Journal
SOLDAGEM & INSPECAO
Volume 17, Issue 1, Pages 26-31Publisher
ASSOC BRASIL SOLDAGEM
DOI: 10.1590/S0104-92242012000100005
Keywords
Friction spot welding; AZ31 magnesium alloy; Taguchi method
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Funding
- CNPq (National Council for Scientific and Technological Development)
- FAPESP (Sao Paulo Research Foundation), Brazil
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Friction spot welding (FSpW) is a solid state welding process suitable for producing spot-like joints, especially in lightweight materials, which are particularly interesting due to the weight saving potential. The plunging of an especially designed non-consumable and rotating tool creates a. connection between overlapped sheets through frictional heat and plastic deformation. Minimum material loss is observed, and therefore a fully consolidated joint with flat surface (no keyhole) is obtained. In the current study, the effect of FSpW parameters, such as rotational speed, plunge depth and dwell time, on lap shear strength of AZ31 magnesium alloy joints was investigated. The optimization of input process parameters was carried out through Taguchi approach of DOE. Analysis of variance was applied to determine the individual importance of each parameter Main effect plots were used to indicate the best levels for maximizing lap shear strength. The results show that tool plunge depth has the higher effect on the weld strength, followed by rotational speed and dwell time.
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