Welding construction method for super-thick plate

Abstract

The invention discloses a welding construction method for a super-thick plate. The method is reasonable in arrangement, an asymmetric X-shaped groove is adopted, low-hydrogen carbon dioxide gas shielded welding bottoming and submerged-arc welding filling capping are conducted, the multi-layer and multi-pass, narrow welding pass, thin welding layer and double-side symmetric filling welding is conducted, the welding characteristics of the super-thick plate is effectively improved, the defects such as weld pass root cracks and air holes are prevented from being generated, and the situation that the steel welding performance is stable is ensured. The cooling speed of a welding seam is reduced through flame heating and preheating, a hardening structure is prevented from being generated on a joint, and cracks are prevented from being generated. Heating treatment is conducted after welding is accomplished, so that the welding residual stress is effectively reduced or eliminated, and the welding quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of construction engineering and relates to a welding construction method for super-thick plates. Background technique [0002] In construction engineering, welding of ultra-thick plates is not very common. In the prior art, "U"-shaped grooves are generally used. This type of groove is not easy to process. CNC boring and milling machines must be used for end milling. The construction period is longer and the cost is higher. ; For extra-thick plates with larger dimensions, the processing cost increases. Furthermore, the groove is larger, the amount of weld metal filling increases, the heat input becomes larger, and the tendency of welding deformation increases, which is not easy to control the amount of deformation; at the same time, it takes a long time and costs high. [0003] Therefore, how to ensure the welding quality while controlling the construction cost within a reasonable range has become a technica...

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Problems solved by technology

[0002] In construction engineering, welding of ultra-thick plates is not very common. In the prior art, "U"-shaped grooves are generally used. This type of groove is not easy to process. CNC boring and milling machines must be used for end milling. The construction period is longer and the cost is higher. ; For extra-thick plates with larger dimensions, the processing cost increases

Furthermore, the groove is larger, the amount of weld metal filling increases, the heat input increases, and the tendency of welding deformation increases, which is not easy to control the amount of deformation; at the same time, it takes a long time and costs high

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