Evaluation of the influence of oxidation of cooper in the soldering process ultrasound in automotive industry components

ABSTRACT

The main objective of this work is to understand the influence of oxidation on copper wires and its impacts on materials welded through the ultrasonic process in automotive components. 42 (forty-two) copper samples were extracted and subdivided into 7 (seven) groups with 6 (six) samples each for the experiment, where the first group had samples without oxidation and the last group had samples that were aged in 360 days. These samples were welded through the ultrasonic process with parameters that ensured the minimum requirements for solderability, visual criteria and the complete union of the copper filaments in the joint. After that, the welded materials were submitted to welding validation by measuring the shear traction force to guarantee the minimum requirements demanded by the internal standard of the automotive sector. The samples without oxidation met the engineering parameters and resulted in the highest values of shear tensile strength. In the samples with the presence of oxidation, the increase in welding energy provided a reduction in the shear force of the 6 (six) groups, with 1 sample that was below the minimum parameter established for shear force.

Keywords
Ultrasonic welding; Automotive components; Parameters; Shear stress strength