Welding structure of non-indentation universal arc surface electric resistance welding

Abstract

The invention relates to a welding structure of non-indentation universal arc surface electric resistance welding. The welding structure is used for electric resistance spot welding of an arc surfacestructure of a roof in a high-speed bullet train and comprises electric resistance spot welding equipment, and an upper electrode holding rod and a lower electrode holding rod are mounted on the upperpart and the lower part of an operating table of the electric resistance spot welding equipment correspondingly; the upper end of the lower electrode holding rod is connected with a universal arc surface lower electrode which comprises a lower electrode universal ball head, an electrode head is arranged on the lower electrode universal ball head, and the lower part of the electrode head is provided with a spherical containing cavity in clearance fit with the electrode universal ball head; and the upper part of the electrode head is provided with an arc surface plate, and the radius of the arcsurface plate is consistent with the radius of the arc surface of the roof in the high-speed bullet train. A traditional spherical surface electrode and a planar electrode are replaced by the universal arc surface lower electrode, the radian of a lining plate on the top of the lower electrode can be replaced according to the product radian, the welding structure is suitable for electric resistance spot welding of products with different radians, the surface has no indentation after welding, the production processing procedure is simplified, the production efficiency is improved, the requirement for skill of an operator is lowered, and the problems of arc surface attaching and indentation are solved.

Description

Technical field [0001] The invention relates to a welding structure for resistance welding, in particular to a welding structure for universal arc surface resistance welding without indentation, which is suitable for resistance spot welding of arc surface structures in high-speed motor cars that require no indentation on the surface. Background technique [0002] With the rapid development of my country's rail transit industry, light-weight, low-noise, energy-saving and environmentally friendly trains have become the development trend of rail transit vehicles. The middle roof structure of the high-speed EMU is optimized to an aluminum alloy sheet metal structure, the middle roof is formed by a curved surface mold, and the mounting seat and reinforcing ribs are bent and formed and connected with the middle roof by welding. The traditional welding connection method uses tungsten inert gas shielded welding. This method has a large welding heat input, low welding efficiency, and high...

AI Technical Summary

Problems solved by technology

The traditional welding connection method adopts tungsten inert gas shielded welding. This method has large welding heat input, low welding efficiency, high requirements for welders' operation skills, reverse penetration of thin plates after welding, and poor surface quality of products. Surface preparation work, high production costs

There is also a spherical electrode or a flat electrode resistance spot welding connection. This method has small welding deformation, high production efficiency, stable welding quality, low operator skill requirements, and good economy. There are indentations on the surface of the product after welding, especially arc surface structure products. The indentation is deeper, the surface quality cannot meet the requirements, and a lot of surface treatment work needs to be added before painting, and the production cost is high

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