臺灣博碩士論文加值系統

本研究係利用MSC.MARC軟體，模擬分析J型槽銲進行氣體金屬極電弧銲接(Gas Metal Arc Welding, GMAW)過程，因銲接熱傳導造成鋼鈑末端偏移、翹曲、及銲道處的殘餘應力與變形量。模擬銲接材料為10mm厚的低碳鋼鈑，模擬J型槽銲鈑件及銲接參數，則參考AWS之試件規範建模，銲接熱源則採用高斯雙橢球熱源。本文針對四項不同的銲接影響因素，進行J型槽銲的GMAW實驗模擬分析，並觀察分析其溫度場、鈑末端偏移量和殘留應力與應變的變化。第一項是針對三種不同銲道形貌的J型槽銲做模擬實驗分析。第二項是針對不同的散熱係數(50~250W/m2K)進行模擬實驗分析。第三項是針對不同的銲接有效吸收率(0.4~0.8)進行模擬實驗分析。第四項是針對四種不同順序的銲道進行模擬實驗分析。由本文各種模擬實驗，分析其鋼鈑末端偏移量、翹曲程度、銲縫處的殘餘應力及變形量等數據所得結果，可預測實際J型槽銲進行GMAW銲接時，其鋼鈑末端的偏移量、翹曲以及銲道之殘餘應力、變形量等。

In this study, MSC.MARC software was used to perform simulation analyses on J -groove during gas metal arc welding (GMAW) process which can cause deviation at steel plate end, warping, and residual stress and distortion of welding bead due to welding heat conduction. The simulated welding material used was a 10mm thick low-carbon steel plate, The simulated J-groove models were referred to AWS specimen-specific and GWAW parameters, and Gaussian double ellipsoid heat source was adopted as the welding heat source. Based on four different welding influencing factors, experimental GMAW simulation analyses were done on J-groove by this paper, and its temperature field, deviation amount at steel plate end, and the changes in residual stress and strain were observed and analyzed. The first experimental simulation analyses were done on three different welding bead appearances of J-groove. The second experimental simulation analyses were done on different heat dissipation coefficients (50~250W/m2K). The third experimental simulation analyses were done on the effective welding absorption rates (0.4~0.8) of different welding methods. The fourth experimental simulation analyses were done on four different orders of welding beads. From different simulation experiments done by this paper, the data obtained from deviation amount at steel plate end, warping extent, residual stress and distortion amount of welding seam, etc. can be used to predict the actual deviation amount at steel plate end, warping, residual stress of welding bead and distortion amount, etc. while performing J-groove welding with GMAW.

目 錄
摘 要 i
ABSTRACT ii
致 謝 iii
目 錄 iv
表目錄 v
圖目錄 vi
符號說明 vii
第一章 緒論 1
1.1 前言 1
1.2 研究動機 4
1.3 研究流程 7
1.4 文獻回顧 9
1.5 組織章節 11
第二章 理論與研究方法 12
2.1 數值理論 12
2.1.1 Surface Evolver理論 12
2.1.2 銲接熱源理論 13
2.1.3 銲接熱固耦合分析理論 14
2.1.4 銲接的熱彈塑性基礎分析理論 15
2.1.5 熱傳的分析理論 15
2.1.6 溫度場的分析理論 16
2.2 數值MARC分析 18
2.2.1 建立銲接試件 18
2.2.2 設定邊界條件 23
2.2.3 設定網格、材質之熱物理性質 23
第三章 不同銲接因素對GMAW銲接應力與應變影響 26
3.1 不同銲道形貌對應變和變形量的影響 26
3.2 不同散熱係數對變形量的影響 34
3.3 不同銲接吸收率對溫度與變形量的影響 40
3.4 四種銲接順序對銲接應力與變形量的影響 47
第四章 結論與建議 56
4.1 結論 56
4.2 建議 57
參考文獻 58

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