TPT July 2009

W elding: L atest D evelopments & M achinery

Brazing solution

Total Brazing Mix ™ , from FSH Group of France, is a brazing filler designed for manual and automatic brazing without the use of flux. This brazing filler metal is used in the automotive industry for aluminium units of heat exchangers in air conditioners, refrigerators, radiators and other heat exchangers. The resulting advantage is a constant and regular filler metal deposit for a given ring diameter, without breaking the wire. This is an important factor for the user and assured by a constant wire to flux ratio during the fabrication of the brazing rings and other possible pre-forms. The metal / flux ratio can be adapted according to the filler metal consumption requirements.

rod. By combining flux and filler metal in a mix, the dispensing process is shortened, resulting in both time and monetary savings and assuring a higher quality of brazed joints. A similar approach has also been adopted for other applications and alloys. Tubular brazing wires (TBW) and rods are made from seamless tubes of filler metal which permit no loss of flux and no moisture pick up. Exhaust pipes in 304L have been brazed with TBW 5040 rings of 42mm diameter, a ternary silver brazing filler metal without cadmium. The rings are perforated with micro-pores in order to assure an immediate and homogeneous flux effect.

 Pipes brazed to radiator fittings using Total Brazing Mix ™

As a result of the non-corrosive fluxes contained in the brazing wires, there is no post-braze cleaning required, and therefore nowastewater contamination, so decreasing the water treatment costs. The new brazing filler has also been used in heating element and cutting tool applications. FSH Welding Group – France Fax : +33 381 605 790 Email : p.orbana@fsh-welding.com Website : www.fsh-welding.com

TBW 5040

Ag Cu Zn Sn Metal / Flux

Composition (%)

40 30 28 2

93 / 7

These new tubular brazing products, TBW, with a constant metal to flux ratio, have reduced waste of both materials in the production process and ensured a better quality of joints for automotive users.

TBM 12 NC

Al

Si

Metal / Flux

Composition (%)

88

12

87 / 13

Traditional applications require first an application of flux paste then the wire or

86

J uly 2009

›

www.read-tpt.com