Principle of welding machine

‌The working principle of the welding machine is mainly based on the arc phenomenon, which melts and connects metal materials by generating a high-temperature arc. ‌Electric welding machines can use different power supply types, including AC power supply and DC power supply. The voltage and current of the AC power supply will change over time, while the DC power supply remains stable. The arc temperature and energy generated by the AC power supply are generally low, while the DC power supply can generate a stronger arc, making the welding effect more stable and efficient. 

Principles of different types of welding machines
‌AC welding machine‌: It is essentially a special step-down transformer that obtains welding currents of different sizes by changing the length of the reactor air gap. During welding, the electrode and the weldment contact to produce a short circuit, and the current generates heat at the contact point, followed by the formation of an arc, melting the electrode and the weldment.
‌DC welding machine‌: First, the AC power is rectified and filtered into DC power, and then it is inverted into medium-high frequency low-voltage AC power through a high-power thyristor, and finally rectified to output a stable DC current. This design improves welding performance and dynamic response speed.
‌Argon arc welding machine‌: uses industrial tungsten or active tungsten as the infusible electrode and inert gas (such as argon) as the shielding gas. The argon arc welding machine achieves stability and control of the welding process through the control circuit and gas supply system.
Application fields of welding machines
Welding machines are widely used in the welding of various metal materials, including carbon steel, stainless steel, aluminum alloy, etc. Different types of welding machines are suitable for different materials and welding requirements. For example, AC welding machines are suitable for general metal welding, while argon arc welding machines are suitable for occasions requiring high-quality welding.

By understanding the working principle and application fields of welding machines, you can better select and use suitable welding equipment to ensure welding quality and efficiency.