- 學位論文
超高頻感應加熱應用於鋼鐵線材接合上之研究
Jointing of steel wire by ultra-high frequency induction heating
摘要
超高頻感應加熱的特點為加熱速率快、處理時間短，且能有效地加熱微小工件，故適合應用在微小工件的接合上。因此本研究將利用超高頻感應加熱來進行各種線材的接合。實驗主要分成兩部份：(1) 利用感應加熱來進行202不銹鋼線材、極低碳鋼線材、鋼琴線材之同材熔接；(2) 以純銅為焊料，無添加助焊劑，利用感應加熱來進行202不銹鋼線材/極低碳鋼線材、202不銹鋼線材/304不銹鋼線材之異材硬焊。上述實驗除了確定其可行性外，也探討加熱時間、溫度等處理參數對接合處的機械性質及顯微組織的影響。本研究所得之結果如下： 1. 202不銹鋼線材以超高頻感應加熱進行熔接後，接合處的顯微組織為沃斯田鐵和肥粒鐵。當加熱溫度或加熱時間增加時，肥粒鐵的含量也會增加；而就抗拉強度而言，在加熱溫度較高時，接合處的抗拉強度較佳。 2. 極低碳鋼線材以超高頻感應加熱進行熔接後，接合處的顯微組織為肥粒鐵和波來鐵。而就抗拉強度而言，本研究所熔接的工件，其接合點的強度都高於極低碳鋼線母材的強度。 3. 鋼琴線材以超高頻感應加熱進行熔接並施以高溫回火後，接合處的顯微組織主要為回火麻田散鐵。而就抗拉強度而言，在本實驗的熔接與回火條件下，工件接合處的強度高於其他部位。 4. 以純銅為焊料，以超高頻感應加熱硬焊202不銹鋼線材與極低碳鋼線材，在加熱溫度950℃及持溫時間10秒時，其接合處的強度最佳，且高於極低碳鋼線母材的強度。 5. 以純銅為焊料，以超高頻感應加熱硬焊202不銹鋼線材與304不銹鋼線材，在一定溫度下，持溫時間較長時，接合處的強度較佳；而加熱溫度太高時，接合處中心會有熔接之現象發生，而使接合處的強度大幅升高。
並列摘要
The ultra-high-frequency induction heating characterized as its high heating rate, short treating time, and effective heating on miniature tools. The joining stainless steel wire and carbon steel wire by ultra-high frequency induction heating has been studied in the article. The experiment in this study is divided into two parts: (1) Induction welding： 1. 202 stainless steel 2. extremely low carbon steel 3. piano wire (2) Induction brazing with Cu filler metal： 1. 202 stainless steel / extremely low carbon steel 2. 202 stainless steel / 304 stainless steel The effects of different parameters on the mechanical properties/microstructures of the joint parts were investigated for evaluation of the feasibility. The results of the study are shown as follows: 1. The microstructures of the joint for 202 stainless steel wire after induction welding were austenite and ferrite. Moreover, when heating temperature or heating time increased, ferrite also increased. The tensile strength of the joint was superior with higher heating temperature. 2. The microstructures of the joint for extremely low carbon steel wire after induction welding were pearlite and ferrite. Moreover, The tensile strength of the jointed part was higher than the tensile strenth in the matrix of extremely low carbon steel wire. 3. The microstructure of the joint for piano wire after induction welding and high temperature tempering was tempered martensite. Moreover, The tensile strength of the jointed part was higher than the others parts of the workpiece. 4. The tensile strength of the jointed part of brazing 202 stainless steel wire and extremely low carbon steel wire with Cu filler metal was best at 950℃ for 10 seconds, higher than the tensile strength in the matrix of extremely low carbon steel wire. 5. The tensile strength of the jointed part of brazing 202 and 304 stainless steel wire with Cu filler metal by induction heating would be higher under fixed temperature for longer time. Moreover, when heating temperature was higher, there would be welding at the center of the joint, and increasing the strength of the joint significantly.