i am currently having a bash at tigging .8mm section mild steel cones for bike exhausts and are getting odd areas of blow holes in the welds,the steel is nice and clean,anybody advise me of what could be causing this?not using any filler at the moment just butt welding the sections together.also sometimes when striking the initial arc i am getting a real bright large area around the tungsten combined with a woooshing sound from the shroud almost like a firework before it settles down,this seems to coincide with the bad areas of weld .do i have something set wrong? thanks in advance.
- Thread starter valvieboy
- Start date
Correct! Although i dont go on there that much these days. I have a lot more in common with the guys here.
Possible you have a pre-gas setting on tig plant, hence whooshing sound when arcing up, may require a tweak to reduce too much pre gas flow?
If this is the case, too much initial gas can cause turbulence, dragging in outside environ into gas shielded area, while all this is going on, tungsten maybe getting pickup from the now contaminated molten steel???
Cheers....
