Grainy AL welds
Posted: Fri Dec 21, 2018 1:14 am
Guaranteed I'm not the first person to post with a problem with grainy looking AL welds.
I'm doing these aluminum frames from 1" x 1/4" 6061. Tricky welds because the welds themselves are only about an inch long and then you're off the end.
Found a neat trick to prevent blowout though: weld from the outside in. Then there's some meat to absorb the heat.
Anyway... all was going well and then all of a sudden I'm getting a grainy bead. Don't know why. Continued anyway. It's not like these welds have any structural requirements.
But what's up with this?
I'm running my PT185 at 185 amps, 1/8" red tungsten, 50/50 cleaning/penetration, 100% argon, no pulse, 3/32" 4043 filler rod and I'm going from corner to corner to allow the material to cool down. I'm not welding how or preheated AL. It's room temperature when I start each weld.
I'm stomping on that food pedal and adding filler rod almost immediately. I'm not massaging the piece with low amps. I'm just going for it.
I am in a slightly sometimes breezy room. But I don't remember feeling a draft. Could have missed it.
I'll post some shots tomorrow when I have my camera to hand.
But any ideas in the meantime would be appreciated.
Thanks as always.
Jon
I'm doing these aluminum frames from 1" x 1/4" 6061. Tricky welds because the welds themselves are only about an inch long and then you're off the end.
Found a neat trick to prevent blowout though: weld from the outside in. Then there's some meat to absorb the heat.
Anyway... all was going well and then all of a sudden I'm getting a grainy bead. Don't know why. Continued anyway. It's not like these welds have any structural requirements.
But what's up with this?
I'm running my PT185 at 185 amps, 1/8" red tungsten, 50/50 cleaning/penetration, 100% argon, no pulse, 3/32" 4043 filler rod and I'm going from corner to corner to allow the material to cool down. I'm not welding how or preheated AL. It's room temperature when I start each weld.
I'm stomping on that food pedal and adding filler rod almost immediately. I'm not massaging the piece with low amps. I'm just going for it.
I am in a slightly sometimes breezy room. But I don't remember feeling a draft. Could have missed it.
I'll post some shots tomorrow when I have my camera to hand.
But any ideas in the meantime would be appreciated.
Thanks as always.
Jon