D. DeLapp, G. E. Cook, Welding Automation Laboratory Vanderbilt University, Nashville, TN; A. M. Strauss, Vanderbilt University, Nashville, TN; W. E. Hofmeister, Vanderbilt University Welding Automation Laboratory, Nashville, TN

Summary: Autogenous GTA welds were performed on 3mm carbon steel plates. A macro camera and high speed frame grabber camera system was employed to make direct observations and measurements of weld pool solidification and surface flows. Flows tended to be rotational with significant velocity fluctuations.