Repairing Technology of Welding Cracks in Bearing Housing of Jack-up Drilling Platform

Abstract

The invention discloses a repairing technology of a welding crack of a bearing pedestal of a self-elevating drilling platform. The repairing technology comprises the following steps that one, preheating is carried out in a welding zone of the bearing pedestal and a web plate of a T-shaped ribbed plate, subsequently a connection welding seam between the bearing pedestal and the web plate is disconnected, the remaining welding seam is left on the bearing pedestal, then a connection welding seam between the web plate and a panel is planed open, and then the remained welding seam is polished to the surface of the bearing pedestal; two, a surface overlaying zone of the bearing pedestal is preheated, subsequently a transition layer is overlaid on the surface of the bearing pedestal, postheat treatment is carried out immediately after the transition layer overlaying is completed, and then the transition layer is slowly cooled to the environment temperature; and three, a groove is formed in the web plate, integrated preheating is carried out in the welding zone of the bearing pedestal and the web plate, then the web plate and the bearing pedestal are welded, then a connection welding seam of the panel and the web plate is welded, and the postheat treatment is carried out immediately after the welding is completed. With the adoption of the repairing technology, the generation of the welding crack can be controlled effectively, and the manufacturing quality of the self-elevating drilling platform is guaranteed.

Description

technical field [0001] The invention relates to a repairing process for welding cracks of a bearing seat of a self-elevating drilling platform. Background technique [0002] Welding technology is one of the key technologies of modern ship engineering. The welding work in shipbuilding accounts for about 40% of the total man-hours of shipbuilding, and the quality of welding directly reflects the quality of shipbuilding. Since there are many types of marine steel and welding materials are updated rapidly, the welding process also needs continuous improvement. The web plate 2 of the medium and high strength T-shaped rib plate of the upper base of the jack-up drilling platform is welded to the bearing housing 1 (see figure 1 shown). The material of the bearing seat 1 is A514 high-strength weldable steel plate with a plate thickness of L=265mm, and the material of the web plate 2 is EQ47 high-strength ship plate with a carbon equivalent of 0.77%. When the carbon equivalent is ...

AI Technical Summary

Problems solved by technology

[0005] 2. Influence of hydrogen content in welded joints

If the workpiece cools too fast, the hydrogen does not have time to escape from the weld, resulting in severe delayed cracking

[0007] 3. Influence of restraint stress on welded joints

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