Читать книгу Material science. Жаратылыстану факультеттерінің студенттеріне арналған әдістемелік құрал - Шолпан Гумарова - Страница 10

Solders are special alloys used to obtain a mechanically strong (sometimes tight) joint or a permanent electrical contact of low resistance. Prior to soldering, the metal portions to be joined and the solder must be heated. Since the solder has a much lower melting point than the metals to be joined, it melts, while the metals remain hard. At the place where the molten solder comes in contact with the hard metal, complex physicochemical processes take place. The molten solder wets the metal, spreads over it and fills in the gaps between the metal parts. In this process, the solder diffuses into the base metal which dissolves in the solder and thus forms an intermediate layer (seam) that after hardening fastens the parts together into an integral assembly.