GB/T 40800-2021铸钢件焊接工艺评定规范标准
英文:Specification and qualification of welding procedures for production welding of steel castings GB/T 40800-2021介绍: 国家标...
英文:Specification and qualification of welding procedures for production welding of steel castings GB/T 40800-2021介绍: 国家标...