Research of submerged arc welding buildup technology of 12Cr2Mo1V steel boss using additional filing wire
The boss of the 12Cr2Mo1V steel hydrogenation reactor shell is usually welded by single-wire submerged arc welding,which has low manufacturing efficiency.The feasibility of welding the 12Cr2Mo1V boss body by using the welding method of additional filler wire submerged arc welding was studied.The research results show that the welding processability is good when the additional filler wire submerged arc welding is used for body cladding on 12Cr2Mo1V steel;the mechanical properties of its process qualification test fully meet the requirements of the base metal,especially the KV2 impact value of the-30℃Charpy notch impact test is≥54 J,and the results of the temper embrittlement resistance tendency evaluation test meet the requirements of vTr54+3ΔvTr 54≤0℃.Compared with single-wire submerged arc welding,boss submerged arc welded by two guns with six-wire additional filler wires can increase production efficiency by 200%to 250%.Under the premise of meeting the performance of vanadium-doped steel boss,this process research can greatly shorten the boss manufacturing cycle,save energy and reduce emissions,and provide a new manufacturing method for the development of advanced green manufacturing of hydrogenation reactors.
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