Memmeddu
Member
- Messages
- 4,567
- Location
- Italia Sardegna
Happens to do those odd jobs too .I am really surprised about your experience with selco, I used a Lincoln electric v205 acdc(selco genesis in disguise) for the last 10 years which has never let me down, recently switched to a kemppi master tig mks2300 AC/DC which is a monster considering it’s only 230Amps ! I too weld loads of car rims some in really bad shape with chunks missing or very hard to get, with little preheat they go alright on my Lincoln !
I prefer high duty cycle at 100% which tells me how stable the machine is under stress ! I will give you a tip, don’t bother getting the puddle hot to bring dirt at the surface, instead push the molten metal with the rod trough the other side ! This way you don’t have ti deal with contamination and it’s easier to just cast clean metal in the crack this getting max fusion ! This is my welding rig that I currently use, can’t fault it !
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The only problem I have is that the welds I do have to have good mechanical properties without cooking the rim causing it to become very brittle.
After welding I put them on a rim straightening machine, and I have to straighten it .
This is very hard on the rim especially on Al Si 7 and 11 rims .
Al Si Mg rims if the weld is bad it just cracks open the welds at the first pressing manoeuvre .
Even when hot .
If heated too much it looses all its strength