Re: [DMCForum] GTAW and "Heli-arc"

[Jim Strickland <ihaveanaccount@xxxxxxxx>]

On Wed, 28 Apr 2004 05:00:53 -0000 "checksix3" <jetjock11@xxxxxxxx>
writes:

...
> You need AC current to weld aluminum 
> no matter what gas you use, it's the positive part of the cycle that 
> breaks up the oxides. Pure tungsten electrodes are only used for AC 
> and aluminum welding, not for ferrous metals. 
...


That's not exactly true, there does exist aluminum rod for reverse
polarity shielded metal arc welding (DC SMAW).  It makes a pretty shoddy
bead though.



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