Porosity With Tig On Mild Steel.



more than likely your issue is polarity
 
I believe my polarity is positive earth, dont know if its ac or dc.
watching the videos right now
 
THATS BETTER....DID you check the internal polarity
 
Charl, thats for mig isnt it?
Just a note, I tried swapping the external earth lead over and the tig wont strike.
If the internal leads are swapped over as in the above video which was to allow gas less mig wont that screw up the tig weld?
How would I check the internal polarity? meter? exactly what kind?
The more I think the more I'm convinced its a gas problem.
I had a cig mig welder that had swarf inside the gas tap on the gun that prevented it from correctly working, once that was removed it was fine.
Even the replacement tap had the same problem.
When I get the time I will explore the total gas path and report back but am unsure exactly when. (too many irons in the fire)
 
zmotorsports said:
I think your culprit is the mill scale. TIG welding does not play well with the scale.

You could try some 309 or even some 308 S/S wire but plain ole ER70S-2 should work fine as long as the metal is bare and clean. I am not a fan of using S/S wire to mask an underlying issue, I use it where the weld or specs call for it.

Mike.
Click to expand...

Very well said. Unless I'm joining SS to CS the 309 stays put away. I guess there are some instances where you have to use SS but, that's the hail mary. I would rather know why the problems are arising.
 
It isnt the mill scale, it happens whether there is scale or not.
I still have to check out the total gas path for leaks or whatever.
 
Sounds like air in there, are u in wind ,fan ,drafts = not good, Stinger gas flow should put out lighter
2" away with Ar . That's what's I do ,
 
That's what it looks like when you've got galvanized or some kind of zinc coating. Even when you think you've ground it all off, there's still some impregnated down into the grain below shiny bright metal. Was there a garlic kind of odor with the weld ? And if there is any coating on the back side, it will wick thru even if you think you're not getting full penetration. That porosity looks like what you get when you dip the tungsten in aluminum ! Did you ever figure out the cause ?
 
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No not yet, too many other demands upon my time to strip the welder.
I will report back when I find out what it is.
This welder used to be very good for tig which is why I'm flummoxed at present.
 
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