MECHANICAL PROPERTIES OF AA5754 SHEETS WELDED BY COLD METAL TRANSFER METHOD

Year 2017, Volume: 12 Issue: 4, 170 - 177, 20.10.2017

Hülya Durmuş , Nilay Çömez

Abstract

Cold
Metal Transfer (CMT) is a modified gas metal arc welding method. This method is
different from conventional gas metal arc welding methods. In this process the
heat input and the formation of spatter are reduced with the control of the
wire movement and arc. So, CMT welding became indispensable in the welding of
thin sheets. The importance of lightweight structures in vehicles is increasing
day by day, so the use of thin sheet aluminum alloys such as AA5754 is becoming
increasingly widespread. In present study, 2mm thick AA5754 sheets were joined
with cold metal transfer welding using ER5356 (AlMg5) filler wire. The effect
of heat input on the weld quality was investigated. Microstructural
examinations were executed by optical microscope and SEM. Mechanical properties
of joints were determined by tensile and bending tests. It was found that
increasing heat input did not have a significant effect on tensile strength of
AA5754-AA5754 joints, while it corrupted the bending strength.   

Keywords

AA5754, ER5356, Cold Metal Transfer Welding, SEM, Welding

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