Method for preparing CuW/Cu/CuCrZr integrated contact through electron beam welding

Abstract

The invention provides a method for preparing a CuW / Cu / CuCrZr integrated contact through electron beam welding and belongs to the field of production and manufacturing of high-voltage switch electrical contacts. One side of the electrical contact is made of a base material CuW / Cu, and the other side of the electrical contact is made of a base material CuCrZr. The method comprises the following steps that 1, the base material CuW / Cu on one side of the electrical contact is manufactured in a connection mode through a sintering method; and 2, the CuW / Cu subjected to sintering treatment and the CuCrZr are subjected to direct electron beam welding, a welding surface is made of Cu and the CuCrZr, a welded joint is a square butt joint, the joint gap value is zero, welding filling materials are not filled, a weld forming a 45-degree angle with the axis of the contact is adopted for electron beam welding, and thermal treatment is not needed after welding. Compared with the prior art, the high-temperature mechanical performance of chromium-copper can be improved, and the high welding strength can be achieved; moreover, it can be guaranteed that a Cu base is not annealed or softened; meanwhile, the stress of a vertical weld heat-affected zone is small, the sectioned contact cannot deform after being pulled and inserted for many times, and the contact finger force is stable.

Description

technical field [0001] The invention belongs to the field of production and manufacture of high-voltage switch electric contacts, and in particular relates to an electron beam welding preparation method of CuW / Cu / CuCrZr integral contacts. Background technique [0002] At present, the existing self-supporting contact CuW / Cu-CuCrZr generally adopts the integral sintering manufacturing method, and the CuW / Cu is prepared as an integral sintering, and the Cu side and CuCrZr are also integrally sintered to prepare a high-voltage electrical contact. . [0003] The existing technical method is prepared by the overall sintering method. On the one hand, the size of the electrical contact, especially the size of the tail end, is greatly restricted by the overall sintering. Due to the limitation of the sintering equipment, the sintering process cannot be used for electrical contacts exceeding the limited length. Preparation will cause great constraints on product specifications; on the...

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Problems solved by technology

[0003] The existing technical method is prepared by the overall sintering method. On the one hand, the size of the electrical contact, especially the size of the tail end, is greatly restricted by the overall sintering. Due to the limitation of the sintering equipment, the sintering process cannot be used for electrical contacts exceeding the limited length. Preparation will cause great constraints on product specifications; on the other hand, the support material (CuCrZr) undergoes high-temperature sintering process, which will cause changes in the structure of electrical contacts, resulting in low high-temperature mechanical properties and poor elasticity. The contact will be deformed after repeated plugging and unplugging, which will reduce the force of the contact finger and affect the performance of the self-supporting contact

Especially for the tail end made of chrome-copper-zirconium, during the high-temperature sintering process, the zirconium element will undergo serious volatilization and component segregation, which will cause a large change in the structure and a serious decline in performance; in addition, the overall sintering method cannot achieve production. Automation, low production efficiency, high cost, poor process stability, high energy consumption and at the same time, certain environmental pollution

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