Brazing requires appropriate silver-base brazing alloys. Copper pipes are typically joined by soldering, brazing, compression fittings, flaring, or crimping. The equipment needed for braze welding is basically identical to the equipment used in brazing. This soldering / brazing operation can use a propane torch heat source. The sheets were soldered using silver solder or some other brazing alloy. All the elements usually brazed together using controllable atmosphere brazing process. Another difference between brazing and soldering is how the solder is applied. Once the soldering, brazing or welding is complete, the fuel tank is leak-tested. This sort of torch can also be used for soldering and brazing. The strips are joined together throughout their length by riveting, brazing or welding. Lithium chloride is used as a brazing alloy for aluminium parts. In some cases, especially for vacuum brazing, high-purity metals and alloys are used. Dissolution of base metals can cause detrimental changes in the brazing alloy. For instance, Induction is used for brazing carbide to shaft. Advances in gasket and brazing technology have made the plate-type heat exchanger increasingly practical.