采用矩形光斑CO_2激光为热源,以AlSi12作为填充焊丝进行钛/铝异种合金的激光熔钎焊试验,发现气孔是导致接头失效的一个主要因素.结果表明,钛/铝异种合金激光熔钎焊的气孔缺陷主要是由镁元素的气化所致.光束的偏移量及激光功率是影响气孔产生的主要因素.界面棒状的金属间化合物长度低于10 μm时一般不产生气孔,而气孔的直径与焊缝内部的微观组织有关.
The laser welding-brazing experiment of Ti/Al dissimilar alloys was performed with rectangular spot CO_2 laser as heat resource and AlSi12 as the filler wire. It is found that the porosity in the seam is a main factor for weak joint. The results indicate that the gasification of element Mg causes the formation of porosity during the welding. The offset of the laser beam toward Ti alloy and heat input markedly influence the formation of the porosity. In general no porosity is observed in the seam when the length of claviform intermetallic compound is less than 10 μm. Moreover, the microstructure in the seam plays a key role in the diameter of the pore.
参考文献
| [1] | Rendigs K H .[J].Materials Science Forum,1997,242:11. |
| [2] | Miller W S;Zhuang L;Bottema J et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2000,280(01):37. |
| [3] | Takemoto T;Okamoto I .[J].Journal of Materials Science,1988,23(04):1301. |
| [4] | 朱颖;赵鹏飞;康慧 et al.[J].焊接,2002,11(02):130. |
| [5] | Wei R J;Jiang L Y;Tao F .[J].Materials Letters,2002,56(05):647. |
| [6] | Sohn W H;Bong H H;Soon H .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2003,355(1-2):231. |
| [7] | 姚伟;吴爱萍;邹贵生 et al.[J].稀有金属材料与工程,2007,36(04):700. |
| [8] | Kahraman N;Gulenc B;Findik F .[J].International Journal of Impact Engineering,2007,34:1423. |
| [9] | Majumdar B.;Weisheit A.;Mordike BL.;Galun R. .FORMATION OF A CRACK-FREE JOINT BETWEEN TI ALLOY AND AL ALLOY BY USING A HIGH-POWER CO2 LASER[J].Journal of Materials Science,1997(23):6191-6200. |
| [10] | Kreimeyer M;Wagner F;Vollertsen F .[J].Optics and Laser in Engineering,2005,43(09):1021. |
| [11] | 陈树海,李俐群,陈彦宾.光斑形式对Ti/Al异种合金激光熔钎焊特性的影响[J].焊接学报,2008(06):49-52. |
| [12] | 陈树海,李俐群,陈彦宾.铝/钛异种合金激光熔钎焊接头界面特性[J].中国有色金属学报,2008(06):991-996. |
| [13] | 陈树海,李俐群,陈彦宾.矩形光斑钛/铝异种合金激光熔钎焊[J].中国激光,2008(12):2036-2041. |
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