My wife just bought a mig welder for me as an anniversary gift. How cool is that??!! It's a Lincoln 135. The manual says that you can use pure CO2 as shielding gas, but all of the welding bottles for sale seems to be for Argon/CO2 mix. Does anyone run just CO2? Also, anyone have a good source for used bottles (say 40cf)? Many thanks in advance,
Chuck
Chuck