Interpass temperature is the temperature at which subsequent weld runs are deposited. Procedures can specify a maximum interpass temperature, which is done to control weld metal microstructural development, and also ensures that the weld is similar to the welds made in the procedure qualification.

How is interpass temperature measured in welding?

Accepted method of controlling the interpass temperature is to use two temperature indicating crayons. A surface applied temperature indicating crayon (often referred to by the trade name Tempilstik) melts when the material to which it is applied reaches the crayon's melting temperature.

What is the minimum interpass temperature in welding?

However, when interpass temperatures exceed approximately 500°F (260°C), this trend is reversed. For example, the American Welding Society (AWS) Position Statement on the Northridge Earthquake recommends that the inter- pass temperature should not exceed 550°F (290°C) when notch toughness is a requirement.