Post Bake aka Bake Out
What is Post Bake aka Bake Out?
A heat treatment process that is performed immediately following welding; after Preheat and before Post Weld Heat Treatment (PWHT). Post Bake eliminates hydrogen that may have been introduced during welding by thermal expansion on a molecular level. Heating the HAZ (Heat Affected Zone) immediately after welding allows hydrogen to diffuse out of the material before it has fully set. Thus, reducing the risk of hydrogen embrittlement, which overtime can lead to Hydrogen Assisted Cracking or Hydrogen Induced Cracking (HAC and HIC respectively).
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