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摘要结合高强铝合金焊接的特点、难点,介绍了几种目前国际上焊接高强厚板铝合金的新工艺，新方法——搅拌摩擦焊、双丝MIG焊、激光-电弧焊；与传统电弧焊相比,它们在厚板高强铝合金焊接方面更具优越性。23420
- 上一篇：铝/镁异种材料搅拌摩擦焊接研究
- 下一篇：高强铝合金多层结构整体钎焊过程变形ADINA有限元模拟
本课题试验针对40mm厚的7A52铝合金板，应用双脉冲MIG焊接工艺，先在8mm的试板上进行堆焊，选取合适焊接工艺参数，进行多层多道对接焊接试验研究，并对获得的焊缝进行了宏观成型观察和微观组织分析。通过微观组织分析各种缺陷成因，提出合理的焊接工艺参数。
关键词 7A52铝合金 双脉冲MIG 焊接工艺参数 多层多道焊 微观组织
毕业设计说明书（毕业论文）外文摘要
Title Medium thickness plate high-strength aluminum alloy
double pulse welding robot technology research
Abstract
Combining with the characteristics of high strength aluminum alloy welding, the difficulty, introduces several current international new technology of aluminum alloy welding high strength board, new method --, friction stir welding, double wire MIG welding, laser - arc welding; Compared with the traditional electric arc welding, they are more advantages in terms of thickness plate high-strength aluminum alloy welding.
This topic test for 40 mm thick of 7A52 aluminum alloy plate, application of double pulse MIG welding process, on the first try in 8 mm plate welding, to select appropriate welding process parameters,multi-level multi-channel butt welding experiment research, and has carried on the macro to obtain the weld shape observation and microstructure analysis. Through the microstructure analysis of various defects causes, and puts forward reasonable welding process parameters.
Keywords 7A52 Aluminum alloy Double pulse MIG Welding process parameters Multilayer multi-channel welding microstructure
目 次
1 绪论 1
1.1 选题背景与选题意义 1
1.2 厚板高强铝合金焊接研究现状 2
1.3 厚板高强铝合金的焊接新工艺 4
1.3.1 高强铝合金的搅拌摩擦焊 4
1.3.2 厚板高强铝合金的搅拌摩擦焊 5
1.3.3 高强铝合金的双丝 MIG 焊 7
1.3.4 厚板高强铝合金的双丝 MIG 焊 8
1.3.5 高强铝合金的激光-电弧焊 9
1.5 课题研究内容 11
2 试验材料和设备 13
2.1 试验材料 13
2.2 试验设备 14
2.3 焊接试验流程 15
2.3.1 焊前处理 15
2.3.2 施焊 16
2.4 金相组织分析 18
3 高强铝镁合金焊接工艺试验研究 19
3.1 堆焊焊接工艺研究 19
3.1.1 堆焊焊接规范 19
3.1.2 堆焊焊缝外观成型 20
3.2 对焊焊接工艺研究 23
3.2.1 坡口设计 23
3.2.2 多层多道焊接顺序规划 23
3.2.3 多层多道对接工艺试验 24