The Research And Development Of The Flux Cored Wire YD410NiMo For Welding Stainless Steel Turbine Blade

In China, There are rich hydropower resources, and the hydropower, which is an idealgreen clean energy, is clean, renewable, non-polluting and low operation cost. In China, thehydropower water has characteristics with large gap, flow speed, water sediment, whichmaking the hydraulic turbine in operation be affected by cavitation wear, erosion abrasionand wear of both the composite role. This has brought huge losses in hydropower industry.Hydraulic turbine, which is a core component of hydropower station. There is a trend thatCr13Ni5type martensitic stainless steel has being used for runner component in recentyears. The welding is an important method of repairing turbine, and the flux cored wire is agood welding consumable for repairing hydraulic turbine.In the article, the constituent of the flux power and the fill rate are confirmed through ahundred recipes comparative experiments firstly. Secondly, the comparative tests betweendeposited metal of flux-cored wire and base metal and deposited metal of other weldingconsumable are determined. The wear resistance of surfacing metal is assessed bymeasuring the weight loss of the sample through using the MLS-225type wet rubber wheelabrasive wear test machine. From results and the SEM photographs of abrasive wear test,the furrows and flaking pits of flux-cored wire weld metal is significantly less than the basemetal and other welding methods weld metal. Considering the experimental expenditure,R&D costs and experimental cycle, it is simulated that the turbine is suffered byconcentrated flow erosion in actual works. The water sand erosion testing machine ofBeijing University of technology is used to test the abrasion resistant ability of sample.After rushing eight hours erosion test, the scanning electron microscopy morphology ofdifferent specimens are not different, there are spalling pits in all of them and same wearperformance, thus each specimen erosion has the similar resistance again, it is noteworthythat controlling the layer temperature can improve the flux-cored wire deposited metalerosion abrasion and abrasive wear performance, but Heat treatment does not work. Whenthe layer temperature controlled during150-200℃, the deposited metal has better abrasivewear and erosion abrasion wear performance.In short, the YD410NiMo flux cored wire is a turbine blades surfacing flux cored wirefor Cr13Ni5type base material. Through contrast test of the erosion and abrasive wearresistance, it can be found that the erosion resistance relative wear rate of flux-cored wiredeposited metal can reach1.59times than the base material, and the abrasive wearresistance on the wear rate can reach2.3times than the base material. The performance ofweld metal of flux-cored wire is better than the base material and comparative experimentsusing other consumables. The flux-cored wire is ueser-friendly, especially suitable for theon-site welding for Cr13Ni5, and the flux-cored wire can also be used as the surfacingmaterial for Cr13Ni5turbine.