铝合金螺旋管双丝焊接工艺技术研究
关键词 5083铝合金 双面双弧TIG焊接 拉伸试验 微观组织
毕业设计说明书（论文）外文摘要
Title Investigation of Double-sided Double-wire Welding for Spiral Pipe with Aluminium alloy
Abstract
This study aimed to experimentally explore the microstructure and properties of joints undergoing double-sided TIG welding with 6mm thick aluminium alloy plates. The results show that double-sided TIG welding could fit the requirement of spiral pipe welding. The process window for double-sided TIG welding was obtained and the sound welds can be obtained under the condition of a welding speed of 0.24m/min, a welding current of 160A/80A, a distance of upper and lower torch ranged from 0 to 5mm, a distance from torch to plate range from 5 to 6mm, a wire feed rate of 2m/min. The joints had a fine microstructure and no conspicuous welding defects. Also, the average tensile strength of joints is 88% of base metal, and the average yield strength of joints is 97% of base metal.
Keywords 5083 aluminium alloy double-sided TIG welding
目录
1 引言 1
1.1 课题背景及选题意义 1
1.2 铝合金焊接性分析 1
1.2.1 铝镁合金焊接特性 1
1.2.2 铝合金的焊接缺陷 2
1.2.3 铝合金缺陷的防止措施 3
1.3 铝合金焊接方法研究现状 4
1.3.1 熔化极脉冲MIG焊 4
1.3.2 MIG-TIG双面双弧焊接 4
1.3.3 激光—TIG双面焊焊接 5
1.3.4 等离子—TIG焊焊接 6
1.3.5 交流脉冲双面弧焊焊接 6
1.3.6 TIG双面对称焊接 6
1.4 螺旋管焊接 7
1.4.1 螺旋管带钢边缘铣削形状与焊接工艺的匹配 7
1.4.2 螺旋管焊接工艺参数与焊缝形貌的关系 8
1.5 课题主要研究内容 8
2 试验材料、设备及方法 10
2.1 双面双弧TIG 立焊试验方案设计 10
2.2 试验材料 11
2.3 试验方法 12
2.3.1 5083铝合金双面TIG焊接试验 12
2.3.2 金相分析试验 12
3 5083铝合金双面TIG焊接工艺试验研究 13
3.1 6mm5083试板焊接工艺参数 13
3.2 6mm5083铝合金焊接参数分析 14
3.2.1 电流变化的影响分析 14
3.2.2 枪间距变化的影响分析 15
3.2.3 弧长变化的影响分析 17
3.2.4 对接间隙的影响分析 18
3.3 焊缝射线检测 19
3.4 8mm和10mm5083铝合金焊接试验 19