Home / Standards / GB/T 14693-1993 GB/T 14693-1993 Abolished Nondestructive testing symbols for welds 焊缝无损检测符号 Standard Type GBT ICS 25.160.40 CCS H26 Status 废止 Issue Date 1993-11-09 Implementation 1994-07-01 Responsible Dept 国家标准委 Drafting Unit N/A