Called MSG (Metal Shielding Gas) brazing according to international standards – is a hard-soldering procedure. The electrical arc burns between the melting, continuously applied brazing wire electrode and the workpiece. The added shielding gas protects the arc and the liquid brazing metal against the influences of the ambient air. The application is as simple as MIG-MAG welding.
Only a fractional zinc melting loss occurs in the immediate brazing zone (zinc melts at 419° C, evaporates at 906° C) due to the low melting temperatures of the brazing wire (approximately 1000° C). The soldering seam features a high corrosion resistance and enables easier surface treatment.
The soldering wires consist of copper based alloy with a component of, for example, silicon or aluminium.
There is minimal distortion, even on very thin sheets, due to the low heat input. Coated (galvanised, phosphated, aluminised) and uncoated steel sheets, stainless steel and steel/stainless steel compounds (black/white compounds) may be soldered. Soldering seams provide excellent assembly strength.
Shielding gas pure argon or argon with minor additives.
Galvanised thin sheet is used in the automotive engineering and building industries, in air conditioning technology, household appliances and in the furniture industry. MIG brazing is ideal for these applications.