Welding technology method of lifting device box in self-lifting type drilling platform

Abstract

The invention discloses a technique method of welding the body of an elevating gear in a self-elevating drilling platform. The maximum thickness of a steel plate is 76mm and the yield stress of the steel plate is 460 MPa. The gas of CO2 is adopted for protecting arc welding. Temperature is preheated to 110 DEG C before welding. Interlayer-temperature is 10 to 230 DEG C. The procedures of the welding comprises: a board, a backboard and a clapboard are welded to be integrated as a whole, and then the unit of three boards are welded on a bottom board; the close boards of both sides are welded on the bottom board. A bracing board is welded on the close board; a wing plate is welded on the close board; gaps among the wing plate, the bracing board and the bottom board are welded; and an attachment weld between the backboard and the close board is welded. The invention is able to improve the efficiency of welding processing, reduce the input of welding heat and decrease the cooling velocity of a junction, thereby solving the problem of a welding crack. The principle of even-number builder, symmetrical construction and dispersion and section construction adopted and vibration timing technique used for removing residue stress, the problems of welding cracks, welding joint mechanical property requirements and welding deformation control can be effectively solved.

Description

technical field [0001] The invention relates to a welding process, more specifically, to a welding process for a special box. Background technique [0002] The jack-up drilling platform is mainly used for the exploration and exploitation of offshore oil / natural gas resources, and its design service sea area is all kinds of sea area environmental conditions within a water depth of 122 meters worldwide. Among them, the lifting device is the equipment to realize the lifting of the platform and maintain the lifting state, its lifting capacity: 590 tons / pinion@26 hours, maximum ballast holding capacity: 968 tons / pinion. In the lifting device, the lifting device box has a supporting structure, which acts as a support, and the load of the entire platform acts on the box structure. Such as figure 1 As shown, the lifting device box includes a base plate 4, a back plate 1 and a panel 5 oppositely arranged on the base plate 4, and a sealing plate 2 arranged on both sides of the back ...

AI Technical Summary

Problems solved by technology

The problem is that the modulated steel material has high rigidity, and the problem of cracks is prominent; and the manufacturing structure requires high precision, which is very critical to the control of welding deformation

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