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通过对添加不同量锌粉的H62焊接宏观过程、微观组织和力学性能的分析,研究了Zn含量对铜合金手工自蔓延焊接Cu-Zn焊缝金属凝固组织的影响。结果表明,焊缝区为单相α,熔合区和热影响区由α相和网状β相组成;焊缝金属中的Zn来源于焊药合金剂中的Zn和母材中的Zn;随着Zn含量的增加,焊接接头的抗拉强度提高,冲击性能有所下降,硬度提高;靠近焊缝熔合区的晶粒明显大于母材处晶粒;热影响区存在较宽的过热区,使焊接接头热影响区变得薄弱。
The effect of Zn content on the solidification microstructure of Cu-Zn weld metal in SMAW was studied by analyzing the macroscopic process, microstructure and mechanical properties of H62 welding with different amount of zinc powder added. The results show that the weld zone is single-phase α, the fusion zone and the heat-affected zone consist of α phase and reticulated β phase. The Zn in the weld metal is derived from Zn in the flux alloy and Zn in the base metal. With the increase of Zn content, the tensile strength of the welded joint increases, the impact performance decreases, and the hardness increases; the grain near the weld fusion zone is obviously larger than that of the base metal; there is a wide overheated zone in the heat affected zone The HAZ of the welded joints becomes weak.