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铝合金搅拌摩擦焊已应用于多个工业领域。搅拌摩擦焊的焊接接头须具有优异的弹塑性及与基体金属相似的变形性能。在本研究中,将双面搅拌摩擦焊与传统的单面板进行对比。采用具有不同搅拌针长度(搅拌针长度为合金板厚度的50%~95%)的可调节工具对合金板材进行双面搅拌摩擦焊。研究焊接接头的宏观、微观形貌,强度和硬度以确定搅拌针的最佳插入深度。结果表明,当搅拌针长度为合金板厚度的65%时,双面搅拌摩擦焊焊接接头的极限抗拉强度比单面搅拌摩擦焊接接头的极限抗拉强度提高了41%。
Aluminum alloy friction stir welding has been used in many industrial fields. Friction stir welded joints shall have excellent elasto-plasticity and similar deformability to the base metal. In this study, two-sided friction stir welding was compared to conventional single-sided panels. Double-sided friction stir welding was performed on the alloy sheets using adjustable tools with different pin lengths (50-50% of the pin length is the alloy plate thickness). Studying the macro, micro-morphology, strength and hardness of the welded joints to determine the optimal insertion depth of the pin. The results show that the ultimate tensile strength of the double-side friction stir welded joints is 41% higher than that of the single-side friction stir welded joints when the length of the needles is 65% of the thickness of the alloy plate.