This part of GB/I34370 specifies the ultrasonic guided wave testing and result evaluation methods for amusement facilities. This part is applicable to metal plates (including channel steel and square beams) with a wall thickness of 4 mm to 80 mm in amusement facilities, steel pipes with a diameter of 16 mm to 2000 mm, and steel pipes with a wall thickness of 2 mm to 80 mm and a diameter of 12 mm. - 185 mm steel wire strength and stay cables, 16 mm in diameter -