Welding speed

[Rick]

I'm welding 2mm thick stainless pipe. Back purge i'm guessing is ok because there nice and clean on the inside. However i'm struggling to get penetration because of the welding speed.

If i use 50-60 amp's i have to weld quickly otherwise the weld seems to go black, if i weld 2 quickly the weld goes black again, because it's still glowing as the torch (shielding gas) has moved.

I'm using a Lincoln Electric invertec welder.

I'm just about to buy another Lincoln AC DC welder, hopefully pulse will help me.

 

[Weldingartisan]

Too much heat input or not keeping the filler wire in the gas shield gave me the same results, if you can stand the abuse try UKwelder site! W/A

 

[snowcat]

I'm welding 2mm thick stainless pipe. Back purge i'm guessing is ok because there nice and clean on the inside. However i'm struggling to get penetration because of the welding speed.

If i use 50-60 amp's i have to weld quickly otherwise the weld seems to go black, if i weld 2 quickly the weld goes black again, because it's still glowing as the torch (shielding gas) has moved.

I'm using a Lincoln Electric invertec welder.

I'm just about to buy another Lincoln AC DC welder, hopefully pulse will help me.

could be incorrect gas flow rate... too much will cause problems.