The paper studied the effect of Ni-Fe-C filler materials on the η phase formation during TIG welding of WC-30Co and 45 steel. η phase’s morphology and forming condition were discussed using BEI method. The properti...The paper studied the effect of Ni-Fe-C filler materials on the η phase formation during TIG welding of WC-30Co and 45 steel. η phase’s morphology and forming condition were discussed using BEI method. The properties of the weld joints were also measured using microhardness measurement and four-point bending measurement. The results show that the weld joints of WC-30Co/45 steel can be obtained by TIG welding using different Ni-Fe-C materials as filler materials, and η phase formed in the joints is M 6C, M 12 C type carbides. The poor carbon content of the W-Co-C system resulted from the C diffusion and the high ingredient Fe are the two vital factors inducing to η phase formation. It can be restricted by the addition of C element into Ni-Fe material. When carbon content is 0.01% in filler material, bend strength σ bb of weld joint is 908 MPa. However, when carbon content increases to 0.41% in filler material, bend strength σ bb is 1 260 MPa.展开更多
Petri net (PN) theory model was adopted for complexity in welding flexible manufacturing system (WFMS). A scheduling arithmetic was devised to optimize the process of controlling system. With this scheduling way, mode...Petri net (PN) theory model was adopted for complexity in welding flexible manufacturing system (WFMS). A scheduling arithmetic was devised to optimize the process of controlling system. With this scheduling way, model simulation experiment was designed to validate the model. And a sort of controlling software was designed on local net. Besides, a special welding experiment had been designed to check the controlling way. Results show the controlling process rightly and feasibly.展开更多
基金Fund from Bureau of Science and Technol-ogy of Dalian City in China( No.2 0 0 114 5 )
文摘The paper studied the effect of Ni-Fe-C filler materials on the η phase formation during TIG welding of WC-30Co and 45 steel. η phase’s morphology and forming condition were discussed using BEI method. The properties of the weld joints were also measured using microhardness measurement and four-point bending measurement. The results show that the weld joints of WC-30Co/45 steel can be obtained by TIG welding using different Ni-Fe-C materials as filler materials, and η phase formed in the joints is M 6C, M 12 C type carbides. The poor carbon content of the W-Co-C system resulted from the C diffusion and the high ingredient Fe are the two vital factors inducing to η phase formation. It can be restricted by the addition of C element into Ni-Fe material. When carbon content is 0.01% in filler material, bend strength σ bb of weld joint is 908 MPa. However, when carbon content increases to 0.41% in filler material, bend strength σ bb is 1 260 MPa.
基金The National Natural Science Foundation of Chia(No5057144)
文摘Petri net (PN) theory model was adopted for complexity in welding flexible manufacturing system (WFMS). A scheduling arithmetic was devised to optimize the process of controlling system. With this scheduling way, model simulation experiment was designed to validate the model. And a sort of controlling software was designed on local net. Besides, a special welding experiment had been designed to check the controlling way. Results show the controlling process rightly and feasibly.
