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

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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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 be welded is preheated to above 50°C, and the welding parameters of the single-arc double-wire pipe full-position automatic welding machine are set. ;Use the full-position automatic welding machine for the single-arc double-wire pipeline to carry out root welding, heat welding, filling welding and cover welding from the inside to the outside of the pipe mouth to be welded until the circumferential surface of the weld is not lower than the pipeline outer wall surface

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