王龙权, 周海涛. 7xxx高强铝合金搅拌摩擦焊研究进展[J]. 焊接, 2023(10):47 − 54. DOI: 10.12073/j.hj.20230417001
引用本文: 王龙权, 周海涛. 7xxx高强铝合金搅拌摩擦焊研究进展[J]. 焊接, 2023(10):47 − 54. DOI: 10.12073/j.hj.20230417001
Wang Longquan, Zhou Haitao. Research progress in friction stir welding of 7xxx high strength aluminum alloys[J]. Welding & Joining, 2023(10):47 − 54. DOI: 10.12073/j.hj.20230417001
Citation: Wang Longquan, Zhou Haitao. Research progress in friction stir welding of 7xxx high strength aluminum alloys[J]. Welding & Joining, 2023(10):47 − 54. DOI: 10.12073/j.hj.20230417001

7xxx高强铝合金搅拌摩擦焊研究进展

Research progress in friction stir welding of 7xxx high strength aluminum alloys

  • 摘要: 针对7xxx高强铝合金的搅拌摩擦焊研究现状,主要从焊接缺陷、搅拌针形状的选择、接头软化、疲劳性能及耐蚀性等方面详述了7xxx高强铝合金焊接过程中存在的问题。对于7xxx高强铝合金的搅拌摩擦焊(FSW),焊接缺陷及焊缝成形质量差都会导致接头软化、疲劳寿命降低及耐蚀性变差等问题;优化FSW焊接工艺参数,减少焊接缺陷,改善焊缝成形质量,有利于降低接头软化程度、提高接头的疲劳寿命及耐蚀性;选择合适形状的搅拌针对7xxx高强铝合金进行FSW,有利于改善接头的力学性能;对FSW接头进行表面机械滚压处理和超声冲击处理,改善接头表面的应力状态,有利于改善接头的疲劳性能;对FSW接头进行适当的焊后热处理,改善接头中强化相的形态、分布状态及晶粒特征,有利于改善接头的耐蚀性。

     

    Abstract: According to research status of friction stir welding of 7xxx high strength aluminum alloy, the problems existed in welding process of 7xxx high strength aluminum alloy were described in detail from aspects of welding defects, selecting of tool profiles, softening of welded joints, fatigue property and corrosion resistance, stress and deformation. For friction stir welding (FSW) of 7xxx high strength aluminum alloy, welding defects and low formation quality of weld could lead to softening of welded joints, low fatigue life and poor corrosion resistance of welded joints. Optimizing FSW parameters, reducing welding defects and improving formation quality of weld were beneficial to reduce softening degree of welded joints, improve fatigue life and corrosion resistance of welded joints. Selecting tool pin profiles to FSW of 7xxx high strength aluminum alloy was beneficial to improve mechanical properties of welded joints. Surface mechanical rolling treatment and ultrasonic impact treatment on the surface of FSWed joints could improve stress state on the surface of welded joints, which was beneficial to improve fatigue property of welded joints. Appropriate post-welding heat treatment was carried out on FSWed joints to improve shape, distribution of strengthening phase and characteristics of grain, which was beneficial to improve corrosion resistance of welded joints.

     

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