Effect of Groove Type and Interlayer Temperature on Mechanical Properties of Butt Welded Joint of 5083 Spherical Flat Aluminum for Ship
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摘要: 采用“V”型坡口、较高的层间温度（工艺1）及“V（腹板）+X（面板）”型坡口、较低的层间温度（工艺2）对船用5083球扁铝进行施焊，研究了其对接焊接头力学性能的影响。试验结果表明，与工艺1相比，工艺2获得的焊接接头内部质量较好，力学性能优异。工艺1因坡口尺寸较大，焊丝填充量较大，焊接道次较多，加之连续施焊，导致层间温度较高，积累的热量过大，引起焊接试板过热，致使焊接熔池的体积变大，熔池内的铝液在凝固时未能发生顺序凝固，从而形成疏松组织；工艺2可抑制焊缝部位疏松缺陷的形成，进而提高接头的力学性能。Abstract: Welding was carried out on marine 5083 spherical flat aluminum by process 1 of V-groove and higher interlayer temperature and process 2 of V(webs) + X(panel) groove and lower interlayer temperature, and the effects of the two processes on the mechanical properties of butt welded joints were studied. The results showed that the internal quality and mechanical properties of the welded joint obtained by process 2 were better than those by process 1. The groove size of process 1 was large, so the feeding amount of welding wire was large, the welding passes increased. Besides, the welding was continuous. The above reasons led to high inter layer temperature, large amount of accumulated heat and the overheating of the welding test plate. The heat made the volume of the welding pool become large, and the liquid aluminum in the pool failed to solidify in sequence during solidification, thus forming loose structure. Process 2 could inhibited the formation of loose defects in the weld and improve the mechanical properties of the joint.
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