strength filler metals, or using thicker base materials may not effectively control the amount of hydrogen present or limit its potential to cause cracking. While these options may influence other factors in the welding process, controlling interpass temperature directly addresses the key issue of hydrogen management in the welding procedure.