活性电子束焊接法研究

ACTIVATING ELECTRON BEAM WELDING

研究了表面活性剂在电子束焊中的行为,结果发现使用活性剂可以使电子束焊的熔深增加。在研究单一活性剂对焊接熔深影响规律的基础上,研制了由SiO、TiO2和Cr2O3等组成的不锈钢电子束焊活性剂,可使散焦电子束焊接熔深增加2倍多,焊缝表面成形良好。使用活性剂后,聚焦电流和束流对电子束焊熔深增加有较大影响。分析电子束焊熔深增加的原因认为:一方面,活性剂改变了熔池金属的表面张力梯度,使熔池金属的流动方向发生了改变,因此电子束焊熔深增加,焊缝变窄;另一方面,涂层物质的熔点较高,它的存在减小了电子束熔化母材的区域。在以上试验和分析的基础上提出了活性电子束焊的概念。

A study has been performed to examine the behavior of flux in electron beam welding , the result indicates that the penetration of electron beam welding can be increased by using the activating fluxes. A kind of activating flux composed of SiO2, TiO2 and Cr2O3 for welding of stainless steel is developed on base of investigation of the influencing pattern of mono flux on penetration, by which the penetration of EB welding can be increased more then two times. The formation of the weld surface is elegant. When using the flux, more important effect to the penetration increased is focus current and bind current. The reason that the flux increases the penetration lies in the following two aspects: firstly, the flux can change the surface tension gradients of weld pool then the direction of the fluid flows in weld pool been changed, thereby producing a relatively deeper and narrower weld. Secondly, the melt point of the flux is high than the metals, it reduce the melt square of the base material. On the base of above investigation bring forward the idea of activating EB welding .