共查询到19条相似文献,搜索用时 109 毫秒
1.
2.
3.
研究了YAG激光、GTAW电弧复合焊接铝合金时各种规范参数对焊缝成型的影响规律 ,探讨激光与电弧的复合作用机理。结果表明 ,采用YAG激光 +GTAW复合工艺焊接铝合金具有焊缝成型美观、热影响区小等优点 ,与GTAW焊接相比 ,焊速显著提高 ,可以显著增加熔深 ,达到采用小功率激光焊机实现铝合金的焊接目的 ,Laser、GTAW是铝合金焊接理想的工艺方法。 相似文献
4.
超细颗粒焊剂约束电弧用于超窄间隙的焊接 总被引:2,自引:1,他引:1
为实现电弧约束良好、焊接过程稳定可靠的超窄间隙焊接,基于窄间隙埋弧焊的众多优点和对超窄间隙中的电弧进行约束以防止电弧攀升的思路,提出采用超细颗粒焊剂约束电弧以实现超窄间隙焊接的方法,研制专用的焊枪,开发出采用v形金属丝网衬垫焊剂颗粒的超窄间隙焊接工艺.结果表明,超细颗粒焊剂熔化后形成的熔渣壁可对电弧进行有效约束,实现稳定可靠的超窄间隙电弧焊.随着焊剂颗粒尺寸的减小,因焊剂松装密度的增加使得形成凸焊缝的倾向增加.采用V形金属丝网衬垫焊剂颗粒的工艺进行超窄间隙焊接,可以显著增强电弧对侧壁根部的加热效果,获得足够的侧壁根部熔透深度,从而保证了超窄间隙焊缝的熔合质量. 相似文献
5.
激光电弧复合焊是一种低成本、高适应性的焊接方法,在铝合金、不锈钢等难焊金属中,可不同程度的减少和消除了焊接缺陷。以A6N01铝合金为研究对象,进行了焊接坡口设计,研究了间隙变化量对焊缝成形的影响以及进行了焊接接头残余应力检测。结果表明:为了满足激光-MIG复合焊接的工艺,需要设计单独的坡口型式。通过降低焊接速度,间隙为2.0 mm时仍可获得良好焊缝成形。MIG焊接,激光-单丝MIG焊接、激光-双丝MIG焊接,沿着焊缝的应力除个别区域外,皆为小于150MPa的压应力,激光-单丝MIG焊接的焊件整体应力值较小。 相似文献
6.
7.
分析了铝合金激光焊接的工艺特性、技术难点和解决办法,阐述了多光束YAG激光焊接铝合金薄板的可能性,构建了多光束YAG激光焊接光路,解决铝合金薄板激光焊接过程的部分缺陷。如果合理使用保护气体并设置恰当的工艺参数,有可能解决铝合金薄板的YAG激光焊接难题,对其应用前景提出展望。 相似文献
8.
钢轨窄间隙全自动电弧焊电流稳定性分析及控制 总被引:3,自引:0,他引:3
采用钢轨窄间隙全自动电弧焊系统,对无缝钢轨线路的钢轨进行原位焊接,焊接过程中发现焊接电流电压存在较大波动,对焊接质量造成不利影响.分析造成焊接电流电压不稳定的主要原因,认为与采用陶瓷衬垫打底的异形窄间隙钢轨焊缝、焊丝伸出角度、不规则的进枪路径和进枪速度等钢轨窄间隙电弧焊焊接工艺有关.试验发现,除过程可控的工艺参数焊接电流和电压外,焊接速度变化对实际焊接电流也有较大影响.针对钢轨窄间隙电弧焊系统的工艺特点,提出采用电流传感的焊接速度与焊枪高度联合控制方法,通过焊接过程实时反馈焊接电流值,采用分段PID控制,优化控制焊枪多个方向的运动速度和位移,达到减小焊接电流电压波动,稳定电弧的目的.试验结果表明,该方法可以有效地稳定焊接电流,降低飞溅,并能在打底焊过程中有效避免断弧、熄弧现象的发生. 相似文献
9.
镁铝合金在焊接工艺应用时由于金属膨胀系数较大,所以铝合金焊接工艺操作进行时一般很难有效观察清晰其焊接熔池。因此,一旦焊接间隙过大,很可能促成其焊接熔池下榻:而如果间隙太小又会造成焊接缺陷的出现。基于此,文章主要提出了铝合金焊接工艺相对普遍的钨极氩弧焊方法,并与之提出了该工艺下焊接对铝合金的主要性能影响,以供参考。 相似文献
10.
张相福 《机械工人(热加工)》2011,(16):36-38
通过研究厚壁管窄间隙焊接侧壁熔透技术,开发厚壁大径管窄间隙TIG组合坡口,设计焊接该种坡口厚壁管的特定范围焊接参数,解决了厚壁大径管窄间隙焊的工艺难点,取得了良好的生产效果。 相似文献
11.
Process modeling and parameter optimization using neural network and genetic algorithms for aluminum laser welding automation 总被引:1,自引:1,他引:0
Young Whan Park Sehun Rhee 《The International Journal of Advanced Manufacturing Technology》2008,37(9-10):1014-1021
In the automotive industry, applying aluminum alloys to car chassis have become an important concern in order to reduce car weight. In aluminum laser welding, the strength of weld is typically reduced by porosity, underfill, and magnesium loss. In order to overcome these problems, laser welded with filler wire was suggested. In this study, experiments on the laser welding AA5182 of aluminum alloy with AA5356 filler wire were performed with respect to laser power, welding speed, and wire feed rate. The experiments showed that the tensile strength of the weld was higher than that of the base material under certain conditions. Using the experimental results, a neural network model was proposed to predict the tensile strength. To optimize the process parameters, a fitness function was formulated, taking into account weldability and productivity. A genetic algorithm was used to optimize the laser power, welding speed, and wire feed rate. The optimal value of these parameters was considered to be the proper process conditions in terms of weldability and productivity. 相似文献
12.
13.
14.
15.
16.
双相钢/铝合金激光胶接焊胶层作用分析 总被引:1,自引:0,他引:1
通过双相钢/铝合金激光胶接焊和激光焊接的对比分析,揭示钢上、铝下搭接激光胶接焊时胶层作用。对焊接过程进行等离子体形貌同步拍摄和焊接光谱采集并分析,与激光焊接比较,发现激光胶接焊时等离子体的颜色明亮,形态密度大,与试样板材表面呈一定角度,胶层分解产物利于改善下层铝合金表面高反射率的状况,等离子体对激光能量的吸收减少;而光谱相对强度和光致等离子体电子密度增加,胶层的存在增加试件对激光的吸收率;焊接成形试验发现胶层可起增加焊接熔深和熔宽的作用;剪切试验结果表明胶层提高焊接接头的平均抗剪强度。由于添加胶层加快上层双相钢冷却速度,增加下层铝合金对激光能量的吸收,导致下层Al向上层钢侧的扩散受到抑制,而熔宽两侧熔融态Al体积分数增多,焊接熔宽加大,增加钢、铝横向结合面积,提高焊合率,此外剪切力的外加载荷由焊缝和胶层共同承担,因此添加胶层改善了钢/铝焊接接头的力学性能。 相似文献
17.
18.
Modeling and optimization of Nd:YAG laser micro-weld process using Taguchi Method and a neural network 总被引:1,自引:1,他引:0
Hsuan-Liang Lin Chang-Pin Chou 《The International Journal of Advanced Manufacturing Technology》2008,37(5-6):513-522
The use of a pulsed Nd:YAG laser in the 0.1 mm- thick aluminum alloy lap micro-weld process was optimized. The welding parameters
that influence the quality of the pulsed Nd:YAG laser lap micro-weld were evaluated by measuring of the tensile-shear strength.
In this work, the Taguchi method was adopted to perform the initial optimization of the pulsed Nd:YAG laser micro-weld process
parameters. A neural network with a Levenberg-Marquardt back-propagation (LMBP) algorithm was then adopted to develop the
relationships between the welding process parameters and the tensile-shear strength of each weldment. The optimal parameters
of the pulsed Nd:YAG laser micro-weld process were determined by simulating parameters using a well-trained back-propagation
neural network model. Experimental results illustrate the proposed approach. 相似文献
19.
Porosity in fiber laser formation of 5A06 aluminum alloy 总被引:2,自引:0,他引:2
Yangchun Yu Chunming Wang Xiyuan Hu Jun Wang Shengfu Yu 《Journal of Mechanical Science and Technology》2010,24(5):1077-1082
The mechanism of porosity formation and its suppression methods in laser formation of aluminum alloy have been studied using
a 4kW fiber laser to weld 5A06 aluminum alloy with SAl-Mg5 filler. It was found that the porosity formation is closely related
to the stability of the keyhole and fluctuation of the molten pool in the laser welding aluminum alloy. The filling wire increased
the instability of the keyhole and weld pool, thus further increasing the amount of gas cavities in the joint. Prefabrication
of a suitable gap for the butt joint can provide a natural passage for the flow of the liquid metal, which can weaken, and
even completely eliminate the disturbance of the filling wire on the formation of keyhole. The gap can also provide a passage
for the escape of the bubble. Thus, this method can greatly decrease the sheet’s susceptibility to porosity. Moreover, for
a thin sheet, if the power of the laser is sufficient to form a keyhole with stable penetration through the weld sheet, a
weld bead without porosity can also be obtained because closing the keyhole is almost impossible. 相似文献