What are weldments sensitive to cold cracking?
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According to JB/T4709-2000, when welding is interrupted, post-heating should be applied promptly to weldments that are sensitive to cold cracking. So, which weldments are sensitive to cold cracking? I would appreciate some advice from those who are more experienced.
Three conditions for the formation of cold cracks: welding stress, hardened microstructure, and hydrogen. Generally in the HAZ of high-carbon steel, medium-carbon steel, low-alloy or medium-alloy high-strength steel. Post-weld heat treatment is carried out to eliminate hydrogen content in the weld and prevent crack formation