EFFECT OF ELECTRON BEAM WELDING ON FATIGUE CRACK GROWTH RATE IN AISI 4130 STEEL |
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| Authors: | Ji-Liang Doong Jing-Ming Chi Jiun-Ren Hwang |
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| Affiliation: | Department of Mechanical Engineering, National Central University, Chung-Li, Taiwan 32054, R.O.China |
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| Abstract: | Abstract— The purpose of this study is to investigate the effect of electron beam welding parameters on fatigue crack growth rate in AISI 4130 steel. The welding method was carried out by using nonoscillation and oscillation electron beam patterns. In nonoscillation welding, the welding speed, was varied; in oscillation welding just the oscillation pattern and the oscillation frequency were varied. After welding, X-ray inspection, metallography, fatigue crack growth tests and scanning electron microscopy were employed to characterize these specimens. From the results, the weld centerline solidification structure transforms from a longitudinal raft structure to an interlocked structure with increasing welding speed, and the fatigue crack growth rate increases slightly. The transverse oscillation pattern provides a lower fatigue crack growth rate than the longitudinal oscillation pattern. The higher oscillation frequency gives a lower fatigue crack growth resistence for the longitudinal oscillation pattern, but the opposite is the case for the transverse oscillation pattern. |
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