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李国伟, 韩永全, 陈芙蓉, 李阳. 7075铝合金变极性等离子弧焊接头组织与性能[J]. 焊接学报, 2015, 36(10): 5-8.
引用本文: 李国伟, 韩永全, 陈芙蓉, 李阳. 7075铝合金变极性等离子弧焊接头组织与性能[J]. 焊接学报, 2015, 36(10): 5-8.
LI Guowei, HAN Yongquan, CHEN Furong, LI Yang. Microstructure and mechanical properties of VPPA welded 7075 aluminum alloy joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(10): 5-8.
Citation: LI Guowei, HAN Yongquan, CHEN Furong, LI Yang. Microstructure and mechanical properties of VPPA welded 7075 aluminum alloy joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(10): 5-8.

7075铝合金变极性等离子弧焊接头组织与性能

Microstructure and mechanical properties of VPPA welded 7075 aluminum alloy joint

  • 摘要: 采用ER5183焊丝对厚度10 mm的7075铝合金进行变极性等离子弧焊,利用光学显微镜、扫描电子显微镜、X射线衍射仪、万能拉伸试验机和显微硬度仪对焊缝的显微组织和焊接接头的力学性能进行了分析和测试. 结果表明,7075铝合金变极性等离子弧焊接头成形良好,无明显的熔合区;热影响区的组织粗大,焊缝处和热影响区的硬度分别为120.9和125.9;焊缝处的抗拉强度为367.6 MPa,约为母材强度的62.4%,为焊接接头的薄弱环节.

     

    Abstract: The 7075 aluminum alloy sheet with thickness of 10 mm was welded by VPPA vertical welding process using ER5183 welding wire. The microstructure and mechanical properties of the welded joint were comparatively investigated by means of optical microscope (OM),scanning electron microscope (SEM), X-ray diffraction (XRD),universal tensile testing machine and micro-hardness testing machine. Experimental results indicate that the finally welded products exhibit an excellent welding appearance, and have no obvious fusion zone, the microstructure of heat-affected zone is coarse, the hardness value of welded joint and heat-affected zone are 120.9 and 125.9, respectively. The tensile strength of the welded joint reaches 367.6 MPa, which is nearly 62.4% of the parent metal and corresponds to the weakest segment of the welded joint.

     

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