On Thu, Jul 27, 2000 at 01:01:12PM -0700, Rex Burkheimer wrote:
>
>
> Is this also true when MIG welding?
That contaminants can pollute the weld and cause splatter?
Yep.
Just like in painting, clean is good.
> >It is quite possible to
> > get contamination of the weld pool from the BACK side of the metal. Any
> oil
> > or grease or undercoat, etc back there can mess things up big time.
> >
> > Brandon Dixon
> >
> > -----Original Message-----
> > From: Bill Ruof [mailto:1953xk@home.com]
> > Sent: Thursday, July 27, 2000 8:22 AM
> > To: Steven Shipley; shop-talk@autox.team.net
> > Subject: Re: Question about TIG
> >
> >
> >
> > I have to add my two cents.
> >
> > Spatter is little BB's of metal. If you are getting a buildup of small
> > discrete balls of metal one possibility is that you are overcooking your
> > weld pool. The arc and the weld pool should be very smooth. No sparks or
> > flying metal.
> >
> > Take care not to contaminate the tungsten. Once you dip it in the weld
> pool
> > or jam the filler against it you've contaminated it and you will start to
> > get a buildup and degradation. Snapping off the contaminated part is OK
> but
> > you still want to grind to shape it. It is best to grind with a freshly
> > dressed wheel. Make sure you have a good point to start.
> >
> > Folks were also dead on the money about being sure that you are using the
> > right filler. Gas fillers have LOTS of deoxidizers and result in an
> > overactive weld pool if used for TIG welding. Trim your filler after a
> stop
> > and make sure it stays under the gas shielding while you're welding. If
> you
> > pull it out from the shielding while you're welding it will oxidize. When
> > you run that oxidized metal in, you destabilize the pool and the arc.
> >
> > The base metal probably isn't the problem if it is ground to bright metal.
> > You have to make sure to get out any pitting too.
> >
> > If all else fails recheck your gas lines and fittings to make sure you
> > aren't drawing in any air along the way.
> >
> > Welding is SO much fun.
> >
> > Bill Ruof
> >
> > > I've encountered a problem. I keep seeing a build-up of spatter
> > > that sticks to the electrode and the ceramic cup. As this spatter
> > > builds up the arc becomes harder to control. I'm spending a lot of
> > > time putting new points on the electrodes.
> >
--
Eric Murray http://www.lne.com/ericm ericm at lne.com PGP keyid:E03F65E5
Security consulting: secure protocols, security reviews, standards, smartcards.
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