Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Evaluation of the Wear Mechanisms in Contact Tip in Flux Cored Arc Welding Process Through a Pin-on-Disc Test
Submission Author:
Marcelo Teodoro Assunção , MG
Co-Authors:
Marcelo Teodoro Assunção, Alexandre Bracarense
Presenter: Marcelo Teodoro Assunção
doi://10.26678/ABCM.COBEM2019.COB2019-1220
Abstract
In welding processes in which the wire is fed continuously, electrical current is transferred from the welding source to the wire electrode through a contact tip, commercially made of copper alloys. The contact tip also has the function of guiding the wire to the molten pool. During the process, the contact tip wears out rapidly, in extreme cases it must be replaced within hours. The present work aims to investigate the wear mechanisms shortening the contact tip´s life. Experiments were carried out using a pin-on-disc type tribometer. The pins were made of low carbon steel and the disc made of electrolytic copper. It was noted a relation between friction coefficient and test parameters. Higher sliding velocities and higher normal loads result in higher friction coefficient. It was observed continuous rising in friction coefficient due to adhesion between the two metals. Optical microscopy techniques and scanning electron microscopy were employed to analyze the wear tracks. It was shown adhered particles in both pin and disc surfaces.
Keywords
wear mechanisms, Contact Tip, Copper-Steel Sliding
