GB/T 39280-2020钨极惰性气体保护电弧焊用非合金钢及细晶粒钢实心焊丝标准
英文:Rods, wires and deposits for tungsten inert gas welding of non alloy and fine grain steels GB/T 39280-2020介绍: 国家标准《钨极...
英文:Rods, wires and deposits for tungsten inert gas welding of non alloy and fine grain steels GB/T 39280-2020介绍: 国家标准《钨极...