just a few pointers if you would humour me Have brought a AC/DC pulsed tig
What effect does ac frequency have adjustable between 20 and 100 hz where should I start and what would the suggested pulse rate be for 2mm alu
this is all for practice at current time just want somewhere to start and then improve all normal safety measures in place I normally use mig for alu but I like the politeness of tig
Thanks Andrew
AC frequency affects the focus of the arc. The higher the frequency, the more an AC arc behaves like a DC arc. So maxing out the frequency would make inside corner welds much easier, since the AC arc would no longer bounce back and forth between the pieces, but would instead focus into a narrow arc down the middle.
Increasing the frequency does slightly reduce the heat input per amp, so you will get more heat per amp at lower frequencies than high frequencies, but the heat will be more focused into the middle so it should more than cancel out that effect.
Running a very high AC frequency also reduces the heat affecting the tungsten, so you can grind the tungsten to a point for AC and get even more focus.
Thanks an explanation I can understand
Me too, a great explanation, I am starting to print off Ernies posts, they are a Godsend to a newbie like me.
I am currently teaching at the Divers Institute. I agreed to go back this spring to teaching evenings at South Seattle. As to how long I stay at South Seattle, that is still in the air.
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