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Ultrasonic assisted GMAW (U-GMAW) method is a novel process,which combines the ultrasonic wave with gas metal arc welding to improve the process stability and weld quality.The U-GMA W system is developed and the ultrasonic wave is applied by means of acoustic radiation.The arc characteristics and metal transfer modes are studied in comparison with conventional GMA W process.The arc plasma is compressed and the arc length is shorter than that in conventional GMA W process after the ultrasonic is applied onto the arc.The parameter range of short-circuiting mode is extended and the range of unstable transfer is minimized.The changes in arc characteristics are responsible for changes in metal transfer modes.