...藏 subsurface defect 内部缺陷 ; 面下缺陷 ; 近表面缺陷 ; 亚表面缺陷 Subsurface discontinuity 近表面不连续性 ; 表面下缺陷 ..
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焊点中存在的主要缺陷是气孔，表面下塌，热裂纹，其中气孔主要为氧化膜气孔和匙孔不稳定形成的气孔。
The main defects of laser spot welding of aluminum are crater, hot crack and porosity which created by oxide film and keyhole instability,.
结果表明，该轴断裂是由于轴表面存在焊接缺陷，在旋转弯曲应力作用下产生低应力疲劳开裂。
The results showed that the weld detects on the surface of the axle was the reason to cause low stress fatigue under rotation bending stress which finally lead to the fatigue cracks on the axle.
在氦-氩混合气体保护条件下，对AZ31 镁合金板材进行了TIG 焊接，获得了表面光滑、无堆高和无变形等缺陷的焊缝。
The He-Ar mixed gas TIG welding for AZ31 magnesium alloy plate by was carried out. The surface of observed joint is smooth free from heap high and appearance defects.
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