To prevent cracks in the weld seam, heat treatment of the weld is generally required after welding, and the reason for this is
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The hardness at the weld seam is HB≤200; this is because the distribution of hardness in the weld seam is more complex than that in the base material, hence stricter requirements are set for the hardness of the weld seam compared to that of the base material. Cracking often occurs in the weld area; this is due, on the one hand, to welding residual stresses, and on the other hand, to the hardening of the weld metal, the fusion zone, and the heat-affected zone. To prevent cracking, effective heat treatment after welding is essential.
Heat treatment after welding is carried out to reduce residual stress in the weld area and improve the hardened structure, thereby preventing the weld from cracking. .