Abstract
The main objective of this study is to compare the mechanical strength of friction stir spot welded (FSSW) joints and adhesive bonded single lap ones. The present study aims to compare the morphology and strength of welded and adhesive bonded joints. The welded joints were done by friction stir spot welding and the adhesive bonded ones by the use of the adhesive Araldite 420 A/B. The produced joints were subjected to morphology and microstructure analyzes, microhardness tests, tensile-shear tests and local strain analyzes. The welded joints have higher strength than adhesive-bonded joints. However, this difference is insignificant, around 5%, which is covered by the standard deviation. The connection by FSSW proves to be an alternative to adhesive bonded joints, offering the same strength, but with the connection at isolated points, inducing local stress concentration.
Highlights
Friction stir welding (FSW) was invented in 1991 at The Welding Institute (TWI) of UK and, it is considerate to be the most significant development in the joining technology due to its energy efficiency, environment friendliness and versatility
Literature reports that is possible to improve the final strength of single lap joints by changing the adherends and adhesive strength [9,10] as well as the elastic modulus of the adhesive [11, 12] and/or adherend [13, 14], adherend and adhesive thickness [15, 16], overlap length [17, 18] and fillets at the overlap edges [19, 20]
But in an attempt to decrease the stress concentration, stepped joints have been found to exhibit the highest structural efficiency because significant joint load path eccentricities are eliminated when compared with simple single lap joints [27]
Summary
The stepped joint will be used to compare the mechanical performance of friction stir spot welds against adhesive joints, because, according to the authors' knowledge, this study is not yet reported in the literature. This study involves a series of adhesive single lap joints (SLJ) using adherends from an AA5083- H111 aluminium alloy plate, of 120×120×3 mm size, and an epoxy adhesive Araldite® 420 A/B.
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