Device and method for additional welding seam compensation shielding gas

Abstract

The invention discloses a device and method for compensating additional welded joints for protective gas. The device comprises a gas bottle, a welding wire feeding mechanism, a gas feeding pipe of a welding gun spraying nozzle and a gas compensating spraying nozzle. The gas feeding pipe comprises a gas feeding header pipe body, a B branch pipe body, a C branch pipe body and a three-way valve. One end of the gas feeding header pipe body is connected with the A end of the three-way valve, one end of the B branch pipe body is connected with the B end of the three-way valve, the other end of the B branch pipe body is communicated with the welding gun spraying nozzle, one end of the C branch pipe body is connected with the C end of the three-way valve, and the other end of the C branch pipe body is connected with the gas compensating spraying nozzle. The protective gas firstly passes through a one-way valve through the C branch pipe body and is then sprayed to the welded joints separated from a welding gun electric arc region through the gas compensating spraying nozzle, a welded joint molten bath region which is not solidified is covered with gas flow, the welded joints originally exposed in air accordingly obtain stable, reliable and continuous gas protection, and the welding defects such as welded joint oxidation, cracks, gas holes, undercutting and stainless steel embrittlement can be effectively prevented.

Description

technical field [0001] The invention relates to a gas shielded welding device and process, in particular to a device and method for supplementing a welding seam to compensate shielding gas. Background technique [0002] Gas shielded welding is one of the main welding methods in the world today. According to the statistics of consumable materials, consumable materials for gas shielded welding in industrially developed countries account for about 60% of the total welding materials, while in Japan it is as high as 70%. Gas shielded welding technology also has a booming trend. Regarding the basic principles and characteristics of gas shielded welding, Professor Yin Shuyan, a domestic welding expert, has made a clear statement in his new academic book "Basic and Application of Gas Shielded Welding Process" (Machinery Industry Press, first edition in September 2012). I won't repeat them here. In the gas shielded welding technology, the shielding gas, as the arc medium, mainly u...

AI Technical Summary

Problems solved by technology

However, from the above-mentioned existing gas shielded welding theory and industry application, it can be seen that the shielding gas obviously undertakes multiple functions in a limited time and space, and the burden is too heavy, which will inevitably lead to the phenomenon of taking care of one thing and losing another in terms of functions, which will affect the weld quality and welding quality to a certain extent. Efficiency is further improved

It can be seen from the theory and practical application that people obviously realize that the protective function of shielding gas is extremely important, but they cannot find a better way to change this unfavorable situation from the existing gas shielded welding theory and practical technology.

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