Special portable miniature drainage cover for automatic underwater local dry-method welding

Abstract

The invention provides a special portable miniature drainage cover for automatic underwater local dry-method welding. A drainage cover body of the drainage cover comprises an upper end cover, an organic glass cover and a lower end cover. A clamping rod, an air inlet quick plug connector, a lower locking sleeve, a cooling air chamber and an underwater camera component are fixed to the upper side of the upper end cover and the lower side of the upper end cover through threaded connection respectively, and the upper end cover and lower end cover are connected with the organic glass cover through threads. A welding oscillator is clamped on the upper portion of a copper welding torch of a welding gun. According to the structure of a drainage sealing device, drainage felt and a felt skirt are arranged on the periphery of the lower end cover, and the drainage felt and the felt skirt are fastened on the lower end cover through hose clamps; the copper welding torch of the welding gun is fastened through an upper locking sleeve and the lower locking sleeve, the welding gun is inserted into the organic glass cover, and an elastic rubber leather sheath is arranged between the upper locking sleeve and the lower locking sleeve. The special portable miniature drainage cover for automatic underwater local dry-method welding has the advantages of being simple in structure, exquisite, convenient and fast to use, low in cost, obvious in drainage effect, and stable and reliable in welding process. Moreover, a connector with the quality of on-land welding is formed, the welding efficiency is improved and the special portable miniature drainage cover is easy to popularize.

Description

technical field [0001] The invention relates to an underwater welding device, in particular to a portable underwater partial dry automatic welding miniature drainage cover. Background technique [0002] Ocean engineering underwater welding technology has become one of the essential key technologies in the current ocean resource development and ocean engineering technology. Due to the external loads of marine engineering structures in service at sea, different degrees of damage and performance loss will occur, such as impact defects, corrosion, fatigue cracks, etc., resulting in the attenuation of marine engineering resistance, making these marine structures during service All need continuous maintenance and repair to ensure the safe and reliable operation of the structure. [0003] At present, there are many kinds of underwater welding methods being applied and researched in various countries in the world, among which arc welding is more mature. The biggest feature of wet ...

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Problems solved by technology

[0005] As early as the 1980s, the domestic Harbin Welding Institute developed an underwater local drainage CO 2 Semi-automatic welding has obtained better quality welds and successfully repaired marine engineering structures. The disadvantage is that welding projects require a large amount of CO 2 Gas, and the drainage cover is large, which is inconvenient to operate. In addition, the drainage cover is connected with the diver's helmet, which limits the diver's flexibility

The underwater welding research group of South China University of Technology has successfully developed a set of underwater partial dry flux-cored welding equipment and technology using a micro-drainage cover, but its operation is basically in a blind welding state, and the welding arc and molten pool cannot be observed. The swing of the welding torch cannot be realized, and there is water in the arc area at the beginning of welding, which affects the welding quality

The local dry automatic welding drainage device invented by Beijing Institute of Petrochemical Technology uses an underwater welding camera and an automatic light-shielding welding lens to realize automatic welding for the first time. However, the welding torch and the cover are connected flexibly, so it cannot swing stably and regularly. The structure is too simple, which affects the stability of the welding arc, and the sealing body composed of the gasket and the rubber skirt is not easy to achieve a good drainage effect during groove welding or large fillet welding, and the stability of the welding process cannot be guaranteed, and the consumption of drainage gas volume is still large

[0006] At present, there are still some shortcomings in the underwater local dry automatic welding method: (1) The influence of welding smoke cannot be well eliminated, and the camera shooting quality is reduced

(2) When performing groove welding or large fillet welding, it cannot be guaranteed that there is no water in the welding area, which will affect the welding quality

(3) Because the cooling rate is too fast, the molten pool is not easy to spread, and it is easy to cause defects such as incomplete fusion between the weld bead and the base metal or weld bead

(4) The size of the drainage cover is too large to reach the welding repair area with small space, so it cannot be repaired

(5) The consumption of drainage gas is very large, and a large number of gas storage bottles need to be carried

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