Home / Standards / GB/T 6417-1986 GB/T 6417-1986 Abolished Classification of imperfections in metallic fusion welds,with explanations 金属熔化焊焊缝缺陷分类及说明 Standard Type GBT ICS 25.160.40 CCS J33 Status 废止 Issue Date 1986-05-24 Implementation 1987-05-01 Responsible Dept 国家标准委 Drafting Unit N/A