Home / Standards / GB 12212-1990 GB 12212-1990 Technical drawings — Dimensions, proportions and simplified representation of weld symbols 技术制图 焊缝符号的尺寸、比例及简化表示法 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A