Material oxidation, such as oxidation spot, serious after heat treatment of oxide film.
素材氧化严重，如氧化斑，热处理后氧化膜。
2
The main defects of laser spot welding of aluminum are crater, hot crack and porosity which created by oxide film and keyhole instability,.
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。
3
While it let me down in some respects (the care regiment required for the black oxide finish), it was a very strong performer that has won the starting spot in my bag with its feel and consistency.