I get on fine with my Clarke 90EN (the gasless version of the Pro 90). When my car failed it's MOT last year, I took the plunge and tried welding for the first time. I found the old SIP MIG I had was rubbish (lousy wire feed which seems to be a common complaint on SIPs). However the Clarke works a treat and I have nearly finished the various chassis repairs. If I have one small complaint about the 90EN it is that the current settings are controlled by switches – as Rich says the ability to fine tune current using a knob is better.
Whatever MIG you might go for, I would advise:
1. Make sure it has low current settings (e.g. goes down to about 30 Amps) – very important for thin/old car bodywork if you don’t want to blow holes everywhere.
2. Make sure it does NOT have a live torch (I don’t think any of the Clarke ones do). These are dangerous as they will arc when they come into contact with the car body (even if you haven’t pulled the trigger!).
When I first had a go, I tried using gas and gasless. I reckon the gas gives a cleaner weld. The gasless wire is a bit messy and you have to keep cleaning up the weld area due to the residue left from the flux. The advantage is that having no gas is one less thing to worry about as a beginner. Also, if you use gas, either be prepared to buy lots of little bottles of CO2 or CO2/Argon - cause they don't last long. The alternative is to buy/rent a bigger bottle.
Stuff you probably need:
1. MIG welder - obviously
. If you go for gas, some bottles of CO2 or CO2/Argon.
2. Reel of 0.6mm or 0.8mm wire for steel (gasless or "flux cored" wire if you gasless).
3. FIRE EXTINGUISHER – keep it handy at all times.
4. Welder’s helmet – as Rich says the auto-dim ones are best. Always wear it – “arc eye” is not fun!
5. Gauntlets and old clothes that cover all exposed skin.
6. Sheet of 18 gauge steel.
7. Weld Thru zinc primer – use it to spray bits of metal before you weld them on.
8. Welder’s clamp and magnet - or something else suitable for holding repair section in place before you spot weld it in.
9. Something to cut sheet metal with – tin snips or angle grinder with thin (e.g. 1mm) cutting discs. Also need the cutting discs to cut away all the rotten metal.
10, Angle grinder with 40 or 60 grit flap discs – much better for grinding off weld than a grinding disc.
11. Some cardboard and felt tip pens (e.g. cereal packets) – for making templates.
12. Some files for fettling repair sections to size.
13. Wire brush wheel for angle grinder to clean of old paint & rust – you need nice clean metal for good electrical connection. Also, always disconnect car battery before MIG welding,
I haven’t had to repair those suspension mounts on my car but it looks like a reasonably easy first welding job. I think it’s a common repair for P6s, so hopefully some other forum members can give you some tips???
Why not give it a go? As already said, after a few jobs, it will have paid for itself.