CAJ | 학술논문

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.
채용구형광반CO_2격광위열원,이AlSi12작위전충한사진행태/려이충합금적격광용천한시험,발현기공시도치접두실효적일개주요인소.결과표명,태/려이충합금격광용천한적기공결함주요시유미원소적기화소치.광속적편이량급격광공솔시영향기공산생적주요인소.계면봉상적금속간화합물장도저우10 μm시일반불산생기공,이기공적직경여한봉내부적미관조직유관.
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.