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7a52 lv he jin ji qi han jie jie tou chong ji ren xing yan jiu
Author(s): 
Pages: 7-9
Year: Issue:  10
Journal: Welding Technology

Keyword:  铝合金焊接接头冲击韧性断口形貌;
Abstract: 研究了不同温度下7A52铝合金及其焊接接头冲击韧性的变化规律.用JBN-300B半自动冲击试验机测试了材料的冲击韧性,用S-3400N扫描电子显微镜观察了冲击断口的表面形貌.结果表明:同一温度时,由焊缝到热影响区再到母材的冲击韧性依次升高.同一区域在不同温度时,韧性变化均不明显,母材、热影响区和焊缝的冲击韧性在40℃较高,分别为26.3,18.8,9.6 J/em2;在-20℃较低,分别为22.9,13.8,6.2 J/cm2.扫描电镜观察发现,7A52铝合金及其焊接接头断口均为韧窝断口,韧窝形状和数量有所不同.
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