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.
当一个铝铆钉的镦头形成在较软的材料一边时，必需在铆钉镦头下使用垫片以防止较软材料胀裂。
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.
当一个铝铆钉的镦头形成在较软的材料一边时，必需在铆钉镦头下使用垫片以防止较软材料胀裂。
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