PURPOSE:To obtain the titled welder, which can execute uniform excellent welding machining at all times, by detecting the temperature of the outer circumferential surface of a bracing roller and controlling a transfer rate of a sheet- shaped material to be macined in response to the detecting output. CONSTITUTION:The temperature of the outer circumferential surface of the bracing roller 25 is detected by a thermistor 33, and the speed of revolution of motors 15, 8 is controlled through motor-speed control circuits 34, 38 in response to the detecting output of the thermistor. The transfer rate of the material to be machined is slowed down when the temperatures of the outer surface of the bracing roller 25 and a surface to be machined 13 are low, and the transfer rate is accelerated in response to their increase when they are high.
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