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Thread: Negatives to using stainless steel sheet for underbody repairs

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    Guest jj205mi16's Avatar
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    Negatives to using stainless steel sheet for underbody repairs

    I repaired my passenger side sill last year and I’m about to do the same with the driver side, for the internal sill sections and rear support mount, what would the negatives be for using 0.5mm stainless rather than mild steel sheet?

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    You shouldn't have issues welding stainless to mild, but you will have with using 0.5mm sheet, you want 1.2mm at least.

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    Guest jj205mi16's Avatar
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    There are a good few layers but none of what’s there looks to be near 1.2 not that that’s a huge concern.

    I’ve seen a sheet of 20 gauge 600x200 for around a tenner.

    Just wondering if there’s something against using stainless to repair sections. Just not something you see much. I’m not trying to recreate the delorean just replacing what needs replaced with something a bit more durable.




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    Don’t know much but it tends to be harder to form iirc, it work hardens pretty quickly I’ve found.
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    Quote Originally Posted by Chriscooke View Post
    Don’t know much but it tends to be harder to form iirc, it work hardens pretty quickly I’ve found.
    So maybe more prone to cracking Chris? Rather than rusting I’d need to weld up the cracks . Maybe I should stick to mild steel and decent protection.


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    I'd sooner use similar material and thickness when repairing structural areas such as sills and mounting points. Correctly rust protecting the repairs during and afterwards will be the way to go imo

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    Quote Originally Posted by Mike41288 View Post
    I'd sooner use similar material and thickness when repairing structural areas such as sills and mounting points. Correctly rust protecting the repairs during and afterwards will be the way to go imo

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    you may be right Mike

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    unless you have a roll of something like 309L welding wire you will dilute the weldpool. you will probably find the mild steel side is more susceptible to corrosion because of metology or however its spelt reasons.

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    its not ideal due to galvanic corrosion. it will cause the carbon steel around it will corrode faster.

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    Quote Originally Posted by s200rat View Post
    its not ideal due to galvanic corrosion. it will cause the carbon steel around it will corrode faster.
    ive never heard of that before, im glad i asked the question. cheers again

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