本文探討不同持溫時間在700℃於SKD11工具鋼感應硬銲被銲接碳化鎢(8Co)銲道層之顯微結構與剪切強度的影響，並找出影響剪切強度之主要關鍵，以利於SKD11工具鋼硬銲製程的依據，使用奈秒雷射加工具有高能量密度和極低熱影響區的表現，製作兩種不同類型紋理圖案(條紋狀、網格狀)於鋼材上，而後利用感應硬銲法於碳化鎢和Bag-8銀基填料(Ag:49%、Cu:16%、Zn:23%、Mn:7.5%、Ni:4.5%)及冷作模具鋼硬銲研究，實驗結果顯示，雷射表面紋理製程提高冷作模具鋼表面粗糙度值，當感應硬銲時不同持溫時間減少基材的硬度值，但改善金屬材料的銲接特性。微觀結構觀察，冷作模具鋼與銀基填料接合處中銲道合金層有微量介面反應層，當持溫時間過於短暫將造成縮孔及裂痕等明顯缺陷產生，最後在90秒持溫時間當中，條紋狀紋理圖案與原材提升25%抗剪強度。

This thesis studies on the effect of different holding time at 700℃ on microstructure morphology and shear strength of weld layer for SKD11 tool steel Brazed with Tungsten Carbide(8Co). In addition, the major factors that influence shear strength performance of weld layer were found out in this study, as a basis of brazing SKD11 tool steel. Using nanosecond pulse laser is characterized with high energy density and trivial heat-affected-zone processing two typical texturing pattern (Stripe and Grid) on Steel materials, After the Induction brazing of Cemented Tungsten Carbide (WC-Co) and SKD11 Cold Work Tool Steel using Bag-8 silver base filler alloy has been studied. Results of experiment showed laser surface texturing process increase SKD11 tool steel surface roughness, that induction brazing different holding time decrease hardness and increase metal material joint properties. By the microstructure observation, the weld alloy layer was formed at SKD11/ Ag49Cu14Zn25Mn7.5Ni4.5 a small quantity interface, the insufficient holding time will create shrink holes and hair cracks in the brazed zone of WC-8Co/ Ag49Cu14Zn25Mn7.5Ni4.5/SKD11 joints, On ninety second holding time stripe texturing pattern mode can improve the shear strength of SKD11/Tungsten Carbide joint by 25 percent.

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