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Material flow forming the shoulder flow zone using scroll shoulder tool during friction stir welding of thick section aluminum alloys

conference contribution
posted on 2010-01-01, 00:00 authored by D Yan, Guy Littlefair, Z Chen
Scroll shoulder tools are widely used and they do not need to be tilted during friction stir welding (FSW). However, the detailed material flow, which is important for proper scroll shoulder tool design and subsequently for forming the defect-free shoulder flow zone, has not been fully explained. In the present study, features of material flow in shoulder flow zone, during FSW of thick 6061 aluminium (Al) plates using a scroll shoulder tool were investigated. It was observed that there is a simple layer-to-layer banded structure which appears in the bottom portion of shoulder flow zone, but disappears in the top portion of this weld zone. When the scroll shoulder tool is plunged into the workpiece to a determined depth, the workpiece material is extruded by the tool pin, and pushed up into the scroll groove beneath the shoulder forming the pick-up material. During the forward movement of the tool, the central portion of pick-up material was driven downward by the root portion of pin and then it detaches from the tip portion of pin in a layer-to-layer manner to form the weld.

History

Event

Minerals, Metals and Materials Society. Annual Meeting and Exhibition (139th : 2010 : Seattle, Wash.)

Pagination

323 - 329

Publisher

The Minerals, Metals & Materials Society (TMS)

Location

Seattle, Wash.

Place of publication

[United States]

Start date

2010-02-14

End date

2010-02-18

ISBN-13

9780873397513

ISBN-10

0873397517

Language

eng

Notes

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Publication classification

E1.1 Full written paper - refereed

Title of proceedings

Global innovations in manufacturing of aerospace materials : the 11th MPMD Global Innovations Symposium; TMS 139th Annual Meeting and Exhibition

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