通过对不同基体的灰口铸铁的钨极氩弧重熔处理,详细研究了重熔层裂纹的形式和形成原因,从工艺参数、基体组织和预热温度三方面探讨了裂纹的防止措施。 Based on the TIG reflow treatment of the gray cast iron with different substrates, the forms and causes of the cracks in the remelted layer were studied in detail. The measures to prevent the cracks were discussed from three aspects: process parameters, matrix structure and preheating temperature.