Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Analysis of the effect of spot welding current on the mechanical behavior and failure modes of automotive steel sheets
Submission Author:
Tiago Colombo , SP
Co-Authors:
Fábio do Monte Sena, José Faria, Alfredo Faria, Tiago Colombo
Presenter: Tiago Colombo
doi://10.26678/ABCM.COBEM2017.COB17-2656
Abstract
The present paper aims to study the influence of the weld current on the mechanical performance of low-C Al killed drawing quality (AKDQ) steel samples welded through Resistance Spot Welding (RSW). The samples were subjected to quasi-static tensile-shear tests and results were used to assess the load-bearing capacity and energy absorption for different weld current conditions. Additionally, nugget size, indentation depth and hardness parameters were also assessed for all samples. Results indicate that for the evaluated weld currents there is a clear optimum process window for automotive applications, ranging from 12kA to 16kA. Transition in failure mode was observed at 10kA, at which the predominant mode becomes pullout, promoting high energy absorption and mechanical strength. Moreover, for weld currents higher than 17kA a considerable decrease in mechanical performance was observed
Keywords
Resistance Spot Welding, Al-Killed Drawing Quality steels, automotive manufacturing
