中间层对304不锈钢/铌激光焊接头组织及性能的影响

Effect of Interlayer on Microstructures and Properties of 304 Stainless Steel/Nb Joints by Laser Welding

利用纯铜、纯银、纯钨、纯钒、纯钽和纯钼等不同金属材料作为填充金属,采用预置中间层的方法,进行了304不锈钢(304SS)与铌的激光焊接试验。结果表明,在被选择的填充金属中,铜和银作为中间层可以实现304SS与铌的焊接,前者接头强度最高,强度峰值达到250 MPa,是最优填充金属;随着铜层厚度的增加,铜层对于Fe2Nb的阻碍作用增强,接头强度提高,但是铜层厚度不能过大。

With different pure metal materials such as copper, silver, tungsten, vanadium, tantalum and molybdenum as filler metals , the experiments of laser welding of 304 stainless steel （304 SS） and niobium are carried out by using the preset interlayer method. The results show that, among all the filler metals to be selected, Cu and Ag as interlayer can be used to realize the connection between 304 SS and niobium. The joint strength with the former as interlayer is the highest which reaches up to 250 MPa, thus the optimum filler metal is Cu. The hindering effect of Cu interlayer on the formation of Fe2Nb increases with the increase of Cu interlayer thickness, and so does the strength of joints, but the Cu interlayer cannot be too thick.