Pin breakage during friction stir welding of Al alloy
- Miyake M. ,
- Sato Y.S. and
- Kokawa H.
- Miyake M. ,
- Sato Y.S. and
- Kokawa H.
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Description
The influence of weld length on pin breakage during friction stir welding (FSW) of aluminium alloy was investigated. Tool geometry, microstructure, pin diameter and the occurrence of cracking were studied during welding. Welded joints were made in 7075-T6 Al Zn Mg alloy (Al, 1.2-2.0%Cu, 2.1-2.9%Mg, 0.17-0.28%Cr, 5.1-6.1%Zn, 5 mm thickness) using a FSW tool of JIS SKD61 tool steel (0.35-0.42%C, 0.8-1.2%Si, 0.25-0.5%Mn, 4.8-5.5%Cr, 1.0-1.5%Mo, 0.8-1.15%V). FSW was conducted up to a 10 m length by repeating 200 mm travel. A linear relationship was obtained between the length of crack at the root of the pin and weld length over a weld length of 3 m. The correlation between the number of striations observed on the crack surface of the tool and the number of FSW operations is examined. The relationship found between pin breakage and fatigue crack propagation at the start of tool travel is discussed.
8th International Symposium, 18-20 May 2010, Session 10A: Tool Designs, Paper 04
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