More TIG and MIG welding machines are now featuring 2T and 4T as standard.
What is it? What are the differences?
Although 2T and 4T are identical on TIG or MIG welders there is a slight difference in their operation.
2T and 4T – What is it?
These modes have the “t” symbol for “touch” which refers to how many times you need to touch the torch trigger to initiate and stop welding.
2T is for “2 touches”. This is a two-touch setting. The welder must press the torch trigger to turn on and off, then release it to stop. This setting is ideal for quick welds.
4T is for “4 touches”. This setting is four-touch. To activate the welder, you simply need to release the trigger and press the button again. To stop 4T from activating, press and release the trigger. This is ideal for longer welding runs.
The TIG welders have an option to use the foot pedal, the 2T and 4T features. For those who need granular control, TIG welders still include foot pedals.
Standard equipment for MIG welders includes a torch trigger, so the 4T function is not an extra feature.
These settings allow welders to be more flexible in the way they approach each project.
There are many welder models that can offer 2T and 4-T settings. However, they all operate in different ways depending on whether they’re TIG or MIG.
What are the best times to use 2T and 4T modes?
The 2T and 4T modes offer many advantages to welders, just like other modes. It all depends on what type of work you are doing.
Shorter weld runs can be achieved with 2T. You can use 2T to tack weld, stitch weld or join small areas. 2T makes it easy to perform short welds quickly, making it easier to start and stop.
When you have to do longer weld runs, or when you need a trigger that is difficult to press, 4T is the best option. Concentration and sometimes stamina are required for long weld runs. This is made easier by the 4T mode so that you can concentrate on your weld.
2T vs. 4T in TIG Welding: How It Works
As an alternative to the foot pedal, TIG welders have the 2T and 4T features. The foot pedal lets you control the amperage, but the 2T or 4T function allows you to turn on and off the torch.
2T in TIG Welding
TIG welding with 2T is easy. To allow the machine to reach the set amperage, you can set the amperage. You can adjust the machine’s ramp-up or ramp-down times so that it doesn’t reach its set welding amperage immediately. This prevents the blow-through of thin metal.
To activate 2T, press and hold on to the trigger of the TIG torch. This will cause welding to start. Release the trigger to stop.
4T in TIG Welding
The 4T setting for TIG welding is a bit more complicated because you have complete control over each stage and the entire welding process.
You must set the “starting amperage” before you can start. This is the maximum amperage your TIG welding machine should operate at before it reaches its full working amperage. The benefit of 4T is that you can use it as a starting amperage to heat the metal and then increase your working amperage.
To activate the starting amp, press and hold the trigger on the torch. Release it to initiate the upslope to working amperage. You can now TIG weld, without having to touch the trigger. You can then release the trigger to end the arc by pressing the trigger once more to bring the slope down to the desired ending amperage.
MIG Welding: 2T vs. 4T – How it Works
The 2T and 4-T features in MIG welding are not meant to replace the TIG welder’s foot pedal. It’s designed to enhance the functionality of your MIG gun.
A MIG’s 2T and 4T functions are simpler than a TIG welder, as there isn’t any amperage to worry. Instead, you can set your wire speed and voltage. There are no downslope or upslope settings.
2T in MIG Welding
MIG welding does not have 2T as a function. It could be described as having no 2T function. To start welding, you press the trigger on your MIG gun and then release the trigger to stop.
4T in MIG Welding
MIG’s 4T function works in the same manner as TIG welding, but with no pre-starting settings. To start MIG welding, press the trigger and then release it again. This allows you to MIG weld longer without having to hold the trigger.