Overall heating automatic welding process of spud leg main coil of offshore drilling platform and special tool of overall heating automatic welding process

Abstract

The invention relates to an overall heating automatic welding process of a spud leg main coil of an offshore drilling platform and a special tool of the overall heating automatic welding process. The process steps include that after a primary preheating, toothed bars and string pipes on two sides of the toothed bars are positioned and are subjected to a backing weld by the special tool; primary postweld treatment is performed, a backing weld seam is subjected to an appropriate polishing, and then the backing weld seam is subjected to a heat magnetic particle inspection after the polishing; a secondary preheating is performed, and the toothed bars and the string pipes which are subjected to the backing weld are placed in an electric furnace to be preheated again; a secondary welding is performed, an automatic submerged arc welding is utilized to perform filling and capping on the toothed bars and the string pipes which are subjected to the preheating again; and finally heat treatment is performed. By means of a mode of combining a plurality of times of the preheating and welding, and by means of reasonable control of welding temperatures and speeds, the manufacturing of spud leg main coil of the offshore drilling platform is achieved, and design requirements of welding qualities, welding deformation control and postwelding dimensional accuracy are met, so that the production efficiency and welding qualities are remarkably improved, and an effective and practical producing and manufacturing mode is provided for the production of a spud leg main coil of a self-elevating drilling platform.

Description

technical field [0001] The invention relates to a processing technology of the main spiral pipe of the pile leg of the ocean drilling platform, and also relates to a special tool for realizing the overall heating and automatic welding process of the main spiral pipe of the pile leg of the ocean drilling platform. Background technique [0002] With the accelerated pace of ocean development, the development prospects of the ocean engineering equipment industry are getting brighter and brighter. In the offshore engineering equipment industry, the technical level of the drilling platform is the highest. The main coil of the offshore platform leg is the key component of the jack-up offshore drilling platform. Its structure is as follows: figure 1 , 2 , 3, mainly includes the rack 1 in the middle and the semicircular chord 2 on both sides of the rack 1, the chord 2 and the rack 1 are welded and fixed, the product has a large load bearing, high dimensional accuracy requirements, a...

AI Technical Summary

Problems solved by technology

In the offshore engineering equipment industry, the technical level of the drilling platform is the highest. The main coil of the offshore platform leg is the key component of the jack-up offshore drilling platform. Its structure is as follows: figure 1 , 2 , 3, mainly includes the rack 1 in the middle and the semicircular chord 2 on both sides of the rack 1, the chord 2 and the rack 1 are welded and fixed, the product has a large load bearing, high dimensional accuracy requirements, and difficult welding characteristics, difficult to manufacture

[0003] At present, in the manufacture of traditional pile leg main coils in China, manual electrode arc welding is mostly used for welding the chords and racks, which has low welding efficiency, high labor intensity for welders, high technical requirements, difficult control of welding accuracy, and poor working environment. Disadvantages such as high production costs

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