One of the crucial things you be told when you have a small Miller Dynasty 200 a/c d/c inverter Tig welder is how you can work on thick aluminum castings with much less amperage. I’ve had the chance to weld with two common Tig welding inverters, which can be able to Tig welding aluminum using 115v or 230v energy; the Miller Dynasty 200dx and the Lincoln Invertec v205t.
Each machine is a prime quality energy resource, however. Either one of those welding machines is restricted to around 200 amps output. Being limited to 200 amps makes you weld smarter and no longer warmer. As a substitute for simply atmosphere the amperage to 275 and plowing forward like you possibly can on a heavy responsibility Tig Welding Gadget, it’s a must to use your head.
Preheating thick aluminum portions is a confirmed option to scale back the amperage required to weld. However, when you find yourself for your storage and should not have to get right of entry to a warmth deal with a furnace or oxy-fuel torch, how do you preheat? Neatly, listed below are a couple of tips I’ve discovered:
Use a fuel grill.
However, ensure the aluminum section is welded and no longer includes anything destructive that will taint the burgers. Chances are you’ll wish to prepare dinner the subsequent week. (It could, in turn,h be a good suggestion to have an inexpensive grill devoted to preheating aluminum portions)
Wrap the section in aluminum foil and position it at the range of medium warmth until the warmth conducts in the area. (About one or two beers later, the section shall be heat sufficient to weld)
Use a small propane torch and keep it shifting till the section is scorching sufficient. (Simply scorching acceptable to sizzle spit will have to be adequate.)
Every other tip for decreasing the amperage had to Tig weld aluminum is to use a 50/50 or 80/20 argon/helium fuel combine.
The added helium makes a distinction. No longer handiest will you wish to have much less amperage. However, aluminum will puddle faster and be cleaner than natural argon. Believe me on this one!
Finally, I like to recommend the use of as small a Tig cup as conceivable. Some other people confer with them as Tig welding nozzles; however, in the end,d it’s the ceramic tip that is going at the finish of the Tig torch that directs the shielding fuel to the weld and protects the tungsten electrode from being oxidized.
The use of a small Tig cup calls for much less shielding fuel. For instance, a #7 cup would possibly require 15-20 cfh while a #4 cup will handiest require 8-10 cfh. That much less fuel blowing at the section makes a large distinction within the amperage required.
Along with this, the arc power dissipated within the type of cathodic etching (also known as cleansing motion) will help the handiest pass the place there’s fuel shielding, so there’s other arc power to be had to be targeted on the weld puddle.
I reminded myself of these kinds of pointers simply closing evening once I welded a 4-inch machined ingot of 6061 aluminum using a Miller Dynasty 200 amp Tig welding inverter. I had to change some subject materials that were miscut through a system store on a prototype section with numerous machining times.
I used the precise welding pointers I discussed previously in this article: I positioned the team at the range and preheated it to around 200 F (precisely one beer). I used a 50-50 argon/helium combine and a three/32 dia thoriated electrode with a #4 ceramic Tig nozzle.
I used to be shocked once I handiest wanted about 170 amps to perform the task, even supposing the section used to be beautiful large.