In this paper, laser cleaning of the 5083 alloy was used to remove the native oxide film and modify the morphological defects. The effects of oxygen content changes and surface morphology evolution on weld porosity after pretreatment with different energy densities (E) was studied. After laser cleaning, the oxygen element first decreases and then increases. With 3.5–35 J/cm², the surface oxygen content drops by more than 60% compared with the untreated sample. It is the lowest with 17.5 J/cm², a decrease of 75%. The main oxide are Al₂O₃ before and after laser cleaning. Untreated specimens have morphological defects such as scratches, superficial damage, and bulge. As E increased, the morphological defects were modified by the crater, gradually for fusion, and finally formed a striation morphology. The micromorphology after laser cleaning did not significantly affect the penetration and weld width. However, observation of the keyhole behavior reveals the micromorphology can affect the keyhole stability to regulate the process porosity. The change trend of the hydrogen porosity of the weld is consistent with the oxygen content. With 17.5 J/cm², the hydrogen porosity of the weld is 0.9%.

在本文中，使用激光清洗5083合金来去除天然氧化膜并改变形貌缺陷。研究了不同能量密度（E）预处理后氧含量变化和表面形态演变对焊缝孔隙的影响。激光清洁后，氧元素首先减少然后增加。在3.5–35 J / cm ^{2的情况下}，与未处理的样品相比，表面氧含量下降了60％以上。最低的是17.5 J / cm ²，下降了75％。激光清洁之前和之后的主要氧化物是Al ₂ O ₃。未经处理的标本具有形态缺陷，例如刮擦，表面损伤和凸起。作为E火山口增加，形态缺陷被修饰，逐渐融合，最后形成条纹形态。激光清洗后的微观形态并没有显着影响熔深和焊缝宽度。然而，对锁孔行为的观察表明，微观形态可以影响锁孔稳定性，从而调节工艺孔隙率。焊缝氢孔隙率的变化趋势与氧含量一致。在17.5J / cm ^{2的情况下}，焊缝的氢孔隙率为0.9％。