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| Investigation and numerical simulation on weld bonding #br#
process for SPCC coldrolled steel |
| YI Jinquan，ZENG Kai，XING Baoying，WU Wanping，ZHAI Tingting |
(Faculty of Mechanical and Electrical Engineering， Kunming University of Science and
Technology， Kunming 650500， Yunnan， China) |
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Abstract In order to study the influence of the weld bonding process on the mechanical properties and the evolution of temperature field of the weldbonded joints，the orthogonal test of weld bonding and resistance spot welding was carried out for 1.5 mm thick SPCC coldrolled steel sheet. The optimum process parameters were obtained by using range and variance analysis. The two type joints were tested in the proper test machine to obtain the failure load of the joints. The mechanical properties of the spot welding and weldbonded joints were compared and analyzed. In order to investigate the evolution of temperature field for weldbonded joints，the weld bonding simulation models were established. The diameter of the nugget was measured by the Cscan image. The results show that the influence factors on the tensile load of the weldbonded joints are as follows：the welding current，the welding time and the electrode pressure. The maximum average failure loads of weldbonded joints and spot welding joints are 11 071.12 and 10 179.72 N，and the adhesive improves the shear strength of the joint. The volume of molten metal increases with the welding time extension，and the nugget expands elliptically along the radial and axial directions. The radial temperature is higher than the axial direction. Furthermore，the nugget diameter of simulation and Cscan image is 6.17 and 5.61 mm.
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