I am in VIC and need the use of a MIG?
What is the go with your spot welder, home made or bought?

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It's easy once you know how.

I've had the spot welder for a few years now. A fellow up Tenterfield way was getting out of the garage business, and had a number of Mini bits e offered to me. In amongst them was the spot welder. Greatest thing ever when changing panels IMHO.
You can do a half spot just to tack it in place, then if you like it you give it a full shot. Otherwise just wriggle it off.
Pretty useful, it does the rounds

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Mmmmmmm, does it have longer arms to go on?

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It's easy once you know how.

I made a set up once from steel, but had too many problems with the pressure applied at length, and the loss of current voltage along the bars. With the long bars, it's a very low voltage divided by a very low ohm to allow the high current. Add the bars and only a few milliohms of difference makes a really large reduction in current, and hence the outcome. I use plug welds for distant spot welds. Not much problem for standard external panel replacements however.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Hey Mick, a butane torch is a little slow as it needs a localised heat and the temp rise from the butane would spread to quickly in my opinion. The carbon arc the good Dr suggests would be a better option.

As the key is to locally heat then, allow for cross section growth and rapid cooling, the latest is a fraction disc on a grinder. They use stainless steel to avoid galling and the friction produces the heat in a very small patch. Most of the time air cooling with this method is fine.

I'm sure someone out there has a DIY for these discs. I just use the oxy.