论文部分内容阅读
以A102奥氏体不锈钢焊条、R307珠光体耐热钢焊条和Ni317镍基焊条为焊接材料,对15CrMo钢进行手工电弧焊焊接处理,对比分析了3种不同焊接接头的焊缝组织与碳元素分布。结果表明,A102奥氏体不锈钢焊接接头的钢结构母材侧出现了5μm的脱碳层,A102侧出现了10μm的增碳层,碳元素从钢结构母材向A102侧发生了碳迁移。在Ni317侧和钢结构母材侧都没有出现脱碳层或者增碳层,在靠近钢结构母材侧的碳元素峰值较母材有所增加但是幅度不大,Ni317镍基焊接接头中没有发现明显的碳扩散和迁移。在采用R307珠光体耐热钢焊条对钢结构进行焊接和时效热处理过程中,熔合区界面处的碳含量发生了扩散和迁移,且方向为从R307侧向钢结构母材侧移动。对比分析可见,Ni317镍基焊接接头的焊接组织较好,可作为生态钢结构的焊材。
A15 austenitic stainless steel electrode, R307 pearlite heat-resisting steel electrode and Ni317 nickel-based electrode were used as welding materials to weld 15CrMo steel by manual arc welding. The weld microstructure and carbon distribution of three kinds of welding joints were compared and analyzed. . The results show that there is a 5μm decarburized layer on the base metal side of the A102 austenitic stainless steel welded joint and a 10μm carbon layer on the A102 side. Carbon migrates from the steel base metal to the A102 side. There was no decarburized layer or carbon layer on the Ni317 side and the steel structure parent material side, and the carbon peak near the base metal side of the steel structure was increased but not much larger than that of the parent material. No Ni317 Ni-based welded joints were found Significant carbon diffusion and migration. During the welding and aging heat treatment of the steel structure with R307 pearlite heat-resisting steel electrode, the carbon content at the fusion zone interface diffused and migrated, and the direction was from the R307 side to the side of the steel structure base material. The comparative analysis shows that Ni317 nickel-based welded joints have better welding structure and can be used as welding consumables for ecological steel structures.