时间:2011-03-11 23:18来源:蓝天飞行翻译 作者:航空 点击:次
soldering. A method of thermally joining metal parts with a molten nonferrous alloy that melts at a temperature below 800°F (427°C). The molten alloy is pulled up between close-fitting parts by capillary action. When the alloy cools and hardens, it forms a strong, leak-proof connection. soldering iron. A hand-held tool used to melt solder. Modern soldering irons are electrically heated and use a tinned copper tip (a copper tip covered with solder) to melt the solder. soldering pistol. A special type of hand-held tool used to melt solder. The heating element is a transformer whose secondary winding is a single turn that extends out of the transformer in the form of two connections for the ends of a copper tip. When the solder is ready to be melted, a trigger switch in the primary winding is pulled. When primary current flows, a low voltage but high current is induced into the single-turn secondary. This current flows through the copper tip and heats it enough to melt the solder. As soon as the soldered joint is made, the trigger is released, and the tip cools off. solderless connector (electrical wires). A crimped-on connector used to fasten a terminal to an electrical wire. solenoid. An electromagnet with a movable iron core that can be pulled into the coil. When current flows in the coil, the resulting magnetic field pulls the core into its center. When no current is flowing in the coil, a spring moves the core out of the coil. Solenoids can be used to operate valves, switches, and mechanical locks, as well as many other types of devices. solid. A material whose internal structure holds it tightly in its original shape and size. A solid differs from a liquid, whose structure causes it to hold only its size, not its shape, and a gas, that holds neither its size nor its shape. |