What is mig brazing?

Answer 1

MIG brazing is similar to MIG welding but instead of steel filler wire bronze wire is used instead (usually aluminium bronze or silicon bronze depending on the application).

Unlike true welding processes the parent metal does not melt and the filler metal doesn't significantly penetrate into the weld unless it is set up with a gap or groove.

The main advantage of MIG brazing is that the temperatures involved are significantly lower (usually below the melting point of the parent metal) , this reduces distortion and other problems caused by the melting of the parent metal. For this reason it's principal industrial application is in the fabrication and repair of light gauge high strength steel, particularly the new generation of high strength steels which are becoming more widely used in the automotive industry. These can be problematic to weld using other methods which involve higher temperatures and the melting of the parent metal.

Other applications include the joining of unknown and dissimilar metals, galvanised steel and copper and its alloys.

Although it is based on the standard MIG process best results are achieved with electronically controlled machines which have a specific brazing setting. A similar process can be carried out with standard DC TIG equipment.