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Welding of dissimilar metals or crevice corrosion?

I had to replace the Brake Lines on my car because of a brake line burst which was caused by corrosion. In my 69 years, I have never seen a major corrosive attack like this one.

The original brake lines that were removed from my vehicle have stainless steel braided flex lines welded to steel brake lines. The corrosion was on all of the steel brake lines where they were welded to the stainless steel flex lines.

What could cause this corrosion?

Could this be caused by the welding of dissimilar metals?

The corrosion looks like it started on the surface of the metal and progress conpletely through the lines.

Walt Ward
Home Owner - Windsor, Connecticut, USA
2005

The steel brake lines were originally protected from corrosion by being plated, most likely with zinc. The plating was destroyed by the heat of welding, and the steel lines then rusted.

Jeffrey Holmes, CEF
Spartanburg, South Carolina
2005

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