Micro spot welding technology of nickel plated copper wiring harness and copper plate

Abstract

The invention discloses a micro spot welding technology of a nickel plated copper wiring harness and a copper plate. The technological process of the micro spot welding technology sequentially comprises the steps of welding part pre-pressing, welding of the first time, cooling of the first time, welding of the second time, cooling of the second time, welding of the third time and pressure maintaining on a welding part. According to the micro spot welding technology, a nickel plated layer of a joint interface can be molten, and the influence of the residual nickel plated layer on the connectingquality of a welding joint is effectively reduced; under the work condition of welding of one time, mechanical embedment serves as the connecting manner of the nickel plated copper wiring harness andthe copper plate; by means of the work condition of welding of multiple times, solid phase connection between the nickel plated copper wiring harness and the copper plate can be achieved, and the connecting strength of the welding spot can be improved; and by means of the technological method of welding of multiple times, the bending and deforming degree of the copper plate can be effectively reduced, the technological problems of welding spot cracking and the like can be solved, and the connecting quality of the welding spot can be improved.

Description

technical field [0001] The invention belongs to the technical field of welding technology, and specifically designs a micro-spot welding technology of a nickel-plated copper wire harness and a copper plate. Background technique [0002] The rectifier diode is an important part of the motor driver, and its connection quality has an important impact on the service life of the driver. The matching form of nickel-plated copper wire harness and copper plate is a common connection form in rectifier diodes. The micro spot welding process is widely used in the field of micro-scale joining due to its advantages of high automation and low cost. The traditional single-shot micro-spot welding process for the micro-spot welding connection of the nickel-plated copper wire harness and the copper plate mainly has the following two problems: (1) the matching form of the wire harness and the board dissipates heat quickly, and the heat is difficult to concentrate; (2) the nickel coating melts...

AI Technical Summary

Problems solved by technology

The traditional single-shot micro-spot welding process for the micro-spot welding connection of the nickel-plated copper wire harness and the copper plate mainly has the following two problems: (1) the matching form of the wire harness and the board dissipates heat quickly, and the heat is difficult to concentrate; (2) the nickel coating melts The temperature is high, and the interface is difficult to melt to form an effective connection

If a large welding current is used to reach the melting point of the nickel coating, the copper will be softened due to excessive heat, resulting in large deformation, affecting the welding quality, and welding cracks and other process problems.

If a small welding current is used, it is difficult for the nickel coating to reach the melting temperature, resulting in process problems such as missing welding

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