本文關(guān)鍵詞：材料性能對鋁合金攪拌摩擦焊焊縫成形的影響　出處：《南昌航空大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 攪拌摩擦焊 材料性能 塑性金屬流動 焊核尺寸 接頭抗拉強度

【摘要】：本課題采用自主設(shè)計的左螺紋圓柱形攪拌頭對10mm厚的1060純鋁、5A06和7075鋁合金進行同種及異種材料攪拌摩擦焊對接實驗,通過同種材料對接,研究材料性能和焊接工藝參數(shù)對攪拌摩擦焊焊縫成形及接頭抗拉強度的影響;通過異種材料和同種材料異種狀態(tài)的對接焊和疊層焊接,研究了材料性能對焊縫塑性金屬流動行為的影響規(guī)律。研究結(jié)果表明:隨著被焊材料強度、硬度的增大,焊接速度和攪拌頭旋轉(zhuǎn)速度對焊縫成形的影響強度增大。強度、硬度低的材料獲得良好焊縫成形的可選擇工藝參數(shù)范圍更廣,且不容易出現(xiàn)缺陷。強度、硬度高的材料則只能在較窄的工藝參數(shù)范圍內(nèi)形成良好的焊縫。在相同的焊接工藝參數(shù)下,被焊母材性能不同時,焊核尺寸表現(xiàn)出不同的規(guī)律。在一定范圍內(nèi),增大攪拌頭旋轉(zhuǎn)速度和減小焊接速度都會使焊核尺寸變大。同種材料攪拌摩擦焊接時,強度、硬度低的材料,焊縫周圍金屬對焊縫塑性金屬的約束作用力小,焊核尺寸和面積較強度、硬度高的材料更大。異種材料焊接時,在焊接參數(shù)相同的情況下,攪拌針表面螺紋與強度、硬度低的材料的焊縫金屬過早地發(fā)生滑動摩擦導(dǎo)致驅(qū)動力不足,焊核寬度和面積更小,焊縫中心向強度、硬度高的材料一側(cè)偏移。同種材料的異種狀態(tài)疊層實驗發(fā)現(xiàn),不同厚度的焊縫橫截面表現(xiàn)出不同的形貌,軸肩作用區(qū)金屬變形程度最大且在兩種金屬匯合程度較大的紊流區(qū)產(chǎn)生缺陷。攪拌針兩側(cè)金屬層發(fā)生較大變形且厚度減小,其中強度、硬度低的材料減小的程度更大。
[Abstract]:This topic uses the left threaded cylindrical designed mixing head on 1060 pure aluminum 10mm thick, 5A06 and 7075 Aluminum Alloy were stirring friction welding docking experiments of similar and dissimilar materials, by the same material docking, the effects of material properties and welding parameters on friction stir welding of tensile strength and joint shape by butt welding; dissimilar materials and the same material dissimilar state and laminated welding, studied the influence of weld material properties of plastic metal flowing behavior. The results show that with strength of welding materials, hardness increases, influence of welding speed and rotational speed on the weld strength. Strength, low hardness of the material good weld can be more a wide range of process parameters, and not prone to defects. The strength, the hardness of the material is only in a narrow range of process parameters to form a good The weld in the same welding parameters, welding performance is not at the same time, the nugget size showed different rules. In a certain range, increasing the rotating speed and the decrease of welding speed will make the weld nugget size. Friction stir welding of the same material, strength, low hardness material and around the weld metal on the weld metal plastic constraint force is small, the nugget size and area compared with the strength and hardness of the material is larger. Welding of dissimilar materials, the welding parameters are the same, the pin thread surface and strength of weld metal materials to premature low hardness of the sliding friction caused the lack of driving force, welding width and smaller area, to the center of weld strength, material side offset high hardness. Found dissimilar laminated materials of the same kind of experimental condition, the weld cross section with different thickness exhibit different morphology, shoulder region The deformation degree of metal is the largest and the defect occurs in the turbulent area where the two metals converge. The metal layer on both sides of the stirred needle has larger deformation and thickness decreases, and the material with lower strength and hardness decreases more.

【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG453.9

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