Hainan Steel tells you: the convergence of steel construction material shall conform to the requirements of

First, the choice of welding electrodes craft shall comply with existing standards, "steel rod" or "low-alloy steel welding rod" requirement. Selected wire type corresponding to the metal strength to adapt. For heavy duty crane girder, truss crane or similar structure, should use low-hydrogen electrodes.
Second, the choice of automatic welding or semi-automatic welding wire and flux, with the main metal strength should adapt. Wire should be consistent with the current standard, "welding wire" requirement.
Third, the current standard of ordinary bolts can be used on the 3rd Steel "ordinary carbon structure steel Skills conditions" in the provisions made.
Fourth, the high-strength bolts shall comply with existing standards, "steel structure with high strength large hexagon head bolts, hexagon nuts, washers, type size and skill condition" or "steel construction with torsional shear type high convergence condition Vice Type size and skills" provisions.
Fifth, the rivet should use existing standards ML2 "ordinary hot-rolled carbon steel round skills Heading conditions" set forth or No. ML3 steel. Hainan Steel