What welding wire for F22 valve steel and 12Cr1MoV pipe welding?
F22 belongs to Cr2.5% Mo1% heat-resisting steel,12Cr1MoV belongs to the F11/P11 (Cr1% Mo0.5%) 2 kinds of heat-resistant steel, welding material should be used if the F22 welding material, welding wire GB ER62-B3 American Standard: ER90S-G/ER90S-B3
May I ask what your working status is?
The welding process is complex and needs to be evaluatedPreheat the whole or part of the weld before welding, guarantee the preheating temperature 250~300 degrees within the range of 150mm on both sides of weld, and the temperature between layers shall be within the control range of preheating temperature.GTAW (pure Ar gas protection): it is recommended to adopt TIG-R31 (including V) welding wire, diameter 2.5mm, current 100 ~ 140A.If there is a certain wall thickness, the pipe diameter is not very small, it is recommended to take GTAW+SMAW.SMAW: the welding rod adopts R337, and the specifications can be determined according to the actual situation.After welding, clean splash, heat up to 350~450 degrees, keep warm and cool after heat.12Cr1MoV best use of the corresponding components of heat-resistant steel electrode, such as R310, R312, R317, R316Fe, preheating 250~350 degrees before welding, welding tempering treatment 710~750 degrees.
