火電系統石家莊風機廠風機用鋼的焊接試驗研究

 石家莊風機廠 石家莊風機 石家莊市風機廠 石家莊風機維修 石家莊風機銷售

摘要
石家莊風機廠風機被廣泛應用在國民生產生活的各個行業,也是火力發電系統的重要組成部分。石家莊風機廠風機的焊接工藝和材料選擇直接影響著石家莊風機廠風機的使用壽命。為了提高石家莊風機廠風機的整體質量和使用壽命,對石家莊風機廠風機用鋼的焊接工藝進行研究具有重要意義和價值。
本文對火電系統用石家莊風機廠風機的各結構進行了焊接工藝試驗,石家莊風機廠風機葉片釆用氧乙炔火焰噴焊處理,主軸采用B鋼焊接,石家莊風機廠風機葉輪采用C鋼焊接。進行了碳當量計算,焊接工藝選擇,焊后對各接頭進行性能試驗及微觀組織分析,包括拉伸、彎曲、沖擊韌性、硬度、金相分析等試驗。同時對個別試件進行了 SEM斷口掃描,對噴焊試驗進行了孔隙率試驗。
試驗表明,經過優化的工藝參數得到的接頭性能良好,氧乙炔火焰噴焊處理可以很好的提高材料的表面硬度,并且與母材浸潤良好;通過對B鋼和C鋼的碳當量計算可得出其焊接性均較差,需要對焊接試件進行焊前預熱處理以及焊后熱處理,以得到性能更優的焊接接頭;不同熱輸入得到的接頭組織性能有一定差別,合理選用焊接工藝參數控制熱輸入的大小能夠得到性能較優的接頭組織。
Abstract
Blowers is widely used in every industry of national product life,is also an importantpart of thermal power systems. Welding technology and materials selection directly affectsthe service life of blowers. In order to improve the overall quality and the service life of theblowers, tiie research of welding technology of steel for bowers is of great significance andvalue.
This paper studied on welding process of steels for blowers in tiiermal powersystem,blowers blades using oxyacetylene flame spray welding processing, spindle using Bsteel welding, Blowers impeller using C steel welding.Processing flie carbon equivalentcalculation, welding process selection, after welding on the joint performance testing andmicrostructure analysis including tensile, bending, impact toughness, hardness,metallographic analysis experiment.At the same time,processing SEM fracture scanning ofindividual specimens,the porosity test for spray welding experiment.
The results of experiment showed that the optimized process parameters of jointperformance is good; the oxyacetylene flame spray welding process can well improve thematerials surface hardness,and good parent metal infiltration;The carbon equivalentcalculation of B steel and C steel could discern their weldability is bad,need to weldingpecimen for preheating before welding processing and heat treatment after welding, in orderto get better performance of welding joint; Joint organization performance achieved bydifferent heat input has a certain difference,controlling the size of the heat input by thereasonable selection of welding process parameters can get a better performance of jointorganization.