Pulsed switch-on preheating flash butt welding process for steel rims of heavy trucks

A heavy-duty vehicle and welding process technology, applied in welding equipment, resistance welding equipment, manufacturing tools, etc., can solve problems such as high scrap rate and defective rate, high defect rate, cracking of wheel rim after welding, etc., and achieve a high degree of automation Effect

Inactive Publication Date: 2011-06-29
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a pulse preheating flash welding process for heavy-duty automobile steel rims, which overcomes the cracking of the rim after welding in the prior art, and cracks may occur in the post-welding processing such as flaring, rolling, and expansion. , high scrap rate and defective rate, etc., to solve the problems of low efficiency, high defect rate, and unstable quality in the welding process of heavy-duty automobile steel rims

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The process of producing heavy-duty truck rims with 6mm thick steel with a tensile strength of 540MPa is as follows: cutting strips—rolling—flash butt welding—trimming (slag scraping)—flaring—rolling—expanding and shaping—punching door holes—extruding burrs— Air leak check - rim. Blanking size 305mm (width) × 1710mm (length), welding allowance 50mm, welding voltage 10.8V, upsetting amount 6.6mm, preheating power-on time 9 times × 0.1s, pulse period 0.5s, flash time 14s, upsetting The charging time is 0.3s, the formability after welding is good, and the crack rate is 0.

Embodiment 2

[0016] The process of producing heavy duty truck rims with 6.75mm thick steel with a tensile strength of 490MPa is as follows: cutting strips—rolling—flash butt welding—trimming (slag scraping)—flaring—rolling—expanding and shaping—punching door holes—squeezing burrs —Air leak check—Rim. Cutting size 305mm (width) × 1680mm (length), welding allowance 50mm, welding voltage 10.8V, upsetting amount 6.6mm, preheating power-on time 8 times × 0.1s, pulse period 0.8s, flash time 16s, upsetting The charging time is 0.8s, the formability after welding is good, and the crack rate is 0.

Embodiment 3

[0018] The production process of heavy-duty truck rims using 7.8mm thick steel with a tensile strength of 380MPa is as follows: cutting strips - rolling - flash butt welding - trimming (slag scraping) - flaring - rolling - expansion shaping - punching door holes - squeezing burrs —Air leak check—Rim. The blanking size is 305mm (width)×1680mm (length), the welding allowance is 50mm, the welding voltage is 14.6V, the upsetting amount is 8mm, the preheating time is 8 times×0.1s, the pulse period is 1.2s, the flash time is 25s, and the upsetting is charged The time is 0.9s, the formability after welding is good, and the crack rate is 0.

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Abstract

The invention discloses a pulsed switch-on preheating flash butt welding process for steel rims of heavy trucks, which belongs to the technical field of welding, and comprises the steps of blanking, reeling, flattening, welding condition setting, fitting, pulsed flash preheating, continuous flash, charged upsetting, pressure maintaining, clamp loosening, deburring, and the like. The process is characterized by comprising the controlled process parameters as follows: the overhanging length is 20-50mm; the flash allowance is 5-12mm; the upset allowance is 5-10mm; the upset force is (2-3)*105 N; the clamp force is (3-6)*105 N; the pulsed switch-on preheating process is (4-10) times*(0.5-1.2) s, (0.1- 0.2) s per pulse; the preheating and welding voltage is 10.8-14.6 V; the flash time is14-30s; and the upset charged time: 0.3-2s. The process disclosed by the invention has the advantages that the degree of automation is high; the process is suitable for welding steel rims (thickness: 3-8mm, width: 300-400mm) of heavy trucks, and after the welded steel rims are sequentially subjected to trimming, flaring, roll shaping and expanding, the welded joints have no crack defect.

Description

technical field [0001] The invention belongs to the technical field of welding technology, and in particular relates to a pulse preheating flash welding technology for heavy-duty automobile steel rims. Background technique [0002] The performance of the wheel not only affects the driving safety and handling stability of the car, but also its own weight has a great impact on fuel consumption. As an important part of the car driving system, the wheel requires reliable welding quality, small deformation, and Sufficient resistance to fatigue fracture. [0003] Using the existing technology of non-preheating continuous flash welding process to weld heavy-duty automobile steel rims is prone to cracking of the rim after welding, cracking may occur in the processes of flaring, rolling, and expansion after welding, and the rate of scrap and defective products higher. Contents of the invention [0004] The purpose of the present invention is to provide a pulse preheating flash we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/04B23K11/34
Inventor 董现春周志伟章军蒋万标崔阳杨光伟赵林马峰孙鹏峰张熹张楠
Owner SHOUGANG CORPORATION
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