The　alternating　current　(AC)　gas　tungsten　arc　welding-gas　metal　arc　welding　(GTAW-GMAW)　hybrid　indirect　arc　process　is　characterized　by　the　arc　configuration　in　which　the　AC　flows　between　the　filling　wire　and　tungsten　electrode　but　not　the　base　metal.　In　this　study,　the　effects　of　the　square　AC　waveform　parameters　and　the　relative　position　of　the　wire　and　tungsten　electrodes　on　the　arc　behavior　and　droplet　dynamics　were　studied.　Observations　showed　that　the　arc　configuration　between　the　tungsten　electrode　and　wire　on　the　wire-negative　stage　was　in　a　curved　cylinder　shape,　accompanied　by　cathode　spot　climbing　along　the　droplet　and　wire　surface,　and　the　droplet　swings　toward　the　tungsten　side.　When　the　polarity　of　the　wire　was　changed　from　cathode　to　anode,　the　arc　configuration　changed　into　a　triangle　profile.　The　droplet　began　to　swing　toward　the　wire　side.　The　transport　direction　of　the　droplet　was　along　the　line　connecting　the　tungsten　electrode　tip　and　wire　tip.　The　results　showed　the　effects　of　current　frequency　on　the　maximum　climbing　height　of　cathode　spot.　The　cathode　spot　movement　was　also　scaled,　which　is　related　to　spread　of　current　into　the　droplet.