Weld mouth structure of steel tube weld

Abstract

The invention provides a welding bore structure for welding a steel pipe, the welding bore structure comprises a steel plate and a symmetrical X-type groove; wherein, the X-type groove is formed at two corresponding welding points of the steel plate, half of X-type grooves which are respectively formed at two corresponding welding points of the steel plate are butted and formed, the butting position of the groove adopts the root face, the gap between two root faces adopts the root gap, the angle of the groove included angle is 60 degrees plus or minus 5 degrees, and the distance from the middle point of the root face to the surface of the steel plate is half of thickness of the steel plate. The invention has the advantages that the thickness of the root face is 3 to 5 mm; and the root gap is 0 to 1 mm; therefore, the design of the welding bore structure is reasonable, the welding sequence can be reduced, the welding materials are saved, the welding efficiency and the welding quality are enhanced, the welding cost is reduced, and the work environment is optimized to ensure the healthy body of the operating personnel.

Description

technical field [0001] The invention relates to a welding joint, in particular to a steel pipe welding process used in the welding process of jacket and block construction in marine engineering, which can reduce welding processes, save welding materials, reduce costs, and improve welding quality and operation. Weld joint construction for efficient steel pipe welding. Background technique [0002] Steel pipe rolling is a commonly used operation in many projects. Generally, steel pipes with a diameter of more than 406 mm are rolled and lengthened by steel pipes. Therefore, the workload of steel pipe rolling and lengthening in various projects is very large, and the steel pipes The quality and efficiency of rolling and lengthening will directly affect the quality of the project. For example, in offshore engineering, steel pipe rolling and extension account for about 40% of the total jacket construction workload and about 15% of the module construction workload. Moreover, in m...

AI Technical Summary

Problems solved by technology

The design of the welding joint structure of this kind of welding is not reasonable, the length of the blunt edge is set to be small, and the distance 4 from the midpoint of the blunt edge to the steel plate surface is 1 / 2 of the thickness of the steel plate, resulting in a large groove area, resulting in the consumption of welding consumables Large quantity; In addition, due to the large root gap setting, there are many welding procedures, including back sealing on the inner side of the groove, submerged arc welding with a 2.4mm diameter welding wire on the inner side, submerged arc welding with a 4.0mm diameter welding wire on the inner side, root cleaning and grinding on the outer side of the groove As well as steps such as submerged arc welding with a 4.0 mm diameter wire on the outer side, due to many steps, it is cumbersome and the work efficiency is low. During the welding process, it is easy to burn through the groove when welding the front side, and the phenomenon that the blunt edge is not penetrated when welding the reverse side, thus affecting welding. Moreover, due to the large root gap setting, gouging is required to remove the back sealing weld bead, resulting in waste of welding materials, and after gouging, the gouging angle is small, and it is difficult to remove slag after welding; also, gouging The noise is very loud, and a lot of smoke and dust will be generated at the same time. The working environment is poor, which affects the health of the workers.

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