How to Determine Interpass Temperature?

Interpass temperature is usually measured about one inch from the location where the next weld pass will be initiated just before initiating the weld.

What is maximum interpass temperature?

“Interpass temperature” refers to the temperature of the material in the weld area immediately before the second and each subsequent pass of a multiple pass weld. ... However, when interpass temperatures exceed approximately 500°F (260°C), this trend is reversed.

What is preheat temperature?

Preheat is the temperature to which the surfaces to be welded together are heated, before welding commences. Interpass temperature is the temperature at which subsequent weld runs are deposited.