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.
Soldering is a process by which metal is heated and fused to fix a broken pipe. Solder is characterized into types based on how it melts. Hard solders have higher melting points, whereas soft solders have lower melting points. Different types of solders are used to repair various metals.However, only two types of solder should be used for water supply pipes---lead-free and 95/5 solid-core solder.Certain solders that contain some lead may be used for water drainage pipes if local plumbing code permits.owever, only two types of solder should be used for water supply pipes---lead-free and 95/5 solid-core solder. Certain solders that contain some lead may be used for water drainage pipes if local plumbing code permits.