一、活性金属和难熔金属活性金属和难熔金属原先只用于宇航工业,而现在其应用愈来愈广泛。这两种金属有着共同的焊接问题。因此,将它们归纳在本节中。活性金属在高温下对氧和氮有很强的亲合力,并在化合时形成非常稳定的化合物。在低温下,活性金属的抗腐蚀能力极强。难熔金属的熔 First, the active metals and refractory metals Active metals and refractory metals were originally used only for the aerospace industry, and now its use is more and more widely. Both metals have a common welding problem. Therefore, they are summarized in this section. Active metals have strong affinity for oxygen and nitrogen at high temperatures and form very stable compounds when combined. At low temperatures, the active metal is extremely resistant to corrosion. Refractory metal melting