Welding method for high-strength steel truss-type cantilever crane

A welding method and truss-type technology are applied in the field of high-strength steel Q620E steel pipe to make high-strength steel truss-type booms, which can solve the problems of high welding cost, low strength and low welding efficiency, and achieve high welding efficiency, saving processing costs, and ensuring The effect of welding quality

Active Publication Date: 2012-06-13
WUHAN MARINE MACHINERY PLANT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the welding of high-strength Q620E steel pipe truss-type jib is still blank in China, only the welding of similar material jibs, such as WDB620, the strength of the material is 100MPa lower, or similar high-strength box structures, using ordinary Welding process method, high welding cost and low welding efficiency

Method used

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  • Welding method for high-strength steel truss-type cantilever crane
  • Welding method for high-strength steel truss-type cantilever crane
  • Welding method for high-strength steel truss-type cantilever crane

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Experimental program
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Effect test

Embodiment 1

[0027] A welding method for a high-strength steel truss-type jib. The main components of the jib, the main chord 2 and the branch pipe 3, are made of high-strength steel pipes. The specific process steps are as follows:

[0028] ① Cutting, opening intersecting lines and grooves of main chord 2 and branch pipe 3. Both the main chord 2 and the branch pipe 3 are made of high-strength Q620E steel pipe, which is low-alloy high-strength steel with a thickness of 12mm. All intersecting lines and grooves are cut by a three-dimensional automatic CNC steel pipe flame cutting machine. The cutting nozzle for flame cutting adopts 1# fast cutting nozzle (diffusion type), the distance from the cutting nozzle to the workpiece is 10mm; the throat diameter of the cutting oxygen hole is 0.2mm; the preheating flame power is 6L / min; the propane pressure is 35kPa; The pressure is 200kPa; the cutting speed is 40cm / min. The cutting speed is adjusted according to the thickness of the cutting material...

Embodiment 2

[0040] A welding method for a high-strength steel truss-type jib. The main components of the jib, the main chord 2 and the branch pipe 3, are made of high-strength steel pipes. The specific process steps are as follows:

[0041] ⑦ Cutting, opening intersecting lines and grooves of main chord 2 and branch pipe 3. Both the main chord 2 and the branch pipe 3 are made of high-strength Q620E steel pipe, which is a low-alloy high-strength steel with a thickness of 16mm. All intersecting lines and grooves are cut by a three-dimensional automatic CNC steel pipe flame cutting machine. The cutting nozzle for flame cutting adopts 1# fast cutting nozzle (diffusion type), the distance from the cutting nozzle to the workpiece is 12mm; the throat diameter of the cutting oxygen hole is 0.25mm; the preheating flame power is 7.5L / min; the propane pressure is 40kPa; The oxygen pressure is 220kPa; the cutting speed is 42cm / min. The cutting speed is adjusted according to the thickness of the cuttin...

Embodiment 3

[0053] A welding method for a high-strength steel truss-type jib. The main components of the jib, the main chord 2 and the branch pipe 3, are made of high-strength steel pipes. The specific process steps are as follows:

[0054] The blanking, intersecting lines and grooves of the main chord 2 and branch 3. Both the main chord 2 and the branch pipe 3 are made of high-strength Q620E steel pipe, which is low-alloy high-strength steel with a thickness of 20mm. All intersecting lines and grooves are cut by a three-dimensional automatic CNC steel pipe flame cutting machine. The cutting nozzle for flame cutting adopts 1# fast cutting nozzle (diffusion type), the distance from the cutting nozzle to the workpiece is 15mm; the throat diameter of the cutting oxygen hole is 0.3mm; the preheating flame power is 8.3L / min; the propane pressure is 45kPa; The oxygen pressure is 250kPa; the cutting speed is 45cm / min. The cutting speed is adjusted according to the thickness of the cutting ma...

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Abstract

The invention discloses a welding method for a high-strength steel truss-type cantilever crane. A main chord tube and a branch tube which are used as main parts of the high-strength steel truss-type cantilever crane are high-strength Q620E steel pipes. Feeding, open phase transversal and beveled edges of the steel pipes are cut and formed at one time by using a three-dimensional full-automatic numerical control steel pipe flame cutter. The main chord tube and the branch tube which are spliced are fixed by a tool plate. After local preheating, symmetrical welding and welding from the middle toboth sides and from bottom to top are adopted, flux-cored arc welding (FCAW) is adopted during welding and the arc is struck inside the beveled edge of a workpiece. The method provided by the invention not only ensures the welding quality of the high-strength steel truss-type cantilever crane with attractive appearance of welding lines, but also is simple and convenient to manufacture, is easy tocontrol welding deformation and has low welding cost.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method in which a high-strength steel truss-type arm frame is manufactured by using a high-strength steel Q620E steel pipe as a main component. Background technique [0002] With the development of the economy, more and more large-scale cranes are widely used, and the jib of the tower crane is a relatively important part of this type of crane. Large-scale tower cranes generally use lattice jibs. The largest The characteristic is that the jib is light in weight. If the jib can reduce its own weight, it can actually increase its lifting capacity, so it is of great significance. The jib of a large tower crane is subject to large and complex forces, including heavy loads, impact loads, wind loads, etc., so the jib has high manufacturing requirements, and the jib is a steel structure. Therefore, the requirements for welding quality are high. In the past, low-alloy steel such as Q345 was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23K7/00B23K37/04B23K9/00
Inventor 杨新明涂泽文华霖程文池王良董诚姜之龙雷智周通陈昌民
Owner WUHAN MARINE MACHINERY PLANT
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