Research of Homogeneous High Nickel Ductile Iron Welding Electrode
Author of the article:XU Jinfeng;ZHANG Wenli;ZHAI Qiuya;QI Pengzhan
Author's Workplace：School of Materials Science and Engineering,Xi′an University of Technology,Xi′an 710048,China
Key Words：high-ni ductile welding electrode welding performance weld microstructure
Abstract：The welding effect of cast iron depends largely on the welding material.In this paper,a new homogeneous high nickel ductile iron electrode is developed.The welding technology characteristics of the electrode and the microstructure and properties of welded joint under cold welding conditions were researched.The comprehensively evaluating experiments show that:the electrode has good technical performance.The weld metal has typical cast iron microstructure which composed of austenite,graphite spheroid and intergranular carbides.The width of fusion zone is narrow and No eutectic ledeburite microstructure forms.The tensile strength of the joint reaches 399 MPa and the Brinell hardness is between 189 HB and 226 HB.The welding zone has good machining performance as well as color consistent with the base metal.Thus,the new welding material has the double advantages of nickel-based welding material and homogenous cast iron welding material,it has the better application prospect on cast iron welding and repair.
