GB国家标准 GB/T 8110-2020 熔化极气体保护电弧焊用非合金钢及细晶粒钢实心焊丝 GB/T 8110-2020.Wire electrodes and weld deposits for gas shielded metal arc welding of non alloy and... 07月16日GB/T 8110 阅读全文