15CrMo alloy plate is a Pearlite Heat-resistant Steel with high thermal strength (delta B (> 440 MPa) and oxidation resistance at high temperature, and has certain hydrogen corrosion resistance. Because of the high content of Cr, C and other alloying elements in 15CrMo alloy plate, the hardening tendency of 15CrMo alloy plate is obvious and the weldability is poor.
Therefore, the preheating temperature of 15CrMo alloy plate is selected at 150 DEG C. Oxygen-acetylene flame is used to heat the specimen. First, the temperature of the specimen surface is roughly judged with a thermometer (estimated by the change of the color of the handwriting). Finally, the temperature of the specimen surface is measured with a semiconductor point thermometer. The measuring point should be at least three points to ensure that the specimen as a whole meets the required preheating temperature.
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