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The thermal image of weld pool and its adjacent area contains many useful information related to the weld quality. Occurrence of weld defects such as porosity, slag inclusion, or crack or during welding causes the change of thermal distribution adjacent area where the weld defects occur. The accidental root gap change makes the different temperature distribution also. In this research the various thermal images of flux cored arc welding were obtained by use of a high-speed infrared camera. The thermal image of weld area 2cm behind the arc shows thermal image of bead and the corresponding signals of welding current and voltage. The 4 kinds of specimens, V-groove specimens without root gap, with changing root gap, filled partly with slag pieces and coated partly with grease at intervals of 30 mm were used. The thermal images for each case were analyzed by the specific evaluation values, Wt and At, extracted from the thermal image. Wt value indicates the width over the specific thermal intensity and At indicates the area which means the summation of the thermal intensity over the specific value. The analysis result showed a meaningful change of these values when any weld defects occurred. The change of At values was more prominent than the change of Wt value. It means the weld quality can be monitored by the change of At values from the thermal image of weld area during welding.

A Study on the Estimation of Weld Quality Using the Thermal Images During Arc Welding