Research on submerged arc welding technology of N08810 alloy for cold hydrogenation heat exchanger
This paper analyzed the base metal properties,welding difficulties and welding properties of N08810 alloy.Experimental research was carried out on the wire sending system transformation of submerged arc welding equipment,groove form determination,welding material selection,welding parameters determination and stabilizing heat treatment process parameters determination.Specimen welding,nondestructive testing and mechanical properties testing were completed.Penetration testing and radiation testing results met the requirements of NB/T 47013-2015.The test results of joint tensile strength,hardness,bending performance,intergranular corrosion test and chemical composition met the test requirements of equipment design.The results showed that the ERNiCr-3/Marathon 444 combined welding consumables,using the submerged arc welding process specifications and heat treatment specifications proposed in this article to weld N08810 alloy could achieve satisfactory joint performance.The bending test of ERNiCrMo-3/OK Flux 10.90 combination produced microcracks without exceeding the standard,and the joint corrosion rate of intergranular corrosion test was higher than that of ERNiCr-3/Marathon 444 combination.However,its various test indicators met the standards and design regulations,it could be used in high-temperature equipment without intergranular corrosion requirements.
万方数据
维普
