What is the importance of Preheating and Interpass Temperatures? (R)

What is the importance of Preheating and Interpass Temperatures?

To obtain a crack-free weld metal, the preheating temperature is most important, as is the inter-pass temperature.

Preheating reduces:
• the risk of hydrogen cracking
• the shrinkage stress
• the hardness in the heat-affected zone (HAZ)

The need for preheating increases with the following factors
• the carbon content of the base material
• the alloy content of the base material
• the size of the workpiece
• the initial temperature
• the welding speed
• the diameter of the consumable

👉   Introduction to Welding Process

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