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21st August 2011, 07:30 AM
#11
One other thing you should do is get a teflon liner for your mig gun (as Casper said). A standard liner that is used for mild steel wire is not very good and will cause wire feed fluctuations. I would also play around with your argon flow rate. Too much and you can draw in the surrounding oxygen and too little is just as bad. 20-30 cf/hour is good.
Another thing is to make sure that the mig tip is up inside the gas nozzle by about 1/8". Then make sure you have about 1/2-3/4" of an inch between the nozzle and alloy. When the planets aligned (feed, speed ,amps) you should hear a nice hissing sound and will be getting a nice spray transfer of molten alloy, with no shorting of the wire hitting the workpiece.
Hope this helps a bit.
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21st August 2011, 09:05 PM
#12
Thanks for all the advice!
I didn't get much time today but I did some more experimenting. Still didn't get any decent penetration of either piece of metal. I just kept building up material on the surface. I at least managed to stop getting metal blowing back onto the tip so I think my wire speed it getting closer to where it should be.
justfishing - I'm using a Trade Tools Direct MARS 180 - TradeTools. I can weld steel quite nicely with it so it can't be too bad.
So far wiring feeding hasn't been a problem. The wire comes out nice and consistently and hasn't got stuck.
Nothing to do but keep at it! Thanks again.
06 SE V6 Discovery 3
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21st August 2011, 10:45 PM
#13
You do have a good clamp for your earth wire.
I'm no welder so I will just put it out there for someone that knows to address. Do you have to change the polarity for aluminium compared to steel?
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