This differentiates it from welding since in welding the excessive temperatures melt the bottom metals. The joint is created when the molten filler steel solidifies as it cools to make the joint between similar or dissimilar CNC machining metals. The brazing process can be undertaken in varied atmospheres including nitrogen, ammonia, hydrogen, inorganic vapours, noble gases, and vacuum. A variety of heating sources can be utilized such as furnaces or torches. A good brazed joint is shaped when each the filler and the parent metals have metallurgical compatibility. There ought to be a niche within the joint design into which the molten filler can be drawn by capillary motion.