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7075-T6鋁合金激光-MIG復(fù)合焊焊接接頭疲勞壽命原位研究
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北京科技大學(xué) 新金屬材料國(guó)家重點(diǎn)實(shí)驗(yàn)室,北京科技大學(xué) 新金屬材料國(guó)家重點(diǎn)實(shí)驗(yàn)室,北京科技大學(xué) 新金屬材料國(guó)家重點(diǎn)實(shí)驗(yàn)室,西南交通大學(xué) 牽引動(dòng)力國(guó)家重點(diǎn)實(shí)驗(yàn)室

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國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Investigation of fatigue lifetime of Laser-MIG hybrid welded joint of 7075-T6 aluminum alloy by in-situ observation
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State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory of Traction Power,Southwest Jiaotong University

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    摘要:

    本文對(duì)7075-T6鋁合金激光復(fù)合焊焊接接頭的疲勞壽命進(jìn)行了探究。結(jié)果表明：疲勞裂紋萌生壽命與疲勞壽命之間存在著一定的比例關(guān)系。對(duì)于母材試樣,該比值為64.5%；而對(duì)于焊接接頭試樣,該比值為20.2%。疲勞斷口表面觀察發(fā)現(xiàn),母材試樣的疲勞斷口上存在大量韌窩,而焊接接頭試樣疲勞斷口上存在許多氣孔。這些氣孔被認(rèn)為是引起焊接接頭疲勞裂紋萌生壽命急劇下降的主要原因。

    Abstract:

    The fatigue lifetime of the laser-MIG hybrid welded joint of 7075-T6 aluminum alloy was studied in this paper. The results showed that there existed a strong relationship between the fatigue crack initiation lifetime and fatigue failure lifetime. For the base metal specimens the ratio of fatigue crack initiation lifetime and fatigue failure lifetime was about 64.5%, while for the welded joint specimens it was about 20.2%. The observation of fatigue fracture surface showed that there existed a large number of dimples in the base metal specimens, while there appeared lots of gas porosities in the welded joint specimens instead. These gas porosities were regarded to be the reason of lower fatigue crack initiation lifetime.

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張寅,宋西平,常麗艷,吳圣川.7075-T6鋁合金激光-MIG復(fù)合焊焊接接頭疲勞壽命原位研究[J].稀有金屬材料與工程,2017,46(9):2411~2416.[Zhang Yin, Song Xiping, Chang Liyan, Wu Shengchuan. Investigation of fatigue lifetime of Laser-MIG hybrid welded joint of 7075-T6 aluminum alloy by in-situ observation[J]. Rare Metal Materials and Engineering,2017,46(9):2411~2416.]
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  • 收稿日期:2015-09-25
  • 最后修改日期:2015-10-21
  • 錄用日期:2015-11-18
  • 在線發(fā)布日期: 2017-11-29
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