Portable underwater dry-type welding device

Abstract

The invention relates to a portable underwater dry-type welding device, which comprises an electric welding machine, an air compressor, and a welding handle and a common welding rod under water. The portable underwater dry-type welding device is characterized in that the welding device comprises a welding cover, a seal gasket arranged at the mouth of the welding cover, an air inlet device arranged on the surface of the cover housing, and a welding rod entrance; the air compressor is connected with the air inlet device; and the welding device can generate a local dry welding space under water by draining water through air or other protection gas to weld a welding seam having a welding strength similar to that on the ground. The device can implement underwater welding by using common ground welding rod, and divers and workers on the ground can view the arc burning process clearly in the welding process. The welding can be carried out while the welding cover is moved when the welding region is kept dry. The device can be used for muddy water environment or underwater environment with low visibility.

Description

technical field [0001] The invention relates to the field of underwater welding, in particular to a portable underwater dry welding device. Background technique [0002] Underwater welding is the main way of hydraulic structure connection, an important means of underwater maintenance of ships, and the most important technology in underwater operation technology. For underwater welding of high-quality and important structures, dry welding is generally adopted in foreign countries, that is, a water-proof cabin is designed and built at the welding part to exclude the seawater inside, so that both the welder and the welding part are in a dry environment. The quality of dry welding is high, but the structure of the water barrier is complicated, the cost is high, and it is not universal. [0003] Domestically, in the 1980s, the Harbin Welding Institute successfully developed an underwater partial drainage carbon dioxide protection welding device. Under water, carbon dioxide gas i...

AI Technical Summary

Problems solved by technology

But its shortcomings: divers and surface personnel cannot observe the welding position and welding process, which is actually "blind welding", and it is not suitable for muddy waters, such as the East China Sea; special flux-cored welding wire is used for welding, and the welding wire is special and difficult to weld. Purchased, the welding wire is soft, because the operation of underwater welding divers is not as smooth as that on land, the welding wire is easy to stick to the welding surface, after sticking, the diver can only cut it short with pliers, and the welding efficiency is not high; the miniature cover is small, making the dry area Smaller than the welding heat-affected zone, which affects the welding strength

Wet welding, due to its simple operation, simple equipment, and wide adaptability; but the arc is unstable, the weld seam is not well formed, and the mechanical properties of the welded joint are poor, so wet welding can only be used for temporary repairs of underwater non-important structures

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