激光小孔型气孔产生原因及抑制方法  

Formation mechanism and suppression of keyhole porosity

作　　者：滕彬[1] 杨海锋[1] 王小朋[1] 王诗洋[1] 孙明辉 

机构地区：[1]机械科学研究院哈尔滨焊接研究所,150028 [2]福建省特种设备检验研究院宁德分院,352000

出　　处：《焊接》2015年第9期34-37,74,共4页Welding & Joining

摘　　要：气孔是常见的焊接缺陷,在传统熔化焊中,气孔产生的机理、影响因素及抑制的方法已为人们所熟知,而在激光深熔焊时还会产生一种特殊的气孔一小孔型气孔,在未焊透时这类气孔尤为明显,传统抑制气孔的方法对这种气孔无能为力,成为激光深熔焊亟需解决的问题之一。文中详细阐述了激光焊小孔型气孔的产生机理,并从影响这类气孔产生的因素入手,论述了抑制这类气孔的几种方法。Porosity in the welded joint is one of the major welding defects in the traditional fusion welding,the formation mechanism,influential factors and solutions to these metallurgical pores had been well known.Another special type of porosity known as keyhole pores can form in laser deep penetration welding.Compared with metallurgical pores,these pores are particularly evident in partial penetration welding,and cannot be eliminated by traditional methods to solve metallurgical pores,which has become one of the urgent problems to be solved in laser welding.The fundamental cause of keyhole pores formed in laser welding can be owned to the instability of keyhole was introduced with two models called Matsunawa- Katayama and Tsukamoto.The common methods to solving keyhole pores were discussed from three aspects to improve the keyhole stability,strengthen the ability and prolong the escaping time of gas in the weld pool,and reduce the gas content in liquid metal.

关 键 词：激光焊气孔 小孔 

分 类 号：TG441.7[金属学及工艺—焊接]