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.
