Home / Standards / GB/T 39312-2020 GB/T 39312-2020 Active Welding procedure qualification test for copper and its alloys 铜及铜合金的焊接工艺评定试验 Standard Type GBT ICS 25.160.10 CCS J33 Status 现行 Issue Date 2020-11-19 Implementation 2021-06-01 Responsible Dept 国家标准委 Drafting Unit N/A