Method of using friction stir welding to repair weld defects and to help avoid weld defects in intersecting welds
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United States of America Patent
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May 15, 2001
Grant Date -
N/A
app pub date -
Mar 5, 1999
filing date -
Mar 6, 1998
priority date (Note) -
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Abstract
A method of using friction stir welding to repair weld defects and to help avoid weld defects in intersecting welds and crack-sensitive material, such as 2195 Al--Cu--Li. Intersecting fusion welds in 2195 Al--Cu--Li have shown a propensity to crack both during welding and during proof testing. These cracks have generally been associated with a particular metallurgical structure present in the fusion zone ofVPPA/SPA weldments. HYBRID Friction Stir Overwelding of the initial VPPA/SPA weld from the penetration side is shown to convert the cast microstructure of these VPPA/SPA weldments into a fine grained, dynamically recrystallized microstructure showing higher strength, ductility, toughness, and resistance to intersection weld cracking.
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