I use a dynasty 350 and just started a new box of 1/16? 2% orange band tungsten. I have the machine set at 125 amps, 70% balance, 140 en, 95 ep, 125 hz. Start up amps 40. Trying to do a fillet on 3/32 aluminum. Preflo .2-.4 sec, and post flow both automatic and 12 seconds with a flow of 14 on a gas lens. Tungsten is ground the correct way and leaving a small land on the end. Aluminum wire brushed with stainless, wiped with acetone. Start the arc and I immediately get contamination running all over, then the tungsten starts to ball and runs all over the place and as well, the arc runs all over the place. If I keep going for an inch or so, the ball seems to finally stabilize a little but droops to the down side. If I run a horizontal bead on the same stock, I see the tungsten start to split for a second or so but then it forms the ball and works ok. Never had the problem with my last box. It is a name brand private label from airgas. Tried two sticks and the same. Am I missing something or do you get bad tungsten from time to time.
Note: Edited as I just read and see I typed wrong aluminum thickness: It is 3/32" thick.
Note: Edited as I just read and see I typed wrong aluminum thickness: It is 3/32" thick.
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