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The optimal parametric combination attained for drilling quality holes is speed = 4000 rpm, feed rate = 1.5 (mm/min), amplitude = 20 (µm), and frequency = 23 (kHz). The validation tests were also conducted to confirm the quality of drilled holes at the optimized process parameters.Real-time electric signal, matter transfer mode and welding pool behavior were obtained to investigate the effect of wires' filling rate on arc stability and joints' appearance during underwater wet flux-cored arc welding (FCAW). The electric signal results sho
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