Study On Welding Process Of Steels For Blower In Thermal Power Systems

Blowers is widely used in every industry of national product life, is also an important part of thermal power systems. Welding technology and materials selection directly affects the service life of blowers. In order to improve the overall quality and the service life of the blowers, the research of welding technology of steel for bowers is of great significance and value.This paper studied on welding process of steels for blowers in thermal power system,blowers blades using oxyacetylene flame spray welding processing, spindle using B steel welding, Blowers impeller using C steel welding.Processing the carbon equivalent calculation, welding process selection, after welding on the joint performance testing and microstructure analysis including tensile, bending, impact toughness, hardness, metallographic analysis experiment.At the same time,processing SEM fracture scanning of individual specimens,the porosity test for spray welding experiment.The results of experiment showed that the optimized process parameters of joint performance is good; the oxyacetylene flame spray welding process can well improve the materials surface hardness, and good parent metal infiltration;The carbon equivalent calculation of B steel and C steel could discern their weldability is bad,need to welding specimen for preheating before welding processing and heat treatment after welding, in order to get better performance of welding joint; Joint organization performance achieved by different heat input has a certain difference, controlling the size of the heat input by the reasonable selection of welding process parameters can get a better performance of joint organization.