Welding to SS 304L

Hi Expert,
What happen to this picture, it show black colour when welding to SS 304L.
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Those are oxidation marks.
Argon shielding envelope leaving the hot metal before it has a chance to cool enough to not oxidize.
If you were to use a really large tig nozzle, things would improve

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Em kiểm tra lại khí bảo vệ thế nào, bên anh hàn ra màu vàng ánh đẹp lắm.

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