What is interpass temperature?

What is interpass temperature?

• A. The temperature of the weld area before starting a pass.
• B. The temperature of the weld area after welding.
• C. The temperature of the weld area between passes in a multi-pass weld.
• D. The maximum allowed electrode temperature.

Answer: (C)

Interpass temperature is the temperature of the weld area between passes in a multi-pass weld. It’s controlled because the microstructure and mechanical properties of the weld depend on how hot the joint is between each pass. If the area stays too hot, grains can grow and toughness can drop, and residual stresses can build up. If it’s too cool, you can get poor fusion between passes or cracking when the next pass is added. The welding procedure specifies a safe range, and you typically check the temperature between passes with a thermometer before laying down the next pass. This concept is different from the temperature before welding (preheat) or after welding (post-weld), and it isn’t about the electrode’s temperature.

Interpass temperature is the temperature of the weld area between passes in a multi-pass weld. It’s controlled because the microstructure and mechanical properties of the weld depend on how hot the joint is between each pass. If the area stays too hot, grains can grow and toughness can drop, and residual stresses can build up. If it’s too cool, you can get poor fusion between passes or cracking when the next pass is added. The welding procedure specifies a safe range, and you typically check the temperature between passes with a thermometer before laying down the next pass. This concept is different from the temperature before welding (preheat) or after welding (post-weld), and it isn’t about the electrode’s temperature.