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Title: 不銹鋼薄板雷射點銲特性研究
Study on Characteristics of Laser Spot Welding for Stainless Steel Sheet
Authors: 林冠翰
Lin, Kuan-Han
Contributors: 機電工程系(所)
Keywords: 不銹鋼薄板
Stainless steel sheet
Spot welding
Shear strength
Shear load
Date: 2017-06-29
Issue Date: 2017-06-29 16:17:07 (UTC+8)
Abstract: 本研究是利用Nd:YAG雷射對AISI 304不銹鋼不同薄板厚度組合以搭接方式進行點銲,以探討雷射點銲條件對銲後的抗剪強度、以及銲點表面與接合面直徑的影響特性,並找出最適化參數。首先藉由改變點銲電流及脈衝寬度兩項參數,來分析其雷射點銲銲點形狀之影響,並且找出對應最大抗剪強度之最適化參數組合。另外,透過不同板厚組合及焦點位置,探討探討電流及脈衝寬度對雷射點銲銲點形狀之影響,並透過拉伸試驗,以驗證銲點接合面積對應其最大抗剪負載有呈正比趨勢。而從其結果顯示,在板厚組合(1.0mm/1.5mm)雷射點銲之最適化接合面直徑(d1)為0.85 mm時,可獲得最大抗剪負載為1,796 N,且其最大抗剪負載會隨著銲點接合面積的增加而增加。此外,透過焦點位置效應實驗發現,當焦點位置離開第一層試片表面時,最適化銲點表面直徑(d2)就會增加,且焦點位置效應有助於增加最適化銲點表面直徑(d2),然對最適化銲點接合面直徑(d1)增加,則沒有顯著的效用。最後本研究於雷射點銲條件下,探討其對銲後的抗剪強度、以及最適化銲點表面(d2)與接合面直徑(d1)的影響特性,以提供雷射點銲加工相關產業之應用與參考。
Spot welding of AISI 304 stainless steel with different thick plates was carried out by Nd: YAG laser, which was discussed and found the most appropriate parameters for the shear strength of spot welding, the influence of welding surface and the bonding area after laser welding in this study. Firstly, current and pulse width were changed to analyze the impact of the welding spot shape, and find the corresponding maximum shear strength under the mostly appropriate combination parameters. In addition, the influence of the current and pulse width on the welding spot was discussed through the different combination of thick plates and focal position. The maximum shear load is directly proportional to the bonding area of the welding spot by the tensile test. The results show that the maximum shear load is 1,796 N at 0.85 mm of the optimum joint width under 1.0 mm/1.5 mm of the plate thickness combination. The shear load increases with the bonding area. Through the experimental results of focus position, it was found that the surface width of the solder joint increase when the focal point leaves the surface of the first layer workpiece. However, it is insignificant effect for the focal position contributes to increase the bonding area of the solder joint. Finally, the shear strength of butt welding and the influence of the solder joint surface, as well as the bonding area under the conditions of laser spot welding are discussed in order to provide the application and reference of related industries in laser spot welding.
Appears in Collections:[機電工程系(所)] 學位論文

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