Welding method for preventing generation of granular ferrite in SA335-T/P92 steel weld heat affected zone

The invention relates to a melding method for preventing the generation of granular ferrite in an SA335-T/P92 steel weld heat affected zone. The method comprises the following steps: (a) fabricating a groove between to-be-welded SA335-T/P92 steel end faces or between the to-be-welded SA335-T/P92 steel end faces and dissimilar steel, (b) performing non-preheating argon arc welding on a root bottom layer, and then performing welding layer by layer until a seam is formed, wherein the welding current is 130-160A, the arc voltage is 15-17V, and the interlayer temperature is 150-200 DEG C; and performing heat treatment after cooling. Therefore, the granular ferrite is not generated in the T/P92 steel weld heat affected zone; and moreover, the tissues can be improved, the plasticity of the seam is improved, the oxygen can escape, the residual welding stress is eliminated, the stress corrosion susceptibility is reduced, and the heat affected zone is softened. 本发明涉及种防止SA335-T/P92钢焊缝热影响区块状铁素体产生的焊接方法，它包括以下步骤：（a）在待焊接SA33