| 铝合金激光深熔焊气孔形成机理与控制技术 |
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| 引用本文： | 巩水利,姚伟,SteveShi.铝合金激光深熔焊气孔形成机理与控制技术[J].焊接学报,2009,30(1):60-62. |
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| 作者姓名： | 巩水利 姚伟 SteveShi |
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| 作者单位： | 1. 北京航空制造工程研究所高能束流加工技术国防科技重点实验室,北京,100024
2. 英国焊接研究所,英国,剑桥,CB |
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| 摘 要： | 观察了铝合金激光深熔焊气孔的分布特征和形貌特征,深入分析了气孔的形成机理,研究了双光点能量分布的激光对铝合金激光深熔焊气孔的控制效果.结果表明,铝合金激光深熔焊焊缝中存在分布特征和形貌特征不同的两类气孔,即冶金类气孔和工艺类气孔.冶金类气孔的形成与氢在熔池中的析出、聚集与合并有关,而工艺类气孔产生的根本原因是焊接过程中匙孔的瞬间失稳.采用双光点能量分布的激光焊接铝合金可以扩大匙孔张口和根部直径,改善匙孔壁的波动状态,增强匙孔的稳定性,从而减少工艺类气孔的产生,但对冶金类气孔没有明显影响.
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| 关 键 词： | 激光深熔焊 气孔 双光点 铝合金 |
| 收稿时间： | 2008/2/28 0:00:00 |
Porosity formation mechanisms and controlling technique for laser penetration welding of aluminum alloy |
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| GONG Shuili,YAO Wei and Steve Shi.Porosity formation mechanisms and controlling technique for laser penetration welding of aluminum alloy[J].Transactions of The China Welding Institution,2009,30(1):60-62. |
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| Authors: | GONG Shuili YAO Wei and Steve Shi |
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| Affiliation: | 1. National Key Laboratory for High Energy Density Beam Processing Technology;Beijing Aeronautical Manufacturing Technology Research Institute;Beijing 100024;China;2. TWI Ltd;Cambridge CB1 6AL;United Kingdom |
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| Abstract: | The distribution and appearance characteristics of porosities in laser penetrated weld of aluminum alloy were observed, the formation mechanisms of porosities were analyzed in detail, and the influences of twin-spot laser energy distribution on porosities were investigated. It showed that there are two kinds of porosities, metallurgical and technologic porosities, in laser penetrated weld of aluminum alloy. The formation of metallurgical porosities is related to the separation, congregation and incorporatio... |
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| Keywords: | laser penetration welding porosity twin spot aluminum alloy |
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