Introduction
Arc welding is one of the most commonly used joining techniques in various industries, such as automotive, aerospace, and etc. Many people who are familiar with the welding process are aware of the traditional arc welding technique, which relies on a continuous-length arc, generated between two electrodes and the workpiece, to melt a filler rod as part of the welding process. However, there are two other types of arc welding that use high-frequency and high-voltage principles, known as high-frequency high voltage arc welding (HFHV AW) and high voltage pulse arc welding (HVP AW).
High Frequency High Voltage Arc Welding (HFHV AW)
HFHV AW is a type of arc welding that uses high-frequency and high-voltage to create a sustained arc between the workpiece and the electrode. A key feature of this type of welding is that it has the ability to focus the energy of the arc over a smaller area and create a deeper and narrower penetration. This is due to the fact that the high-frequency and high-voltage generates an arc that is heated more quickly and with higher temperatures when compared to traditional welding processes. This allows for a faster welding process, with less heat input and more efficient results.
The process begins by connecting the welding cable of the welding machine to the welding electrode. Then, a high-frequency oscillator is used to generate a high voltage signal that is connected to the welding cable. As the oscillator signals to the electrode, the high voltage that is passed through causes an arc to form between the electrode and the workpiece. This arc will then be used to melt the filler material and carry out the welding process.
High Voltage Pulse Arc Welding (HVP AW)
HVP AW is an advanced form of arc welding that employs high voltage pulse technology to generate an arc. In this process, a pulsed voltage waveform is applied between the electrode and the workpiece to initiate and sustain an arc. The advantages of this type of welding are similar to those of HFHV AW in that it offers faster welding speeds, with less heat input for deeper, more controlled penetrations.
The process starts by making a connection between the welding cable of the welding machine and the welding electrode. Then, the high voltage waveform between the welding cable and the welding electrode is generated by a controller. This waveform passes through the welding cable and creates a current that is directed towards the workpiece. When the high voltage waveform reaches the workpiece, an arc will be generated between the electrode and the workpiece, which allows for the melting of the filler material.
Conclusion
High-frequency high voltage arc welding and high voltage pulse arc welding are advanced welding techniques that use high-frequency and high-voltage principles to generate an arc between the welding electrode and the workpiece. These welding processes offer a number of benefits when compared to traditional welding processes, such as faster welding speeds and more efficient results. By using these welding techniques, manufacturers and engineers are able to gain greater control over their welding processes and achieve better results with less heat input.
