[PSUBS-MAILIST] Aluminum Welding Technique Question

[Steve McQueen via Personal_Submersibles]

I attempted some Aluminum welding this weekend.  I needed to tack 2
together pieces of a trolling motor mount I modified for my stern thruster.

I watched a video that said it is important to first first strike an arc on
DC+ for a few seconds to create a "ball" on the tungsten tip prior to going
back to the AC mode.

It was unclear in the video if the arc was being struck on an Aluminum
piece or the Steel welding table surface.  Does it matter?

Also they said the amp range should be set to 55-75.  Seem OK?

Thanks,
Steve
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