本文選題：摩擦塞焊 + 焊接熱循環(huán)　； 參考：《天津大學(xué)學(xué)報(自然科學(xué)與工程技術(shù)版)》2017年07期

【摘要】：利用自主研發(fā)的摩擦塞焊設(shè)備對摩擦塞焊圓柱形試樣進行試驗,試樣材料選擇D36高強鋼,通過溫度巡檢儀采集焊接過程中溫度演化數(shù)據(jù),試驗后對焊接接頭進行宏觀形貌、金相組織、硬度以及拉伸性能的研究.結(jié)果發(fā)現(xiàn):在焊接過程中,溫度先迅速升高,之后緩慢降低,塞孔底部最先升溫,溫度峰值出現(xiàn)在塞孔側(cè)壁中間處;塞棒端部和塞孔底部帶有倒角的試樣可以獲得無缺陷的焊接接頭;焊接接頭中母材組織為軋制后的鐵素體和珠光體的帶狀組織,焊縫組織和上部熱影響區(qū)組織為上貝氏體,而塞孔底部倒角處的熱影響區(qū)以細小的鐵素體和珠光體組織為主;焊接接頭的硬度分布一般為母材最低,熱影響區(qū)次之,焊縫最高;當(dāng)塞棒端部和塞孔底部的倒角達到4,mm時,摩擦塞焊焊接接頭拉伸試驗的斷裂位置在母材處,保證了焊接接頭的拉伸性能.
[Abstract]:The friction plug welding equipment was used to test the cylindrical specimen of friction plug welding. The sample material was D36 high strength steel. The temperature evolution data during the welding process were collected by the temperature inspection instrument, and the macroscopic morphology of the welded joint was carried out after the test.Metallographic structure, hardness and tensile properties.The results show that in the welding process, the temperature rises rapidly, then decreases slowly, the bottom of the plug first heats up, and the temperature peak appears in the middle of the side wall of the plug hole.The specimens with chamfering at the end of the plug rod and at the bottom of the plug hole can obtain the welded joint without defects; the parent metal structure in the welded joint is the strip structure of the rolled ferrite and pearlite, and the microstructure of the weld and the upper heat-affected zone is upper bainite.The heat affected zone at the bottom corner of the plug hole is mainly composed of fine ferrite and pearlite. The hardness distribution of the welded joint is generally the lowest in the base metal, the second in the heat affected zone, and the highest in the weld, and when the chamfer between the end of the plug rod and the bottom of the plug hole reaches 4 mm,The fracture position of the friction plug welded joint is at the base metal, which ensures the tensile properties of the welded joint.
【作者單位】： 天津大學(xué)材料科學(xué)與工程學(xué)院;天津市現(xiàn)代連接技術(shù)重點實驗室;
【基金】：國家高技術(shù)研究發(fā)展計劃(863計劃)資助項目(2011AA090302)~~
【分類號】：TG457.11

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