Associated Press Writer CAIROâEgypt displayed on Monday newly discovered tombs more than 4,000 years old and said they belonged to people who worked on the Great Pyramids of Giza, presenting the discovery as more evidence that slaves did not build the ancient monuments.
Wave soldering is used for both through-hole printed circuit assemblies, and surface mount.In the latter case, the components are glued onto the surface of a printed circuit board (PCB) by placement equipment, before being run through the molten solder wave.lux in the wave soldering process has a primary and a secondary objective. The primary objective is to clean the components that are to be soldered, principally any oxide layers that may have formed. There are two types of flux, corrosive and noncorrosive.
1 Soldering is a process in which two or more metal items are joined together by melting and then flowing a filler metal into the jointâthe filler metal having a relatively low melting point. 2  Soldering is used to form a permanent connection between electronic components. This is called tinning and it will help the heat flow from the iron's tip to the joint. 2  The solder should flow onto the tip, producing a bright shiny surface. 3  If the solder will not flow onto the tip, clean it by wiping it on the wet sponge. 4  When tinned, wipe excess solder off on the wet sponge.