Joining two parts via preformed solder ring - where one part is provided with convex projection so high quality joint is obtd.

摘要

One part consists of a carrier (10), which is provided with a convex projection on its joint surface. The second part (12), which is e.g. a wire with a head, is placed on the projection; and the joint is surrounded by a solder ring(13). The assembly (10,12,13) is then heated to melt the solder (13), which wets both parts (10,12) to make the joint. When the solder ring (13) melts, the non-metallic inclusions and flux residues remain outside the joint so a clean bond free from piping and segregation is obtd. The result is a much better bond than when a solder foil is used. Copper wire (12) has head (12a), with joint surface (12b) placed on a convex projection (11) in a copper sheet carrier (10). A soft solder ring (13) is placed round the joint, followed by heating in a controlled atmos. to make bond (13a).