WELDED STRUCTURAL MEMBER HAVING EXCELLENT STRESS CORROSION RACKING RESISTANCE, AND METHOD FOR MANUFACTURING SAME
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United States of America Patent
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Jul 25, 2024
app pub date -
Feb 21, 2024
filing date -
Oct 9, 2019
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Abstract
A production method of producing a welded structural member with excellent stress corrosion cracking resistance that includes a first artificial aging treatment step of maintaining a 7000-series aluminum alloy material at a temperature of 90 to 110° C. for 1 to 5 hours, a second artificial aging treatment step of maintaining the 7000-series aluminum alloy material subjected to the first artificial aging treatment step at a temperature of 145 to 160° C. for 4 to 12 hours; a welding step of welding the 7000-series aluminum alloy material subjected to the second artificial aging treatment step with another aluminum alloy material to form a welded structure; and a heat treatment step of heat-treating the welded structure at a temperature of 165 to 195° C. for 10 to 60 minutes. The material includes Zn, Mg, Zr, Ti, Cu, Mn, Cr, and Al, and is formed of a metallographic structure that is of a fibrous structure.
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