本研究是利用Nd:YAG雷射對2205雙相不銹鋼進行銲接,探討雷射銲接參數對銲件之抗拉強度及銲道凹陷量之品質特性,並建立單一及多重目標品質之參數最佳化模式。研究流程可分成實驗架構、單一及多重目標品質之參數最佳化分析等階段。首先利用田口法直交表規劃實驗配置,選用尖峰功率、脈衝頻率、脈衝寬度及銲接速度等為雷射銲接參數。以抗拉強度及銲道凹陷量作為量測目標,並藉由田口法分別選用上述之兩個雷射銲接品質進行單一目標最佳化分析,經由平均數分析及變異數分析找出對雷射銲接品質影響最重要的參數及雷射銲接參數最佳化組合。接著應用田口法及灰關聯分析,找出以抗拉強度及銲道凹陷量為多重目標品質之參數最佳化組合。結果顯示在單一目標品質參數最佳化分析中,分別得到抗拉強度為母材強度的90%及銲道凹陷量為35.77 m為最佳値。在田口法及灰關聯多重目標品質參數最佳化分析後,得知田口法及灰關聯多重目標品質參數最佳化分析和田口法單一目標品質參數最佳化分析所得參數最佳化組合結果相同,如此可確保實驗的準確性。同時可推論單一及多重目標品質參數最佳化模式均可提供雷射銲接相關研究與產業之參考及應用。
The purpose of this study is to investigate the characteristics for tensile strength and weld under-cut in laser welding 2205 duplex stainless steel by Nd:YAG, and construct the optimized models for single and multiple quality objectives. Research procedure can be divided into experimental work and analysis for single and multiple quality objectives. Firstly, an orthogonal array of Taguchi method is used to arrange experimental work. The laser welding parameters selected include peak power, impulse frequency, impulse width and welding speed. The welding qualities of tensile strength and weld under-cut are measured then, the optimum laser welding parameters for the above two single objectives of welding qualities can be found by using Taguchi method, respectively. Furthermore, combining these two welding qualities as the multiple objective to find the optimum laser welding parameters can be conducted by incorporating Taguchi method and grey relational analysis. The results of analysis show that the tensile strength is 90% of the raw material, and weld under-cut is 35.77 m in the single objective analysis by using Taguchi method, respectively. After analysis of Taguchi method and the orthogonal array of grey relational, the optimum parameters analysis of the multiple quality objective with the single quality objective analysis by using Taguchi method, get the same of parameters. As a result, the accuracy of the experiments is proved. Furthermore, either optimized parameters models for single or multiple quality objective is good enough for the relational research in laser cutting and could be used for practical applications in related industry.