采用化学分析、宏观检验、金相分析、断口扫描等方法对螺杆开裂原因进行分析。结果表明，原材料表面的条痕和高频感应工艺的集肤效应是导致螺杆开裂的原因。
By chemical analysis, macroscopic examination ，metallographic analysis and fracture analysis, The results shows that the Crack of the stud is caused by the row material seams and the skin effect from the high-frequency induction.
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