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Butt welding method for thick-wall steel pipes

A welding method and technology for steel pipes, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as poor weld quality, and achieve the effects of increasing deposition rate, increasing penetration, and improving production efficiency

Inactive Publication Date: 2018-09-07
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a butt welding method for thick-walled steel pipes to solve the technical problem of poor weld quality in the existing gas shielded welding technology

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  • Butt welding method for thick-wall steel pipes
  • Butt welding method for thick-wall steel pipes
  • Butt welding method for thick-wall steel pipes

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Embodiment Construction

[0038] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0039] In the description of the present invention, unless otherwise specified, "plurality" means two or more; unless otherwise specified, "notch-shaped" means a shape other than an even cross-section. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" etc. is Based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and th...

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Abstract

The invention belongs to the technical field of welding, and particularly relates to a butt welding method for thick-wall steel pipes. The butt welding method for the thick-wall steel pipes comprisesthe following steps that the surfaces to be welded of the two thick-wall steel pipes are machined into a groove; butt welding is carried out on the surfaces to be welded of the two thick-wall steel pipes under the condition of keeping clearance, and the butted groove is positioned and welded; backing welding is carried out on the root of the butted groove, and polishing is carried out on a weldedseam generated after backing welding so that the portion, from the beginning end to the tail end, of the welded seam generated after backing welding can be narrowed in the circumferential direction ofthe thick-walled steel pipes; welded seams generated after positioning and welding are removed; and filling and welding are carried out on the butted groove, wherein in the filling and welding process, arc starting is carried out from the starting end of the welded seam generated after backing welding, and spiral welding is carried out in the circumferential direction of the thick-wall steel pipes by using a trapezoidal strip conveying mode. By the adoption of the method, the quality of the welded seams is improved, continuous welding of the butted welded seams of the thick-wall steel pipes is realized, and the production efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a butt welding method for thick-walled steel pipes. Background technique [0002] Most load-bearing parts (such as rail vehicle drawbars) are mainly formed by butt welding of two sections of thick-walled steel pipes (that is, steel pipes with a wall thickness ≥ 15mm) using gas shielded welding technology. [0003] On the one hand, due to the thicker pipe wall and lower arc starting temperature during welding, conventional MAG welding (English abbreviation for molten electrode active gas shielded arc welding) is likely to cause shallow penetration at the arc starting point and thick weld seam. In case of defects such as cracks and shrinkage holes, the arc starting and closing parts must be removed. At the same time, in order to avoid the shape mutation between the surfacing layers or the weld slag causing weld incomplete fusion and slag inclusion defects, the layers need to be po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235B23K9/028B23P15/00
CPCB23K9/0052B23K9/0282B23K9/173B23K9/235B23P15/00
Inventor 马寅孙正夏韩晓辉陈北平吴向阳田仁勇郭文俊王一霖
Owner CRRC QINGDAO SIFANG CO LTD
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