Self mix Argoshield?

mercredi 3 décembre 2014

OK, sorry guys, but it's time for another stupid question.



I'm about to pull the trigger on a TokenTools MIG210S MIG/TIG/Stick machine, and am currently working out what to do about gas.



I'll be welding mostly mild steel with MIG to start with, which means I'll ideally need Argoshield, but might be able to get away with CO2. But I also want to learn TIG, which means I'll need straight Argon too.



I was planning to buy a bottle of Argoshield to start with, then pick up some Argon down the track when I get to learning TIG. However, I just watched a video on weldingtipsandtricks.com where he talked about using a Y-fitting to mix Argon and Helium 50/50 for welding aluminium.



That got me to thinking, has anyone investigated having a straight Argon bottle, and a straight CO2 bottle, and using a similar Y-fitting to make an "Argoshield-like" 75/25 mix on the fly? No doubt you'd need some check valves to stop bottle transfer when not welding, but with a regulator on each bottle it shouldn't be too hard to set the flow rates on each for a close enough mix.



Obvious advantage would be cheaper cost of CO2 bottle as opposed to second Argon bottle, but you could also have the option of using either straight CO2, or an Argon/CO2 mix depending on the job.



What am I missing??




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