Weld Color Acceptance: What Silver to Black Indicates

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焊接 · 焊缝颜色 · 验收 · 酸洗钝化

Stainless steel weld color reflects oxidation and heat input: silver-white/pale gold is best, blue-purple indicates increased oxidation, gray-black indicates poor shielding and requires pickling/passivation and assessment of corrosion resistance.

Insufficient shielding gas or excessive heat input during welding causes oxidation of the weld and heat-affected zone, producing different colors.
General interpretation:
· Silver-white: good shielding, extremely thin oxide film, corrosion resistance essentially unaffected;
· Pale gold/light blue: mild oxidation, usually acceptable, local pickling if necessary;
· Deep blue/purple: heavier oxidation, reduced corrosion resistance, pickling and passivation recommended;
· Gray-black/flaking: severely inadequate shielding, oxide layer must be removed and rework evaluated.
Acceptance recommendations: Agree on the acceptable color range per project or standard (e.g., AWS D18.2 color chart), specify pickling and passivation requirements and inspection methods, and avoid subjective judgment by visual inspection alone.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。

Weld Color Acceptance: What Silver to Black Indicates

Insufficient shielding gas or excessive heat input during welding causes oxidation of the weld and heat-affected zone, producing different colors.
General interpretation:
· Silver-white: good shielding, extremely thin oxide film, corrosion resistance essentially unaffected;
· Pale gold/light blue: mild oxidation, usually acceptable, local pickling if necessary;
· Deep blue/purple: heavier oxidation, reduced corrosion resistance, pickling and passivation recommended;
· Gray-black/flaking: severely inadequate shielding, oxide layer must be removed and rework evaluated.
Acceptance recommendations: Agree on the acceptable color range per project or standard (e.g., AWS D18.2 color chart), specify pickling and passivation requirements and inspection methods, and avoid subjective judgment by visual inspection alone.

本文由 SteelWe 编辑与行业专家整理，内容仅供行业交流参考，不构成交易或投资建议。引用请注明来源。