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|Braze welding|

Baruzzi Saldature manufactures welded joints by manual and automatic braze welding, which is a fundamental process for heterogeneous joints, where the welding pieces are formed by different metals with a different melting temperature.

Braze welding doesn't bring the base materials to fusion, but brings them to a temperature which is lower than their melting point. Only the filler material is melt, and the temperatures involved are usually between 650 and 800 C.

Braze welding allows the joining of almost all metals and permits the realization of elastic and resistant joints. This process presents characteristics of autogenous welding and ordinary brazing: the first is the preparation of the borders, the material and the required equipment; braze welding characteristic is the use of a filler metal with a melting temperature which is lower than the base material one; it doesn't reach fusion but is only heated (as happens in autogenous welding).

Brazing, or capillary brazing is performed by Baruzzi Saldature with alloys for brazing containing cadmium and ecological alloys with cadmium absence.

Ecological alloys involved:

 

Welding alloy % Weight composition
Ag Cu Zn Others
5662 56 19 17 55n-3GA
5600 56 22 17 5 Sn
5507 55 21 22 2 Sn
4576 45 27 25,5 2,5 Sn
4076 40 30 28 2 Sn
3876 38 31 29 2 Sn
3476 34 36 27,5 2,5 Sn
2576 25 40 33 2 Sn
4404 44 30 26
3075 30 38 32
2500 25 40 35
2009 20 44 36
1875 18 46 36

 

Brazing is performed by fixing the base metal in order to leave a capillary space between the parts, then it is heated up to a lower temperature than its own melting but higher than the filler metal's temperature. Filler metal is put in contact with the base metal so that it melts and leaks between the joints, wetting them and forming the brazed joint. This joint is especially indicated to join lead, zinc, zinc iron, tin copper and tin-lead alloys.

Brazing are distinguished according to the lower o higher melting degree of the filler metal. Soft soldering are performed with a low melting temperature (<400C) welding alloy, while hard soldering are operated for joining metals and metallic alloys with a high melting temperature.

Braze welding on brass pipes Braze welding on brass pipes Braze welding on brass chain Braze welding on brass items Braze welding on brass shower arm Braze welding on brass handle


Samples of braze welding.