Welding method for thick-wall square steel pipe butt joint

A technology of butt joints and welding methods, applied in welding equipment, welding accessories, characteristics of welding rods, etc., can solve the problems of poor root forming, welding penetration, welding flash, etc., and achieve the improvement of welding efficiency, good appearance and improved fatigue life. Effect

Pending Publication Date: 2021-11-05
青岛中车四方轨道车辆有限公司
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Problems solved by technology

[0003] When welding thick-walled square steel pipes, MAG welding often has poor root formation, which is prone to weld penetration, welding lumps, etc., and the full penet

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  • Welding method for thick-wall square steel pipe butt joint
  • Welding method for thick-wall square steel pipe butt joint
  • Welding method for thick-wall square steel pipe butt joint

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[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0034] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the desc...

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Abstract

The invention discloses a welding method for a thick-wall square steel pipe butt joint. The welding method comprises the steps that a to-be-welded face of the square steel pipe butt joint comprises an arc-shaped section and a linear section, wherein the arc-shaped section and the linear section are connected end to end, and grooves are formed in the arc-shaped section and the linear section; the to-be-welded face of the square steel pipe butt joint and a to-be-welded face of an adjacent square steel pipe butt joint are assembled in a clearance butt joint mode; horizontal positioning welding is carried out on the grooves; bottoming welding from vertical welding to flat welding is carried out on the arc-shaped section by adopting TIG welding, and TIG welding bottoming welding is carried out on the linear section from a bottoming welding flat welding position of the arc-shaped section; filling welding from vertical welding to flat welding is carried out on the arc-shaped section by adopting MAG welding, and MAG welding filling welding is carried out on the linear section from a filling welding flat welding position of the arc-shaped section; and cosmetic welding from vertical welding to flat welding is carried out on the arc-shaped section by adopting MAG welding, and MAG welding cosmetic welding is carried out on the linear section from a cosmetic welding flat welding position of the arc-shaped section. According to the welding method for the thick-wall square steel pipe butt joint, full penetration of a circular arc transition position of a thick-wall square pipe is guaranteed, and the fatigue life of the square pipe butt joint is prolonged.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a welding method for butt joints of thick-walled square steel pipes. Background technique [0002] Thick-walled square steel pipes are being used more and more in the field of rail transit technology, and the widespread use of any metal structural material is extremely dependent on the welding technology level of this metal material. [0003] When welding thick-walled square steel pipes, MAG welding often has poor root formation, which is prone to weld penetration, welding lumps, etc., and the full penetration of the arc transition of square steel pipes cannot be guaranteed, resulting in the welding quality of square steel pipe welds. and fatigue life cannot be guaranteed. [0004] Therefore, a welding method for butt joints of thick-walled square steel pipes was developed to ensure full penetration of the arc transitions of thick-walled square steel pipes and impro...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/28B23K9/32
CPCB23K9/1735B23K9/287B23K9/32
Inventor 张泽朱亮王彦涛王强孙大森卞青华毛永文
Owner 青岛中车四方轨道车辆有限公司
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