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采用实芯和药芯80%Ar+20%CO2气体保护焊对S620Q厚板桥梁钢进行焊接,研究不同焊接工艺对接头组织和力学性能的影响。结果表明:实芯焊缝的主要组织为针状铁素体(AF)+粒状贝氏体(GB),粗晶区(CGHAZ)主要组织为板条贝氏体(LB)+板条马氏体(ML)+GB;药芯焊缝为GB+少量AF,CGHAZ为ML+GB;两种工艺条件下接头均具有较高的强度,都达到了母材强度的85%以上;采用药芯焊接焊缝的硬度高于实芯焊缝;实芯焊缝中具有较高的AF,冲击值高于药芯焊缝,两者的冲击值在熔合区相差最小,药芯CGHAZ中ML+GB混合组织具有较高的韧性,其CGHAZ冲击值高于实芯。
The welding of S620Q steel plate bridges with solid core and flux core 80% Ar + 20% CO2 gas was carried out to study the effects of different welding processes on the microstructure and mechanical properties of joints. The results show that the main microstructure of solid weld is acicular ferrite (AF) + granular bainite (GB) and the main microstructure of CGHAZ is lath bainite (LB) + lath (ML) + GB; the flux cored weld is a small amount of GB + AF and CGHAZ is ML + GB; both joints have higher strength under both conditions, both of which have reached over 85% of the base metal strength; The hardness of the weld is higher than that of the solid weld. The solid weld has higher AF, the impact value is higher than the cored weld, the impact value of the two is the smallest difference in the fusion zone, ML + GB mixed in the CGHAZ Tissue with high toughness, its CGHAZ impact value higher than the solid core.