底部辅热镁合金搅拌摩擦焊接头的组织及性能研究  

Microstructure and Performance of Bottom Auxiliary Heat Friction Stir Welding Joint of Magnesium Alloy

作　　者：臧千昊 周金楠 朱涵文 甘元元 芦笙[1] ZANG Qianhao;ZHOU Jinnan;ZHU Hanwen;GAN Yuanyuan;LU Sheng(Provincial Laboratory of Advanced Welding Technology,Jiangsu University of Science and Techology,Zhenjiang 212003,China)

机构地区：[1]江苏科技大学先进焊接技术省级重点实验室,江苏镇江212003

出　　处：《热加工工艺》2024年第1期39-43,47,共6页Hot Working Technology

基　　金：国家自然科学基金资助项目(51375218,51205175,51675248,51775254)。

摘　　要：针对镁合金搅拌摩擦焊接头底部成形不良的问题,对4 mm厚AZ31B镁合金板进行底部辅热搅拌摩擦焊,研究了底部辅热对镁合金接头底部区域温度及组织性能的影响。结果表明:施加底部辅热后,焊缝底部散热减少,峰值温度得到提升。同时,底部辅热可以软化金属,提高材料的流动性,焊缝底部的孔洞缺陷消失,底部组织得到细化,接头的抗拉强度和伸长率得到提升。In order to solve the problem of poor bottom forming of magnesium alloy friction stir welding joints,the bottom auxiliary heat friction stir welding of 4 mm thick AZ31B magnesium alloy plate was carried out,and the effect of the bottom auxiliary heat on the temperature of the bottom zone,and the microstrcture and performance of the magnesium alloy joint was studied.The results show that when the bottom auxiliary heat is applied,the heat dissipation at the bottom of the weld is reduced,and the peak temperature is increased.At the same time,the bottom auxiliary heat can soften the metal,improve the fluidity of the material,the hole defects at the bottom of the weld disappear,the bottom structure is refined,and the tensile strength and elongation of the joint are improved.

关 键 词：搅拌摩擦焊 AZ31B镁合金 底部辅热 热循环曲线 

分 类 号：TG453.9[金属学及工艺—焊接]