Secondary gas protection device for narrow-gap MAG/MIG automatic welding

Abstract

The invention discloses a narrow gap MAG/MIG automatic welding secondary gas protection device which comprises a welding gun seat and a narrow gap welding gun, the narrow gap welding gun is fixed to the welding gun seat, the narrow gap welding gun is sequentially provided with a device body, a uniform flow filter screen pipe, a filter screen pipe protection structure and a flow limiting guide groove, and the device body comprises a front device body and a rear device body. The upper part of each rectangular cuboid structure is provided with a mounting structure of a uniform flow filter screen pipe, the middle part of each rectangular cuboid structure is provided with a protection structure of the filter screen pipe, and the lower part of each rectangular cuboid structure is provided with a flow limiting guide groove. The secondary protection device is located at a low set working temperature for a long time, and is stable, reliable and long in service life; the secondary protection device is always at a lower working temperature, so that spatter cannot be welded with the device and is extremely easy to remove; the filter screen pipe is permanently free of splashing deposition, protection on a high-temperature welding area is extremely reliable, and the defect of welding air holes caused by splashing deposition of the filter screen pipe is completely eradicated.

Description

technical field [0001] The invention belongs to the technical field of welding, and in particular relates to a secondary gas protection device for automatic welding of narrow gap MAG / MIG. Background technique [0002] Secondary gas shielding is a unique application under the condition of narrow gap gas shielded welding, which directly determines the weld quality and reliability of the arc ignition and arc extinguishing end, especially the weld quality and reliability of the secondary cover welding layer and the cover welding layer. This secondary gas shielding technology is slightly defective, and the probability of porosity defects in the weld is high. [0003] In the development and application of narrow-gap gas shielded welding for more than half a century, the mature secondary protection technologies formed are limited, and there are basically the following types: one is the multi-layer filter uniform flow technology, and the other is the plate-type porous uniform flow t...

AI Technical Summary

Problems solved by technology

[0004] The typical structure of the filter screen uniform flow technology is that after laminating the multi-layer stainless steel filter screen with a very high mesh number, the filter tube made by laser welding is used as the uniform flow device, and then the oval secondary protective gas flow limiting cover is used The scope of the secondary gas protection is given; the main limitations of this technology are: 1. The circulating water cooling effect of the restrictor is poor, which is not conducive to the long-term reliable and stable operation of the secondary gas protection device

2. The uniform flow filter tube is directly exposed to the spattering area of ​​the splash. When the surface of the uniform flow filter tube is welded and accumulated a certain amount of splash, the uniform flow filter tube will fail and the protection effect will be greatly reduced

In order to avoid welding defects caused by the accumulation of spattered deposition, the more expensive uniform flow filter tube can only be replaced frequently

3. The low life of the secondary protection device increases the production cost

4. The gas consumption is high, which is not conducive to reducing the welding production cost

[0005] Plate-type porous uniform flow technology is mostly used for secondary protection under narrow gap TIG welding conditions, and is rarely used under narrow gap MIG welding conditions; since TIG welding has no welding spatter, there is no life problem caused by spatter; but the water cooling effect Poor limitations still exist. When the plate-type multi-hole uniform flow technology is used under the condition of narrow gap MIGA welding, the existing technology still has the limitation of short service life.

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