PURPOSE: To thoroughly remove stuck material and assure reset time and prevent the formation of a secondary scale, by keeping the impact force of the pressurized water of descaling device at specific values, providing an interval necessary for recuperation of a material to be examined between said device and a flaw detector and providing an inert gas chamber over the overall length.
CONSTITUTION: A material 1 to be examined is scarfed by a hot scarfer 6, and is sent to a descaling device 8, where it is removed of stuck material by the pressurized water of ≥0.4kg/cm2 impact force to the material 1 from an injection header 9. Thence, it is sent to a flaw detector 7, and the interval L during this time is set at such an interval L at which the recuperation time necessary for eliminating the temp. unevenness of the material 1 caused by the injection of the pressurized water is secured. In this part, an inert gas chamber 10 is provided approximately over the overall length, whereby the formation of a secondary scale of the material 1 is prevented.
MORII HIROSHI
HIROSE ISAMU
NAKAI YASUHIDE
NISHIMOTO YOSHIROU
