Welding Points of Q355GNH steel

Pay attention to the following points when welding Q355GNH weathering steel:
1.Select the appropriate welding material and welding process. Q355GNH steel contains certain alloying elements such as copper, chromium, nickel, etc., and welding materials that also contain these alloying elements should be selected during welding, and the welding process parameters of Q355GNH steel should be adjusted according to specific conditions .

2.Surface treatment. Before welding, the surface of Q355GNH steel should be treated to remove rust, oil and other impurities to ensure the welding quality.

3.Control the temperature. The welding temperature of Q355GNH steel should not be too high. Too high temperature will easily cause volatilization of alloy elements and cracks in the heat-affected zone. At the same time, it is necessary to control the pre-execution and cooling rate during the welding process of Q355GNH steel to ensure the quality of the weld.

4.Strengthen protection. The welding of Q355GNH steel should strengthen protection measures to avoid oxidation and pollution, and maintain a good welding environment.

5. Uniform welding. The welding of Q355GNH steel should be as even as possible and completed at one time, so as to avoid the temperature of the welding point being too high or too low, resulting in a decline in welding quality.

The above points for attention can effectively improve the welding quality and weld strength of Q355GNH weathering steel.