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What is Preheating Techniques in Welding about?

This document discusses fundamentals of preheat in welding engineering. It explains that preheat involves heating the base metal prior to welding to slow cooling rates and allow hydrogen to diffuse, reducing cracking. The key reasons for preheat are to promote ductility, allow hydrogen escape, reduce stresses, and avoid brittle fracture. When codes apply, they specify minimum preheat temperatures. When not, thickness, restraint, composition and hydrogen levels determine preheat needs. Annex XI of the AWS co

Author

Erivaldo Constant

Language

EN