摘要本文针对16mm厚的高氮钢板，应用双丝PMIG焊接工艺，进行对接焊接工艺试验研究。对所获得的焊缝进行了外观检查和X光无损检测，并进一步对接头进行力学性能试验，微观组织分析和氮含量分析。68187

试验结果表明，为了获得相对良好的焊接接头，正面焊缝，辅丝的焊接电流251A、焊接电压25.5V，主丝的焊接电流277A、焊接电压26.8V，焊接速度0.36m/min、频率为50HZ。背面焊缝，辅丝的焊接电流264A、焊接电压26.1V、主丝的焊接电流287A、焊接电压27.3V，焊接速度0.36m/min、频率为50HZ；X光检测焊缝质量达到II级。所获得焊接接头平均冲击功为135J，略低于母材，基本达到要求。通过微观组织分析发现，焊缝组织与热影响区组织已发生了明显变化，为了避免焊接缺陷的产生，必须严格控制各种焊接工艺参数。

毕业论文关键词：高氮钢  双丝PMIG  焊接参数  力学性能试验  微观组织  氮含量

毕业设计说明书（论文）外文摘要

Title  High nitrogen steel double wire PMIG welding process researching of rich nitrogen by robot                              

Abstract

In this paper, facing to 16mm thick high nitrogen steel, using double wire PMIG welding process, docking welding process was studied. And the appearance of the welds obtained X-ray inspection testing, And further tests on the mechanical properties of joints, microstructure analysis and nitrogen content analysis 

The results show that for the comparatively good welds joints, the positive seam, the assist wire welding current is 251A, the welding voltage is 25.5V, the master wire welding current is 277A, the welding voltage is 26.8V, the welding speed is 0.36m/min, when the frequency is 50HZ.The back seam, the assist wire welding current is 264A, welding voltage is 6.1V, the master wire welding current is 287A, welding voltage is 27.3V welding speed is 0.36m/min, frequency is 50HZ; X-ray detection weld quality achieves to level II. Welded joints obtained by the average impact energy of 135J, slightly lower than the base material, meet the requirements. By microstructure analysis, weld and heat affected zone has undergone significant changes, in order to avoid the generation of welding defects, various welding parameters must be strictly controled.

Keywords: high nitrogen steel   double wire PMIG   mechanical testing   microstructure   nitrogen content

目录

1  绪论 1

1.1  选题背景及意义 1

1.2  高氮钢焊接技术难点 2

1.3  国内外有关高氮钢焊接过程氮行为的研究 2

1.4  双丝PMIG焊的优点 5

1.5  双丝焊的研究及其应用 5

1.6  其他高氮钢焊接方法 5

1.7  本课题研究内容 7

2  实验设备和实验材料 8

2.1  实验设备 8

2.2  试验材料 8

3  焊接过程 10

3.1  焊接工艺制定 10

3.2  焊前处理 11

3.3  施焊与焊后检测 11

3.4  本章小结 17

4  焊接力学性能试验和微观组织观察与分析