I need to weld a threaded boss into a car exhaust system for an O2 sensor. The boss is stainless steel and the exhaust is stainless, however the wire in my MIG machine is for mild steel.
Question is will it weld? I'm not too concerned about corrosion as it will only be in for a few months whilst the engine is set up but would like some assurance as to whether it will even work?
If it will what gas should I be using? I currently have a CO2 and Argon mix.