How Electrolytic Weld Cleaning Works

A guide to why welds discolour and how electrolytic cleaning restores a clean, passivated finish.

  • How Electrolytic Weld Cleaning Works

    A quick guide to why welds discolour, what electrolytic cleaning actually does, and how it compares to acid pickling and mechanical polishing.

    Shop weld cleaning 

Why welds need cleaning

TIG and MIG welding stainless steel leaves a heat-affected zone where the thin chromium oxide layer that makes the metal 'stainless' has been disrupted. This shows up as a blue, brown or black heat tint — and, more importantly, leaves the surface more vulnerable to corrosion until it's treated.

  • What electrolytic cleaning does

    A cleaning pad or brush carries a mild electrolyte solution and a low-voltage current across the weld. The current strips away the discoloured oxide layer and encourages the chromium in the surrounding steel to re-passivate — restoring the corrosion-resistant layer without removing base material.

Electrolytic cleaning vs the alternatives

  • Acid Pickling

    Effective, but uses hazardous acid pastes and gels that need careful handling, ventilation and disposal.

  • Mechanical Polishing

    Removes material rather than restoring it, can leave an inconsistent finish, and is slow on long weld runs.

  • Electrolytic Cleaning

    Fast and precise, and passivates as it cleans — no acid handling required.

  • Ready to see it in action?

    Browse the range or get in touch to talk through your application.

    Shop weld cleaning