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Double pipe welding method

A welding method and double-layer pipe technology, which are applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of low project acceptance rate, slow construction progress, and difficult construction, so as to improve the one-time pass rate, The effect of reducing processing requirements and reducing construction difficulty

Active Publication Date: 2019-05-03
JIANGNAN SHIPYARD GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the above, the purpose of the present invention is to provide a welding method for double-layer pipes, which is used to solve the problems of difficult construction, slow construction progress and low pass rate of project inspection in the prior art

Method used

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Embodiment Construction

[0040] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0041] image 3 Shown as the double-layer tube structure of this embodiment, the double-layer tube includes an inner tube 200 and an outer tube 100 , the inner tube 200 includes a left inner tube 201 and a right inner tube 202 , and the outer tube includes a left outer tube 101 and a right outer tube 102 . The outer tube 100 is connected through the outer tube sleeve 300, and the fitting gap 103 between the outer tube 100 and the oute...

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Abstract

The invention discloses a welding method for a double-layered tube. The welding method comprises the following specific steps of preparing the double-layered tube, wherein the double-layered tube comprises an inner tube and an outer tube, the outer tube is sleeved with an outer tube sleeve, the inner tube comprises a left inner tube and a right inner tube, and the outer tube comprises a left outer tube and a right outer tube; attaching and aligning end faces of the left inner tube and the right inner tube, reserving a gap between the left outer tube and the right outer tube, moving the outer tube sleeve onto the left outer tube or the right outer tube, and exposing the gap between the left outer tube and the right outer tube; performing application for inspection before welding on the left inner tube and the right inner tube according to the butt welding requirement; welding a connected part of the left inner tube and the right inner tube; polishing and cleaning a weld joint of the welded inner tube; performing application for inspection before welding on the left outer tube and the right outer tube according to the overlap welding requirement; moving the outer tube sleeve to the outer side of the gap in the first step, and separately welding a connected part between the left outer tube and the outer tube sleeve as well as a connected part between the right outer tube and the outer tube sleeve; and separately polishing and cleaning a weld joint between the left outer tube and the outer tube sleeve as well as a weld joint between the right outer tube and the outer tube sleeve.

Description

technical field [0001] The invention relates to a marine double-layer pipe connection, in particular to a welding method for a double-layer pipe of a low-pressure gas pipe of a marine dual-fuel engine. Background technique [0002] At present, the connection between the outer pipes of low-pressure double-layer pipes at home and abroad mainly adopts the butt welding form, that is, the two pipe sections are directly butt welded. [0003] figure 1 As shown in , the double-layer pipe includes a double-layer outer pipe 100 and a double-layer inner pipe 200 , the double-layer outer pipe 100 is directly connected by a weld 400 , and the double-layer inner pipe 200 is directly connected by a weld 300 . [0004] However, in order to make the double-layer inner tube easy to weld, according to figure 2 As shown, a section of the outer tube 103 is generally cut out at the place corresponding to the weld seam 400 of the outer tube 100, and the outer tube 103 is cut into two in the axi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/02
CPCB23K31/027
Inventor 缪文杰刘汉军李一健包明耀楼荷妍
Owner JIANGNAN SHIPYARD GRP CO LTD
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