本文選題：回填式攪拌摩擦點焊 + LY鋁合金�。� 參考：《焊接學報》2017年05期

【摘要】：為研究回填時間對回填式攪拌摩擦點焊接頭斷裂模式和斷裂機理的影響,對上下板厚度分別為1.5 mm和2 mm的LY12鋁合金板材進行了點焊試驗,并對焊后接頭進行拉剪試驗.結果表明,當回填時間較短時,套筒作用區(qū)與熱力影響區(qū)間界面上的原子擴散效果差,甚至在近表面附近出現(xiàn)開裂,導致接頭的剪切-塞型斷裂.當回填時間足夠長時,焊接接頭的斷裂模式轉化為剪切斷裂,裂紋主要沿著上下板搭接面擴展.同時,顯微結構、硬度與斷口形貌的試驗結果驗證了文中對斷裂機制的解釋.
[Abstract]:In order to study the effect of backfilling time on fracture mode and fracture mechanism of backfill friction stir spot welding joint, spot welding tests were carried out on LY12 aluminum alloy sheet with upper and lower plate thickness of 1.5 mm and 2 mm respectively, and tensile and shear tests were carried out on the joint after welding. The results show that when the backfill time is relatively short, the atomic diffusion effect on the interface between the sleeve interaction zone and the thermal influence zone is poor, and even cracking occurs near the surface, which leads to the shear-plug fracture of the joint. When the backfill time is long enough, the fracture mode of welded joint is transformed into shear fracture, and the crack mainly propagates along the lap joint of upper and lower plates. At the same time, the experimental results of microstructure, hardness and fracture morphology verify the explanation of fracture mechanism in this paper.
【作者單位】： 沈陽航空航天大學航空航天工程學部;北京航空航天大學機械工程及自動化學院;
【基金】：國家自然科學基金資助項目(51204111) 遼寧省自然科學基金資助項目(2014024008)
【分類號】：TG407
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本文編號：2013431