Plasma Welding Process

MICROPLASMA ARC WELDING SYSTEM 

The plasma welding process was first introduced to the welding industry about 45 years back. In microplasma welding, the current range is from 0.1Amps to 50Amps which makes it most suitable welding process for very thin sheet welding application such as bellows manufacturing, jewellery manufacturing, thermocouple junction welding, bulk filament welding & surgical instruments. 

HOW PLASMA WELDING MACHINE WORKS 

A plasma gas (normally argon) is heated to extremely high temp. between the copper nozzle & tungsten electrode & is ionized so that it becomes conductive media. This plasma arc is constricted by the construction of the nozzle & due to the pressure of inert argon gas, it comes out of the nozzle orifice. This is known as a pilot arc & it remains in the torch until the machine is in ON mode.

Welding machine at Electroplasma

When the torch is taken to the workpiece & the pilot arc is touched to the job this arc is transferred to the metal to be welded & the main arc is established between the tungsten electrode & workpiece. During the entire welding process, the pilot arc also remains at the background which gives the arc stability during the plasma welding process. The torch also uses the secondary gas i.e. argon, argon + hydrogen or helium which assist in shielding the molten weld puddle, thus minimizing the oxidation of weld joint.  

PLASMA WELDING SYSTEM / KEYHOLE PLASMA WELDING 

Normally the welding current range for plasma welding or keyhole plasma welding starts at 50Amps or above. At higher currents, because of the constructed arc, the plasma arc is stiffer. Plasma gas flow rate can be increased to improve the weld pull penetration. Normally the Tig welding arc flares at the job but plasma welding arc remains columnar which gives more welding speed, low distortion & better penetration as compared to Tig welding process. In keyhole plasma welding process, the plasma blows a hole through the joint or plate. Behind the hole, the molten metal flows together to fill the hole. Gravity, surface tension & gas pressure from the shielding gas causes this to take place. By the plasma keyhole process, we can weld I-butt joints in one single part up to the plate thickness of 8mm.

Contact today if you are looking for welding machine

This process has a minimum distortion due to the higher welding speed

To know more about Plasma Welding Machine

Electro Plasma Equipment Pvt. ltd.

104 Acme Industrial Park,

I. B. Patel Rd, Goregaon East,

Mumbai - 400063, India 

Tel.:  2240203456 / +91-22-2686 2843 / 93

Fax: +91-2226865065 

Email: sales@airplasma.com 

Visit Us: 

http://www.airplasma.com/