With the rapid development of low alloy steel strength level,more problems caused by welding are exposed day by day.Recently,the efforts have been paid to improve or enchance the low toughness of heated affected zone ...With the rapid development of low alloy steel strength level,more problems caused by welding are exposed day by day.Recently,the efforts have been paid to improve or enchance the low toughness of heated affected zone and welded metal which can enchance the comprehensive mechanical properties that is the core scientific problems of its safe operation by researching crack initiation and crack propragation attracted a rapidly growing interest.This article focuses on the research status and progress of welding technology and joint microstructure and properties of advanced steel materials.The influence of shielding gas on the microstructure evolution of deposited metals,the effect heat input of welded joint performance,interpass temperature and alloy elements on welded joints microstructure and M-A constituent evolution and properties are reviewed in detail.And for the heat affected zone,the grain size and microstructure as well as the shape,size,and distribution of M-A constituent,have a significant impact on the impact toughness.This paper is an attempt to review the effect of different welding process parameters on welded metal and HAZ of HSLA steels.展开更多
To investigate the factors affecting the quality of solder joints which would be available for the practical production,an axisymmetric finite element model of the resistance spot welding process simulated by Sysweld ...To investigate the factors affecting the quality of solder joints which would be available for the practical production,an axisymmetric finite element model of the resistance spot welding process simulated by Sysweld finite element software was established for a DP980 steel plate with a thickness of 1 mm.By simulating the formation process of spot welding nuggets,the distribution characteristics of temperature field and stress field in the process of spot welding heating and cooling can be studied to determine the nugget diameter and shear strength index.The results showed that the shear force of the spot-welding joint was affected by the structure,and the nugget diameter was non-linear relationship to the shear performance.For the DP980 spot welding joint,the critical nugget diameter of the IF fracture mode to PF fracture mode was 4.695 mm,and the maximum value of nugget diameter and residual stress decreased to different degrees with the increase of welding pressure.展开更多
文摘With the rapid development of low alloy steel strength level,more problems caused by welding are exposed day by day.Recently,the efforts have been paid to improve or enchance the low toughness of heated affected zone and welded metal which can enchance the comprehensive mechanical properties that is the core scientific problems of its safe operation by researching crack initiation and crack propragation attracted a rapidly growing interest.This article focuses on the research status and progress of welding technology and joint microstructure and properties of advanced steel materials.The influence of shielding gas on the microstructure evolution of deposited metals,the effect heat input of welded joint performance,interpass temperature and alloy elements on welded joints microstructure and M-A constituent evolution and properties are reviewed in detail.And for the heat affected zone,the grain size and microstructure as well as the shape,size,and distribution of M-A constituent,have a significant impact on the impact toughness.This paper is an attempt to review the effect of different welding process parameters on welded metal and HAZ of HSLA steels.
基金the National Natural Science Foundation of China(Grant No.51505271)the Natural Science Fundation of Anhui Province Education Office(Grant No.KJ 2018A0063 and KJ 2019A0069)。
文摘To investigate the factors affecting the quality of solder joints which would be available for the practical production,an axisymmetric finite element model of the resistance spot welding process simulated by Sysweld finite element software was established for a DP980 steel plate with a thickness of 1 mm.By simulating the formation process of spot welding nuggets,the distribution characteristics of temperature field and stress field in the process of spot welding heating and cooling can be studied to determine the nugget diameter and shear strength index.The results showed that the shear force of the spot-welding joint was affected by the structure,and the nugget diameter was non-linear relationship to the shear performance.For the DP980 spot welding joint,the critical nugget diameter of the IF fracture mode to PF fracture mode was 4.695 mm,and the maximum value of nugget diameter and residual stress decreased to different degrees with the increase of welding pressure.
