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摘要：本课题针对4mm厚的6061铝合金板材及4mm厚的AZ31B镁合金板材，进行了添加元素的钨极氩弧焊接工艺试验研究。大量的工艺试验研究结果表明，当铝板在上，镁板在下，并在镁合金板材上面涂上适量氟化钙，在工艺为电流为175A，焊接速度为30cm/min时，可以得到较好的焊缝；这种添加氟化钙，可以形成少量的Al2Ca， Al2Ca相能够阻止Mg17Al12凝固和冷却后期晶粒的长大，使得焊缝组织细化，有利于提高焊缝的力学性能。同时，研究发现，添加氟化钙后，同样的工艺参数下，焊接接头熔深变小，减少了镁合金母材熔化量，即减少了铝镁金属间化合物的生成量。试验表明，添加氟化钙的接头强度较高，达到21.9MPa，断裂在靠近铝侧熔合线。而未添加氟化钙的试样强度仅为8MPa，断裂在靠近镁侧熔合线附近。23864
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关键词：铝镁异种金属 钨极氩弧焊 异种金属焊接
毕业设计说明书（论文）中文摘要
毕业设计说明书（毕业论文）外文摘要
Title A study on dissimilar metal of aluminum and magnesium TIG welding process
Abstract The method of adding metal elements GTAW is used for welding 4 mm thick 6061 aluminum alloy sheet and 4mm thick AZ31B magnesium alloy sheet .A study of aluminum and magnesium dissimilar metals TIG welding process is this article. A large number of process test results show that, when the aluminum plate placed above the surface of the magnesium plate, the surface of magnesium alloy sheet with a generous amount of calcium fluoride, in a process for the current 175A , 30cm/min as the welding speed, it is possible to obtain a good weld; this method of painting some calcium fluoride can form a small amount of Al2Ca，Al2Ca phase can prevent Mg17Al12 solidification and grain grow at the late cooling process, making the weld microstructure refinement, helping to improve the mechanical properties of the weld. Meanwhile, the study found that the addition of calcium fluoride, at the same process parameters, could get smaller penetration welded joints, and reduce the amount of magnesium alloy metal melting, which reduces the amount of inter-generation aluminum-magnesium metal compounds. Tests showed that the joint addition of calcium fluoride strength is higher, up to 21.9MPa, and the aluminum side of the fracture near the fusion line. Sample strength without added calcium fluoride only 8MPa, the fracture near the side of the magnesium fusion line.
Key words : GTAW aluminum and magnesium dissimilar metals
目 录
1 绪论 1
1.1 选题的背景及意义 1
1.2 铝镁异种金属焊接工艺 1
1.3 铝镁异种材料的焊接性 3
1.4 铝镁异种材料焊接问题 3
1.5 趋势与展望 5
1.6 本课题研究内容 5
2 焊接工艺方案设计与系统构建 6
2.1 钨极氩弧焊焊接工艺设计 6
2.2 试验方案 6
2.3 试验条件 8
2.4 焊接试验 9
2.5 硬度测试 10
2.6 金相组织分析过程 11
2.7 电镜分析过程 11
3 铝镁异种金属钨极氩弧焊工艺试验研究 13
3.1 不同焊接参数的钨极氩弧焊焊接试验 13
3.2 本章小结： 18