Soldering is a type of low temperature welding appropriate for connecting the pieces of lead into one continuous network. In this step of the process each intersection of lead segments receives a small joint of solder which attaches the pieces permanently. Before soldering begins, the entire surface of all the lead is rubbed with steel wool to remove any oxidation which has occurred during the process of assembly. Then a small amount of flux, a chemical cleaning agent, is brushed onto each joint. A hot soldering iron and a clean lead joint are the keys to successful soldering. Upon completion of soldering on the front side, the window is turned over and the process is repeated for the backside. When soldering is finished, all the joints should have a uniform and minimal appearance.