Forming limit investigation of friction stir welded sheets: influence of shoulder diameter and plunge depth

Ramulu, Perumalla Janaki and Narayanan, Ganesh R and Kailas, Satish V (2013) Forming limit investigation of friction stir welded sheets: influence of shoulder diameter and plunge depth. In: INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, 69 (9-12). pp. 2757-2772.

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Abstract

The main aim of the present work is to analyze the influence of shoulder diameter and plunge depth on the formability of friction stir welded sheets. The base material used for welding and forming was AA6061-T6. Formability evaluation was performed through limiting dome height tests. The forming limit curve, FLC (only in the stretching region), thickness distribution, and strain hardening exponent of the weld region were monitored during formability studies. It is found from the work that the forming limit of friction stir welded sheets is better than unwelded sheets. In general, with an increase in shoulder diameter and plunge depth, the forming limit is found to improve considerably. With a decrease in thickness gradient severity and an increase in strain hardening exponent (n) of the weld region, the forming limit is found to increase. The increase in n value of the weld region is believed to occur because of the reduction in dislocation density. The maximum thickness difference is higher in the retreating side, rather than in the advancing side, of the weld. This is due to the differential straining and hardness levels attained by both sides during friction stir welding.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Publisher:	SPRINGER LONDON LTD
Additional Information:	copyright for this article belongs to SPRINGER LONDON LTD,ENGLAND
Keywords:	Forming limit; Friction stir welding; Shoulder diameter; Plunge depth
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	18 Dec 2013 05:27
Last Modified:	18 Dec 2013 05:27
URI:	http://eprints.iisc.ac.in/id/eprint/47940

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