摘要激光-MIG电弧复合焊接是新兴技术之一,具有极其光明的前景。该技术具有可以以较大的速度焊接,焊接以后残余应力小,焊缝的形状好看等优点。本课题采用厚度为8mm的Q345钢,进行光纤激光-MIG电弧复合焊接试验,研究了各种焊接工艺参数对焊缝的熔深以及熔宽的影响。28726
重点研究了MIG电弧电流、焊接速度、激光功率等焊接工艺参数对焊缝成形的影响规律。研究结果显示,在不同的电流值区间,焊缝熔深呈现一定的变化规律,在130~170A时,电流增大,熔深增大,超过170A,电流增大,熔深减少;焊接速度增大,焊缝熔深、熔宽都减小,在相同的试验条件下,复合焊接的熔深比相同功率的激光焊接快;随着激光功率的增加,复合焊接的熔深和熔宽都逐步增加,而焊缝熔深的增加幅度更大。
关键词 激光-MIG复合焊接;工艺参数;力学性能
毕业论文设计说明书外文摘要
Title Robot laser-arc compound welding experiments
Abstract
Laser -MIG arc compound welding is one of the emerging technology,which has the extremely bright prospect .It has fast speed, welding residual stress is small, weld quality, etc .This research uses the steel of Q345 , thickness of 8 mm .Optical fiber laser and MIG arc composite welding experiment was carried out.To study the various kinds of welding process parameters influence of on the weld penetration and the welding pool width. Research is mainly focused on the MIG arc current, welding speed, laser power, etc. The influence of welding parameters on welding are studied .
The results showed that in different current range, weld penetration to present certain change rule, in 130 ~ 170 A, current increase, penetration increases, more than 170 A, current increase,the depth of molten are reducing .Welding speed increase, the weld depth and weld width were decreased, under the same experimental conditions, the composite welding penetration is faster than the same power of laser welding .Composite with the increase of laser power, welding of the width and depth of molten gradually increased, and the increase of the depth of molten weld amplitude is greater.
Keywords Laser-arc hybrid welding;Welding Process;Mechanical Property;
目 次
1 引言(或绪论)1
1.1机器人激光-电弧复合焊接技术原理及特点1
1.2机器人激光-电弧复合焊接复合形式及特点2
1.3机器人激光-电弧复合焊接技术的发展现状3
1.4课题的目的、意义、内容5
2 试验材料与条件 6
2.1试验材料 6
2.2试验设备 6
3 低碳钢机器人激光-电弧复合焊接工艺试验研究9
3.1焊缝成形性9
3.2工艺参数对熔深以及熔宽的影响 12
4激光电弧复合焊接接头显微组织和力学性能测试分析 16
4.1试件的显微组织 16
4.2试件的显微硬度 18
4.3试件的拉伸试验 19
结论 19
致谢 20
参考文献 21
1 引言
1.1 机器人激光-电弧复合焊接技术原理及特点
激光-电弧复合焊接是将电弧和激光复合起来共同作用在试件的表面上,从而获得熔深大力学性能良好的接头的焊接方法。该焊接方法将两种能量传输机制以及物理性质完全不同的热源复合在一起,共同作用于同一个加工位置,经激光束产生的热源和电弧产生的热源的相互作用以及这两种热源与工件的作用,来完成焊接[1~3]。
激光-电弧复合焊接是一种新的焊接技术,与传统的焊接技术相比,具有高功率密度、低热输入量等特点,而且焊缝成形好、焊接速度快,激光和电弧的相互作用,提高了激光的电光能量转换效率以及激光能量的利用率,焊接过程更快[4]。同时,它还是一种适应各种焊接条件、功能齐全、可焊接出误差很小的工件的精密焊接方法 机器人激光-电弧复合焊接试验研究:http://www.751com.cn/cailiao/lunwen_23686.html