(中南大學(xué) 材料科學(xué)與工程學(xué)院， 長沙 410083)
摘 要: 采用進(jìn)口4047焊絲對(duì)2519鋁合金進(jìn)行熔化極惰性氣體保護(hù)焊（MIG）， 對(duì)焊接接頭的力學(xué)性能和顯微組織進(jìn)行了研究。結(jié)果表明， 2519鋁合金焊接性能較好，由于熱循環(huán)的作用， 焊接接頭的力學(xué)性能相對(duì)于基材發(fā)生了較大變化。 2519鋁合金焊接接頭的力學(xué)性能低于基材的性能，焊縫處是合金接頭的最薄弱環(huán)節(jié)， 其次是焊接熱影響區(qū)內(nèi)的軟化區(qū)， 強(qiáng)化相粒子發(fā)生過時(shí)效而粗化是形成軟化區(qū)的主要原因。
關(guān)鍵字: 2519鋁合金；焊接接頭； 顯微組織
GONG Min-ru， ZHOU Zhuo-ping
（ School of Materials Science and Engineering， Central South University， Changsha 410083， China）
Abstract: 2519 aluminum alloy was welded by using imported 4047 welding wire with method of MIG. The mechanical properties and microstructures of welded joint were studied. The results show that the weldability of 2519 aluminum alloy is fairly good, but due to the weld thermal cycle, the mechanical properties of the welded joint have changed greatly to the base metal relatively. The mechanical properties of 2519 aluminum alloy welded joint are worse than those of the base metal. The weld zone is the weakest point in welded joint, and the soften zone in heat-affected zone(HAZ) is the second weakest point in welded joint, which is formed due to the overageing of the main strengthening phase particles leading to coarsening.
Key words: 2519 aluminum alloy; welded joint; microstructure
