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Smith gas mixer calibration

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1.5K views 3 replies 3 participants last post by  vpd66  
V
#1 ·
I have a Smith 2 gas mixer (argon/CO2) and was wondering who rebuilds or calibrates these? I know mine is off because if I put mine on 100% Argon my aluminum welds are contaminated. If I close my CO2 tank and have it on 100% argon then it welds aluminum perfect. So I know my mixer is allowing some CO2 in with the argon at 100% setting. These things are too expensive to toss and buy a new one. Someplace must work on these?
 
T
#2 · (Edited)
why are you mixing CO2 for aluminum?

ETA: re-read the statement, seems that isn't your intent. Have no knowledge of the mixers. Sounds more like a leak somewhere? Maybe not completely closing whatever valve/ meter on the CO2 side?
 
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