Resistance welding device for simultaneous circumferential welding of deep cavity

Abstract

The invention discloses an electric resistance welding device used for circumferential welding while deep inner cavity tensioning. The electric resistance welding device comprises an extension rod and a fixed barrel sleeving the extension rod, wherein an annular support is mounted at the bottom end of the fixed barrel; the extension rod is in screw-thread fit with the support, and a ball head is mounted at the lower end part of the extension rod; a plurality of electrode heads are hinged onto the outer circumference wall of the support; the end face, close to the circle center of the ball head, of each electrode head protrudes inwards along the radial direction of the fixed barrel, and an inner circle surface matched with the ball surface of the ball head is arranged on each protruding part; a protrusion is arranged at the lower part of the end face, far away from the circle center of the ball head, of each electrode head; the electrode heads are mutually connected through elastic rubber rings to form a circular ring with a telescopic function. A thin-walled annular part can be propped to be circular, irregular polygons are prevented from appearing at the welding part of a filter screen, and special components and parts similar to components and parts with small openings and large bellies are welded and processed, so that the labor intensity of workers is reduced while simultaneous multi-point welding is realized.

Description

technical field [0001] The invention relates to the fields of aviation and aerospace, in particular to a resistance welding device used for deep inner cavity tensioning and simultaneous circumferential welding. Background technique [0002] The filter parts used in my country's aviation and aerospace play an important role in the aircraft fuel and lubricating oil system. There are many types, high precision, and difficult welding. They mainly play the role of fixing, supporting and filtering. The metal structure of various filters is mainly composed of upper end cover, filter screen and lower end cover through vacuum brazing. Generally, before brazing in the furnace, each part of the filter is welded and positioned by resistance welding. The maximum thickness of the filter screen is only 0.4mm, and the filter screen must be tightly fitted on the upper and lower end covers with special devices before welding. However, because the welding lap size of each component is only 2mm...

AI Technical Summary

Problems solved by technology

The maximum thickness of the filter screen is only 0.4mm, and the filter screen must be tightly fitted on the upper and lower end covers with special devices before welding. However, because the welding lap size of each component is only 2mm, the general-purpose electrodes cannot be used for intensive resistance welding at all, and even The electrodes cannot extend into the cavity at all, so the difficulty of welding the filter is greatly enhanced

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