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国外制造电真空器件(尤其是大型器件)采用的金属焊接方法主要是钎焊、电阻焊、钨极惰性气体保护焊、少量应用电子束焊,超声焊和真空扩散焊。目前国外应用高能束焊接金属发展较快。在电子束焊、微束等离子弧焊和激光焊方面进行了大量理论研究和应用研究工作。现将国外有关高能束焊接发展情况简要介绍如下。一、电子束焊电子束焊是最近十多年发展起来的新工艺。它的优点是焊缝窄而深(深宽比最高可达50:1),焊缝金属不受污染,焊接规范可精确
Foreign manufacturers of electric vacuum devices (especially large devices) used in metal welding methods are mainly brazing, resistance welding, tungsten inert gas welding, a small amount of application of electron beam welding, ultrasonic welding and vacuum diffusion welding. At present, foreign applications of high-energy beam welding metal developed rapidly. In electron beam welding, micro beam plasma arc welding and laser welding conducted a lot of theoretical research and applied research. Now abroad about the development of high-energy beam welding briefings are as follows. First, the electron beam welding Electron beam welding is the development of the last ten years of new technology. It has the advantage of narrow and deep welds (aspect ratio up to 50: 1), weld metal free from contamination and precise welding specifications