用于压紧铜瓦抱住电极，能确保电极与每块铜瓦压力一样，铜瓦不易打弧，可大大提高铜瓦使用寿命，没有轴向力，电极铜瓦不易变形。主要有波纹管式和液压油缸式两种。
For pressing the brasses tightly braking the electrode, even pressure force between electrode and every single brasses is assured, and the brasses won't arch, greatly improved the working life of the brasses, and there's no axial force so the electrode copper pipe won't easily be deformed. Pressure ring has two types: bellow and hydro-cylinder.
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