Longitudinal seam welding process for offshore wind power tower steel plate structure

Abstract

The invention relates to a longitudinal seam welding process for an offshore wind power tower steel plate structure. The longitudinal seam welding process comprises the steps that S1, a special steel plate welding device is positioned; S2, the surface of the steel plate is cleaned; S3, the two steel plates are positioned on the rigid bottom plate, the opposite end faces of the two steel plates are flush with the end faces of the two sides of the inner wall of the groove body, and clamping and positioning of the two steel plates are achieved through a steel plate lateral clamping set and a steel plate axial clamping set; S4, the telescopic column descends to enable the stirring shaft to be placed in any groove body, the stirring shaft makes contact with the opposite end faces of the two steel plates, the lower end face of the shaft disc makes contact with the upper end faces of the two steel plates, and the stirring shaft is driven by the driving set to form a welding seam in a longitudinal seam between the two steel plates from the groove body of one clamping body to the groove body of the other clamping body at the rotating speed of 800-900 r / min; and S5, a cutting blade is adopted to cut the weld joint along the radial position between the clamping body and the two steel plates. The method has the following advantages that the welding quality and the structural strength of the welded shell ring are guaranteed, the welding procedure is simplified, and the welding efficiency is improved.

Description

Technical field: [0001] The invention relates to the field of tower welding, in particular to a longitudinal seam welding process for steel plate structures of offshore wind power towers. Background technique: [0002] The wind power tower is the pole of wind power generation. It mainly plays a supporting role in the wind power generation unit and absorbs the vibration of the unit at the same time. The production process of the wind power tower generally includes: CNC cutting machine blanking, thick plate beveling, plate rolling machine It is rolled into a circle to form a tube section, and the wind power tower is formed by welding the circular seam between multiple tube sections. In the process of making the barrel joint, the longitudinal seam welding of the steel plates is an extremely important step, especially for the barrel joint with a larger diameter, multiple steel plates are required for longitudinal seam welding and then rolling. [0003] At present, when welding ...

AI Technical Summary

Problems solved by technology

[0003] At present, when welding multiple steel plates, it is necessary to perform groove opening treatment on the longitudinal seam and circumferential seam of two adjacent steel plates, and then perform welding. During welding, the two steel plates are initially positioned by spot welding, and It is difficult to ensure the levelness of the two steel plates at the longitudinal seam. Therefore, the two steel plates after spot welding are forcibly fixed at the longitudinal seam, resulting in internal stress concentration. The welding quality is not stable, there are phenomena such as welding porosity, due to the existence of internal stress at the longitudinal seam, the structural strength of the cylindrical joint formed after the subsequent longitudinal seam welding is unstable; secondly, in order to ensure the welding quality, it is necessary to The steel plate is located on both sides of the longitudinal seam to weld the lead-out plate and the arc-starting plate. After the welding of the longitudinal seam is completed, the lead-out plate and the arc-starting plate need to be cut and removed from the side ends of the steel plate (circumferential seam position), which increases the process and at the same time The lead-out plate and the arc strike plate are welded at the circular seam of the steel plate. The welding stress concentration at the circular seam of the steel plate will affect the structural strength of the circular seam when the circular seam welding is performed on multiple cylindrical sections after the subsequent rounding.

Images