Postweld heat treatment at different annealing temperature for different heat holding time of the welding joint of L245NCS microalloy steel was conducted by caterpillar electric heating.The welding residual stress was measured by the Mathar's method.The results show that the welding residual stress of welding joint is obviously relieved about 50% and 80%,when annealed at 560 ℃ for 3.0 h or at 620 ℃ for 1.5 h,respectively.It shows that to extend holding time can not effectively eliminate the welding residual...
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