In strong brazing, they are used several kinds of alloys based on the materials to join or on the kinds of applications. The most used alloys are those based on silver, copper, and zinc with fusion points between about 600 and 900° C, and they are used for the welding of steels, copper alloys, and for many more material kinds.
The alloys based on silver have a fusion pint between about 500 and 600° C and they are mainly used in the refrigeration field, cooling, and automotive fields.
When it comes to using an alloy for the aluminum soldering characterized by lower temperatures, they are used alloys based on zin and aluminum that have a fusion point between 380 and 470° C.
A typical sample of the utilization of this kind of alloys is in the conditioning field, where the tubes thicknesses do not permit the utilization of alloys based on aluminum.
With this kind of alloy, it is also possible to make brazing copper-aluminum, radiators, or old brazed joints repairing.
Other kinds of alloys for strong brazing are: copper-phosphorus alloys, brass and copper alloys, and alloys based on silver.
Every operator, or brazing expert, has to well know the condition of the application he is facing, such as the operating temperature and the joint solicitations, in order to choose the most efficient and fitted filler material and soldering process.