Design Suitable For Soldering

Brazing (soldering with solders above 450 ° C [1]) is mainly used for joining metallic materials. The main difference to fusion welding is that the base materials are not melted during soldering. This means that a wide variety of material combinations can be combined, such as aluminum and stainless steel, aluminum and copper, steel and hard metal. In general, the following strengths can be expected for properly performed brazed connections [2,3,4]: tensile strength = 200 MPa; Shear strength = 100 MPa. It is important to achieve the optimum solder gap width depending on the selected soldering process to achieve the basic material strength.

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Construction rules

The following rules must be observed when brazing:

• Provide parallel-walled edges
• The solder must be in contact with the solder gap when it melts
• Keep solder flow paths as short as possible
• Design workpieces self-locking
• Consideration of dimensional changes due to thermal expansion
• Allow change of solder flux
• Avoid sudden changes in cross-section
• Keep deburring chamfers small and flat

The standards DIN 65169 [5] and DIN EN 14324 [6] deal with the construction of brazed connections.

Soldering process

The most commonly used soldering methods include flame brazing, induction brazing and furnace brazing. Flame hard soldering is used both manually and with fully automated soldering systems for a wide variety of materials and applications. With induction brazing, the heat is generated in the workpiece itself and does not need to be transferred from the outside by heat conduction, convection or heat radiation. Furnace brazing is a flux-free soldering process in a controlled furnace atmosphere (normal atmosphere, reducing or inert protective gas and vacuum [7]).

Content of the article:

• Page 1: Soldering design
• Page 2: Lot and process selection

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Article files and article links

Link: To the DVS pocket book Brazing