用于壓緊銅瓦抱住電極，能確保電極與每塊銅瓦壓力一樣，銅瓦不易打弧，可大大提高銅瓦使用壽命，沒有軸向力，電極銅瓦不易變形。主要有波紋管式和液壓油缸式兩種。
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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