LAC welders
AUDIJIM at aol.com
AUDIJIM at aol.com
Fri Apr 23 18:50:38 EDT 2004
For a first time welder, I would suggest a GMAW with inert gas. My personal
welding stable includes a 220 VAC Miller 250. I use a 75/25 Argon/CO2 mix. If
you want to weld stainless steel, you need to use a tri-mix of Argon/CO2/
Helium. I have seen gasless/flux cored MIG welds and they look awful. Penetration
was lacking and that leads to poor strength at the weld point. Inert gas helps
penetration and also shields the weld from contaminates.
Another type of gas to use for just about everything is called Startgon or
Mastermix depending on your gas supplier. I have used this gas and the weld
quality is excellent.
GMAW is also one of the easiest welds to perform. After you get a MIG
machine, go to your local sheet metal shop and ask for some scrap metal to practice
with. Get all different gauge metal and start with steel first.
Aluminum welding is performed with a GMAW machine with a spool gun. The
aluminum wire is not strong enough to be pushed through a long run of the normal
MIG cable lead. So a gun is used that keeps the aluminum wire travel distance to
a minimum. Wire speed is increased and a typical example would be between
425-450 ipm (inches per minute) for 3/16" aluminum and running 140/150 amps and
using .035 wire. Compare that to welding 18 gauge steel using .035 wire. The
wire speed would be around 180-210 ipm at 90/110 amps. Pretty big difference.
Ciao,
Jim Furdyn (FAA certified aircraft welder)
///Audi5TurboTech
Cherry Hill, NJ
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