AMBROSIO, Danilo; WAGNER, Vincent; DESSEIN, Gilles; PARIS, Jean-Yves; JLAIEL, Khouloud; CAHUC, Olivier

doi:10.1007/s00170-021-07754-4

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International Journal of Advanced Manufacturing Technology. 2021-07-31, vol. 117, n° 1-2, p. 635-652

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The quality of friction stir welding joints is intimately related to the correct mixing of the stirred material. The material flow is strongly dependent on the plastic behavior of the welded alloy. For this reason, the friction stir weldability depends on the structure, microstructure, and chemical composition of the base material. In this work, in-plane forces and acoustic emission signals were monitored while welding two heat-treatable aluminum alloys. The force evolutions suggested possible continuous and intermittent material flow during friction stir welding depending on the welding parameters. The differences observed in the in-plane forces were corroborated by acoustic emission, confirming the modification in the material flow phenomenology. Therefore, differences observed in aluminum alloys’ friction stir weldability are due to the plastic behavior at high temperature and medium-high strain rate. The higher the deformability of the aluminum alloys, the wider the weldability window in friction stir welding because of continuous material flow in an extended range of process parameters.< Réduire

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Friction stir welding

Forces

Acoustic emission

Plastic behavior

Material flow

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Plastic behavior-dependent weldability of heat-treatable aluminum alloys in friction stir welding

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