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Sub-grain microstructure generally exists in the 316LN weld metal (WM) and the sub-grain size and morphology as well as its orientation vary. In order to analyze the effect of 316LN cast microstructure characteristics on its fracture behavior, a numerical model based on cohesive finite element method (CFEM) was presented. Based on experimental microstructure images, three kinds of morphological microstructures...
In this paper, Narrow Gap Metal Active Gas (NG-MAG) arc welding system was introduced, aiming at efficiently jointing AISI 316LN thick plate used in International Thermonuclear Experimental Reactor (ITER) device. Effect of heat input on cryogenic impact toughness of the WM was investigated and suitable welding parameters were explored to optimize the cryogenic toughness of weld metal (WM) and avoid...
The fluctuations of process parameters and groove dimensions would lead to the change of weld penetration state in the thin-walled cylinder girth weld, the penetration state was need to detect and control real-time in order to ensure stable penetration. A vision-based direct sensing method was established for thin-walled cylinder TIG weld, the clear back pool image was got, the wide range back melt...
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