Abstract: A brazing material for brazing a brazed plate heat exchanger comprising a number of heat exchanger plates being provided with a pressed pattern of ridges and grooves adapted to provide contact points between neighbouring heat exchanger plates, such that the heat exchanger plates are kept on a distance from one another and such that interplate flow channels for media to exchange heat are formed between the heat exchanger plates comprises a brazing alloy comprising at least one melting point depressing element and metals resembling the composition of the heat exchanger plates. The brazing material comprises a mixture between grains of a melting brazing material having solidus and liquidus temperatures lower than a brazing temperature and a non-melting brazing material having solidus and liquidus temperatures above the brazing temperature.

Abstract: A method for brazing a plate heat exchanger (10) having a stack of heat exchanger plates with depressions and elevations forming interplate flow channels and port openings being in selective fluid communication with said interplate flow channels, the method comprising the steps of placing the stack of heat exchanger plates in a heating chamber (16) of a furnace (15), conducting a gas for changing the temperature of the stack of heat exchanger plates through a plurality of nozzles (23) inside the heating chamber (16), and conducting gas from at least one of said nozzles (23) into at least one of the port openings (O1-O4) of the stack of heat exchanger plates. Disclosed is also a system for brazing a plate heat exchanger (10).

Abstract: A brazing material for brazing a brazed plate heat exchanger comprising a number of heat exchanger plates being provided with a pressed pattern of ridges and grooves adapted to provide contact points between neighbouring heat exchanger plates, such that the heat exchanger plates are kept on a distance from one another and such that interplate flow channels for media to exchange heat are formed between the heat exchanger plates comprises a brazing alloy comprising at least one melting point depressing element and metals resembling the composition of the heat exchanger plates. The brazing material comprises a mixture between grains of a melting brazing material having solidus and liquidus temperatures lower than a brazing temperature and a non-melting brazing material having solidus and liquidus temperatures above the brazing temperature.

Abstract: A brazing material for brazing a brazed plate heat exchanger comprising a number of heat exchanger plates being provided with a pressed pattern of ridges and grooves adapted to provide contact points between neighbouring heat exchanger plates, such that the heat exchanger plates are kept on a distance from one another and such that interplate flow channels for media to exchange heat are formed between the heat exchanger plates comprises a brazing alloy comprising at least one melting point depressing element and metals resembling the composition of the heat exchanger plates. The brazing material comprises a mixture between grains of a melting brazing material having solidus and liquidus temperatures lower than a brazing temperature and a non-melting brazing material having solidus and liquidus temperatures above the brazing temperature.

Abstract: The present application relates to a stencil device (150) for simultaneous stencil printing of brazing material onto elevations, areas surrounding port openings, and a circumferential skirt (210) of a heat exchanger plate (200) wherein the stencil device (150) comprises an upper stencil having openings for applying brazing material to elevations and areas surrounding port openings of the heat exchanger plate (200) and a lower stencil printing stencil (150) having a large opening (190) for receiving the heat exchanger plate (200) and contacting an outer perimeter of the circumferential skirt (210) of the heat exchanger plate (200), wherein an inner surface (195) of the large opening (190) comprises brazing material exits (160) for applying brazing material to the circumferential skirts (195). Disclosed is also a method of such stencil printing and also the use of a stencil device for applying heat exchanger plates (200) with a brazing material.

Abstract: A brazing material for brazing articles of austenitic stainless steel comprises: 1.8-2.2% Molybdenum (Mo); 12.5-13.5% Nickel (Ni); 16.8-18.6% Chromium (Cr); 7.0-12.0% Silicon (Si); 3.0-5.5% Mn; 1.0-2.0% Boron (B); balance being Iron (Fe) and small amounts of other elements, wherein the percentages of these elements are lower than 0.1% for each element, all percentages being given by weight.