Experimental Research on Tensile-shear Behavior of Spot-welded Lap Joints of Ultra-high Strength Steel
The ultra-high strength quenched 22MnB5 steel is researched in this paper, the intermediate frequency inverter & electric servo welding gun system is used to weld the sheets, experiments included of tensile-shear with synchronous electrical testing, microstructure of the material and fractures analysis and the Vickers-Hardness testing.The results point out that the maximum hardness is located at weld nugget, and the minimum hardness is appeared in heat affected zone (HAZ).Fracture is formed under the combined effects of shear stress and normal stress, the shear stress contributes to interfacial fracture, and leads to rupture.Non-uniformity of the microstructure caused by spot welding, changed the property of the material in nugget, stress-strain relationship of this area is nonlinear.The results also show that the conventional weld size guidance of 4√t is not sufficient to produce nugget pullout failure mode for 22MnB5 UHSS spot welds.
Ultra-high strength steel (UHSS) Spot-welded Mechanical properties
Yuehua Liu Huiping Yu Weiwei Wang Xiaoyang Li Shujun Chen
College of Mechanical Engineering and Applied Electronics Technology,Beijing University of Technology,Beijing 100124,China
国际会议
上海
英文
1720-1724
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）