[{"data":1,"prerenderedAt":61},["ShallowReactive",2],{"q-106180-arch_construction-44":3},{"question":4,"neighbors":26,"sameNumber":45,"prev":34,"next":37},{"id":5,"classKey":6,"session":7,"year":8,"subject":9,"number":10,"groupStem":11,"ownStem":12,"stem":12,"options":13,"answer":18,"answerKind":20,"answerS":11,"answerNote":11,"images":21,"explanation":22,"withheld":11,"deepChars":23,"freq":24,"indexable":25},"arch-106180-801-0103-044","architect","106180",106,"建築構造與施工",44,null,"鋼骨建築結構銲接施工時，銲條須預熱烘乾之目的為何？",{"A":14,"B":15,"C":16,"D":17},"提升銲接速度","減少銲條用量","減少浪費銲條","防止銲道發生裂縫",[19],"D","single",[],"本題考點：銲條（銲材）使用前烘乾的目的——去除銲條被覆劑吸收的水分，避免水分在電弧高溫下分解出氫，進入銲道造成氫致裂縫與氣孔。\n【正解理由】被覆電銲條的外層藥皮（被覆劑）具有吸濕性，在工地存放時會從空氣中吸收水分。銲接時電弧溫度極高，水分分解成氫與氧，氫原子溶入熔融的銲道金屬；銲道冷卻、組織轉變後，氫的溶解度下降，氫原子在金屬內部聚集，形成很高的內壓，配合銲接殘留應力，就會在銲道或熱影響區產生裂縫。這類裂縫常在銲後冷卻一段時間才出現，稱為冷裂或氫致裂縫，強度愈高、板厚愈厚的鋼材愈敏感；水分也會造成氣孔與銲道表面不良。因此銲條在使用前要先行烘乾，取出後放在保溫筒中保持乾燥，目的是降低銲道中的氫含量，防止銲道發生裂縫。《建築技術規則建築構造編》第 287 條之 2 要求銲接時應配以合適之銲材，並依施工規範進行銲接施工及檢驗，銲材的乾燥管理就屬於這一環。故選 D。\n【逐項排除】\n(A) 提升銲接速度：不符合題目所問。銲接速度取決於銲接電流、銲條直徑、銲接姿勢與銲道斷面，烘乾銲條並不是為了加快施銲；而且烘乾本身需要額外的時間與保溫設備，是品質管理措施，不是提高效率的手段。\n(B) 減少銲條用量：不符合題目所問。銲條用量取決於銲道長度與銲道斷面大小（銲腳尺寸、開槽形狀），與銲條是否乾燥無關；烘乾不會改變單位長度銲道所需的熔填金屬量。\n(C) 減少浪費銲條：不符合題目所問。避免浪費屬於銲材的庫存與領用管理，不是烘乾的目的；烘乾的對象是銲條藥皮中的水分，所要處理的是銲道品質，而不是材料節省。\n(D) 防止銲道發生裂縫：符合題目所問。烘乾去除藥皮水分，降低銲道擴散氫含量，防止冷裂（氫致裂縫），並減少氣孔，是銲條烘乾的主要目的。\n【記憶點】銲條烘乾＝去水除氫＝防冷裂；母材預熱＝減緩冷卻＝也是防裂，兩者目的相同、對象不同。",599,1,true,[27,30,33,36,39,42],{"number":28,"session":7,"stem":29},41,"依建築物無障礙設施設計規範，無障礙停車位地面之表面不可使用何種材料？",{"number":31,"session":7,"stem":32},42,"橡膠止水帶在建築防水工程中的功能，下列何者錯誤？",{"number":34,"session":7,"stem":35},43,"鋼骨建築梁柱結構銲接施工時，應從何處開始銲接？",{"number":37,"session":7,"stem":38},45,"就現行法令而言，下列何種防火被覆工法無法滿足 3.6 m 樓高鋼構造建築，及其鋼梁 …",{"number":40,"session":7,"stem":41},46,"鋼骨以螺栓接合時，其螺栓群之鎖緊順序何者正確？",{"number":43,"session":7,"stem":44},47,"普通混凝土施工時，有關澆置完成表面之處理，下列敘述何者正確？",[46,49,52,55,58],{"number":10,"session":47,"stem":48},"114180","有關清水混凝土（architecture exposed concrete）之敘述，…",{"number":10,"session":50,"stem":51},"113190","張貼石材若以水泥砂漿為黏著材料，日後經雨水浸淋易產生游離石灰水滲出施工勾縫，乾燥後形…",{"number":10,"session":53,"stem":54},"112190","有關預力混凝土構材之澆灌，下列敘述何者錯誤？",{"number":10,"session":56,"stem":57},"111180","清水砌磚工法中勾縫之目的為何？①黏著 ②防水 ③美觀 ④抑制白華",{"number":10,"session":59,"stem":60},"110180","鋁門窗的性能，以 CNS 11526 門窗抗風壓性試驗法進行試驗。其抗風壓性能，允許…",1791863212672]