华中科技大学
硕士学位论文
激光—MIG电弧复合焊接基础研究及应用
姓名：王治宇
申请学位级别：硕士
专业：材料加工工程
指导教师：胡伦骥
20060424
华 中 科 技 大 学 硕 士 学 位 论 文
摘要
激光—电弧复合焊接是一种新兴的特种激光加工技术，它将两种物理性质、能量传输机制截然不同的激
光和电弧热源复合在一起，同时作用于同一加工位置，既充分发挥了两种热源各自的优势，又相互弥补了各自的不足，从而形成了一种全新高效的热源。
激光—电弧复合热源至少是一种激光热源(CO2、YAG等)与一种弧焊热源(TIG、Plasma、MIG/MAG)的组合，激光—MIG复合热源因其焊接效率高、间隙适应性好、焊缝成分和性能可控等优点正在成为工业生产中最重要的激光焊接方法之一。
本文在总结国内外激光—电弧复合热源焊接研究现状基础上，对激光—MIG复合焊接技术进行了工艺基础及应用的研究。首先建立了CO2激光—MIG电弧旁轴复合热源系统，以普福利薪酬
通碳钢为试材进行了堆焊试验，对焊缝的横断面几何形貌进行了测定，结果显示，复合焊较激光、电弧焊的熔深、熔宽增加，焊缝成型更美观，复合激光功率越大，作用效果越明显。
随后利用Nd:YAG激光—MIG电弧复合热源系统对激光功率、电弧功率、焊接速度、焊接方向等参数与焊缝形貌之间的关系进行了研究，讨论了激光与电弧的交互作用。研究表明：在一定的焊接工艺条件下，激光功率主要影响复合焊缝熔深，而电弧功率主要影响熔宽，激光电弧的交互作用有利于增加熔深，却负作用于熔宽的增加；当一定功率的Nd:YAG激光与电弧热源复合时，焊缝熔深随着电弧功率的增大先增后减，熔深最运动会稿
大时，电弧功率与复合热源功率的比值约为0.6。对应的其它实验结果也表明：复合热源焊接效率提高，焊前适应性好。
最后，将激光—MIG复合焊接技术应用于ZL114铝合金的焊接，成功地实现了2mm和8mm厚平板及筒体复合热源的拼焊。
关键词：激光—MIG复合焊接激光加工Nd:YAG激光
电弧功率焊缝形貌铝合金
华 中 科 技 大 学 硕 士 学 位 论 文
Abstract
Lar–arc hybrid welding is a new special welding technique in lar processing, in which the lar beam and the arc act on the same molten无偿献血活动
pool, the synergistic actions of the lar and the arc were exploited, improving the welding efficiency compared wi避孕套破了怎么办
th the individual process.
A descriptive term of lar–arc process should include the lar CO2, Nd:YAG) and the arc welding process(TIG, Plasma, MIG/MAG), and hybrid lar–MIG welding becomes one of the most significant lar welding technologies in industry due
to its higher welding efficiency, higher tolerance to gaps between plates, and adjustment of composition and microstrcture of the weld metal.
Bad on summarization of the current rearch on hybrid welding technique, a program of experimental work was undertaken to investigate the hybrid lar–MIG welding process and its application in this paper. First a paraxial CO2 lar–MIG hybrid welding system was t up and produced bead–on–plate runs on carbon steel under different welding conditions, the weld bead 卫生与健康手抄报
shape were measured. The results show that the lar–MIG hybrid welding can increa penetration and width, improve the quality of weld bead formation compared with lar and arc welding, and the higher the lar power, the more significant the effect.
Then a Nd:YAG lar–MIG hybrid welding system was ud to study the relationship between hybrid welding parameters and bead geometry, the parameters like lar power, arc power, welding speed, welding 行书书法大全
dir中秋美食
ection etc greatly influenced the weld bead. Influence of interaction between lar and arc energy on bead geometry was analyzed, it was found that正式合同
under stated condition the weld penetration mainly depends on the lar power and the width depends on the arc power, the reciprocity of lar and arc contributes
a positive effect on penetration, but a negative effect on weld width. With a certain
华 中 科 技 大 学 硕 士 学 位 论 文
constant power of Nd:YAG lar combined with the arc, the weld penetration went deeper at first and then reduced as the arc power incread, when penetration was in peak value, the energy ratio of arc power to hybrid power was about 0.6. Later the advantages of hybrid welding compared with lar or MAG welding alone were assd, and a ries of adaptability experiments of lar–MIG hybrid welding were carried out. The results indicate that the lar–MIG hybrid welding improves welding efficiency and owns good welding adaptability.
At last, the西装英语
application of lar–MIG hybrid welding on ZL114 aluminum alloy was realized on the 2–8mm thick plates and cylinders butt joints.
Key words: Lar–MIG hybrid welding Lar processing Nd:YAG lar Arc power Bead geometry Aluminum alloy
华 中 科 技 大 学 硕 士 学 位 论 文
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