The upper limit of the qualification is the highest interpasstemperature reached in the welding procedure test.
合格鉴定的上限为焊接工艺试验时达到的最高层间温度。
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In welding process, the over range of the interpasstemperature can be avoided by the control of heat treatment equipment and by the check of the far-infrared temperature instrument.
The proper interpasstemperature is required to prevent cold and hot cracking as well as the proper selection of welding filler material, to produce the proper creep resistance and toughness.