Cold cut saw: that is when the metal is rotated at high speed, the circular saw blade is cut off quickly, and the cutting surface is smooth and smooth.

Hot cut saw: commonly known as chopping saw, also called friction saw. High speed cut with high temperature, spark, cut off the end of the purple, multi burr.

Sawing method：

Cold cut saw: high speed saw blade rotates slowly, milling the welded pipe, so no burr and no noise can be achieved. Sawing process produces very little heat, saw blade has little pressure on the steel tube, and will not cause deformation of the pipe wall.

Hot sawing: the ordinary computer flying saw rotates at high speed for the tungsten steel saw blade, and the contact pipe generates heat to break it. High burning marks are visible on the surface. A large amount of heat is generated, and the saw blade has great pressure on the steel tube, resulting in deformation of the pipe wall and causing quality defects.