Rod should not have obvious camber, crack, burr, peeling or other defect affecting he further USES.
杆料不应有明显弯曲，裂缝、毛刺、起皮及影响使用的其他缺陷。
2
Aemission spectrometer, micro-hardometer, optical microscope and scanning electron microscope were used to analyze the reason of crack on connecting rod unit assembly for piston of car engine.
For the inner crack appearing often in round-rod rolling steels in the production, the influence to the crack from deformation extent and mechanical condition in the deformation region is discussed.