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采用镍基钎料BNi-7真空钎焊316L不锈钢多孔管和304不锈钢致密管,对其焊接接头的显微组织结构进行了分析,研究了钎焊温度对焊接接头组织结构、抗拉强度和最大孔径的影响。结果表明,在钎焊过程中,不锈钢多孔管与致密管中的Fe和Cr溶解进了熔融的钎料里,与钎料内的合金元素相融合并向母材扩散,形成一定的焊缝组织和化学成分,完成牢固的冶金焊接。随着钎焊温度的提高,焊接接头的抗拉强度先升高后降低,而焊接接头的最大孔径则是先降低后升高。较佳的钎焊温度为980℃,在该温度下获得的样件在具有良好抗拉强度(240MPa)的同时,兼具适合的最大孔径(3.87μm)。
The nickel brazing filler metal BNi-7 was vacuum brazed 316L stainless steel porous tube and 304 stainless steel dense tube. The microstructure of the welded joint was analyzed. The effects of brazing temperature on the microstructure and tensile strength of the welded joint were studied. Influence of aperture. The results show that during the brazing process, the Fe and Cr in stainless steel porous tube and dense tube dissolve into the molten solder, fuse with alloying elements in the solder and diffuse into the base metal to form a certain weld seam structure And chemical composition, complete solid metallurgical welding. With the increase of brazing temperature, the tensile strength of welded joints first increases and then decreases, while the maximum diameter of welded joints decreases first and then increases. The preferred brazing temperature is 980 ° C, and the sample obtained at this temperature has a suitable maximum pore size (3.87 μm) with good tensile strength (240 MPa).