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Full-automatic argon arc welding method of circumferential weld of large-caliber bimetal composite pipe

A bimetallic composite pipe, argon arc welding technology, applied in welding equipment, metal processing, welding accessories, etc., to achieve the effect of refining grains, not easy to blow hole defects, and ensuring welding quality

Pending Publication Date: 2019-12-17
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and to provide an upward automatic tungsten argon arc welding method for bimetallic composite pipes, which adopts high-frequency wire-feeding vibration technology and narrow gap U-shaped welding method. The combination of groove and its combination solves the problem of full-automatic all-position welding of large-diameter bimetallic composite pipe tungsten argon arc; saves welding materials, greatly improves welding efficiency and welding quality, and greatly reduces production costs and workers labor intensity

Method used

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  • Full-automatic argon arc welding method of circumferential weld of large-caliber bimetal composite pipe
  • Full-automatic argon arc welding method of circumferential weld of large-caliber bimetal composite pipe
  • Full-automatic argon arc welding method of circumferential weld of large-caliber bimetal composite pipe

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Embodiment Construction

[0049] The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.

[0050] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

[0051] Such as Figures 1 to 5 Shown, the present invention adopts following steps:

[0052] The first step, pre-welding preparation process:

[0053] Such as figure 1 As shown, ① use a beveling machine to prepare a bevel on the bimetallic composite pipe 26, and machine the bevel; Scrub with acetone or alcohol; the groove angle 22 is 8 degrees, the half width of the opening is 6mm, and the error is ±0.1mm; the root arc 23 of the groove is a radius of 2.4mm; the root arc 23 is tangent to the blunt inner platform 24, and the blunt edge The size of the inner platform 24 is: 1.5mm±0.1mm; the thickness of the blunt edge 4 of the groove is: 1.8mm, and th...

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Abstract

The invention relates to the technical field of a full-automatic welding method of a circumferential weld of a large-caliber bimetal composite pipe, and discloses a full-automatic argon arc welding method of a circumferential weld of a large-caliber bimetal composite pipe. The method includes the following steps of firstly, making a preparation before welding; secondly, conducting root welding, wherein the root welding is conducted through a full-automatic argon tungsten-arc welding machine in the upward direction from the 6 o'clock position to the 12 o'clock position, the protection gas introduced into a welding gun is argon or mixed gas of argon and helium, the volume percentage of the helium in the mixed gas is 15-20%, the purity of the argon is larger than 99.99%, the purity of the argon for welding is not lower than 99.99%, the dew point is not higher than -50 DEG C, and the oxygen content is not larger than 500 ppm. The method has the advantages that root welding is conducted bymeans of the welding gun small-amplitude swinging process, so the back of the weld is well formed, grasping is easy, and defects can hardly appear; and hot welding and filling welding are conducted through U-type swinging adaptive to the groove type, so an electric arc can more easily reach a groove face, and the side wall non-welding problem easily appearing in an existing welding process is eliminated.

Description

technical field [0001] The invention relates to the technical field of an automatic welding method for a large-diameter bimetallic composite pipe girth weld, and relates to a fully automatic argon arc welding method for a large-diameter bimetallic composite pipe circular weld. Background technique [0002] In recent years, bimetallic composite pipes have been used in a huge amount in the oil and gas industry, especially for gathering and transportation pipelines, long-distance pipelines, and process pipelines in high-sulfur, high-chlorine, and high-carbon dioxide oil and gas fields. The use of bimetallic composite pipes in large oil and gas fields such as Tarim Oilfield and Xinjiang Oilfield Company is becoming more and more common, and the pipe diameter has been developed from small and medium diameters to large diameters. [0003] For the welding of large-diameter bimetallic composite pipes, manual inert gas tungsten argon arc welding or argon-electric combination welding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/133B23K9/28B23K9/32B23K101/06
CPCB23K9/133B23K9/167B23K9/287B23K9/325B23K2101/06
Inventor 王京高彦伟张成杰刘振洪温斌刘泽刘娅张富学
Owner BC P INC CHINA NAT PETROLEUM CORP
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