I replaced my original mig gun with a 20 foot long Profax brand 250 amp Lincoln/Tweco style and then changed the front end parts to use Lincoln/Tweco #23 insulated screw on nozzles and #14 contact tips. I believe the 250HD version comes with these parts.Originally Posted by av8or1
You can see in the pictures that the tapered contact tip has almost no face to absorb radiant head from the arc. Standard and heavy duty contact tips have a large face and absorb a lot of heat from the arc that can melt your gun. Through trial and error I've learned that the tapered contact tips work well for everything so that's all I buy now.
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On my 75/25 tank regulator I use about 2 feet of plain old 1/4" air line like you use with an air compressor with a 1/4" male quick connect. On the mig machine I use about one foot of the same air hose with a 1/4" female quick connect. The cheapest way to get this hose with ends on it is to buy a cheap 6 to 10 foot air hose and cut what you need off each end. The hose clamps are for automotive fuel injection. Regular worm drive clamps won't seal and cause problems. My mig gun and spool gun are in the pics. The spool gun is also a Lincoln/Tweco style and uses the same front end parts as my profax. The gas hose is setup the same way on my tig machine so I can put the carts side by side and connect pure argon to the mig machine for aluminum welding or mix gas with the tee for a higher argon content than 75/25 when I want to spray thin material. I would spray 3/16" steel using 75/25 with ease. Anything thinner I would add more argon. Bumble bees shouldn't be able to fly, but they do and do it well.
The 250p MIG, 250EX TIG and PP60 plasma cutter have been going strong for about 8 years now with no problems.
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