Porosity 2 questions ?

[Paul-n]

It looks good to me. Mind you, that's not saying very much

I think I am in the same boat

 

[Paul-n]

If you can rule out the material then beyond there being the wrong gas in the bottle it has to be a leak. I've had welds look very similar to yours and it turned out to be a leak between the machine and torch connection. If it's the old style r-tech from before they started putting a proper gas connector on the front I'd be looking at that.

Lemo

It looks like this , it went back for a problem and they said they had not seen one that old !

Paul

 

[zeppelin builder]

Hi all

Only an amateur with a R-tech dc160 doing welds good enough for me and have not had one fail yet building whilst 2 + 3 wheeled pedal machines.

Me in the lead somewhere in Holland..

I had some problems with porosity that I tracked down to poor tungsten treatment post gas was not on long enough letting the tungsten get dirty and I was not stopping immediately if I dipped it orbrushed it with the filler.

Q1) However I have noticed whilst the tungsten in the gas shroud is now clean when I go to sharpen it , there is a dirty dark band where it is gripped in the collet ?

Is that normal ?

Q2) I have some acquired 6mm steel it had a gold finish looking more like anodising but grittier , I ground it back to shiny and have had a devils own job welding it.
Very porous welds and when welding there is a blue/purple haze on the edges of the arc area ?

Ideas/advice very welcome

Paul

sounds like zinc coating
best avoided even with it ground off it may be embedded inthe plate
dont worry too much àbout the tungsten being discouloured at the collet area may be poor heat transfer