CO2 Welding? Home › Forums › Weld Forum › CO2 Welding? This topic has 0 replies, 1 voice, and was last updated 9 years, 2 months ago by admin. Viewing 1 post (of 1 total) Author Posts April 1, 2006 at 8:03 pm #110 adminKeymaster Ed I have read the info in your gas section, when is it beneficial to use straight CO2? Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In