MIG welding device

Abstract

The invention relates to an MIG welding device. The MIG welding device comprises a wire feeding mechanism, a welding gun guide pipe, a welding gun, a compensative gas nozzle, a first gas source mechanism and a second gas source mechanism; one end of the welding gun guide pipe is connected with the welding gun, and the other end of the welding gun guide pipe is connected with the first gas source mechanism and the wire feeding mechanism; the compensative gas nozzle is connected with the second gas source mechanism and fixed to the side of a nozzle of the welding gun; the first gas source mechanism is used for providing protective gas for MIG welding; and the second gas source mechanism is used for providing compensative gas used for stirring a welding pool after the welding pool is formed through MIG welding. According to the MIG welding device, by introducing the compensative gas, the unsolidified high-temperature welding pool is subjected to jet impinging, the double-protective-gas structure is formed, by applying tiny external force to the welding pool, the original high-speed welding periodically fluctuant liquid metal stacking state is effectively changed, liquid metal in the peak area is made to flow towards the valley, a beautiful welded seam is formed, and the welding quality is greatly improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a MIG welding device. Background technique [0002] High-speed welding technology belongs to the key research category of modern high-efficiency welding technology. Melt Inert-gas Welding (MIG welding) is one of the main methods of high-speed welding. However, when MIG welding is used for high-speed welding, there is a more prominent problem like other welding methods working at high-speed welding: when the welding speed increases to a certain value, defects such as undercut and hump will appear in the weld. These defects not only deteriorate the appearance of the weld, but most importantly, seriously affect the mechanical properties of the weld, which is the most important reason for further improvement of welding speed and efficiency. Contents of the invention [0003] The present invention provides a MIG welding device in order to solve the above technical problems. [00...

AI Technical Summary

Problems solved by technology

However, when MIG welding is used for high-speed welding, there is a more prominent problem like other welding methods in the high-speed welding state: when the welding speed increases to a certain value, defects such as undercuts and humps will appear in the weld

These defects not only make the appearance of the weld worse, but the most important thing is that it will seriously affect the mechanical properties of the weld, which is the most important reason for the further improvement of welding speed and efficiency.

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