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When brazing stainless steel components using a stainless steel brazing alloy the risk for erosion caused by the melting point depressant elements used in the braze alloy is enhanced. As the braze alloys become more similar to the materials to be brazed the barrier blocking diffusion of light elements between the alloys is lowered. If enough diffusion takes place erosion or structural changes will destroy the properties of the stainless steel component. This is especially critical for designs using thin stainless steel sheets.
This paper describes how the erosion effects is minimised and how thin wall stainless steel sections can be brazed using stainless steel brazing alloys. Through process control and well designed composition the erosion of stainless steel brazing alloys are the same or less than equivalent Ni brazing alloys.
The influence of alloy composition, brazing cycle and application technology on erosion is studied on 0,3 mm thin sheets of stainless steel. It is demonstrated that with the correct materials and settings it is possible to braze with stainless steel brazing alloys without noticeable influencing the micro structure in the sheet metal. The stainless steel braze alloy has less erosion and microstructural effect on the thin sheet metal than the standard Ni based brazing alloys BNi 2, BNi 5 and BNi 7.