Measurement of Interpass Temperature
Measurement of Interpass Temperature
(OP)
How does one measure interpass temperature? Where are the measurements made and how are they made?
Joe Tank
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Measurement of Interpass Temperature
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RE: Measurement of Interpass Temperature
RE: Measurement of Interpass Temperature
TempStik or contact pyrometer
The interpass temperature is measured in the weld region (weld metal and surrounding base metal HAZ) after each completed pass.
RE: Measurement of Interpass Temperature
I can tell you where not to measure it. Not in the weld crater as soon as you terminate the weld and not in the weld groove if you are using a temperature indicating crayon.
My standard practice, unless otherwise specified by the welding standard, is to measure the temperature one inch from the edge of the weld groove where the next weld pass will start and just before initiating the arc.
I do not use the infrared thermometers on any material other than carbon steel. Many metals such as aluminum, stainless steel, nickel alloys, etc. do not have the same emissivity as carbon steel resulting in erroneous temperature readings. In my experience I've seen errors of 150 degrees F when I double checked the temperatures with a thermocouple.
Best regards - Al
RE: Measurement of Interpass Temperature
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: Measurement of Interpass Temperature
Hg
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