FAQ's microplasma and plasma-arc welding process:

What is plasma-arc welding and how is it different from TIG short time welding?

In Plasma-arc welding the welding- or main arc between the tungsten electrode and the workpiece is necked by an additional water-cooled plasma nozzle. Hence the diameter of the arc is decreased compared to the TIG-arc and the energy density is increased at the same time. With the same seam depth, the width of the weld seam is much smaller than with TIG-welding, which leads to less deformation and less additional mechanical work. The stability of the plasma-arc is higher than that of the TIG-arc. This results in the high quality of plasma-arc welding seams, which usually are smooth, have low pore formation and high density.

Sometimes plasma-arc welding offers solutions where other processes have failed because of materials which tend to tear or form pores.
When do we speak of microplasma welding?
Microplasma welding is the area of plasma welding where the welding current is below 25 A and can be adjusted very precisely and steadily.
Are the plasmaJET units equipped for microplasma welding?
Yes, the plasmaJET50, plasmaJET 100, and plasmaJET 100SPS units can switch between microplasma and plasma welding.
Which are the advantages of plasma-arc welding for deposition welding?
The high stability of the plasma arc and the precise and repeatable adjusting of welding parameters present ideal conditions for deposition welding. Especially concerning very demanding repairs , such as those of delicate die edges, plasma deposition welding is by far superior to other methods!

The deposited material is supplied either manually as a rod or mechanically as a continuous wire with a wire feeder. For plasma powder deposition welding, the additional material is supplied to the plasma arc completely mechanical via the torch. Mixture with the basic material only happens to a very low degree.
Brazing and soldering with the plasma-arc?
The easily adjustable heat insertion by the plasma arc can be used quite well for brazing and soldering. A plasma soldering torch, where the arc is indirectly transferred to the workpiece, is used for soldering. The arc only burns between the electrode and the torch’s plasma nozzle, the work piece is floating. The plasma arc is pressed through the nozzle by the pilot gas and thus reaches the solder connection.

The “standard” plasma welding torch is used for brazing. The workpiece is polarized “+”. The brazing solder is supplied to the solder connection manually or with a cold wire feeder. On important area of use is the soldering of galvanized tin for the car industry.
Plasma spot welding vs. resistance spot welding
The use of the plasma spot welding method might be of interest if resistance spot welding didn’t bring the expected results because of the material’s accessibility or the effect of shunt in indirect spot welding. The pieces which are to be connected are brought into an overlapping position. Then they are pressed together by the plasma welding torch and the automatic welding process begins. The plasma spot welding process can be carried out manually as well as automatically.
Melting glass materials with the plasma arc
It is also possible to refound non-conductive materials with the indirect plasma arc. Today soldering torches with up to 2 kW are available as standard.