本研究重點以氬銲(GTAW)為製程，以不銹鋼SUS 309L材料為緩衝層，被覆於母材SUS 316L上，再於緩衝層上方被覆三層 In 52M，期望藉由緩衝層之銲接參數設計，改善SUS 316L母材被覆過程之機械性質，以確保安全及經濟效益。
本研究以光學顯微鏡觀察緩衝層與In 52M被覆材微觀組織，微硬度試驗進行硬度值量測，側彎進行規格試驗，肥粒鐵磁性量測及被覆層稀釋率量測，電子顯微鏡觀察被覆層熱影響區與母材間表面形貌及能量分散光譜儀分析析出物及各層化學成份等，獲至結論如下: 母材SUS 316L與緩衝層SUS 309L 被覆層界面組織為樹枝晶狀結構，熱影響區、熔融線不明顯，δ-ferrite於母材、緩衝層熔融區成長；Nb的增加促使被覆層組織由胞狀枝晶轉變為柱狀枝晶；因多次被覆之影響下被覆層硬度值較上被覆層高，硬度值最大值位於母材界面，其原因是多次熱循環後，產生再熱細晶區；由EDS中分析銲料對母材稀釋率，隨被覆層次增多時，Fe含量減少，Cr、Ni含量微增；在電子顯微鏡中發現被覆層析出物之位置主要分佈在樹枝狀結構的間隙中，量測析出物的成份為Ti、Nb、N及C等的氮化物及碳之化合物。
冀能尋求採用緩衝層在異種金屬銲接時可發揮的特性，以作為工業界使用上的參考。

The research focused on GTAW as the manufacturing process and used SUS309L stainless steel as buffer layers to clothe on SUS316L. Besides,three layers of In 52M were clad on buffer layers. Through the design of welding parameters of buffer layers, we look forward to improving the problem of mechanical properities in the process of clothing of SUS316L. To ensure safety and economic benefits.
We used the optical microscopes for the study to observe the microstructure of buffer layers and IN 52M. Vickers hardness test was used to test hardness. Standards, magnetism of ferrite, and dilution ratio of buffers were tested by side belding. In addition, electron microscopes were used to observe the appearance between base metal (BM) and the heat-affected zone (HAZ) of buffer layers. We also used the EDS to analyze separation and chemical composition of each layer. The conclusions are as follows: The interface of overlayer of SUS316L and SUS309L is dendritic structure.There is HAZ and fusion lines are not clear.δ-ferrite grows in BM and the fusion zone of buffer layers. The increase of Nb made the overlayer change from cellular to colummar dendritic. Because of the influence on many times’ welding, the hardness of lower overlayer is harder than that of upper overlayer. HAZ of BM is the hardest. From EDS’ analysis of dilution ratio of the solder and BM, Fe decreases and Cr as well as Ni increase a little as the layers of clothing increases. Moreover, we found the place of separation of overlayer mainly lies in the clearance of dendritic structure and that the composition of separation is Nitride and Carbide like Ti, Nb, N, and C.
We expect to adopt the properties of buffer layers when dissimilar
metal welding happens as the reperence of the usage of the industry.

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