Temperature of the deposited weld and adjacent base metal immediately before the next pass. The minimum is usually the preheat; a maximum, often around 250 to 315 °C for carbon steel and 150 to 175 °C for austenitic stainless, protects toughness, corrosion resistance and grain size. Welders measure it with temperature sticks or contact thermometers and wait or reheat as needed.
Stainless is over 350 interpass temperature, go weld the other flange and come back to this one.
Also heard as
- interpass
- interpass temp
Related terms
Preheat
Heating base metal before welding to slow cooling and drive off moisture, preventing hydrogen cracks.
Heat input
Energy delivered to a weld per unit length, calculated from amps, volts and travel speed.
HAZ
Heat-affected zone: base metal next to a weld whose structure changed from the heat but did not melt.
WPS
Welding procedure specification: the written instructions that tell welders exactly how to make a weld.