The AA6082 aluminum alloy was welded by oscillating laser-MIG hybrid welding. By using beam oscillation, the porosity can be effectively suppressed in the range of 100−300 A arc current, especially at low arc current level. Percent porosity decreased greatly with the increase of the oscillating amplitude and frequency. The threshold frequency of porosity-free at different amplitudes were achieved. The effect of beam oscillation on porosity formation and suppression was studied by observing keyhole behavior via a “sandwich” high-speed video method. It was found that the porosity suppression depended on three reasons. Firstly, high-frequency oscillating keyhole can “capture” the bubbles or cavities in the molten pool and solidification front. Secondly, high-frequency oscillating keyhole can enlarge the diameter of keyhole and improve keyhole stability. Thirdly, beam oscillation can form stirring effect in molten pool, which can produce turbulence to reduce possibility of bubbles moving to the solidification front.

AA6082铝合金通过振荡激光-MIG混合焊接进行焊接。通过使用束振荡，可以在100-300 A电弧电流范围内有效地抑制孔隙率，尤其是在低电弧电流水平下。孔隙率随振荡幅度和频率的增加而大大降低。获得了在不同振幅下无孔隙的阈值频率。通过“三明治”高速视频方法观察匙孔行为，研究了光束振荡对孔隙形成和抑制的影响。发现孔隙率抑制取决于三个原因。首先，高频振荡小孔可以“捕获”熔池和凝固前沿的气泡或空腔。其次，高频振荡锁孔可以增大锁孔的直径，提高锁孔的稳定性。第三，束流振荡会在熔池中形成搅拌效应，从而产生湍流，从而减少气泡向凝固前沿移动的可能性。