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  #11  
Old 07-01-2017, 12:33 AM
joemato joemato is offline
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Default Dcnp

I don't know anything about this but I know electricity. The AC going thru a
transformer would make a higher or lower voltage depending on the winding.
An recifier would change the sine wave into DC with straight line pattern. An
inverter changes DC to AC. I have one on my house that makes my solar panel
output into the AC my house runs on.
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  #12  
Old 07-01-2017, 04:44 PM
billfunk29 billfunk29 is offline
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Default Rectifier dc

Good point Kent, a rectifier isn't as flat as a motor generator.
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Old 01-11-2018, 10:38 AM
billfunk29 billfunk29 is offline
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Default DC on aluminum

I finally got time to fiddle with welding aluminum with the DC machine. Maxstar 200LX. The "LX" has tons of programability for pulse and ramps. I didn't use any of that for this test. It works pretty well on .05" 6061. I was using a 1/8" pure tungsten at `150 amps. More than enough power. On 1/8" thick material the tungsten burned off. My first attempt was with 1/16" filler. It was too much filler. The arc likes to wander more than AC. Need to keep a short arc. Seems to be very sensitive to conductivity. The arc will want to be all on one side of the joint. It took lots of motion to get the arc to go on both sides. While I am figuring this out, I blew a hole. Second try went better. Bottom line, you can weld aluminum with a DC supply.
DC aly weld.jpg
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  #14  
Old 01-15-2018, 07:45 PM
SWT Racing SWT Racing is offline
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Default

Quote:
Originally Posted by crystallographic View Post
Guys welding heavy (3/8") sections routinely use DC, either TIG or MIG.
DC very common when using 100++ amps .....
This. Using Helium as well. Great for buildup of large castings when you can't really preheat very well. . .though porosity can be a problem. And. . .if you think you're throwing filler metal in fast on AC, wait until you're welding aluminum on DC! You're basically doing a laywire technique, but still pushing the rod in.

I've only done it once, when one of my fabrication mentors showed us at work.
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