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Pulsed flashing butt welding method for 780Mpa-grade hot-rolled dual-phase wheel steel

A technology of flash butt welding and wheel steel, which is applied in welding equipment, resistance welding equipment, manufacturing tools, etc., can solve the problems of increased difficulty, deterioration of formability, and increased sensitivity of fatigue notches, etc., to achieve low spatter Effect

Pending Publication Date: 2021-04-06
HANDAN IRON & STEEL GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This requires that the steel for manufacturing wheels should have excellent strong plasticity, toughness, good stamping formability, weldability, fatigue resistance, corrosion resistance, etc., and it is more difficult to use high-strength steel to make lightweight wheels, because with the The strength of the steel increases, its plasticity decreases, the formability deteriorates, and the susceptibility to fatigue notch increases

Method used

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  • Pulsed flashing butt welding method for 780Mpa-grade hot-rolled dual-phase wheel steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1－6

[0031] Examples 1-6 were welded using the above-mentioned implementation method. See Table 1 for the initial burning distance, initial burning speed, burning distance, and burning speed in the pulse flash stage, and Table 1 for the upsetting distance, upsetting speed, and pressure holding time in the upsetting stage. See Table 1 for the welding cracking rate of Examples 1-6.

[0032] Table 1

[0033]

[0034] The welded joints of the wheel rims of Examples 1-6 are good, without surface defects and invisible cracks, the performance of the weld area is good, there are no quality defects of thinning and softening, and the cracking rate is within 5‰.

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Abstract

The invention discloses a pulsed flashing butt welding method for 780Mpa-grade hot-rolled dual-phase wheel steel. The thickness of a rim is 4.0-4.5 mm. The pulsed flashing butt welding comprises a pulsed flashing stage and an upsetting stage; in the pulsed flashing stage, the initial burning distance is selected to be 6-8 mm, the initial burning speed is selected to be 12-15 mm / s, the burning distance is 5.5-6.5 mm, and the burning speed is 1.0-1.5 mm / s; and in the upsetting stage, the upsetting distance is 5.7-6.4 mm, the upsetting speed is 45-55 mm / s, and the holding time is 0.2-0.4 s. According to the method, under the conditions of low splashing and high efficiency, the ultra-lightweight wheel rim without thinning and softening and with a high-quality welding joint can be obtained, and the welding cracking rate is controlled within 0.5%.

Description

technical field [0001] The invention belongs to the technical field of dual-phase steel welding, and in particular relates to a pulse flash butt welding method for 780Mpa hot-rolled dual-phase wheel steel. Background technique [0002] In recent years, with the increasing environmental problems and energy crisis, the lightweight design of automobiles has attracted more and more attention and has become an important development direction. The wheel is a relatively independent safety component of the car. During the service process, it bears the weight of the vehicle, the axial force and the torque during the driving and braking process. The superposition of various stresses makes the stress very complicated. Therefore, the wheel should have sufficient load capacity, good cushioning and air tightness, good uniformity and mass balance. This requires that the steel for manufacturing wheels should have excellent strong plasticity, toughness, good stamping formability, weldabilit...

Claims

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Application Information

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IPC IPC(8): B23K11/04B23K11/34B23K11/36C22C38/02C22C38/04C22C38/26C22C38/28C22C38/32C22C38/38
CPCB23K11/04B23K11/34B23K11/36C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/26C22C38/28C22C38/32C22C38/38
Inventor 李耀强张志强李俊生柳风林贾改风李斌李娜宁国燕
Owner HANDAN IRON & STEEL GROUP
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