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冷切鋸：即常溫下金屬被高速旋轉(zhuǎn)的圓鋸片快速切斷，切斷端面平整，光潔如鏡。
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.
熱切鋸：俗稱砍鋸，也叫摩擦鋸。高速切斷伴有高溫、火花，切斷端面呈紫色，多飛邊毛刺。
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.
鋸切方式
Sawing method
冷切鋸：高速鋼鋸片慢旋轉(zhuǎn)，銑斷焊管，所以可以做到無毛刺和無噪音。鋸切過程產(chǎn)生很少的熱量，鋸片對鋼管有很小的壓力，不會造成管壁管口變形。
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.
熱切鋸：普通電腦飛鋸為鎢鋼鋸片高速旋轉(zhuǎn)，接觸焊管產(chǎn)生熱量使其斷開，實為燒斷。表面可見高燃痕跡。產(chǎn)生很大的熱量，鋸片對鋼管產(chǎn)生很大的壓力，造成管壁管口變形造成質(zhì)量缺陷 。
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.