Hi there,
these days I am pushing 150A current limit on my stainless steel tube roll forming line.
The welder machine is inverter based 250A machine, with;
Alumina Cup size 6
tungsten size 2.4mm (3/32")
Argon flow 10 lit/min (more than 20 Cfh)
everything is fine below 150 amperes, but just beyond this limit they all go wrong;
the arc sound changes,
the arc brightness changes,
tungsten tip starts melting,
cup gets overheated and starts glowing and after a while the arc blows.
According to the Millers handbook, my parameters are normal except that it suggests using cup size 8, but my question is: is it just about a bigger cup size which would make such a difference?
these days I am pushing 150A current limit on my stainless steel tube roll forming line.
The welder machine is inverter based 250A machine, with;
Alumina Cup size 6
tungsten size 2.4mm (3/32")
Argon flow 10 lit/min (more than 20 Cfh)
everything is fine below 150 amperes, but just beyond this limit they all go wrong;
the arc sound changes,
the arc brightness changes,
tungsten tip starts melting,
cup gets overheated and starts glowing and after a while the arc blows.
According to the Millers handbook, my parameters are normal except that it suggests using cup size 8, but my question is: is it just about a bigger cup size which would make such a difference?