Carl Stokes served as the Cleveland, Ohioâs mayor from 1967 to 1971. He was one of the first African Americans to be elected mayor in a major U.S. city.
Tin and Lead There are many different metals in solder. Some of the metal an  individual may find in solder are: lead, tin, copper, and aluminum. answ2. Solders are still mad â¦ e of alloys of tin and lead, and with the addition of other metals to provide particular performance.Some solders contain no lead, and there exist solders of SnZn for soldering aluminum.oldering wire is made from an alloy of tin and lead. Typically, it  is 60% tin, and 40% lead. Soft solder is made of an alloy of tin and lead. Hard solders (for jewelry work) a usually made mainly our of the metal being worked (e.g. silver).
There is not enough to leave to large rosin deposits on the PCB, making the clean up after the re-work much more manageable. The type solder used is often referred to as Eutectic. Eutectic solder is made up of 63 % tin and 37% lead and has lower melting temperature (183 degrees Celsius). Figure 10: 63/37 Eutectic No Clean Solder 2d-Alcohol and Cotton Swabs Isopropyl alcohol is used to clean the rosin and dirt off of PCBs.