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pre and post welding treatment
https://www.ausmini.com/forums/viewtopic.php?f=2&t=88496		 Page 1 of 1
Author:  Aussie Brian [ Sat Jan 31, 2015 8:19 pm ]
Post subject:  pre and post welding treatment
Ok I am ready to start doing some welding work on the shell and as with most cars the parts that require attention are the sections that are either double skinned or boxed in.
My question is in regards to when the pieces are welded back in that there will be uncoated metal due to the heat that is generated by the welding process. It will burn off any pre-coating on the metal which is on the inside of the double skin, it just seams like one step forward and two steps back!!! I know I can spray some rust preventative through a pre drilled hole at the end of the job but this is a bit hit and miss for my liking.
With the amount of professional restoration work being carried out on not just our beloved Mini's I'm betting someone has an answer for me on a pre-welding treatment that will not burn off and expose fresh mild steel to the moisture and rust demons.
Author:  drmini in aust [ Sat Jan 31, 2015 8:34 pm ]
Post subject:  Re: pre and post welding treatment
weld through primer- put on both sides of joint.

https://www.youtube.com/watch?v=FKyu3MWuPR8
Also read the comments below the vid.

http://www.ppgpmc.com.au/docs/Sigmaweld%20199%20DS.pdf
Author:  Aussie Brian [ Sat Jan 31, 2015 8:53 pm ]
Post subject:  Re: pre and post welding treatment
I think I may have just answered my own question, see link :roll: ............ however I will still need to coat it some how after welding.
It is just the thought of those double skinned A panels that does my head in, as any leak in a seam, door hinge holes or any other unforseen gremlin can be a big undoing.

I remember working next door to a guy who did rust repairs on vehicles and he had a system by which he would inject wd40 into areas with a syringe then follow it up with fish oil a day or so later. The theory behind his method was that the wd40 would creep right into the seams which would then create a track for the fish oil to follow.

http://www.rustbuster.com.au/store/pd_w ... n=(organic)|utmcmd=organic|utmctr=(not%20provided)&__utmv=-&__utmk=132762126
Author:  Aussie Brian [ Sat Jan 31, 2015 9:02 pm ]
Post subject:  Re: pre and post welding treatment
Thanks Kev,
Obviously I was searching whilst you were replying :oops:
I should have just sent you a pm straight up as I felt you would have had the answer for me you legend you :wink:
Author:  Harley [ Sat Jan 31, 2015 10:39 pm ]
Post subject:  Re: pre and post welding treatment
Weld through primer is great stuff - I'm yet to see anything with it on rust even left out in the elements!
I put it on everything I weld - nit just car body stuff.
Author:  boomini [ Sat Jan 31, 2015 10:52 pm ]
Post subject:  Re: pre and post welding treatment
I use spray on waxoil wherebever I can. Just make sure its dry before welding... it burns for ages
Author:  drmini in aust [ Sun Feb 01, 2015 8:06 am ]
Post subject:  Re: pre and post welding treatment
If already welded up, fish oil is hard to beat if you can get it in there.
My 1969 Fiat 124 sport bought new, rusted out the rear wheel arches and rear window by 1978.
In 1977 I restored a 1968 one; I must have put 4L or more of fish oil in the sills, doors, arches and below the rear window cavity.
There was no rust showing anywhere when I sold it 12 years later. :)
Author:  Darrell [ Sun Feb 01, 2015 8:12 am ]
Post subject:  Re: pre and post welding treatment
Oh but the smell, how long does it last :?
Author:  drmini in aust [ Sun Feb 01, 2015 8:14 am ]
Post subject:  Re: pre and post welding treatment
Darrell wrote:
Oh but the smell, how long does it last :?

It'll smell like a young man's car for a few weeks, but fish oil eventually skins and the smell goes. :)
You can also buy de-odorized fish oil...
Author:  Darrell [ Sun Feb 01, 2015 9:10 am ]
Post subject:  Re: pre and post welding treatment
It'll smell like a young man's car for a few weeks

Now Doc that's a distant memory but I can :)
Author:  Aussie Brian [ Sun Feb 01, 2015 10:01 am ]
Post subject:  Re: pre and post welding treatment
This is a very important subject and I am glad I raised it as it has a bearing on the longevity of the repairs of the Mini. We don't want these car disappearing due to repairs that are not intentionally bad but end up that way through lack of good information.
Thank you all for the input.

Brian
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