Home / Standards / GB/T 12212-2012 GB/T 12212-2012 Active Technical drawings - Dimensions,proportions and simplified representation for welding symbols 技术制图 焊缝符号的尺寸、比例及简化表示法 Standard Type GBT ICS 01.100 CCS J04 Status 现行 Issue Date 2012-05-11 Implementation 2012-12-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委