前言微波元件的钎焊生产中,为了减少夹气、夹渣等缺陷,提高钎缝的致密性,采用不等间隙钎焊在生产实践中是行之有效的。近年来,不等间隙钎焊不仅在钎焊铜制波导中广泛应用,铝制波导钎焊也有所采用。对于不等间隙钎焊提高钎缝致密性的机理,我们过去曾指出:不等间隙钎焊时,钎料填缝前沿的紊乱现象将会改善,而且钎料填缝前沿还能自动调整,因而减少了“包围”现象,提高了致密性。另外,通过模拟试验后,我们曾推论:夹气、夹渣有可能从不等间隙内向外排出。国内还有人认为:不等间隙钎焊有能力消除钎料的树枝状漫流而产生一种序性漫流。但是,这些观点 Preface The production of brazed microwave components, in order to reduce the gas trap, slag and other defects, to improve the tightness of brazing seam, the use of unequal gap brazing in the production practice is effective. In recent years, unequal gap brazing has not only been widely used in brazing copper waveguides, but also aluminum brazing brazing has also been used. In the past, we pointed out in the past that the mechanism of increasing the compactness of brazing seam with unequal gap brazing will improve the disorder of front of filler metal during unequal gap brazing, and the front of brazing filler metal will be automatically adjusted. Therefore, Reduce the “encirclement” phenomenon, improve the density. In addition, through the simulation test, we have concluded: gassing, slag may be unequally discharged within the gap. Some people think that domestic: ranging from brazing the ability to eliminate brazing dendritic diffuse and produce a sequential flow. However, these views