Face-down bonding technique capable of preventing electric resistance welding parts from deforming

Abstract

The invention discloses a reverse welding technology for preventing the deformation of a resistance welding workpiece, which comprises the following steps: first, a workpiece platform (3) is mounted under the workpiece; then plank stuff (4 and 5) is arranged on the plane of the platform (3); after a welding pin (6) is mounted and positioned, an upper electrode (1) is pressed first to press the plank stuff (4 and 5) on the workpiece platform; then a lower electrode (2) rises to support the workpiece tightly; the electrodes (1 and 2) discharge electricity to perform welding; during the discharge of electricity, the welding pin (6) in the formed return circuit serves as both a workpiece and an electrode; during welding, the wind direction of axial blowers arranged in advance on the upper and the lower surfaces of the plank stuff (4 and 5) is aimed at the welding position and the direction of the welded plank stuff; the wind, which is mainly aimed at the welding position, is blown constantly to perform wind cooling to the welding point. The reserve welding technology for preventing the deformation of the resistance welding workpiece is mainly used for solving the problem of the deformation of workpieces with relatively large areas when resistance welding is used, thus eradicating the thermal deformation and the mechanical deformation of the workpieces, ensuring the planeness of the workpieces and improving product quality.

Description

technical field [0001] The present invention relates to welding, specifically to resistance welding, and belongs to the reverse welding process in resistance welding. Background technique [0002] Plate evaporator is an important equipment in alumina plant. In the process of manufacturing the plates of the plate evaporator, many welding studs are needed between the upper and lower plates to weld them together, and even thousands of welding studs are required for large plates. In order to improve the quality and production efficiency of the manufactured plates, the four-sided double-spot welding process invented by the inventor came into being. The conventional process is that the lower electrode is raised first to hold up the plate, and then the upper electrode is pressed down to compress the plate, and then discharge welding. During the welding process, there are not only thermal deformation caused by high-current welding, but also mechanical deformation caused by multipl...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a reverse welding process that prevents the deformation of resistance welding workpieces, so as to overcome the defects in the traditional process and fundamentally solve the problem of workpiece deformation in plate production

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