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Crane machine post-weld heat treatment

Nov 28, 2019
The stress-relief heat treatment of crane machines after welding is an important measure to improve welding quality. For welding equipment at relatively low temperatures (such as winter, etc.), this measure must be adopted, the flame heating is usually used.
The stress-relief heat treatment uses gas welding nozzles to repeatedly heat, the entire cross section of the crane machines should be heated as uniformly as possible, and special attention should be paid to the heating quality. The stress-relief heat treatment temperature is 620 ℃ ~ 650 ℃, and the two sides are 40mm from the center of the weld as the range of stress-relief heat treatment. After the temperature of the stress-relief heat treatment is reached, the constant temperature heating must be guaranteed for more than 20-30 minutes. The blanket is wrapped in cotton and warmed slowly until it reaches room temperature.
crane machines