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Cooperation furthers innovative brazing solutions

SWEP UK Representation by Dover Intercompany Services UK Ltd News and PR from SWEP UK Representation by Dover Intercompany Services UK Ltd - Published 11 October 2016 What happens when two companies decide to work together and share findings and innovations? SWEP and Höganäs know: New and improved products that can benefit all kinds of industries!
The 11th International Conference on Brazing, High Temperature Brazing and Diffusion Bonding brought together the professional world of joining technology in Aachen, from June 7 to 9, 2016. Present at the conference were Ulrika Persson from Höganäs and Niclas Bornegård from SWEP. Their joint paper, called 'New nickel based brazing alloy suitable for very corrosive environments', was awarded a prize for best presentation. The paper differed from many of the other papers which were more academic in nature. Instead, the SWEP/Höganäs paper describes a real case, presenting the development process and highlighting the importance of cooperation and openness to further innovative ideas.

SWEP has been working with Höganäs the last ten years or so, and together they have developed a number of innovative brazing solutions to meet customer needs. SWEP is a company at the forefront of brazed plate heat exchanger (BPHE) technology, offering a wide range of products that allows you to optimize the use of energy, material, and space in your heating and cooling systems. Höganäs was established in 1797 as a coal mining company, but is today a modern, forward-thinking enterprise with a focus on metal powders for a variety of industries, among them brazed plate heat exchangers and the automotive industry. Both companies are based in southwestern Sweden, but cater to a global market.

The case presented came from one of SWEP’s customers. It dealt with a new application for plate heat exchangers used in cooling units that were subjected to a very aggressive coolant. That meant that both base material and brazing alloy needed to have very high corrosion resistance to the coolant. High alloyed austenitic stainless steel was early identified as the preferred base material, meeting the required properties. The only existing braze material with good enough corrosion resistance was BrazeLet® Ni613, but what looked good on paper could not handle reality. When testing the alloy, it was recognized that its melting range was not compatible with the base material used.

The requirements were tough, but clear. High alloyed austenitic stainless steel may form intermetallic phases during cooling and to avoid this, the material needs a special heat treatment. The melting range of the Ni613 was too low. Secondly, it was desired that the brazing alloy be as close to the chemistry of the base material as possible in order to minimize element migration between the two. Thirdly, Silicon, Boron and Phosphorus should be kept low since they consume Chromium. After listing these requirements, everyone involved realized that they needed to develop a new brazing alloy.
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The requirements were tough, but clear

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