Material flow forming the shoulder flow zone using scroll shoulder tool during friction stir welding of thick section aluminum alloys
Yan, David, Littlefair, Guy and Chen, Zhan 2010, Material flow forming the shoulder flow zone using scroll shoulder tool during friction stir welding of thick section aluminum alloys, in Global innovations in manufacturing of aerospace materials : the 11th MPMD Global Innovations Symposium; TMS 139th Annual Meeting and Exhibition, The Minerals, Metals & Materials Society (TMS), [United States], pp. 323-329.
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Material flow forming the shoulder flow zone using scroll shoulder tool during friction stir welding of thick section aluminum alloys
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.
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ISBN
9780873397513 0873397517
Language
eng
Field of Research
091006 Manufacturing Processes and Technologies (excl Textiles)
Socio Economic Objective
861299 Fabricated Metal Products not elsewhere classified
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