Question
Download Solution PDFPreheating of workpiece is essential in welding
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Preheating involves heating the base metal, either in its entirety or just the region surrounding the joint, to a specific desired temperature.
Preheating is often employed when welding cast iron, high carbon steel, or alloy steel since preheating slows down the cooling rate of that area of parent metal close to the weld itself and the weld itself and thereby prevents the formation of martensite which accounts for hardness across the weld.
The change of cracking in the heat-cooling is also minimized by preheating.
Last updated on May 28, 2025
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