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中文摘要：
采用不同焊接速度对2219铝合金进行搅拌摩擦焊接,焊后通过标示材料观察焊缝根部塑性金属的流动特征.结果表明：在其他条件一定时,随着焊接速度的增加,焊缝根部前进边侧容易产生孔洞缺陷,焊接速度为75 nun/min时,无孔洞缺陷产生;随着焊接速度的增加,搅拌针所形成的“抽吸挤压”效应减弱,根部塑性金属流动的驱动力减小,而其做塑性迁移的阻力增大,导致塑性金属流动范围随之减小.
英文摘要：
The butt joining of 2219 Aluminum was carried out by using friction stir welding with different welding speed. The pattern of root flow of friction stir welding was analyzed under different conditions through labeling material. The results show that, when other conditions are constant, it is easy to produce cavities on the advance side of root weld with the increase of weld speed. There is no cavity when the weld speed is 75 ram/rain. With the increase of weld speed, the sucking-extruding effect weakened and the drive force of root plastic metal flow decreased. However, the resistance of plastic flow increased which leading to the range of plastic metal flow decreased.
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Thermo-mechanical Coupled Analysis of Deformation Behavior in Friction Stir Welding Process of Alumi
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