You will never need to weld a galvanised subframe, so the problem will not arise. But if it is a non-genuine part, weld the critical seams before it goes for galvanising, as in many cases the spot welds are skimped.
The zinc may suffer from some superficial corrosion, which is why it should be protected by a suitable zinc primer (used to be zinc chromate, but I think that is illegal now, and don't use etch) and sufficient coats of paint to thoroughly seal it. It will not rust if scratched, but you may as well give it maximum protection and have it look nice.
You could powder coat over the zinc.
Galvanized Subframes
Started by
joeyfinneran
, Jun 19 2012 11:09 PM
19 replies to this topic
#16
tiger99
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Crazy About Mini's
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Posted 21 June 2012 - 09:21 PM
#17
waddle
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Super Mini Mad
Posted 21 June 2012 - 09:31 PM
bit of topic but is flexing and fateging common in standard subbys? iv just seam welded mine, and about to tryangulate the tie rods for when i turbo, but will this be of benifit with a standard lump?
#18
sonikk4
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Twisted Paint Polisher!!!
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Posted 22 June 2012 - 02:23 PM
A subframe in good condition should not need anymore strength adding to it, however adding some more welds along the existing seams will not do it any harm. (Done this to the front subbie on Erm and also seam welded the turrets for the smooth look)
If you want to weld something that's been galvanised then you need to grind it off and not scrape it. Also if you weld something that's not properly cleaned of the coating its gives off a acrid fume which is not good for you.
As to Galvanising corroding in essence that's the idea of it as its a sacrificial coating to prevent damage to the steel underneath. Like any coating it does need to be looked after so any damage that may have removed any of the coating will need to be treated.
If you want to weld something that's been galvanised then you need to grind it off and not scrape it. Also if you weld something that's not properly cleaned of the coating its gives off a acrid fume which is not good for you.
As to Galvanising corroding in essence that's the idea of it as its a sacrificial coating to prevent damage to the steel underneath. Like any coating it does need to be looked after so any damage that may have removed any of the coating will need to be treated.
#19
waddle
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Super Mini Mad
Posted 24 June 2012 - 10:57 AM
thankyou, iv nearly fineshes welding mine, just off to beef up the tie rods now :)
#20
liam-ds
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Super Mini Mad
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Posted 26 June 2012 - 08:06 PM
he must drive very very carfuly !
Youd think so but he drive crazy sometimes haha, hes 70 , 850 engine and shows us 1275 lads up in the corners he dont half throw it around, well looked after though, raduis arm bearings greased very regularly
haha me and jake where with this guy yesterday he was driving it down a tiny lane only 4x4's go down.
back on subject ive heard some say they warp and some say they dont so im 50/50
Liam
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