I need to join a handful of short (18mm long) stubs of 6mm diam. stainless bar to another longer piece of bar - i.e. make a load of little butt joints. Elsewhere in the project I've made do with mig welding, but it's too rough for this - I'm sick of filing welds down, and holding in place will be really awkward.
So, I'm thinking of using the mig welder as a current source to resistance-weld these stubs on. A copper receptacle could be made to screw onto the torch end: this would hold most of a stub, allowing me to manually press the protruding end onto the other bar while passing a huge current through; no filler wire would be used. Hopefully the two would fuse together without too much distortion. It's not a structural joint but must be secure.
Before I give it a go, has anyone tried something similar, or got a trick for welding a nasty little joint like this?