Remove fuel tank
Disconnect battery.
Unplug ECU.
The Earth clamp should be as near as the welded joint as possible (Electricity will always take the easiest route).
Welded area needs to be stripped of paint, oil, grease etc. THOROUGHLY. You can burn it off but they'd need some intense heat which you don't want near your bike.
ALWAYS remove the part that needs repair if possible and take that to a welder. Most welders are NOT mechanics. Many mechanics can weld. Not all very well.
Steel is easier to weld. Aluminium needs specialist equipment/knowledge.
If the welder brings out an old Arc unit (basically a stick electrode in a clamp), then he's probably not a welder and just someone who'll have a go.
I'm a mechanic. I also went to college and got my welding qualifications. I weld a lot and take it seriously. But I'm still not the guy you'd call if you want a frame building from scratch etc. It's a professional trade and good work comes at a good price.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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