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shopmaster 300 mig tig conections

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  • shopmaster 300 mig tig conections

    Hello. I am new to the millerwelds forums and was hoping that someone here could give me some advice on some new some new parts I have recently acquired for my welder. I have a miller shopmaster 300 that I got used back in the 90's it came with a miller s21e wire feeder. I just picked up a miller hf-251d-1 high frequency unit, rfcs-14 foot pedal, coolmate 4 and a esab water cooled tig torch. I plan to put the hf unit and the coolmate on top of the shopmaster and build a platform above them to mount the feeder so everything will be on one cart. If anyone can see any drawbacks to this if you could point them out it would be much appreciated . Also I am wondering how I can wire both the hf unit and the feeder to the 14 pin connector on the front of the machine. It seems that it might be possible to wire both units to their respective pins on the same pug. Anybody know? I have never done any tig welding but learned to weld with a torch when I was a kid so I am hoping this experience will help me with tig. I am told that argon c 25 can not be used for tig but can straight argon be used for mig? It would be nice not to need two bottles of gas. Thanks in advance for any help you can give me.

  • #2
    Great unit, I used one daily at work for 4+ years.
    If you design your platform right it should work, it might make your mig whip a little high but that all depends on your setup and preferences.

    I wouldn't waste any time trying to wire both cables into the 14 pin plug, it takes seconds to switch them and you have to flip switches and do other stuff anyway, not like you can switch from one whip to the other and keep on going.

    Straight argon CAN be used for mig... but only if your welding aluminum. If you want to mig steel you'll need two tanks.
    at home:
    2012 325 Trailblazer EFI with Excel power
    2007 302 Trailblazer with the Robin SOLD
    2008 Suitcase 12RC
    Spoolmatic 30A
    2009 Dynasty 200DX
    2000 XMT 304
    2008 Thermal Dynamics Cutmaster 52
    Sold:MM 251
    Sold:CST 280

    at work:
    Invision 350MP
    Dynasty 350
    Millermatic 350P
    Retired:Shopmaster 300 with a HF-251