Hello - Our shop inherited a Miller Syncrowave 250DX (air cooled) and we are new to TIG welding, but are experienced stick, mig...etc. We have read the manuals and a lot of general stuff from Miller, but we wanted to hear from experienced welders about general setup. Can someone let us know what is a good machine setup for practicing beads on 1/8" Aluminum plate? We have 100% Argon. Not sure what amperage or tungsten would be best to get our feet wet. Also, I assume that the "AC" setting is what we should be set at on the machine. Thanks for any and all advice!
crwnsvn
If you are going to do any significant amount of aluminum welding, you will want to ditch the 17 torch for something water cooled. I use a CK #20 on mine with a dynaflux cooler that I picked up cheap on Craig's List. I agree with Terry and I like to go with a 1/8th tungsten. I use 2% lanthanated (blue band). Set polarity to AC, set process to TIG, set amperage control to remote, set contactor to remote, set the HF start to continuous, I start with balance on #7, set post flow to around 30 seconds, set your amps around 150, leave the pulse and spot timer off.
30 sec post flow for 150-200 amps Is way over kill, more like 8 sec if that on a 17 torch and 5 seconds or less on wp20. Make sure ur balance is 6 or higher.
I like 2% lanthanated tungsten, 1/8" or 3/32" for aluminum on mine. If yours is a fairly new unit like mine, your AC balance knob will have a green line at around 65% EN, which is a good place to start. Don't sneak up on the heat on aluminum, you want to form a puddle fairly fast, then back off as the plate gets hot. If you do much alum, you're gonna want a water cooled torch. Good luck.
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