Friction welding method of tower crane standard section web member
A technology of friction welding and standard joints, which is applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of unsatisfactory product appearance quality, low production efficiency, and difficult processing, etc., and achieve beautiful shape, stable and reliable quality , The effect of improving the degree of welding automation
Active Publication Date: 2015-01-07
SICHUAN CONSTR MACHINERY GRP
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Problems solved by technology
Due to the need to mechanically process the steel pipe and the sealing plates at both ends for many times, there are disadvantages such as difficult processing, low production efficiency and high production cost in actual production.
And because the connecting seam is welded by hand, the appearance quality of the product is not ideal
Method used
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Embodiment Construction
[0023] The embodiments of the present invention will be described below by taking Φ76X5, Φ89X5, and Φ108X8 steel pipes as examples.
[0024] The standard section webs of the tower crane are welded by the steel pipe 1 and the end plate 2, and the friction welding method includes the following steps:
[0025] A. Preparation before welding: Saw the steel pipe 1 into shape. For the steel pipe 1 that needs to be welded at both ends, it is necessary to consider the amount of friction and deformation at both ends of the steel pipe 1 before sawing the shape. No oil, rust and other dirt; the end plate 2 is cut and blanked by means of a CNC flame cutting machine, and the side of the end plate 2 that needs friction welding is sandblasted or shot blasted to remove oil, rust and other impurities. The residual amount of dirt on the surface of the steel plate shall not exceed 5%, especially the strict decontamination on the friction weld ring of the end plate.
[0026] B. Clamp and fix the ...
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The invention discloses a friction welding method of a tower crane standard section web member. The web member is formed by welding steel pipes and an end plate. The friction heating process comprises a primary friction stage and a secondary friction stage; the rotating speed of a rotating main shaft in the primary friction stage is equal to that of a rotating main shaft in the secondary friction stage, and primary friction pressure and friction time are fixed; secondary friction pressure is larger than the primary friction pressure and is fixed, and when the total friction deformation of the primary friction stage and the secondary friction stage reaches the preset value, heating in the secondary friction stage is finished; after the secondary friction stage is finished, a rotating clamp is braked, after the main shaft for clamping the end plate stops rotating, a movable clamp for clamping the steel pipes performs feeing upsetting, and the friction welding process can be completed through upsetting and pressure maintaining. Working procedures of chamfering and boss turning in the existing process flow can be removed; the rotating speed in the friction heating stage is fixed, and operation and control are convenient; the friction deformation can be controlled, and the welding length stability of the web member can be improved; the production efficiency is improved, and the production cost is reduced.
Description
technical field [0001] The invention relates to a friction welding technology, in particular to a friction welding method for a standard section web bar of a tower crane. Background technique [0002] Friction welding is a metal solid-phase hot-press welding method. The relative friction between the two surfaces continues until sufficient heat is generated, then the friction is stopped, and the two parts are forged together under the force of the upsetting pressure to form Welding is a high-quality, high-efficiency, non-toxic and harmless welding method. [0003] The standard section is an important part of the tower crane. The existing standard section is mainly a frame structure composed of crossbeams and vertical beams. In order to further ensure the firmness of the standard section, webs are welded between the crossbeams. As an important structural component of the standard section of the tower crane, the web must frequently withstand the tensile and compressive stress...
Claims
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Login to View More IPC IPC(8): B23K20/12
CPCB23K20/122
Inventor 熊小平刘国荣侯晓芝丁建新
Owner SICHUAN CONSTR MACHINERY GRP