[Shop-talk] Basic MIG Welding questions

[Charlie Schlismann]

--- On Mon, 2/2/09, Jim Stone <jandkstone99 at msn.com> wrote:

> Not as far as I can tell.  The owner's manual
> doesn't indicate anything about
> purging per se, but here's how it describes setting the
> gas flow rate:
> 
> Flow Adjust
> Flow rate should be set when gas is
> flowing through welding power
> source and welding gun. Open
> feedhead pressure assembly so
> that wire will not feed. Press gun
> trigger to start gas flow.
> 
> I could be wrong, but I assume that a purge valve could be
> used here, if the
> 140 had one.


I teach my welderettes (I've found women to be superior welders, once trained) to keep the feed roll pressure to a minimum.  Rollers slip when the wire hits a surface not connected to the work cable and gas purges the cablehose.  And absolutely no birdnesting of the wire.  As always, YMMV.

Charlie

#71 MiDiv F500