| 摘要: |
| 为认知铝合金三元气体保护焊接中微量氮气混入的重要性,研究了纯氩、氩氦二元气体保护、氩氦氮三元气体保护焊条件下铝合金焊接电弧形态、焊接接头宏观及微观组织、热影响区宽度的区别.试验结果表明,三元气体保护焊电弧收缩最为显著,焊缝晶粒最为细小,热影响区最窄,接头冲击韧性最高,焊接质量最高.纯氩气体保护焊焊接接头性能次之,氩氦二元气体保护焊接接头性能最低.结果表明,微量氮气的加入对于三元气体保护焊接质量提升是非常重要的因素. |
| 关键词: 氩氦二元气体 氩氦氮三元气体 铝合金 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51005069,51205106) |
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| Comparison of Ar-He and Ar-He-N2 gas shielding metal arc welding technology for aluminum alloy |
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LU Hao1, XING Liwei1, LIANG Zhimin2
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1.CSR Qingdao Sifang CO., LTD., Technique headquarters, Qingdao, 266111, China;2.Faculty of Material Science and Engineering, Hebei University of Science & Technology, Shijiazhuang 050000, China
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| Abstract: |
| In order to recognize the importance of the addition of trace nitrogen in the triple gas mixture, the difference of the aluminum welding was studied in terms the arc shape, macro and micro-welded joint structure, the width of heat affected zone, by using pure argon, binary Ar-He mixture, triple Ar-HeN2. In comparison to the MIG welding using pure argon and ArHe, the arc was more concentrated that allow a production of best quality of joint with highest impact toughness and narrow HAZ.The performance of the welding joint using pure argon was the next-best. The work shows that adding trace nitrogen is a very important factor for the improvement of welding quality using ArHe-N2 triple gas shielding. |
| Key words: Ar-He Ar-He-N2 gas aluminum |
