The result has shown that the fracture was caused by such surface defects as fold crack in section a at connecting rod small end.
结果表明，断裂由连杆小头A截面的表面缺陷(折叠裂纹等)引起。
Air-cooled equipment: it is used for connecting rod forging cooling line. It can make the connecting rods in the exact requirements of surface hardness.
风冷设备：它是用于连杆等锻件的在线冷却用。它能使连杆表面硬度达到精确的要求。
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