I live in Australia and I am using a new Sihio DC Inverter TIG WSM-200 which I believe is correctly connected.
I am having difficulties when I try to tig weld mild steel using 3/32" lanthanated tungsten electrodes. The tip of the electrode does not keep it's shape for more that a couple of minutes and become blunt and the arc then becomes unstable.
I am also getting a yellow powder stain around the weld. I am using argon shielding gas set at about 8 liters/minute and a no 8 alumina cup with the electrode protruding by about seven millimeters. I am using new clean 2mm mild steel fill in rod. The current is set to about 75 amps. I have tried reducing the current but the welding process is then painfully slow.
When I press the finger trigger on the torch I hear the noise of gas escaping and I am certainly using lot's of gas. However, is there any way of being sure the weld is being properly shielded.
I have watched demonstrations of the correct technique on UTube which I am carefully following. This is my first go at tig welding although I have considerable experience in straight forward oxy-acetylene welding.
Some of my early welds had a lot of pin holes and some slag formed on top of the weld similar to stick welding. I have scrapped these welds and I am starting all over again but want to avoid wasting time and materials as I have done up to now.
Your advice would certainly be appreciated as I getting very frustrated.
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