About the TIG welder, there are many features, modes, and parameters need to be considered. One of the most important technologies is the arc initiation method in the TIG welding. There are three types of arc initiation methods for TIG welding: scratch start, lift start, and high-frequency.
The scratch start method is the traditional arc starting in welding. The TIG tungsten electrode is scratched to initiate the arc, and must be quickly lifted off to prevent it sticking, but cannot lifted too far to avoid extinguishing the arc. So, the scratch start method is not very user-friendly, it needs a lot of practice for beginners.
What is Lift Start Method in TIG Welding?
The Lift start is an advanced starting technique in TIG welding that is used to improve the quality of welds and reduce the risk of contamination.
With Lift start method to start the arc, the tungsten electrode is touched the surface and lifted off. Because the start-up current is very low, there is no risk of contamination. Also, the tungsten is then easily lifted off. When the machine senses that the contact is broken and begins supplying full welding current.
This starting method has completely replaced scratch start due to ease of use and better performance.
What is HF Start Method in TIG Welding?
HF (high frequency) start is the touchless TIG welding technique for arc initiation. It allows the operator to position the tungsten electrode near the surface, and just press the foot pedal or finger switch to start the arc. HF arc starting also is the most user-friendly method.
The HF start method provides a much faster and more reliable arc starting than traditional scratch arc starting technique. It also minimizes the risks associated with TIG welding, including accidental short circuits and misfires, as well as reducing spatter from occurring when starting an arc.
HF start method provides many advantages, but it has limitation in special scenario. The high-frequency emits “electrical noise” that interferes with electronically sensitive devices, such as televisions, phones, radios, computers, or signal amplifiers. If you are welding near sensitive devices, should choose Lift TIG instead of HF start.
Conclusion
Compared with traditional scratch start method, Lift and HF start is a valuable welding technique that offers several advantages, such as improved arc starting and stability, reduced risk of contamination, improved weld precision and accuracy.
The TIG welding machines are provided by Hifa electric support both lift and HF functions, allow the operator to choose between lift or HF start based on the situation and requirements.