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Welding method of double-metal composite pipe

A bimetal composite pipe and welding method technology, applied in metal processing, welding equipment, metal processing equipment and other directions, can solve the problems of high welding cost, low quality of joints, poor corrosion resistance of welding seam, etc., and achieve low welding cost and welding. The effect of good quality and high corrosion resistance

Active Publication Date: 2017-05-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] In order to overcome the defects in the prior art, the present invention provides a welding method for bimetallic composite pipes (including mechanical composite pipes and metallurgical composite pipes), which can solve the problems of high welding costs, low joint quality and welding problems of bimetallic composite pipes. Seam corrosion resistance and other problems

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Embodiment Construction

[0015] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The welding method of the bimetal composite pipe includes the following steps:

[0016] Step 1. Welding groove treatment, the treatment process is as follows:

[0017] 101. The welding surface of the bimetallic composite pipe base layer 1 is processed by machining. The groove form is a Y-shaped groove, the single-side groove angle β is 30°±5°, and the blunt edge thickness h is 2~4mm, see details figure 1 ;

[0018] 102. Groove cleaning: Use a wire brush and alcohol to grind and scrub the groove and its vicinity within 25cm to prevent harmful effects of oil and rust on the weld;

[0019] 103. Groove pairing: check the processing quality of the groove, ensure that the groove and its surrounding areas are intact, and then perform the groov...

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Abstract

The invention discloses a welding method of a double-metal composite pipe. The welding method comprises the following steps: (1) welding groove treatment: a basic welding surface is machined; a groove is a Y-shaped groove; a single-edge groove angle beta is 30+-5 degrees; and an obtuse edge thickness h is 2-4 mm; (2) prewelding: the TIG or MIG welding is performed; and a lining layer is prevented from being molten in the welding process; (3) the fill welding is performed; (4) welding of the lining layer: the low-current TIG welding is adopted; and (5) the cover surface welding is performed. The welding method improves the joint corrosion resistance, and is simple and convenient in welding process, high in welding efficiency, low in welding cost, free of crisp and hard layers in welding lines and excellent in welding line quality.

Description

technical field [0001] The invention belongs to the field of welding engineering, and in particular relates to a welding method for a bimetal composite pipe. Background technique [0002] Bimetallic composite pipe is based on carbon steel or low alloy steel, with stainless steel or nickel-based alloy as the inner lining, through a specific forming process, combined to form a composite steel pipe, mainly divided into mechanical composite pipe and metallurgical composite pipe. It integrates the mechanical properties of the base pipe and the anti-corrosion performance of the corrosion-resistant alloy of the lining pipe, and has been widely used in petroleum, chemical and electric power industries in recent years. Due to the limitation of its spatial structure, the existing bimetal composite pipe welding adopts a single-side welding process, that is, the cladding layer is welded first, the transition layer is welded, and the base layer is welded last. There are usually two ways...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/173B23K9/235B23K9/23
CPCB23K9/167B23K9/173B23K9/23B23K9/235B23K2103/166B23K2101/06
Inventor 韩彬王勇韩浩李立英赵卫民李美艳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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