Pulse freq and width

[rebekah_harper]

Hiya all,

As I am improving I want to know more.

I have an R-tech 160 ac/dc.

On it I have pulse freq and width. I know what they do but want to know what I would use them for?

I am now getting decent welds on 1mm aluminium. And now moving onto 0.5mm. Not doing bad but getting blow through here and there. And the ends end to burn up.

So in addition to my question above. Would any one have any advice on the settings on a tig 160 so that I can weld the 0.5mm sheet.

One thing I have noticed is that the tungsten is pretty rough when I put a point on it.

Cheers guys

 

[Lawnmowerboy]

The pulse keeps the overall heat down but puts in enough to melt the dab of filler without over cooling the pool which is useful on thin stuff. Can also give a nicer looking weld. You set the top current as normal then the time at top current then the base current ant the time it's at it for. Frequency is just the cleaning cycle the rate at which it switches polarity. I don't usually move far off 65% changing this increases or decreases penetration and tungsten longevity. The width is how focused the pool is when welding. On thin stuff you don't want it too focused. If it spreads out more you are less likely to blow through. 0.5mm is bloody thin for ally.

 

[wheresmejumper]

Theres nothing wrong with stopping and letting the work cool for a bit.as lmb says that thickness, well thinness, is hard to work with