BRAZING
Currently at MGM srl these processes find spaces in manual procedures with certified staff according to the International Regulation UNI EN ISO 13585:2012 and in automatic procedures according to the International Regulation UNI EN ISO 14732:2013.
The joints are supervised and guarantee by the Brazing Procedure Specification (BPS) according the International Regulation UNI EN ISO 13134:2002 and validated through the supervision of Certified Welding Coordinators. As example, we list the type of joint according to the materials: Stainless Steels with Copper, Stainless Steels with Brass, Carbon Steels, Carbon Steels with Brass and Stainless Steels.
All base materials are guaranteed and certified according to the International Regulation for General technical supply conditions and accompanied by level 3.1 certificates. The welds are subjected to continuous periodic checks as required by the internal quality system through destructive and non-destructive testing sessions according to the current regulations.
Soft Brazing
It is characterized by the use of filler materials with melting temperatures lower than
450°C and by modest result of mechanical resistance.
Strong Brazing
It is characterized by the use of filler materials with melting temperatures lower than 450°C. depending on the required characteristics and the metals to be welded, various alloys can be used. Alloy silver based, copper and zinc with a melting temperature between 600°C and 700°C are used for the brazing of carbon steels and copper alloys. Copper is used for carbon steel and stainless steels brazing. For stainless steel brazing and alloys with high nickel level are also used nickel-based alloy.
Weld-brazing
It is characterized by the use of filler materials with melting temperatures higher than the Strong Brazing but in any case, lower than the melting point of the joint materials. Joints preparation is often similar to the autogenous welding. Commonly used alloys are melting brasses at relatively high temperatures (800°C). The process is not based on capillary attraction, but mainly on the atomic diffusion of the filler alloy in the intergranular structure of the base material.