發(fā)布時(shí)間：2019-08-11 16:17

【摘要】：采用雙面雙弧同步立焊工藝方法,對(duì)8 mm厚5083鋁合金進(jìn)行自熔試驗(yàn),I形坡口一次熔透,焊縫成形美觀。通過調(diào)節(jié)兩側(cè)電弧熱量配比研究熔池成形規(guī)律,并從焊接接頭的微觀組織、力學(xué)性能分析其連接機(jī)理。研究結(jié)果表明,隨著熱輸入的增加,雙面雙弧同步立焊熱量加速集聚,熔深以三次冪函數(shù)的速度增大。雙面雙弧同步立焊接頭輪廓呈"雙曲線形",而相同熱輸入下的單面焊接頭則呈"倒馬鞍形"�？偀彷斎胍欢ǖ那闆r下,雙面雙弧接頭正面熔寬隨能量配比系數(shù)的增大而增大,反面熔寬隨能量配比系數(shù)的增大而減小,中間熔寬基本不變,熔化面積隨能量配比系數(shù)的增大先增大后減小;能量配比系數(shù)一定時(shí),隨著焊速的增大,接頭熔寬和熔化面積均減小。母材組織為條帶狀纖維織構(gòu),熱影響區(qū)發(fā)生靜態(tài)回復(fù)與再結(jié)晶,變形組織消失,產(chǎn)生新晶粒,焊縫區(qū)主要由α-Al固溶體、β相(Al_8Mg_5)質(zhì)點(diǎn)和骨骼狀的Mg_2Si析出相組成。焊縫的抗拉強(qiáng)度隨著能量配比系數(shù)的增大而減小,拉伸斷裂形式為韌性斷裂。熱影響區(qū)出現(xiàn)軟化現(xiàn)象,雙弧交匯區(qū)硬度低于正面焊縫區(qū)。
[Abstract]:The self-fluxing test of 8 mm thick 5083 aluminum alloy was carried out by double-sided double-arc synchronous vertical welding. The I-groove was penetrated once and the weld shape was beautiful. The forming law of molten pool is studied by adjusting the ratio of arc heat on both sides, and the bonding mechanism is analyzed from the microstructure and mechanical properties of welded joint. The results show that with the increase of heat input, the heat of double-sided double-arc synchronous vertical welding accelerates and the penetration increases with the speed of cubic power function. The profile of double-sided double-arc synchronous vertical welding head is "hyperbolic", while the single-sided welded joint with the same heat input is "inverted saddle". When the total heat input is certain, the front melting width of double-sided double-arc joint increases with the increase of energy ratio coefficient, while the reverse melting width decreases with the increase of energy ratio coefficient, the intermediate melting width is basically unchanged, and the melting area increases at first and then decreases with the increase of energy ratio coefficient. When the energy ratio coefficient is constant, the melting width and melting area of the joint decrease with the increase of welding speed. The microstructure of the base metal is banded fiber texture, the static recovery and crystallization occur in the heat affected zone, the deformed structure disappears and new grains are produced. The weld zone is mainly composed of 偽-Al solid solution, 尾 phase (Al_8Mg_5) particles and skeletal Mg_2Si precipitated phase. The tensile strength of weld decreases with the increase of energy ratio coefficient, and the tensile fracture form is ductile fracture. The hardness of double arc intersection zone is lower than that of front weld zone.
【作者單位】： 南京理工大學(xué)材料科學(xué)及工程學(xué)院;青島四方車輛研究所有限公司;
【分類號(hào)】：TG457.14

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