Abstract: A processing head is moved to a corner portion along a first side without decelerating while emitting a laser beam; emission of the laser beam is stopped after the processing head which is moving reaches the corner portion; the processing head is moved from the corner portion to a first predetermined position separated by a first predetermined distance along a second side while emitting the laser beam intermittently, and emission of the laser beam is stopped when the processing head reaches the first predetermined position; the processing head is accelerated from a position, which is on an extension line of the second side and before the corner portion, toward the corner portion; and emission of the laser beam is started when the processing head which is accelerating reaches the corner portion, and then the processing head is moved along the second side.

Abstract: A workpiece having a first plate-shaped part and a second plate-shaped part connected to the first plate-shaped part in a direction to cross the first plate-shaped part is cut with a laser beam. A cutting line across the first plate-shaped part and the second plate-shaped part is set. In the second plate-shaped part, a notch portion that opens to a tip end portion of the second plate-shaped part and is along the cutting line is formed by cutting with the laser beam so that a cutout piece that is cut out by forming the notch portion is divided into a tip end portion and a base portion. The first plate-shaped part is cut along the cutting line by irradiation with the laser beam from one direction.

Abstract: A composite material, which can be used as an alternative material to a prepreg, comprises a dry substrate fabric sheet, and at least thermosetting resin thin film is attached to one of the surface of the substrate fabric sheet. The substrate fabric sheet is thick and a multi-axial laminate structure formed by laying up a plurality of aligned fiber plies, and is not impregnated with resin previously.