Method for welding pile leg main board pipe

A welding method and the technology of the main side pipe, applied in the direction of welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of slow welding speed and high welding cost, achieve the improvement of welding speed, reduce welding cost, and ensure welding quality requirements Effect

Active Publication Date: 2011-03-23
TIANJIN HOIDI OFFSHORE ENG +2
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented technology described by this inventor involves two methods: one uses both gamma ray radiation from an electric current flow through water or another liquid filled chamber called a tank with metal that produces ionizing particles when it comes into contact therewith; while the other uses laser beams instead of electrical currents for heat generation purposes. This combination helps improve the efficiency at producing high-quality weldings without requiring expensive equipment like X-ray tubes.

Problems solved by technology

This patented technical problem addressed in this patents relating to large jack up platforms that use piles supporting their own weight on sea floors or other surfaces during drilling operations involves finding ways to improve efficiency while reducing costs associated with traditional methods like arc welds.

Method used

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  • Method for welding pile leg main board pipe
  • Method for welding pile leg main board pipe

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Embodiment Construction

[0013] The present invention comprises the steps:

[0014] Step a, such as figure 1 As shown, butt the processed semicircular plate 1 with the rack 2;

[0015] Step b, heating the welding joint to 120-180°C for spot welding, the length of the spot welding is 100-150mm, and the interval is less than 300mm;

[0016] Step c. Preheat the workpiece with an electric heating plate, the workpiece is preheated to 150-180°C, and the preheating range is at least within 80mm around the weld;

[0017] Step d, control the interlayer temperature at 180±10°C, use GMAW gas shielded welding with 1-1.4mm welding wire to seal the bottom, and submerged arc welding to fill the cover with 3-5mm; when welding, the joints between the same semicircular plate and the rack are carried out simultaneously Symmetrical welding to eliminate distortion from the welding process.

[0018] By adopting the welding method combining GMAW gas shielded welding and submerged arc welding, the invention can not only e...

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Abstract

The invention discloses a method for welding a pile leg main board pipe, which comprises the following steps of: a. abutting a processed semicircular plate and a rack; b. heating a welded opening to 120-180 DEG C for carrying out positioned spot welding, wherein the length of positioned spot welding is 100-150mm, and the interval is smaller than 300mm; c. preheating a workpiece to 150-180 DEG C, wherein the preheating range is at least within 80mm at the periphery of a welding seam; d. controlling interlayer temperature to 180+/-10 DEG C, sealing by adopting a GMAW (Gas Metal Arc Welding) wire of 1-1.4mm and filling a cover surface in 3-5mm by submerged arc welding; and when welding, synchronously carrying out symmetrical welding on a joint of the same semicircular plate and the rack to eliminate deformation generated in the welding process. By adopting a welding method combining GMAW and submerged arc welding, the invention not only can meet the requirement of welding quality, but also can greatly reduce the welding cost and greatly improve the welding speed.

Description

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Claims

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Application Information

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Owner TIANJIN HOIDI OFFSHORE ENG
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