May 10, 2022

Q&A – BRAZING: NEWS AND FUTURE SCENARIOS

  • What exactly are brazing alloys and what are they used for?

Brazing is a particular welding system, used to obtain hermetic, with very good mechanical properties and of excellent aesthetic appearance joints.

Brazing differs from welding by the fact that the base materials are not melted during the process, and by the fact that, by this system, it is possible to easily join together also different metals (e.g.: steel to copper, copper to brass, copper to aluminum, etc.).

Brazing alloys are usually available in a wide variety of chemical compositions and of presentation forms, in order to satisfy even the most stringent requirements.
It is possible, anyway, to group them in the following families:

Silver based alloys: used to join all metals, with the exception of aluminum and magnesium, they find their applications in many different sectors, such as general construction, refrigeration and air-conditioning industries, silverware and do-it-yourself.
Copper-phosphorus alloys: dedicated to the joining of copper and its alloys, they are widely used in the refrigeration and air-conditioning sector for the brazing of copper pipes and connections.

Aluminum alloys: used for the low temperature joining of aluminum.

Tin-based alloys: usually known as soft-solders, these alloys find the most applications in the electronic and electrotechnics sectors, as well as in the general construction.

 

  • Which parameters are needed for an optimal choice for the proper alloy to be used?

First it is necessary to identify the base metals which have to joined. After that it will be possible to select the most appropriate family of alloys to be used. Finally the exact alloy will be chosen considering the desired brazing temperature and fluidity.

It is here important to note that lower melting alloys possess higher fluidity and are usually easier to be used, being ideal for capillary brazing jobs.
Higher melting alloys, on the other hand, are less free-flowing and more suited for build-up and for filling of large joints.

 

  • When looking to the brazing alloy market, what is the main strength and advantage of Stella Welding Alloys compared to its competitors?

Stella Welding Alloys is always recognized for the very ample range of products that are offered to Customer. This includes not only the different alloy compositions, but also the complete line of presentation forms (rods, flux-coated rods, wires, strips, powders, pastes, rings and preforms).
In addition we can offer a very fast service without minimum order requirements for the major part of the offered products.

  • What is the most important industry news? What has Stella Welding Alloys done to remain updated ?

The most significant news has been the regulatory updates regarding the chemical substances used in the formulation of the brazing fluxes.
Since some years Stella Welding Alloys has been ahead of times, being today able to provide fluxes which do not contain substances considered of concern for the human health and for the environment.
Stella Welding Alloys, moreover keeps itself always on the cutting edge, by studying and implementing new alloys to satisfy the multiple and specific requests received from numerous Customers.

 

  • What do you see in the future of brazing alloys industry ?

In the coming years we will see, from one hand, the development of new alloys with reduced silver content while, from the other hand, it will become more and more important the compliance with increasingly stringent technical and environmental regulations on the existing products.
Both aspects will require additional research and development activities: Stella Welding Alloys is already dedicating considerable energy and commitment to these elements.