Is Post-Weld Pickling and Passivation Always Necessary?

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Three situations where it is mandatory, two where it can be simplified, and alternative solutions.

Mandatory: welds on food and pharmaceutical equipment, in seawater and chemical environments, and where hygiene or corrosion-resistance acceptance requirements apply.

Can be simplified: indoor decorative parts, non-corrosive media, and workpieces that will undergo subsequent overall surface treatment (such as overall pickling or electropolishing).

Alternative solution: local mechanical grinding of the weld plus electropolishing can reduce acid use; however, grinding must thoroughly remove the oxidation tint in the heat-affected zone, otherwise the passive film cannot be restored.

Note: waste acid treatment must comply with local environmental requirements and must not be discharged directly.

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。

Is Post-Weld Pickling and Passivation Always Necessary?

Three situations where it is mandatory, two where it can be simplified, and alternative solutions.

Mandatory: welds on food and pharmaceutical equipment, in seawater and chemical environments, and where hygiene or corrosion-resistance acceptance requirements apply.

Can be simplified: indoor decorative parts, non-corrosive media, and workpieces that will undergo subsequent overall surface treatment (such as overall pickling or electropolishing).

Alternative solution: local mechanical grinding of the weld plus electropolishing can reduce acid use; however, grinding must thoroughly remove the oxidation tint in the heat-affected zone, otherwise the passive film cannot be restored.

Note: waste acid treatment must comply with local environmental requirements and must not be discharged directly.

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。