Single-arc twin-wire pipeline all-position welding method

A technology of single-arc double wire and welding method, which is applied to welding equipment, arc welding equipment, tubular objects, etc., can solve the problems of difficult adjustment and welding seam fusion welding parameters, etc., so as to increase filling amount, shorten welding time, improve The effect of welding speed

Active Publication Date: 2012-07-18
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] In order to solve the problems that the weld seam is not easy to fuse and the welding parameters are not easy to adjust in the existing automatic welding process of all-position pipelines, the present invention provides a single-arc double-wire pipeline all-position welding method. The method includes: two pipelines to be welded The pipe ends are grooved separately, and the grooves of the two pipes are matched by the pipe inner mouthpiece; the pipe mouth to b

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  • Single-arc twin-wire pipeline all-position welding method
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  • Single-arc twin-wire pipeline all-position welding method

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[0013] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] In the pipeline automatic welding process, due to the high welding current density of the single-arc double-wire non-rotating pipeline girth weld all-position automatic welding machine, the natural melting width of the molten pool is large, so it can be used to solve various defects in the weld, and also It has the characteristics of wide adaptable range of welding parameters and high construction efficiency. The embodiment of the present invention uses the welding process of the automatic welding machine to realize all-position welding of single-arc double-wire pipelines, so as to solve defects such as weld incomplete fusion, slag inclusion and air holes in the existing all-position automatic welding process. The following is an example of an oil and gas pipeline with a wall thickness of 17.5mm, a diameter of Φ1016, an...

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Abstract

The invention discloses a single-arc twin-wire pipeline all-position welding method, which belongs to the technical field of oil-gas pipeline welding. The method includes the steps: chamfering ends of two pipelines to be welded, and aligning grooves of the two pipelines through an inner pipeline aligning device; preheating pipe orifices to be welded to reach the temperature higher than 50 DEG C, and setting welding parameters of a single-arc twin-wire pipeline all-position automatic welding machine; and respectively performing root welding, heat welding, filling welding and cosmetic welding for the pipe orifices to be welded from inside to outside by the aid of the single-arc twin-wire pipeline all-position automatic welding machine until the circumferential surface of a welding line is not lower than the outer wall surface of each pipeline. The single-arc twin-wire pipeline all-position welding method can be used for simultaneously melting double welding wires in the same melting area, increasing the filling quantity of the welding wires within unit time, shortening welding time, increasing welding speed and improving the daily welding efficiency for circumferential weld of a unit.

Description

technical field [0001] The invention relates to the technical field of welding of oil and gas pipelines, in particular to an all-position welding method for single-arc and double-wire pipelines. Background technique [0002] With the development of my country's energy industry, the construction of oil and gas pipeline projects has ushered in another peak period. Central Asia, China-Kazakhstan, China-Russia, the Second West-East Gas Pipeline, the Third West-East Gas Pipeline, and the Fourth West-East Gas Pipeline have started construction or are under planning. [0003] At present, oil and gas pipeline welding has transitioned from manual welding to semi-automatic welding and automatic welding. Automatic welding has fast welding speed, high efficiency, and simple operation, which reduces the labor intensity of welders. With the popularization and application of pipeline automatic welding technology and equipment in pipeline construction, all-position automatic welding techno...

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Application Information

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IPC IPC(8): B23K9/028B23K9/16B23K33/00B23K101/06
Inventor 张锋尹铁马志峰张毅王长江胡立新张连宇张建平赵磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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