CAJ | 학술논문

采用光学显微镜、拉伸试验机、显微硬度计和疲劳试验机对FSW及M IG焊接接头的微观组织及力学性能进行了研究。结果表明：FSW焊核区为细小的等轴晶，热机械影响区呈现为被拉长的畸变晶粒，热影响区的组织明显粗化；MIG接头焊缝区晶粒为明显的铸态组织，热影响区晶粒长大情况也比FSW严重。与MIG相比，搅拌摩擦焊焊接（FSW）接头的抗拉强度相对较高，最小硬度值出现在后进侧的热影响区；高周疲劳（Nf＞107）时，FSW的接头疲劳强度高于M IG接头疲劳强度，高出约14％。
채용광학현미경、랍신시험궤、현미경도계화피로시험궤대FSW급M IG한접접두적미관조직급역학성능진행료연구。결과표명：FSW한핵구위세소적등축정，열궤계영향구정현위피랍장적기변정립，열영향구적조직명현조화；MIG접두한봉구정립위명현적주태조직，열영향구정립장대정황야비FSW엄중。여MIG상비，교반마찰한한접（FSW）접두적항랍강도상대교고，최소경도치출현재후진측적열영향구；고주피로（Nf＞107）시，FSW적접두피로강도고우M IG접두피로강도，고출약14％。
Microstructure and mechanical properties of MIG and Friction stir welded 6005A‐T6 and 6082‐T6 aluminum alloy were investigated by optical microscope , tensile tester , Vickers hardness tester and fatigue and fatigue tester .The result show that the nugget zone (NZ) has a fine equiaxed grain structure ,the grain in the thermo‐mechanical affected zone(THAZ) have been elongated ,The grains are obviously grew up in the heat affected zone(HAZ) .The weld metal zone of MIG is casting microstructure ,and the growth of the HAZ is serious than that of FSW .Compared to MIG ,the tensile strength of the joints welded by FSW is relatively higher and the lowest hardness appeared in the HAZ of retreating side ,the fatigue strength of the FSW joints is about 14% higher than that of M IG .