Research on Welding Cracks in Wheel Steel Caused by Quenching Stress
Microstructural analysis and energy spectrum analysis were conducted on the cracks in the wheel steel where welding cracks occurred.The detection results showed that the grain growth in the welding heat affected zone was severe,and the welding seam position was rapidly cooled from high temperature to room temperature after welding,with a fast cooling rate,resulting in significant quenching stress.Finally,a large area of grain cracks was generated at the welding seam position,leading to welding cracks.After the user completes the wheel rim welding process,the welding current range is set to 7 800～9 500 A,the forging time is 0.2 seconds,and the weld position is air-cooled or slowly cooled,greatly improving the welding quality of wheel steel products and reducing the probability of welding cracks.
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