7A52铝合金焊缝应力腐蚀性能研究

Research of Stress Corroded Properties on Welding Joint of 7A52 Aluminum Alloy

本文用20mm厚的7A52铝合金板材，采用钨极氩孤焊接工艺焊接，用慢应变速率实验方法，应变速率为1．58×10^-6s^-1，在3．5％氯化钠溶液和惰性气体中，研究了7A52铝合金焊接接头的应力腐蚀性能。试验结果表明：7A52铝舍金焊缝对应力腐蚀较为敏感，在3．5％氯化钠溶液中应力腐蚀断裂均发生在焊缝熔合线附近区，而在惰性气体中试样断裂发生在焊缝中间部位。

Metal-Inert Gas welding of 7A52 aluminum plate of 20 mm thickness were completed, stress corrosion properties Of welding joint of 7A52 aluminum alloy is research by 1.58 ×10^-6s^-1 slow strain rate tests in 3.5 % NaCl solution and the inert gases. Test results show： welding joint of 7A52 aluminum alloy is sensitivity on stress corrosion. Stress corrosion cracking happen to the neighborhood of weld junction in 3.5 %NaCl solution, and that stress corrosion cracking happen to the middle of weld junction in the inert gases.