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研究了焊接速度对铝/钢异种金属搅拌摩擦焊(FSW)搭接接头宏观形貌、界面层显微组织和拉剪载荷的影响。结果表明:采用铝板在上,钢板在下的搭接接头形式,搅拌针进入钢板焊接,可以获得拉剪载荷较高的焊接接头;焊接速度较低时,焊核处出现的“洋葱瓣”状结构和界面层的冶金结合对接头强度起主要作用,随着焊接速度的提高,焊核处出现了隧道式孔洞,“洋葱瓣”状结构趋于不明显,界面结合宽度减小,界面层冶金反应有减弱的趋势,从而导致了接头拉剪破坏载荷降低。
The effects of welding speed on the macroscopic morphology, microstructure and tensile load of FSW lap joints were investigated. The results show that the welded joint with high tensile load and shear load can be obtained by using the lap joint with aluminum plate on the lower plate and the stirring pin into the plate welding. When the welding speed is low, the “onion flap” The metallurgical bonding between the structure and the interface layer plays a major role in the strength of the joint. With the increase of welding speed, tunnel-like holes appear at the weld core, the in-situ “” onion structure tends to be indistinct, the bonding width decreases, The metallurgical reaction in the interface layer tends to weaken, which leads to the reduction of the joint failure load.