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1 2016

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Improving crack resistivity in Al alloy pressure vessels by FSW

Lenin A. W. A., Nagaraj P., Lincy G.

Journal of Achievements in Materials and Manufacturing Engineering

2016

Vol. 79, nr 2

54--58

Purpose: Fuel or oil transmission pipelines are made with light metal alloys to prevent corrosion and to provide a better safety record. This is achieved by the combination of perfect design, selection of materials and functioning practices. However, like any engineering structure, these lines also fail occasionally. Major cases of such failure it induces due to external interference or corrosion or due to manufacturing defects; so such of defects if they were detected before failure and that can be treated to avoid failure or the life time can be improved. Design/methodology/approach: In this study an aluminum alloy sample with micro crack was treated with FSW process with ZN powder. And studies were carried out against both treated and untreated samples with cracks. Findings: From the studies it is clear that FSW treatment over surfaces will reduces the crack initiation in light metal alloy structures. The process can be done before or after installation. Research limitations/implications: The results were recorded and suggested FSW as a best process for crack treatment in Al alloys. Especially in pressure lines or pressure vessels. Originality/value: Friction stir welding (FSW) is a solid-state metal joining process. This is energy efficient, ecofriendly, and versatile light metal joining technique. In particular, high-strength aerospace aluminum alloys can be welded by using this technique. This will produces high harden joints in light metals as just like conventional arc welding techniques. It is considered as the most significant research development in light metal joining.