Underwater local dry-method GMAW welding torch for double-layer gas structure

Abstract

The invention specifically relates to an underwater local dry-method GMAW welding torch for a double-layer gas structure. The underwater local dry-method GMAW welding torch for the double-layer gas structure comprises a direct-current motor, a welding gun with an extended nozzle, a water drainage cover, and a water drainage gas-settling cover installed between the direct-current motor and the water drainage cover, wherein a hollow shaft of the direct-current motor extends downwards and penetrates through a hollow part of the water drainage gas-settling cover to reach the bottom surface of thewater drainage gas-settling cover; the water drainage gas-settling cover is fixedly installed on the lower surface of the direct-current motor; water drainage gas is charged into an inner chamber of the water drainage gas-settling cover through an intake port formed in the sidewall of the water drainage gas-settling cover; an annular rotary ventilation disc is installed on the bottom surface of the water drainage gas-settling cover, the upper surface of the water drainage cover is fixedly connected to the lower surface of the rotary ventilation disc, and a through hole adaptive to the rotary ventilation disc is formed in the upper surface of the water drainage cover and used for realizing flowing of the gas; an exhaust hole is formed in the sidewall of the water drainage cover and rotary blades are arranged on the sidewall of the water drainage cover; the water drainage cover can be driven to rotate through the rotation of the direct-current motor, the rotary blades can be driven to rotate, so that the water drainage effect is improved; and the welding gun with the extended nozzle passes through the hollow shaft and then penetrates out of the water drainage cover. According to thedevice, the adopted water drainage gas is high-temperature gas, and a great water drainage effect is achieved.

Description

technical field [0001] The invention relates to the field of underwater partial dry gas shielded welding, in particular to an underwater local dry GMAW welding torch with a double-layer gas structure. Background technique [0002] Underwater partial dry gas shielded welding is currently an underwater welding method that is a research hotspot. This method is an automatic or semi-automatic welding method that uses protective gas sprayed from a specific drainage cover to make a local dry environment in the weld area within a certain range, thereby ensuring the welding quality. [0003] In the prior art, the application number is 20171000477917, and the name of the invention is: double air flow structure local dry method underwater robot welding miniature drainage cover. Although the disclosed device realizes the effect of gas rotation and drainage, the speed of gas rotation is limited by the mechanical structure , can’t be adjusted, and the device simply utilizes gas to drain ...

AI Technical Summary

Problems solved by technology

However, due to the existence of gas inside the torch as both shielding gas and drain gas, the flow rate of drain gas cannot be adjusted independently

When welding in large water depth, if the flow rate of welding shielding gas is large and it is a rotating air flow, the gas flow rate in the welding torch is too large, and it is prone to turbulent flow, which will easily cause instability to the welding arc

In addition, the drainage gas used in this device is normal temperature gas, which is not ideal for the drainage of water splashed on the surface of the weld during the drainage process.

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