Central negative-pressure arc welding device and method

Abstract

The invention relates to a central negative-pressure arc welding device and method, and belongs to the technical field of welding equipment and methods. An inner cavity of a hollow tubular electrode and the center of an arc below the hollow tubular electrode enter a negative-pressure state by virtue of an air extraction device, the radial pressure gradient of the arc from the outside to the center of the arc is increased, and under the action of external atmospheric pressure, the arc is constricted into a high-energy density restrained arc. The magnitude of central pressure of the arc is regulated to regulate the magnitude of restraint intensity, energy density and voltage of the arc, thereby well controlling the welding heat input and the forming of a welding seam. According to the welding device and the welding method, high stability of a TIG (tungsten inert gas) welding arc and high energy density of a plasma arc are integrated, so that the defects of complexity in parameter regulation, narrow process window and the like of a plasma arc welding process are overcome, the detects of small welding penetration and low welding efficiency of the conventional TIG arc are overcome, the welding speed is greatly accelerated, the welding efficiency is greatly improved, and high-quality and efficient welding is unified.

Description

technical field [0001] The invention relates to a central negative pressure arc welding device and method, and belongs to the technical field of welding equipment and applications. Background technique [0002] In 1907, the Swedes invented arc welding with electrodes, applied it to the connection of metals, and established the foundation of welding technology. Welding technology is developing rapidly. Today, in various forms of metal connection technology, arc welding technology has been widely used to produce various high-quality connections. In modern manufacturing and industrial production processes, welding technology has become a It is an important metal forming process widely used in the automotive, marine, marine, aerospace and other industrial sectors. With the continuous improvement of the needs of all walks of life, increasing the productivity of welding production, ensuring product quality, and realizing the automation and intelligence of welding production are g...

AI Technical Summary

Problems solved by technology

[0008] However, laser welding and electron beam welding have expensive welding equipment, high requirements on the external welding environment, high equipment operating costs, small beam diameter, and particularly strict requirements on joint assembly; and plasma arc welding also has a relatively narrow welding process window. Narrow, difficult to control, and lack of high technical requirements for workers, etc., which limit their application and promotion in industry, so they are currently mainly used in high-tech fields such as aircraft, rockets, spaceships and space welding.

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