Miller Dynasty 200 DX water cooled

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I am considering purchaseing a 200dx model #951-139 watercolled ac/dc miller inverter based tig machine. I use a old school miller 330 at work. But they cut out the use of it for home projects, so now I need one to weld aluminum at home small fab projects/ repair on motorcycle partsI like the fact it has low power requirementsI want ot know if it can weld 1.5 x 2  inch rectangle tubing(.125 wall) to 1/2 inch thickby 2.5 inch wide by 8 inch long max 6061 platethis will be the biggest job I have planned for itthe dynasty 350 is about out of my price range, and do not want a old school transformer based machineanyone have a dx200 they can share there thoughts onthanksrobert
Reply:I have the Lincoln 205; the same machine in features/ capabilities. You will have no problem welding tubing with it. I do a lot of aluminum tube, from sched. 40, 1.5" pipe. The wall thickness is right around 3/16". I have welded several pieces to big base plates. I have very successfully welded decent size sections of 3/8" aluminum together with my machine many times. It's all about the prep work, and for the really big chunks, some preheat is key to success. Preheat with a Mapp torch, and then one last scrub with the wire brush. Contrary to what you might see online regarding penetration/ welding capability- the machine will do it's best with a frequency of about 80-90 for big/ thick aluminum. While you CAN theoretically get better penetration with a more focused arc, the fact is that you don't put enough heat into the surrounding parent material, and as such you really fight shrinkage and cracking in the welds, and the HAZ right next to the weld where the bead meets the base material. Also, you will find that with high amp welding on a very focused arc, the bead will not wet in and flow nearly as well as if the frequency were set a bit lower. I have repeatedly tried frequencies of 100-130 and find they do well on small parts, giving you a small bead, and low overall washing of the part with too much heat.And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.
Reply:I haven't had mine long enough to give you an informed response, but member "SundownIII" knows the 200dx backward and forward... maybe send him a PM.Miller Dynasty 200DXMillermatic 210 w/ Spoolmate 3035Hypertherm Powermax 380JD Squared Model 32Multiple fabrication tools & equipmentFull Powder Coating Setup
Reply:Originally Posted by robo2700I am considering purchaseing a 200dx model #951-139 watercolled ac/dc miller inverter based tig machine. I use a old school miller 330 at work. But they cut out the use of it for home projects, so now I need one to weld aluminum at home small fab projects/ repair on motorcycle partsI like the fact it has low power requirementsI want ot know if it can weld 1.5 x 2  inch rectangle tubing(.125 wall) to 1/2 inch thickby 2.5 inch wide by 8 inch long max 6061 platethis will be the biggest job I have planned for itthe dynasty 350 is about out of my price range, and do not want a old school transformer based machineanyone have a dx200 they can share there thoughts onthanksrobert
Reply:The dynasty 200 dx is up for thatV
Reply:The key will be preheating the heavier material. This should be done even when using a higher amperage welder. You probably don't have sufficient available power at home to operate a larger welder at rated capacity even if it was within your budget.