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采用先进的六轴焊接机器人对AZ31B变形镁合金进行了焊接实验研究。利用扫描电子显微镜和电子背散射对焊接接头的微观组织形貌、硬脆性沉淀相及织构演化规律等进行了表征分析。结果表明,焊接接头可明显分为母材区、热影响区和焊接熔化区,焊接熔化区呈现出了典型的铸态枝晶组织。由于在焊接过程中焊接区发生了非平衡态凝固过程,生成了大量的β-Mg17Al12硬脆性中间相。母材区呈现出了典型的{0001}<10-10>轧制强板织构,而熔化区织构则演变为{01-11}和{11-2L}型锥面织构。
The use of advanced six-axis welding robot AZ31B deformation of magnesium alloy welding experiment. The microstructure, hard and brittle precipitates and texture evolution of welded joints were characterized by scanning electron microscopy and electron backscattering. The results show that the welded joint can be obviously divided into base metal, heat affected zone and weld zone. The weld zone shows a typical cast dendritic structure. Due to the non-equilibrium solidification process in the weld zone during the welding process, a large amount of β-Mg17Al12 hard and brittle mesophase was formed. The parent material area shows a typical {0001} <10-10> rolling texture, while the melting zone texture evolves into {01-11} and {11-2L} conical texture.