Thin-wall stainless steel double-layer and carbon steel base layer composite tube girth weld welding method

A welding method and stainless steel technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve problems such as bad structure and cracks, and achieve the effect of increasing effective thickness, ensuring corrosion resistance and high strength

Active Publication Date: 2008-01-09
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a thin-walled stainless steel clad layer and carbon steel base layer composite pipe girth weld welding method, to solve the technical problems of bimetal composite pipe girth weld welding stainless steel clad layer and carbon steel base layer, to overcome the existing welding The technology is not suitable for the welding of composite pipes with a cladding thickness of less than 2 mm; the use of stainless steel welding materials with the same composition as the cladding will cause a certain amount of martensitic hardening poor structure after the sealing weld is diluted by the base carbon steel, resulting in lack of crack

Method used

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  • Thin-wall stainless steel double-layer and carbon steel base layer composite tube girth weld welding method
  • Thin-wall stainless steel double-layer and carbon steel base layer composite tube girth weld welding method

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Embodiment 1

[0025] Embodiment 1: refer to accompanying drawing 1. The relative welding of bimetal composite pipes with an outer diameter of φ114 mm is taken as an example to illustrate. The thickness of the carbon steel base layer is 12 mm, and the thickness of the stainless steel cladding layer is 1.5 mm.

[0026] (1) Groove processing

[0027] Use the machining method to process the groove at the pipe end with an angle of 30° and a blunt edge of 5 mm. Use a grinding wheel to polish the rust on the carbon steel near the groove, and clean the oil on the groove with acetone.

[0028] (2) Seal welding

[0029] Weld 2-3 layers of stainless steel on the groove close to the inner surface of the bottom sealing bead. The welding method is argon tungsten arc welding, using 309Mo type austenitic stainless steel wire, the model is ER309MoL, the grade is HOOCr24Ni13Mo2, and the diameter is 2 mm. After welding, use a grinding wheel to grind the groove, the angle is 30-35 degrees, and the blunt ed...

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Abstract

The process of ring welding composite pipe comprising one thin stainless steel layer and one carbon steel base layer includes the following steps: 1. chamfering and eliminating oil stain; 2. bead welding and trimming chamfer; 3. pairing bimetal composite pipe chamfers; 4. argon shielded tungsten arc welding in the bottom; 5. welding the second layer to weld the base layers of two composite pipes; and 6. filling welding and finishing welding. During the welding process, stainless steel electrode and 309 or 309Mo welding material are adopted for reaching high strength and high toughness of the weld seam, and the chamfers have increased effective thickness of stainless steel layer for high welding quality and high corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of metal material welding, and relates to a welding technology for the girth weld of a bimetal composite steel pipe, in particular to a girth weld welding of a bimetal composite pipe whose cladding layer is thin-walled stainless steel pipe and the base layer is carbon steel technology. Background technique [0002] The bimetal composite pipe with carbon steel as the base layer and stainless steel as the cladding layer effectively solves the corrosion problem of pipelines in oil and gas transportation, oil refining, chemical industry and other industrial sectors, and has more and more applications. It is very difficult to weld bimetallic composite pipes on site, and there are two main welding techniques at present. One of Chinese Patent Publication No. is the patent application of CN1354061A. Firstly, weld the cladding layer on the inner wall, and then weld the transition layer and the base layer. The weldi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/028B23K33/00B23K9/235B23K35/30B23K101/06B23K103/04
Inventor 李为卫陈志昕罗金恒赵新伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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