A model was developed to simulate the temperature distribution and nugget formation during resistance spot welding （ RS1V） of zinc-coated steels. It employs a coupled thermal-electrical-mechanical analysis simulatin...A model was developed to simulate the temperature distribution and nugget formation during resistance spot welding （ RS1V） of zinc-coated steels. It employs a coupled thermal-electrical-mechanical analysis simulating the dynamic RSW process. Temperature-dependent thermal-electrical-mechanical material properties were considered including contact-resistance. The contact area was determined from a coupled thermal-mechanical analysis. A layer of transition elements was used to represent the change of contact area by killing or activating elements. The heat generation and temperature field were computed in a coupled thermal-electrical model. All these analyses were solved using the commercial finite element method （FEM） based on ANSYS code, and some advanced functions were used by writing a paragraph of codes by the authors. Compared with the results from only coupled thermal-electrical model in which contact area was uniform during the whole process, the result matches better to the experimental results.展开更多
This work examined the effect of plating variables on zinc coated low carbon steel substrates. The electrodeposition of steel substrates was carried out in zinc electrolyte bath. Time, voltage, distance from the anode...This work examined the effect of plating variables on zinc coated low carbon steel substrates. The electrodeposition of steel substrates was carried out in zinc electrolyte bath. Time, voltage, distance from the anode to the cathode and the immersion depth served as plating variables. The results showed that weight gained increases as the plating time increases for the constant depth of immersion while the weight gained per unit time by varying immersion depth is irregular. Also, the study demonstrated that sample plated for 20 minutes;20cm from the anode, 45cm depth of immersion at 0.8V exhibited the best plating properties with homogeneity of diffuse plating efficiency.展开更多
文摘A model was developed to simulate the temperature distribution and nugget formation during resistance spot welding （ RS1V） of zinc-coated steels. It employs a coupled thermal-electrical-mechanical analysis simulating the dynamic RSW process. Temperature-dependent thermal-electrical-mechanical material properties were considered including contact-resistance. The contact area was determined from a coupled thermal-mechanical analysis. A layer of transition elements was used to represent the change of contact area by killing or activating elements. The heat generation and temperature field were computed in a coupled thermal-electrical model. All these analyses were solved using the commercial finite element method （FEM） based on ANSYS code, and some advanced functions were used by writing a paragraph of codes by the authors. Compared with the results from only coupled thermal-electrical model in which contact area was uniform during the whole process, the result matches better to the experimental results.
文摘This work examined the effect of plating variables on zinc coated low carbon steel substrates. The electrodeposition of steel substrates was carried out in zinc electrolyte bath. Time, voltage, distance from the anode to the cathode and the immersion depth served as plating variables. The results showed that weight gained increases as the plating time increases for the constant depth of immersion while the weight gained per unit time by varying immersion depth is irregular. Also, the study demonstrated that sample plated for 20 minutes;20cm from the anode, 45cm depth of immersion at 0.8V exhibited the best plating properties with homogeneity of diffuse plating efficiency.
