August 7, 2022

Things to Keep in Mind while Buying Welding Machine for Plasma


Plasma welding machine employ an arc to melt areas before welding using a high-velocity, high-temperature ionized gas. Plasma welding is used to improve the control of the arc welding process at lower current levels. It has a high level of control and accuracy, allowing it to create high-quality welds in tiny or precise applications while still ensuring long electrode life for high-volume manufacturing.

Tungsten gas (TIG) welding is similar to plasma welding. The arc is created between the workpieces and the end of a small diameter tungsten electrode in both methods, but the electrode in plasma welding is positioned behind a fine bore copper nozzle in the torch. The arc is forced through the nozzle, forming plasma and a characteristic columnar jet.

Various Things to Look upon while buying a plasma arc welder are listed below :

  • Equipment: Brazing, cutting, soldering, and/or surfacing subsystems are all included in complete systems. A power source or station, a torch, iron, or gun, cables, feeders, and positioners, robots, and other necessary components are also included.

Welding power sources are another name for power stations. The output power required is sufficient to melt the material. Plasma welding is usually done with a DC power source with a drooping characteristic. For a given power supply setting, dropping, also known as constant current, will deliver practically constant current. This power source is perfect for mechanized welding since it maintains the current setting even when the arc length varies. Because approximately 1/3rf of the heat created by the arc is produced at the cathode and 2/3rds at the anode, negative polarity reduces the heat produced in the electrode.

The output current and power can be controlled by the machine’s controllers based on input sensor data, traverse speed, and torch location.

  • The Major Process: Three welding processes can be achieved by altering the bore diameter of the plasma welding nozzle. Microplasma arcs (.01 to 15A) – Microplasma arcs use very low welding currents. The needle-like stiff arc eliminates arc wander and distortion, making it ideal for welding thin sheets, wire, and mesh sections.

Because the plasma is confined, the arc is stiffer in medium current plasma welding (15A to 200A). This method offers a larger depth of penetration and is more resistant to surface contaminants, including coating. To guarantee that the torch performs consistently, the machinery used for medium current welding must be well-maintained.

  • Input Specifications: AC voltage and frequency are the input specifications. When combining an efficiently cooled torch with an AC power supply, a square wave AC (inverter, switched DC) makes the AC plasma process easier.
  • Output Specifications: When choosing plasma welding equipment, output power capabilities include numerous options that must be examined.

With an alternating current (AC) supply, the current output varies sinusoidally over time. With a direct current (DC) power supply, the DC output remains constant over time.

Choose a welder that can do the functions you need as well as the projects you’ll be working on the most. To attain the most successful and cost-efficient operating results for the projects you’re working on, keep in mind the varied amperage and power requirements, as well as the duty cycle. You should also consider the price of portable welding machine.