Method and device for conducting silver or silver alloy contact hard soldering through alternating current welding machine

Abstract

The invention discloses a method and device for conducting silver or silver alloy contact hard soldering through an alternating current welding machine. A metal reed (3) is disposed on a lower electrode (2) and provided with a soldering material (4). The soldering material (4) and the metal reed (3) are tightly pressed through a pressing rod (5), then a power source is switched on, an upper electrode (1) and the lower electrode (2) are made to communicate, heat is generated when a current flows through the lower electrode (2), and is conducted to the metal reed (3), a contact (6) and the soldering material (4), the metal reed (3) and the contact (6) are welded into a whole after the soldering material (4) reaches the melting temperature and is melted, and operation is completed. By means of the method, the current direction of the upper electrode is changed, and accordingly the influences of the addition amount of soldering flux on soldering and soldering quality are eliminated.

Description

technical field [0001] The invention relates to a method for hard brazing of silver or silver alloy contacts by an AC welding machine during the production of parts of relays or contactors, in particular to a method for brazing silver or silver alloy contacts by an AC welding machine that does not affect current conduction. Point brazing method. Background technique [0002] For the brazing of silver or silver alloy contacts of AC welding machines, the solder is silver-copper solder or copper-based solder, and the spot welding heating method usually used, such as figure 1 Shown: [0003] The upper electrode is made of copper or graphite; the lower electrode is mainly made of graphite; the solder is made of silver-copper alloy or copper-based alloy; the metal reed is usually made of copper or copper alloy, and the contact is made of silver or copper. Silver alloy material. [0004] Brazing process and principle. When the contact is brazed, the upper electrode exerts a cer...

AI Technical Summary

Problems solved by technology

Therefore, during the brazing process, when adding flux between the solder and the metal, the amount of addition is not easy to control. If the amount is too large, the current will be broken, and the graphite electrode cannot be heated, so it cannot be brazed; if the amount is too small, it will affect the The fluidity and spreadability of the solder during melting affect the quality of brazing

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