Narrow gap welding process method for ultra-thick plates

A welding process, narrow gap technology, used in welding equipment, welding accessories, manufacturing tools, etc.

Active Publication Date: 2020-10-27
DALIAN SHIPBUILDING IND
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Problems solved by technology

[0004] In order to solve the problems existing in the existing production and construction, the present invention provides a narrow-gap welding process f

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  • Narrow gap welding process method for ultra-thick plates
  • Narrow gap welding process method for ultra-thick plates
  • Narrow gap welding process method for ultra-thick plates

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Embodiment Construction

[0029] The invention relates to a narrow-gap welding process for ultra-thick plates.

[0030] 1. First, use flame, mechanical and other cutting methods to process the groove of the thick plate, cut into an I-shaped groove surface, check whether there are groove marks on the groove surface, and repair the groove surface if it exceeds 1mm. The groove surface is polished and smooth; CO2 gas shielded welding is used for surfacing welding at the center of both sides of the groove surface. Before surfacing welding, the thick plate needs to be preheated at 150-250°, and the welding meat of 4-8mm is surfacing , and the welding meat is polished and processed to form a raised welding strip with a cross-section approximately triangular, forming a double U-shaped groove surface without blunt edges ( Figure 7 ); Grind the groove surface after processing, and carry out PT inspection on the groove surface, and assemble after confirming that there is no defect.

[0031] 2. The two groove fa...

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Abstract

The invention provides a narrow gap welding process method for ultra-thick plates. The method comprises the steps that firstly, the end surfaces to be relatively welded of the thick plates of 100-500mm are cut into 90-degree straight tangent planes, two bevel surfaces of the thick plates to be welded face each other to form an I-shaped bevel, overlay welding is carried out at the center positionsof both sides of the bevel surfaces with CO2 gas shielded welding in advance, weld metal is ground, the center lines of the bevel surfaces form convex welding strips with approximately triangular cross sections, and the two bevel surfaces of the thick plates to be relatively welded are opposite to form an approximate double U-shaped bevel; the butt joint bevel gap of the thick plates is between 10-18 mm, and when welding, special welding guns for thick plate I-shaped bevel narrow gap welding are used for welding; when welding, the thick plates are preheated to 150-250 DEG C, and during welding, the two welding guns are used to weld symmetrically from both sides of the center of the approximate double U-shaped bevel.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to the technical field of ultra-thick plate narrow gap welding. Background technique [0002] At present, with the rapid development of bridges, pressure vessels, shipbuilding, mining equipment manufacturing and the continuous enlargement of construction equipment, the thickness of the plate is required to be thicker and thicker. Higher requirements are put forward for the welding quality, welding efficiency, welding cost and welding operability of thick plates. Conventional CO2 gas shielded welding is widely used in various fields due to its advantages of flexible operation, stable welding quality and high welding efficiency. In CO2 gas shielded welding, V-shaped and X-shaped grooves are usually used to meet the welding technical requirements of thick plates. This type of groove can be used for welding plates with a thickness below 50mm, but when welding ultra-thick plates , not ...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/28B23K9/32
CPCB23K9/16B23K9/285B23K9/32
Inventor 朱先波曾嵘孙悦严石魏振宇赵成治
Owner DALIAN SHIPBUILDING IND
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