Abstract: The present invention relates to a scanner having a flexible probe which is an apparatus capable of being utilized for an inspection on a weld zone of a general ferrite material and a stainless material and allowing an inspection to be performed on a fitting weld zone where it is difficult for a general phased array ultrasonic testing (PAUT) probe to approach.

Abstract: Provided are a roll for roll forming and a roll forming method therefor, by which a strip of sheet material is continuously fed and passed between roll stands that are arranged continuously, and is sequentially formed so that the sectional shape of the sheet material becomes circular, and by welding both ends of the sheet material, a pipe is finally produced. In the method, pressure parts and non-pressure parts are selectively disposed on a convex roll or a concave roll and the frequency of pressuring by the convex roll and the concave roll is reduced or adjusted such that the work hardening of the roll formed material or produced pipe is lowered or made to be uniform. Accordingly, the material characteristic and reprocessing characteristic of the roll formed material or pipe are greatly improved.

Abstract: A yoke unit connects two shaft arranged at a predetermined angle. The yoke unit has a pair of yoke portions receiving an input shaft, a clamp for clamping the input shaft, a bush disposed around the clamp, and an insert inserted into a space between the yoke portions and coupled to the bush. When the shaft is received in the yoke portions, the bush is inserted into through holes of the yoke portions such that the bush is positioned on a recess of the input shaft. The clamp passes through the bush and is screwed to any one of through holes of the yoke portions. The bush prevents the input shaft from moving an axial direction. The insert prevents the yoke portions from deforming when the clamp is fastened and when an external impact is applied to the yoke portions. A friction between the yoke unit and the input shaft can be reduced by the bush and the abrasion of the bolt and the shaft can be reduced.