Home / Standards / GBT 29712-2013 GBT 29712-2013 Non-destructive testing of welds — Ultrasonic testing — Acceptance levels 焊缝无损检测 超声检测 验收等级 Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A