抄録
The observation of the welding arc and molten metal behavior is necessary in order to model the welding phenomenon. A tracer, which is made of zirconium oxide, is floated in order to visualize the molten metal behavior. The flow direction and speed of the molten metal can be quantitatively measured by tracking the locus of the tracer. Experiments are carried out under the following parameters; the kinds of shield gas and the sulfur content in the 304 stainless steel test piece. We have succeeded in visualization and measurement of the molten metal behavior in GTAW by use of the high-speed camera and the tracer.
