Andyquadra
Well-Known Member
its French! LOL
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21 Turbo My Current 21 In Pictures
- Thread starter la21t
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la21t
Well-Known Member
Yeah, I'd been underneath it a few times and it wasn't self healing so figured the worst would appear once jacking points were cut out.
Only Renault will know why they're not fully welded and have 2 great big holes in them. The chap that put it all right lamented the fact he hadn't had time to copy them but in better material and without the daft holes.
The new floor sections and sills are stainless and thicker than OE. So in 25years there'll be 4 wheels a subframe and whatever he fabricated sat among some orange dust.
roddy21t
Well-Known Member
Keep an eye on them welds Lee. Welding stainless steel to mild or carbon steel is never a good thing. You will quickly start seeing galvanic corrosion taking place. The stainless and mild steel panels will be ok but the joining welds will not.
la21t
Well-Known Member
I asked them that and was assured all would be ok.......one of the lads there welds alloy and all sorts. He'll make you a gate in about 10mins.
Odd that Roddy cos that was my first fear.
DaveL485
Staff member
r5gordini
Well-Known Member
found on 'tinternet:
Risk of bimetallic corrosion at welds between carbon and stainless steel
Unprotected welds subject to aggressive environments such as immersion in seawater could result in sacrificial corrosion to the less noble carbon steel part. However, post weld surface coating repair would normally be needed to the carbon steel to 'restore' the corrosion protection.
If this re-coating / painting is allowed to lap over onto the weld bead then the joint should not be at risk to bimetallic corrosion in any environment so long as the coating is sound. Ideally the weld bead should be covered so that only the 'parent' stainless steel is ultimately exposed. This ensures that galvanic corrosion cells cannot be set up across the joint, where there is a composition 'gradient'.
Risk of bimetallic corrosion at welds between carbon and stainless steel
Unprotected welds subject to aggressive environments such as immersion in seawater could result in sacrificial corrosion to the less noble carbon steel part. However, post weld surface coating repair would normally be needed to the carbon steel to 'restore' the corrosion protection.
If this re-coating / painting is allowed to lap over onto the weld bead then the joint should not be at risk to bimetallic corrosion in any environment so long as the coating is sound. Ideally the weld bead should be covered so that only the 'parent' stainless steel is ultimately exposed. This ensures that galvanic corrosion cells cannot be set up across the joint, where there is a composition 'gradient'.
roddy21t
Well-Known Member
The primer or how any coats is not the issue .. you can coat it in liquid gold but it wont make any difference. The issue is the weld itself and how its welded. If the welder has used dissimilar welding rods or wire then the weld should be fine. A way to tell if dissimilar rods or wire have been used is that the weld itself will be nice & shiny, if it's not then the wrong process has been used.
The more noble metal will always win over a less noble metal ... unless the proper process has been used.
This is what i'm involved in as my job ... when i hear of stainless and mild steel mixing it just gives me the judders, Hope all is ok and i'm sure it will be, just trying to help.
The more noble metal will always win over a less noble metal ... unless the proper process has been used.
This is what i'm involved in as my job ... when i hear of stainless and mild steel mixing it just gives me the judders, Hope all is ok and i'm sure it will be, just trying to help.
DaveL485
Staff member
The rest of the French tin will rot away well before he's gotta worry about welds and the new metal mate
Georgi Galabov
Member
Looks fantastic
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