本文選題：螺柱焊 + 焊接成形��； 參考：《南京理工大學(xué)》2017年碩士論文

【摘要】：本文主要解決關(guān)于22SiMn2TiB中碳調(diào)質(zhì)高強(qiáng)鋼與中大直徑Q235實心螺柱之間的焊接缺陷問題,螺柱焊焊接方式的特點及高強(qiáng)鋼母材的特性導(dǎo)致焊接過程中容易出現(xiàn)焊縫外觀凸臺不成形及焊縫氣孔問題。針對于這些缺陷提出了大直徑鋼螺柱新型焊接方式:旋弧螺柱焊接方法、Cu鋁熱反應(yīng)及Fe鋁熱反應(yīng)-電弧螺柱焊接方法。焊接過程中的焊接電源接入選用型號為BMH-22SV拉弧式螺柱焊機(jī),進(jìn)行大量的探索性實驗并合理規(guī)劃工藝實驗路線,改善裝甲車等大型車輛的機(jī)械性能。旋弧裝置可以有效的控制焊接電弧的運動軌跡,形成優(yōu)質(zhì)的焊縫外觀成形,對于18mm直徑的螺柱,焊接接頭最大強(qiáng)度時的最佳焊接參數(shù):旋弧裝置輸入電流為0.4A,焊接電源輸入電流及拉弧時間分別為1250A,1200ms。旋弧焊接實心螺柱的缺陷是中心會出現(xiàn)一個孔,導(dǎo)致其焊縫力學(xué)性能不能達(dá)到最大值。Cu鋁熱反應(yīng)-拉弧螺柱焊焊接方法可以有效地解決旋弧焊接的缺陷問題,焊縫熔池的液態(tài)金屬流動性得到增強(qiáng),因為鋁熱反應(yīng)的熱量使焊接熱輸入總和增加,形成完整的外觀凸臺及解決焊縫未熔合問題,對于18mm直徑的螺柱,Cu鋁熱反應(yīng)-拉弧螺柱焊最佳工藝參數(shù):Cu鋁熱反應(yīng)劑添加量為2.2g,焊接電源電流接入數(shù)值及焊接拉弧時間分別為1200A,1200ms,此參數(shù)下的焊接接頭強(qiáng)度達(dá)到216MPa。Cu鋁熱反應(yīng)-拉弧螺柱焊焊接方法缺陷是金相微觀組織焊縫出現(xiàn)裂紋,貫穿整個焊縫,并向熱影響區(qū)延伸。針對于Cu鋁熱反應(yīng)-拉弧螺柱焊的缺陷,南京理工大學(xué)王克鴻老師團(tuán)隊提出Fe鋁熱反應(yīng)-拉弧螺柱焊焊接方法對其進(jìn)行優(yōu)化設(shè)計,解決外觀凸臺成形不良、接頭氣孔及焊縫未熔合等缺陷。反應(yīng)劑的添加量直接影響焊接質(zhì)量,對于Φ18mm鋼螺柱的最佳焊接參數(shù):Fe鋁熱反應(yīng)劑添加量為2.4g,拉弧式螺柱焊機(jī)輸入電流值及焊接時間分別為1250A,1200ms,焊接接頭抗剪強(qiáng)度達(dá)到307MPa。
[Abstract]:This paper mainly deals with the welding defects between 22SiMn2TiB medium carbon quenched high strength steel and medium and large diameter Q235 solid studs. The characteristics of stud welding and the characteristics of high strength steel base metal lead to the appearance of bevel and the problem of weld blowhole in welding process. Aiming at these defects, a new welding method of large-diameter steel stud is put forward, that is, the welding method of rotary arc stud and Fe aluminothermic reaction-arc stud welding method. In the welding process, the welding power supply is selected as BMH-22SV pull-arc stud welding machine. A large number of exploratory experiments are carried out and the technological experimental route is reasonably planned to improve the mechanical properties of large vehicles such as armored vehicles. The rotating arc device can effectively control the welding arc movement track, forming high-quality weld appearance, for the 18mm diameter stud, The optimum welding parameters are as follows: the input current of the rotary arc device is 0.4A, the input current of the welding power source and the time of arc pulling are 1250An 1200msrespectively. The defect of solid stud in spiral arc welding is that there will be a hole in the center, which leads to the failure to reach the maximum value of the mechanical properties of weld. The welding method of thermo reaction-pull stud welding can effectively solve the defect problem of spiral arc welding. The fluidity of liquid metal in the weld pool is enhanced because the heat of the thermal reaction increases the summation of the welding heat input, forms a complete appearance bump and solves the problem of the weld being not fused. For 18mm diameter, the optimum technological parameter of thermomechanical reaction-arc stud welding is 2.2g. the welding power current input value and welding arc drawing time are 1200An 1200msrespectively. The welding joint strength under this parameter is up to 1.2g. the welding strength of the welding joint under this parameter is up to 1 200 ms. the welding current input value and the welding arc drawing time are 1 200 ms. respectively. The defects of 216MPa.Cu thermal-reaction-arc stud welding method are the crack of metallographic microstructure weld. It runs through the weld and extends to the heat affected zone. Aiming at the defects of Cu thermal reaction-arc stud welding, the teacher Wang Kehong of Nanjing University of Science and Technology put forward a method to optimize the design of Fe aluminothermic reaction-arc stud welding to solve the problem of forming bad appearance bevel. Joint porosity and weld failure to fuse and other defects. The addition of reactants directly affects the welding quality. For 桅 18mm steel studs, the optimum welding parameter: Fe thermistor is 2.4 g, the input current value and welding time are 1250A1200msand the shear strength of welded joints is 307MPa.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG457.11

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本文編號：1985017