Influence of laser offset on laser welding-brazing of Al/brass dissimilar alloys
Influence of laser offset on laser welding-brazing of Al/brass dissimilar alloys
复制标题
激光偏置对铝/黄铜异种合金激光钎焊的影响
DOI：
10.1016/j.jallcom.2017.05.099
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发表时间：
2017-09-15
影响因子：
6.2
通讯作者：
Feng, J. C.
中科院分区：
文献类型：
--
作者：
Zhou, L.;Li, Z. Y.;Feng, J. C.
采用Zn-15%Al钎料对5052铝合金和H62黄铜异种金属进行了激光对接焊钎焊。激光束偏移量定义为激光束中心到对接面的偏差。研究了激光偏移量（定义为铝侧（-）和黄铜侧（+））对钎焊接头组织和力学性能的影响。当激光束在铝侧照射时，获得了满意的无缺陷的接头，而当激光偏移到黄铜侧时，底部润湿不良，界面裂纹和未焊透。当激光偏移量为-0.6 ~0 mm时，界面组织主要由靠近焊缝的锯齿状Al4.2Cu3.2Zn0.7层和靠近黄铜基体的连续层CuZn组成。当激光偏移向黄铜侧移动（0.3mm）时，由于黄铜的更多熔化和溶解，在CuZn和Al 4.2Cu 3.2Zn 0.7之间形成Al 4Cu 9相。拉伸试验结果表明，随着激光偏移量的增加，接头强度从铝侧向黄铜侧先增加后降低，在激光偏移量为-0.3mm时，接头抗拉强度达到最大值128 MPa，为铝母材的55.7%。所有接头均沿黄铜侧底部沿着断裂，断口呈脆性，断裂位置均延伸至接头上部的焊缝。(C)2017爱思唯尔B. V.保留所有权利。
Laser welding-brazing of dissimilar metals 5052 aluminum alloy and H62 brass in butt configuration was performed with Zn-15%Al filler metal. Laser beam offset was defined as the deviation from the center of the laser beam to the butted joint face. Influence of laser offset (defined Al side (-) and brass side (+)) on microstructure and mechanical properties of welded-brazed joints were investigated. Satisfied and defect-free joints were obtained when laser beam was irradiated at Al side, while poor wetting at the bottom, interfacial cracks and lack of penetration occurred when laser offset was shifted to brass side. When the laser offset was - 0.6-0 mm, the interfacial microstructure mainly consisted of serrated layer Al4.2Cu3.2Zn0.7 adjacent to the weld seam and continuous layer CuZn close to the brass substrate. When the laser offset moved towards brass side (0.3 mm), Al4Cu9 phase formed in between CuZn and Al4.2Cu3.2Zn0.7, due to more melting and dissolution of brass. Tensile test indicated that joint strength increased first and then reduced with laser offset from Al side to brass side, and the maximum tensile strength of 128 MPa was obtained at laser offset of -0.3 mm, which was 55.7% of that of Al base metal. All the joints fractured along the bottom of brass side with brittle fracture surface and fracture location extended into the weld seam at the upper of the joints. (C) 2017 Elsevier B.V. All rights reserved.