The article presents experimental tests aimed to compare welding conditions and technological properties of butt joint welding using low-energy gas-shielded metal arc welding variants such as MAG Standard, MAG Puls, TwinPuls, SpeedPuls, SpeedUp, SpeedArc, SpeedRoot and SpeedCold. The article also presents a comparison of welding efficiency of these processes and the effect of power source dynamic characteristics on the geometry and macrostructure of welds.