Metal arc welding method with annular negative pressure

Abstract

The invention provides an annular negative-pressure consumable electrode arc welding method, and belongs to the field of welding methods. A negative-pressure state is formed in an inner cavity of an annular electrode through an air extracting device, a negative-pressure area is transmitted to a central area of an arc, a certain pressure difference value is formed in the radial direction of the arc, and the arc generates a constrained effect through the action of the atmospheric pressure to form a constrained arc with the high energy density. The constraint degree, the energy density and the voltage size of the arc can be adjusted by adjusting the size of the pressure in the center of the arc, and therefore good control over welding heat input and weld joint formation is achieved. In addition, a welding wire is perpendicularly fed into an arc area formed between the annular electrode and a workpiece by utilizing a wire feeding device through the inner cavity of the annular electrode, therefore, the welding wire and the workpiece are connected into a loop, a second arc is formed, and annular negative-pressure consumable electrode double-arc welding is achieved. According to the welding method, not only are the good stability of the non-consumable electrode arc and the high energy density of the plasma arc combined, but also consumable electrode welding is coupled in the welding process.

Description

technical field [0001] The invention relates to a method for arc welding of melting electrode annular negative pressure, which belongs to the field of welding methods. Background technique [0002] Welding technology is an important processing technology in modern industry. Through welding, the permanent connection between molecules between different workpieces can be realized. The welding connection has good sealing performance and high structural strength. Therefore, welding is also called "industrial tailoring". Since the Swedish invented electrode arc welding in 1907, after more than a century of development, welding technology has been greatly improved, but with the gradual development of modern industry, traditional welding technology can no longer meet people's needs, so the research and development Fast and efficient welding technology has become an important content to promote industrial development. [0003] Welding is divided into three parts: pressure welding, a...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects and deficiencies of the existing welding methods, and propose a ring-shaped negative-pressure arc welding method that combines melting electrodes, non-melting electrodes and air pressure control arcs

Images