What is a torch height controller? (THC)

The purpose of the torch height controller is to maintain the correct distance between the torch and the workpiece during the welding or cutting process.

These controllers are essential to achieve accuracy and consistent quality in welding or cutting. They also help prevent excessive wear of the torch parts, which extends the life of the torch and reduces maintenance costs.

There are several types of torch height controllers, but generally they operate based on sensors and feedback mechanisms. Here are some common types of torch height controllers:

1. Distance sensor: A sensor detects the distance between the torch and the workpiece. If the distance changes, the height controller automatically adjusts the position of the torch to maintain the desired distance.

2. Plasma Arc Voltage (PAV) Controller: In plasma cutting, the height of the torch is often affected by the plasma arc voltage (PAV). A PAV controller measures the voltage and adjusts the height of the torch to keep the PAV within an optimal range.

3. Capacitive height sensor: This sensor measures the electrical capacitance between the torch and the workpiece, which changes as the distance changes. The height controller adjusts the torch height based on the measured capacitance.

4. Arc tracking systems: More advanced torch height controllers use cameras and image recognition technology to track the position of the welding arc. This allows the torch to adjust to any variations in the workpiece.

Using a torch height controller helps welders and operators produce a more consistent and higher quality weld or cut seam, especially on jobs where the workpiece is uneven or has variations in material thickness. These systems are valuable in industrial applications where precision, speed and reliability are critical.