Method for welding pile leg main board pipe

A welding method and main chord technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of high welding cost and slow welding speed, so as to reduce welding cost, improve welding speed and improve welding efficiency. quality effect

Active Publication Date: 2012-05-30
TIANJIN HOIDI OFFSHORE ENG +2
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  • Claims
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Problems solved by technology

[0003] At present, when the semicircular plate and the rack are butt welded, the common welding process is adopted, which not only has high welding cost, but also slow welding speed.

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

technical field [0001] The invention relates to a welding method for a main chord tube rack and a semicircular plate of a jack-up drilling platform pile leg. Background technique [0002] Large jack-up platforms are used for exploration and exploitation of offshore oil / gas resources, and the main body of the platform is supported by pile legs. The pile leg is triangular truss type, and the main chord pipe with rack is arranged at the triangle of the pile leg structure, and the support pipe is connected between them. The main chord consists of two opposing half-circles and a rack, which is machined by cutting. [0003] At present, when the semicircular plate and the rack are butt welded, the common welding process is adopted, which not only has high welding cost, but also has a slow welding speed. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a welding method for the leg main chord tube, which can not only mee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K28/02B23K9/16B23K9/18
Inventor 耿跃杰董学勇韩涛任文礼刘宝元张达凯简吉庆辛伟孔繁堂
Owner TIANJIN HOIDI OFFSHORE ENG
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