MONITORING METHOD OF CUT PART DURING UNDERWATER PLASMA CUTTING

摘要

PURPOSE:To monitor thoroughly and surely a cut part with an underwater illumination device and an industrial television camera by running clean water near the cut part in a low laminar flow state, thereby expelling the water contaminated by the fume generated during cutting and making the water clear. CONSTITUTION:A structural material 2 to be cut in a pool 1 is plasma-cut by a torch 3. A valve 6a of a cleaning up device 6 is opened and a pump 7 is run to suck the contaminated water generated in the cut part through a suction port 8 into a piping 9. The contaminated water is cleaned up by a filter 10 and is then forcibly fed by the pump 7 into a piping 9', so that it is discharged from a discharging port 11. The gentle clean water flow heading from the port 11 toward the port 8 is thus formed by which the fume generated during cutting is flushed away and the cut part as well as the part between an illumination device 4 and a television camera 5 are locally cleaned up and are made transparent. The sufficient and sure monitoring of the cut part is thus made possible and the accuracy and efficiency in the cutting are improved.