Comparative study on laser welding characteristics of aluminium alloy under atmospheric and subatmospheric pressures
Comparative study on laser welding characteristics of aluminium alloy under atmospheric and subatmospheric pressures
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DOI：
10.1179/1362171814y.0000000223
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发表时间：
2014-08
影响因子：
3.3
通讯作者：
Chuang Cai;G. Peng;Liqun Li;Y. B. Chen;L. Qiao
中科院分区：
文献类型：
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作者：
Chuang Cai;G. Peng;Liqun Li;Y. B. Chen;L. Qiao
对10 mm厚铝合金板在常压和亚大气压下的激光焊道进行了对比研究。随着环境压力的降低，侵彻深度先急剧增加，然后逐渐趋于平缓。在101Pa压力下焊接，最大熔深可达8.7 mm，而在常压下，最大熔深仅为4.9 mm。在10−1pa的环境压力下，获得了无气孔的焊道。在101Pa压力下焊接接头的平均抗拉强度为300·2 Mpa。随着环境压力的进一步降低，拉伸强度保持不变。随着环境压力的降低，等离子体羽流对激光的屏蔽作用被抑制。因此，有效地增强了小孔内的激光功率沉积。在亚大气压下，由于小孔的稳定性和液体流动的变化，即沿小孔后壁向上移动，有效地消除了孔洞缺陷。
Laser bead on plate welding of 10 mm thick aluminium alloy under atmospheric and subatmospheric pressures were comparatively investigated. With the decrease of ambient pressure, the penetration depth increased sharply at first and then gradually levelled off. The largest penetration depth could reach 8·7 mm when welded under the pressures of 101 Pa, while only 4·9 mm under atmospheric pressure. Weld bead without any porosity was produced under ambient pressures of 10−1 Pa. The average tensile strength of joints welded under the pressure of 101 Pa was 300·2 MPa. The tensile strength remained constant as the ambient pressure decreased further. The shielding effect of plasma plume on laser beam was suppressed as the ambient pressure decreased. Therefore, the laser power deposition inside the keyhole was enhanced effectively. Under subatmospheric pressure, the porosity defects were eliminated effectively due to the keyhole stability and the change of liquid flow, i.e. moving upward along the rear wall of keyhole.