Step 6Battery Spoolgun - Flux Core Wirefeed
Cost: $75 and up.
see the entire DIY Battery SpoolGun instructable.
Wirefeed is very easy to use. A lot like a gluegun. Just point it at the pieces you want joined and pull the trigger.
Flux-core wire means you don't need a shielding gas cylinder. The fluxcore wire I've used has deposited very thin slag. Not much work to brush it off. Fluxcore wire costs $4/lb and up.
Cheap fluxcore wirefeed welders are abundant in hardware stores and used on craigslist.
For even less cost on ebay you can get a spoolgun and run it on car batteries. Old car batteries will put out as much current as a very expensive welder.
Control welding heat with distance from the gun to the weld. Close in is a short low resistance wire - more current and heat - melt it in. Further out - longer wire - more resistance - less heat and a puddle that builds up higher.
To weld stainless steel and aluminum you'll need shielding gas.
For ~$200 you can add a gas cylinder and regulator.
Different materials require different shielding gases.
Thin walled materials such as tubing require skill.
You must look up wire diameter, feed rate, and voltage to get a good weld and not burn holes.
You must look up and do everything exactly right to weld aluminum.
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This is an emergency fix to get you back to civilization where a nice, neat, strong repair can be made.
Everyone who wanders the earth, should know this particular skill.