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
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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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