Quick pipe wrench is a special tool used to twist the cylinder. It can give the longitudinal torque of the pipe body. It is one of the common tools used by plumbers. Pipe clamp is made of high quality carbon - bonded steel according to ministry standard GB8406-87. The clamping surface is composed of a movable clamping surface blade tooth and a fixed clamping surface blade tooth. The two parts are connected by an adjusting nut, and there are tooth marks on the clamping surface of the two clamping surfaces. The part of the reverse extension cord fixing the clamp face is the handle of the pipe clamp. The movable clamp face can not only move longitudinally with the groove finding on the handle, but also has a small transverse range of motion. When clamping the pipe fitting with the pliers, the two clamping faces of the pliers have a small Angle.

There is both radial pressure and tangential torsion when the pipe clamp ACTS on the object. Therefore, the marks formed on the object by the pipe clamp include the imprint marks formed on the clamping surface and the scratch marks formed on the object by the tooth marks of the pipe clamp. When the maximum force is reached, the imprinting mark formed on the object by the tooth groove tip of the movable clamp surface and the fixed clamp surface is the main mark formed on the object by the pipe clamp. It can reflect the shape, relief, notch and other characteristics of the tooth groove tip, and the imprinting mark formed is stable and obvious.

In a word, because of the characteristics of torsion failure, there are obvious clamping marks. Secondly, the griping marks can reflect the characteristics of directional tooth marks, and the corresponding surfaces on both sides are in opposite directions. Thirdly, there are scratch marks on the griping marks. Fourth, when it is used for prying and pressing, there is an obvious scratch mark on the object that reflects the end features of tooth marks; Fifth, the imprint mark formed on the object is the main mark formed by the pipe clamp.