GB/T25774 Welding Material Inspection, Part 1, adopt international standard ISO 15792-1 2000      Welding Material Testing Method, Part 1, nickel steel and nickel steel alloy weld metal test method, adding Ø6mm stick,  type 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, test basic material adding thickness of insolation is less than 3mm, it regulates position of making specimen, requirement about size of tensile and impact test specimen. part 2, specimen making and test with joint of single side and line welding and double sides and single line welding.