When searching for trendy TIG welders or multi-process welders, you’re prone to come throughout a characteristic referred to as 2T/4T Mode. The 2T and 4T refer to 2 distinctly completely different modes of torch swap operation on a TIG welder. Should you’re new to welding, chances are you’ll not perceive what these options are and why they’re so invaluable. In brief, these modes have an effect on how the welder begins and stops the arc, offering flexibility and management to the welder.
The selection between 2T and 4T modes is determined by the precise welding job and the welder’s choice. 2T is less complicated and offers speedy management, whereas 4T gives enhanced management and reduces fatigue throughout longer welding classes. The worth of the 2T/4T options is the power to rapidly and conveniently swap between the 2 modes.
Right here’s a short rationalization adopted by a fast video that helps visualize the variations:
2T Mode (2-Contact)
In 2T mode, the operation is the less complicated of the 2 and includes simply two steps.
1. Press and maintain to start out – The welder presses the torch button to provoke the welding course of. When the button is pressed, the arc begins, and welding begins.
2. Launch to cease – The welder releases the button to cease the welding course of. When the button is launched, the arc extinguishes, and welding stops.
2T Mode is good for brief, fast welds. It’s helpful in conditions the place speedy management is important, similar to spot welding or tack welding. This mode is easy and is commonly used for shorter welds or when the operator prefers handbook management over the beginning and cease of the arc.
4T Mode (4-Contact)
4T mode is a extra advanced operate however gives higher management, particularly for longer welds.
1. First press – The operator presses the torch button to start out the arc. The button can then be launched whereas the arc stays on.
2. First launch – After urgent and releasing the button, the arc continues to remain on. This enables the welder to weld with out holding down the button constantly, decreasing finger fatigue.
3. Second press – To sign the top of the welding course of, the welder presses the button once more. This usually initiates a “downslope” interval, the place the present progressively decreases to keep away from creating craters or defects on the finish of the weld.
4. Second launch – Releasing the button after the second press utterly stops the arc, ending the weld.
4T Mode is advantageous for longer welds the place holding the button constantly can be tiring. It’s additionally most well-liked when a easy end is required, particularly in skilled and high-quality welding purposes.