铝镁异种金属熔焊工艺及机理研究
发布时间：2018-10-15 08:22
【摘要】：铝镁异种金属的结合可以实现铝和镁的优势互补,因此铝镁焊接性能的研究和改善是其在应用和发展中亟待解决的问题。本课题主要开展了 6061铝合金和AZ31B镁合金的熔焊接工艺试验及机理研究,探索铝镁焊接的成型工艺和力学性能特性,试图获得影响铝镁焊接接头质量的因素和机理。6061铝合金和AZ31B镁合金熔焊工艺试验研究主要分为四部分,一是6061铝合金和AZ31B镁合金直接熔焊对接试验、二是6061铝合金和AZ31B镁合金窄间隙和焊枪偏置铝侧的熔焊对接试验、三是对6061铝合金和AZ31B镁合金焊接接头进行退火热处理试验、四是6061铝合金和AZ31B镁合金加Zn过渡层MIG对接试验。首先进行了 3mm厚的6061铝合金和AZ31B镁合金直接熔焊对接,当焊接电流为65-70A时可以得到有效的焊接接头。其次进行了 3mm厚的6061铝合金和AZ31B镁合金留有空隙和焊枪偏置铝侧的熔焊对接试验,得到的焊接接头外观成型较好。随后对6061铝合金和AZ31B镁合金焊接接头进行了退火热处理的试验研究,当退火温度为350℃时,焊接接头的性能得到了明显改善,抗拉强度有所提升,硬度有所下降。最后进行了 6061铝合金和AZ31B镁合金加Zn过度层对接试验,Zn的加入使得抗拉强度进一步提高,性能得到进一步改善。通过微观组织、力学性能测试、SEM、EDS以及XRD等分析手段对不同的铝镁焊接接头进行了分析发现,Al_3Mg_2和Al_(12)Mg_(17)金属间化合物的产生是影响焊接接头质量的主要原因,热应力和柱状晶对焊接接头有消极影响。通过试验发现,窄间隙和焊枪偏置铝侧可以减少热输出从而控制金属间化合物产生,退火可以减少热应力和柱状晶,加Zn过渡层可以抑制Al_3Mg_2和Al_(12)Mg_(17)金属间化合物的生成。
[Abstract]:The combination of aluminum-magnesium dissimilar metals can realize the complementary advantages of aluminum and magnesium, so the research and improvement of the welding properties of aluminum-magnesium is an urgent problem to be solved in its application and development. The experiment and mechanism study of 6061 aluminum alloy and AZ31B magnesium alloy were carried out in this paper, and the forming process and mechanical properties of aluminum magnesium alloy welding were explored. This paper attempts to obtain the factors and mechanism that affect the quality of Al-Mg welding joint. The experimental research on the welding process of 6061 aluminum alloy and AZ31B magnesium alloy is divided into four parts. One is the direct welding butt welding test of 6061 aluminum alloy and AZ31B magnesium alloy. The second is the weld butt test of 6061 aluminum alloy and AZ31B magnesium alloy with narrow gap and bias aluminum side of welding torch, the third is annealing heat treatment test of 6061 aluminum alloy and AZ31B magnesium alloy welded joint, the fourth is 6061 aluminum alloy and AZ31B magnesium alloy plus Zn transition layer MIG docking test. First, direct welding of 6061 aluminum alloy with 3mm thickness and AZ31B magnesium alloy was carried out, and an effective welding joint was obtained when the welding current was 65-70A. Secondly, the welding butt tests of 6061 aluminum alloy with 3mm thickness and AZ31B magnesium alloy with gap and biased aluminum side of welding torch were carried out, and the appearance of the welded joint was better. Then the annealing heat treatment of 6061 aluminum alloy and AZ31B magnesium alloy welded joints was carried out. When the annealing temperature was 350 鈩，
本文编号：2271942
[Abstract]:The combination of aluminum-magnesium dissimilar metals can realize the complementary advantages of aluminum and magnesium, so the research and improvement of the welding properties of aluminum-magnesium is an urgent problem to be solved in its application and development. The experiment and mechanism study of 6061 aluminum alloy and AZ31B magnesium alloy were carried out in this paper, and the forming process and mechanical properties of aluminum magnesium alloy welding were explored. This paper attempts to obtain the factors and mechanism that affect the quality of Al-Mg welding joint. The experimental research on the welding process of 6061 aluminum alloy and AZ31B magnesium alloy is divided into four parts. One is the direct welding butt welding test of 6061 aluminum alloy and AZ31B magnesium alloy. The second is the weld butt test of 6061 aluminum alloy and AZ31B magnesium alloy with narrow gap and bias aluminum side of welding torch, the third is annealing heat treatment test of 6061 aluminum alloy and AZ31B magnesium alloy welded joint, the fourth is 6061 aluminum alloy and AZ31B magnesium alloy plus Zn transition layer MIG docking test. First, direct welding of 6061 aluminum alloy with 3mm thickness and AZ31B magnesium alloy was carried out, and an effective welding joint was obtained when the welding current was 65-70A. Secondly, the welding butt tests of 6061 aluminum alloy with 3mm thickness and AZ31B magnesium alloy with gap and biased aluminum side of welding torch were carried out, and the appearance of the welded joint was better. Then the annealing heat treatment of 6061 aluminum alloy and AZ31B magnesium alloy welded joints was carried out. When the annealing temperature was 350 鈩，
本文编号：2271942
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