Lincoln STT Surface Tension Transfer Technology

Lincoln Electric’s STT Surface Tension Transfer process has been developed and patented to achieve good weld penetration with low heat input.

It is a GMAW (gas metal arc welding) short circuit transfer process, and the STT machine itself has no voltage knob – it uses current controls to adjust the heat independent of wire feed speed, ensuring changes in electrode extension do not remove heat from the bead. Good bead control and faster travel speeds can replace GTAW (gas tungsten arc welding) in many applications, without sacrificing appearance.

The STT also makes welds that require low heat input much easier – without overheating or burning through, weld distortion is therefore minimised. Good penetration at low heat input also makes it ideal for open roots, gaps or thin material.

Spatter and fumes are also reduced as the electrodes are not overheated, even with larger wire diameters and 100% Co2 gas – which in turn reduces consumable costs, the current is controlled to achieve optimum metal transfer.Lincoln Electric

Advantages of STT replacing short arc GMAW:

  • Reduces lack of fusion
  • Good puddle control
  • Consistent x-ray quality welds
  • Shorter training time
  • Lower fume and spatter production
  • Use of variable compositions of shielding gases
  • 100% Co2 on mild steel

Advantages of STT replacing GTAW

  • Four times faster
  • Vertical down welding
  • Shorter training time
  • 100% Co2 (mild steel)
  • Improved quality welds on stainless steel nickel alloys and mild steel
  • Consistent x-ray quality welds

See the below demonstration videos from Lincoln Electric to see the process in action and explain in further detail.


Westermans have in stock an STT and STT 11, click here for price and more details.

We can also offer a variety of used and new Lincoln Electric welding equipment, see the website for our current stock.

This entry was posted in New Stock, Videos, Westermans News. Bookmark the permalink.

Leave a Reply