Nd: YAG雷射對Ti-6Al-4V薄板接合機械性質之研究
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2009
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本論文利用脈衝式Nd: YAG雷射對Ti-6Al-4V鈦合金1mm薄板進行雷射銲接，不加填料進行對接，銲前必須清除試片上氧化物，避免雷射反彈而無法銲接，也可避免產生化合物於銲道中，而產生氣孔。以單道雷射銲接與雙面雷射銲接為主要銲接方式，過程中以惰性氣體氬氣為保護氣體，以避免鈦的高溫活性高，產生淡藍色的氧化現象，研究出以銲接功率40W以下，雙面雷射銲接為最佳銲接方式，利用脈衝式Nd: YAG雷射的波形設定、脈衝寬度、功率、頻率、峰值功率、銲接走速參數設定來研究薄板接合機械性質變化，以金相觀察、微硬度分析、拉伸試驗、SEM分析為主要目標，得到以下幾點結論。
1.使用脈衝式Nd: YAG雷射低功率對1mm薄板接合，雙面雷射銲接優於單道雷射銲接。
2.經過雷射銲接後銲道硬度大於熱影響區與母材。
3.雙面雷射銲接抗拉強度優於單道雷射銲接。
4.保護氣體可保避免鈦合金產生氧化現象。
5.波型設定為漸升波為佳。
6.低功率Nd: YAG雷射可避免鈦合金最主要的缺陷銲蝕產生。
7.經過雷射銲接後，母材可發現α相與β相，熱影響區可發現針狀麻田散體的α’-Ti、針狀α-Ti、α-Ti組織、殘留β-Ti，銲道主要發現針狀麻田散體的α’-Ti組織。
The purpose of this study pulse Nd: YAG welds Ti-6Al-4V titanium alloy 1mm sheet metal to use laser welding, does not add the filler metal and carry on butt joint, must clean oxide , prevent from laser to it rebounds to be but unable to weld, and prevent pollution from fusion zone, and produced the porosity. The single way weld and double way welds is welding method of master ,regard inert gas argon as and protect the gas in the course, in order to prevent the high-temperature activity of the titanium from being high, produce the light blue phenomenon of oxidizing, work out to weld the low power 40W, double way welds is the best method, use pulse Nd: YAG laser wave form set up, pulse width, power, frequency, peak value power, weld walk speed parameter set up to study sheet metal joint mechanical property change, observe with the micristructure, little hardness analysis, tensile test, SEM analyze for the main goal, get some following conclusions. 1. Use pulse Nd: YAG laser low power, to 1mm sheet metal joint, double way welds is superior to the single way weld . 2. After laser welding, fusion zone a hardness and greater than heat-affect zone and base metal . 3. Tensile strength of double way welds is superior to the single way weld . 4. Protect gas can prevent the alloy of titanium producing the oxidize the phenomenon 5. Wave type set up for rise wave as good gradually. 6. Low power Nd: YAG laser defect that can prevent the alloy of titanium from being main undercut. 7. After laser welding, base metal can find α phase and β phase, heat-affected zone can find the needle-like martensite α’-Ti, acicular α-Ti, α-Ti, retained β, fusion zone find the needle-like martensite α’-Ti
The purpose of this study pulse Nd: YAG welds Ti-6Al-4V titanium alloy 1mm sheet metal to use laser welding, does not add the filler metal and carry on butt joint, must clean oxide , prevent from laser to it rebounds to be but unable to weld, and prevent pollution from fusion zone, and produced the porosity. The single way weld and double way welds is welding method of master ,regard inert gas argon as and protect the gas in the course, in order to prevent the high-temperature activity of the titanium from being high, produce the light blue phenomenon of oxidizing, work out to weld the low power 40W, double way welds is the best method, use pulse Nd: YAG laser wave form set up, pulse width, power, frequency, peak value power, weld walk speed parameter set up to study sheet metal joint mechanical property change, observe with the micristructure, little hardness analysis, tensile test, SEM analyze for the main goal, get some following conclusions. 1. Use pulse Nd: YAG laser low power, to 1mm sheet metal joint, double way welds is superior to the single way weld . 2. After laser welding, fusion zone a hardness and greater than heat-affect zone and base metal . 3. Tensile strength of double way welds is superior to the single way weld . 4. Protect gas can prevent the alloy of titanium producing the oxidize the phenomenon 5. Wave type set up for rise wave as good gradually. 6. Low power Nd: YAG laser defect that can prevent the alloy of titanium from being main undercut. 7. After laser welding, base metal can find α phase and β phase, heat-affected zone can find the needle-like martensite α’-Ti, acicular α-Ti, α-Ti, retained β, fusion zone find the needle-like martensite α’-Ti
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釹-釔石榴石雷射, 鈦-6鋁-4釩, 機械性質, Nd: YAG laser, Ti-6Al-4V, Mechanical Properties