A Case Study for the Welding of Dissimilar EN AW 6082 and EN AW 5083 Aluminum Alloys by Friction Stir Welding

Sefika Kasman,Haydar Kahraman,Anıl Emiralioğlu,Fatih Kahraman

doi:10.3390/met7010006

Abstract

The aim of this study is to investigate the effect of keeping constant the tool rotational speed to the welding speed ratio (υ ratio) on the mechanical properties of the dissimilar friction stir welding of EN AW6082-T6 and EN AW5083-H111. Two different pins shaped as triangular and pentagonal were associated with the constant υ ratio. From the tensile test results, it was found that the υ ratio does not create an evident change in the weld joint strength. The small cavity- and tunnel-type defects were observed at the nugget zone and located on the advancing side of the pin. These defects caused a decrease in the strength and elongation of the weld joint. The most important inference obtained from the experimental results is that if the υ ratio is kept constant, the weld joint strength for each weld does not correspond to a constant value.

Highlights

It is well known that aluminum alloys have inherent and versatility properties such as resistance to corrosion, good formability, a good strength to weight ratio, low density and electrical and thermal conductivity
The present study focused on the effect of fixing the ratio of the tool rotational speed to the welding speed “υ” on the microstructure and mechanical properties of dissimilar FS welding of EN AW6082 to EN AW5083
The pin shape shows the predominant effect on the nugget zone (NZ) shape compared to the υ ratio

Summary

Introduction

It is well known that aluminum alloys have inherent and versatility properties such as resistance to corrosion, good formability, a good strength to weight ratio, low density and electrical and thermal conductivity These properties make it a high-demand material compared to the steel alloys in industrial application, in the automotive, shipbuilding, packaging, construction and architecture fields, etc. The welding of aluminum alloys by fusion welding techniques produces some defects such as pores, loss of some elements, hot cracking, stress corrosion cracking, and mismatch between the filler alloy and the workpiece material in dissimilar welding, causing the loss of strength of the weld joint [1]. Aluminum-magnesium alloys are non-heat-treatable alloys which provide good mechanical properties, corrosion resistance, and good workability and weldability These excellent properties make it an attractive material in a wide range of construction and structural applications in the automotive and shipbuilding industries.

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