凝固裂紋敏感度的新型評估方法;New-type Evaluation Method for Solidification Cracking Susceptibility

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/88432

Title:	凝固裂紋敏感度的新型評估方法;New-type Evaluation Method for Solidification Cracking Susceptibility
Authors:	劉興穎;Liu, Hsing-Ying
Contributors:	機械工程學系
Keywords:	凝固裂紋;高溫延性曲線;高速攝影;脆性溫度區間;Solidification cracking;High temperature ductility curve;High-speed imaging;Brittleness temperature range (BTR)
Date:	2022-04-25
Issue Date:	2022-07-14 01:20:49 (UTC+8)
Publisher:	國立中央大學
Abstract:	凝固裂紋是焊接過程中的一個重要指標，當熔池尾部的高溫局部應變在焊接過程中，超過其凝固溫度範圍內的焊縫金屬的延性時，此時凝固裂紋便會發生。因此為了準確預測和防止凝固裂紋發生，需要對其凝固溫度範圍內的高溫延性曲線進行定量分析，以便得到高溫延性曲線。凝固裂紋是一種涉及材料和力學因素的複雜行為。如果我們想要有更精確的觀察與預測，就必須使用高速相機或其他異於傳統評估方式以進行預測與評估。在本研究中，為了得到更高精度的高溫延性曲線來評估凝固裂紋，將使用新的凝固裂紋測試方法測量局部應變及使用4-sensors camera進行溫度測量。採用新的凝固裂紋測試方法搭配適當的拍攝條件，可以精確地計算局部應變。結合溫度測量及應變結果，可以得到更高精度的高溫延性曲線來預測凝固裂紋。根據上述實驗的結果，可以更準確地判斷凝固裂紋的預測及其極限。 ;Solidification cracking is an important index during welding and it occurs when a high-temperature strain at a molten pool tail exceeds the ductility of weld metal within its solidification temperature range during welding. Therefore, in order to accurately predict and prevent the solidification cracking, it is required to quantitively analyze the high-temperature ductility curve within its solidification temperature range and obtain the high-temperature ductility curves. Solidification cracking is a complicated behavior involved both material and mechanics factors. If we want to have more precise observation, using high speed camera or something different from traditional way must be carried out. In this research, in order to get more higher-precision high temperature ductility curve to evaluate solidification cracking, new solidification cracking test method and temperature measurement which measured by 4-sensors camera will be carried on. With new solidification cracking test method and optimal shooting conditions, the local strain can be precisely calculated. Combined with temperature measurement result, higher-precision high temperature ductility curve can be gotten to predict the solidification cracking. Based on the results obtained from the mentioned experiments, the prediction of solidification cracking and their limits can be more accurately judged.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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