Well, I finally broke down and bought my wife that MM210 unit she has been dying for, (with the spool gun option so she doesnt think that I am being cheap). The unit should be here in about 1 week or so.
My immediate question concerns the cylinder tanks. First, I have 2 older CO2 tanks that I used to use early on for pressurizing draft beer kegs for parties, personal use, etc. I beleive that both are old, ie, > 10 years, and are out of the certification range, hence not sure if they could be refilled. Do any of you guys know what it costs/is it worth it to have the tanks re "hydrotested/certified" (I think thats the right term). I believe they are 20 pound tanks.
Second, I have learned (much through this message board) that Argon, both straight for aluminum, and as a mix for steel is a good idea for a better quality weld. If I had 2 different tanks, would it make better (more economical, etc) to fill one with Argon, the other CO2 and connect both tanks to a regulator to mix the gas going to the gun to a 75/25 ratio for steel (and does this require a special regulator) and then have the fleibility to weld aluminum with just the argon tank, or should I have one tank filled with the premixed (I think this is the right term) 75/25 that they sell, and the other filled with straight argon?
Thanks - Ron - San Jose, California
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