Welding method of flange plate of q390d steel crane girder in heavy work system

A welding method and flange plate technology are applied in welding equipment, workpiece edge parts, gas flame welding equipment and other directions, which can solve the problem that welding methods cannot be borrowed, simplify the post-welding heat treatment process, improve impact toughness, and reduce cold cracks. the effect of

Active Publication Date: 2017-03-08
CHINA 19TH METALLURGICAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large difference in alloy composition between Q390D steel and Q345, Q370qE steel, the welding method used for Q345, Q370qE steel components cannot be borrowed from Q390D steel

Method used

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  • Welding method of flange plate of q390d steel crane girder in heavy work system
  • Welding method of flange plate of q390d steel crane girder in heavy work system

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. like figure 1 As shown, the flange plate welding method of the heavy duty Q390D steel crane girder of the present invention is to cut the Q390D steel plate with a thickness of 50 to 60mm into a flange plate weldment of H-shaped steel, and then fully penetrate butt weld the flange Welding parts of flange plates are made into flange plates, including making flange plate weldments, making grooves at welded joints, dehumidifying flange plate weldments, making flange plates from full penetration butt welded flange plate weldments, welding There are five steps in seam heat preservation and slow cooling treatment, as follows:

[0029] Step 1. Making flange plate weldments: Cut the Q390D steel plate to be cut with a thickness of 50-60mm into flange plate weldments of predetermined specifications by using a numerical control flame cutting machine.

[0030] Durin...

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Abstract

The invention discloses a flange plate welding method for a heavy derrick Q390D steel crane beam. A Q390D steel plate with the thickness of 50-60 mm is cut to be flange plate welding parts for H-shaped steel, and then the flange plate welding parts are welded in a butting and full penetration mode to form a flange plate. The method comprises the five steps of manufacturing flange plate welding parts, forming grooves in a welding connector, dehumidifying the flange plate welding parts, welding the flange plate welding parts in the butting and full penetration mode to form the flange plate, and performing heat preservation and slow cooling on a welding joint. According to the flange plate welding method, no preheating working procedure performed before welding or heat preservation working procedure performed after welding is provided, the automatic submerged arc welding multi-layer and multi-pass welding technology is adopted, the welding automation degree is high, few cold cracks exist in a welding joint structure, the welding quality is high, the labor intensity of welding work is low, the welding cost is low, and welding time is greatly shortened, so that the welding technology meets the requirement for the heavy level better on the whole, particularly the heavy derrick crane beam flange plate welding requirement.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for welding flange plates of heavy-duty Q390D steel crane girders. Background technique [0002] The national standard "Code for Design of Cranes" (GB / T3811-2008) divides cranes into four levels: light, medium, heavy, and extra-heavy according to the frequency with which the load of the crane reaches its rated value. The hook bridge crane is the heavy class, and the metallurgical bridge crane is the super heavy class. For setting the above-mentioned crane girder, it is correspondingly divided into light grade, medium grade, heavy grade and extra heavy grade. The crane beam is a beam frame that provides support for lifting heavy objects in industrial plants. The crane rail is fixedly arranged on the crane beam, and the driving is movably arranged on the crane rail. The crane girder includes a web and flange plates arranged at both ends of the web, and stiffener plates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K28/02B23K7/00B23K9/18B23K9/235B23K33/00
CPCB23K7/00B23K9/18B23K9/235B23K28/02B23K33/00B23K2101/28
Inventor 陈川宝
Owner CHINA 19TH METALLURGICAL CORP
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