Knowledge Center
Trigger Modes (2T & 4T)
Trigger Modes (2T & 4T)
Understanding Trigger Modes
Trigger modes determine how your welding torch responds when you press the trigger button. The two primary modes are 2T (Two Touch) and 4T (Four Touch), each offering distinct advantages for different welding applications.
Selecting the appropriate trigger mode can significantly improve welding comfort, reduce fatigue, and enhance weld quality by providing the right level of control for your specific project requirements.
Trigger Mode Comparison
The 2T mode requires continuous pressure on the trigger throughout the welding process, offering immediate and direct control over the arc.
Operation Sequence
- Press trigger: Arc starts immediately
- Hold trigger: Welding continues at set parameters
- Release trigger: Arc stops immediately
Best Applications
- Short welds requiring precise control
- Tack welding operations
- Projects needing immediate start/stop capability
The 4T mode functions as a latch system, allowing welders to release the trigger during operation for hands-free welding, reducing hand fatigue during extended welding sessions.
Operation Sequence
- First press: Arc starts
- Release trigger: Welding continues without holding
- Second press: Begins arc shutdown sequence
- Release trigger: Arc stops completely
Best Applications
- Long seam welding projects
- Production work requiring consistency
- Applications where hand fatigue is a concern
Practical Applications
Each trigger mode excels in specific welding scenarios, offering advantages based on project requirements:
For detailed work requiring exact arc placement and immediate control, 2T mode provides the responsive handling needed to achieve precise results on intricate projects.
When working on repetitive, long welds in production environments, 4T mode reduces operator fatigue and maintains consistent parameters throughout extended welding sessions.
For welding in difficult-to-reach areas or awkward positions, 4T mode allows welders to focus on torch positioning without maintaining constant trigger pressure.
| Feature | 2T Mode | 4T Mode |
|---|---|---|
| Trigger Operation | Press and hold | Press and release (latching) |
| Hand Fatigue | Higher during long welds | Minimal (hands-free operation) |
| Control Type | Direct, immediate | Programmed, sequential |
| Learning Curve | Simple, intuitive | Requires practice for timing |
| Ideal Weld Length | Short to medium | Medium to long |
Key Points to Remember
- 2T mode provides immediate control with press-and-hold operation, ideal for short welds and precise work
- 4T mode offers hands-free welding with a latching mechanism, reducing fatigue during long welding sessions
- Select 2T for tack welding and applications requiring quick start/stop capability
- Choose 4T for production work, long seams, and situations where hand fatigue is a concern
- 4T mode requires practice to master the timing of trigger presses for optimal results
- Both modes have their place in professional welding applications based on specific project requirements