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When an aluminum rivet is upset against a softer material, a washer must be used under the upset head to prevent eruption of the softer material. 儅一個鋁鉚釘的鐓頭形成在較軟的材料一邊時，必需在鉚釘鐓頭下使用墊片以防止較軟材料脹裂。