Re: Crappy bead w/ Miller Spoolmatic 30A

Sounds like the Argon isn't reaching the nogas nozzle or is heavily
contaminated.
Have you;
1. checked for leaks?
2. measured the gas flow at the gun?

The soot either side of the bead is actually carbon deposit from decomp of
grease either on the wire or the job, and actually indicates at least some
gas is getting through.

What arc voltage and current are you running at?
A rule of thumb is Arc Volts=14+(Amps/20)

<Sierevello@xxxxxxx> wrote in message
news:1156826908.375968.59940@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I tried tacking some ears onto a Muncie transmission with my Spoolmatic
30A that is running off my Millermatic 250/ meters mig. I meticulously
cleaned both the tranmission and also the 6061-T6 ears. I have had the
gun for a year and just decided to hook it up. Gun is positive as per
the directions and ground is negative. 20cfh on the argon and a roll of
4043 in .035". Tip is correct and ground was good and I gave a
substantial preflow of argon before striking the arc. Gun at about 10
degees from veritcal and pushing.

Lots of smoke and a bead that looked like Mount St. Helens. Zero
penetration and a black soot on each side of the weld bead. The gun was
set as per the specs for 1/4" aluminum. The transmission is 365
aluminum and is quite weldable. The gas is good because it is the same
bottle I run off of my TIG machine.

I then tried it on an old scrap transmission after cleaning it also. I
got the same results.

Anybody have any idea what is going on here?

Any help or tips greatly appreciated.

Thanks, Steve



.

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