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。

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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。

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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.

虽然它让我失望，在某些方面(照顾团的黑色氧化完成所需的)，这是一个非常强劲的表现已经赢得了我与它的感觉和一致性袋的出发点。

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