Upright full-automatic argon arc welding process for bimetal composite pipes

Abstract

The invention discloses an upright full-automatic argon arc welding process for bimetal composite pipes. The process comprises the following steps: (1) the preparation is performed before welding; (2)the bottoming welding is performed; and the upright welding is performed in bottoming from the position of 6 o'clock to the position of 12 o'clock; (3) the welding process is divided into a hot welding bead and filling; the upright welding is performed in the hot welding bead and the filling from the position of 6 o'clock to the position of 12 o'clock, wherein the peripheral angles of pipe bodiesare divided into four sections; the filling is divided into multiple layers according to different wall thicknesses; and each layer is once welded; (4) a cover surface is adopted in the welding process, and is uprightly welded from the position of 12 o'clock to the position of 6 o'clock; and (5) nondestructive detection is performed after welding. The process solves the full-automatic all-position welding demand problem, reduces welding procedures, saves welding materials, greatly reduces the production cost and the labor intensity of workers, and improves the welding quality and efficiency of bimetal composite seabed pipelines.

Description

technical field [0001] The invention relates to a welding process, in particular to a vertically automatic argon arc welding process for bimetal composite pipes. Background technique [0002] At present, the welding of land bimetallic composite pipes mainly adopts manual inert gas tungsten argon arc welding or a combination of manual inert gas tungsten argon arc welding and manual arc welding. However, the welding efficiency of these two methods is relatively low and cannot meet the high-efficiency requirements of offshore construction; in order to improve the above-mentioned welding process, a semi-automatic vibrating wire-feeding tungsten argon arc welding process is adopted, which can well complete the task of laying sea pipes. Semi-automatic vibration Compared with the traditional manual argon arc welding process, the wire-feed argon arc welding process has greatly improved the welding quality and welding speed; however, the above-mentioned welding process still has limi...

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Problems solved by technology

[0003] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and to provide a vertically automatic argon arc welding process for bimetallic composite pipes, which adopts the technical measures of combining narrow gap bevel and vibrating wire feeding stirring process , solves the problem of fully automatic all-position welding; not only reduces the welding process and saves welding materials, but also greatly reduces the production cost and labor intensity of workers, and effectively improves the welding quality and efficiency of bimetallic composite submarine pipelines

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