GMAW process using STT (Surface Tension Transfer) machine will this transfer mode be categorized in transfer modes in QW-409.2 ASME IX

Thanks

STT? Never heard of.
Sounds like short circuit for me.
DK

deckyantoni,
Dr K is correct - STT is Short Circuit Transfer Mode,
Regards,
BB

Yes short circuiting. it stated also in literature of Lincoln who invented it.
Mauro

Surface Tension Transfer(STT) welding is a GMAW,controlled short circuit transfer process developed and
patented by The Lincoln Electric Company.It indeed can be categorized into the short-arc mode in QW-409.2 ASME IX.

Unlike standard CV GMAW machines, the STT machine has no voltage control knob.STT uses current controls to adjust the heat independent of wire feed speed, so changes in electrode
extension do not affect heat. The STT process makes welds that require low heat input much easier without overheating or burning through, and distortion is minimized. Spatter and fumes are reduced because the electrode is not overheated–even with larger diameter wires and 100% CO2 shielding gas. This gas and wire combination lowers consumable costs.