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对攀钢６０ｋｇ／ｍＵ７１Ｍｎ重轨闪光焊接头灰斑缺陷进行了宏观和微观断口分析，研究了工艺参数对灰斑缺陷的影响，提出了改善接头性能的措施
The macroscopic and microscopic fracture analysis on the gray spot defects of 60kg / mU71Mn heavy rail flash welded joints in Panzhihua Iron and Steel Co., Ltd. was conducted. The influence of technological parameters on the gray spot defects was studied, and the measures to improve the joint performance