The equipment needed for braze welding is basically identical to the equipment used in brazing. "Machine torch brazing" is commonly used where a repetitive braze operation is being carried out. Amorphous boron is used as a melting point depressant in nickel-chromium braze alloys. Braze welding has many advantages over fusion welding. The plating acts as a braze alloy. There are three basic types of resistance welding bonds&colon; solid state, fusion, and reflow braze. The braze alloy joins the materials and compensates for the difference in their expansion rates. Surface finish tends to be less critical and the braze joints tend to be stronger. The company, now known as Braze, advertises that it serves 420 million mobile users.