Scholarly record
METHODS OF IMPROVING THE QUALITY OF THE WELDING DEPOSIT BY USING A -SACRIFICE LAYER"
Abstract
The paper presents and analyzes the experimental results obtained by the welding reconditioning of a pressure vessel made of 14CrMoV4, a Romanian trade of steel, which is the equivalent of 13CrMo4-5, in the European norm 10028-2/2009, steel, which functioned for a long period of time in the energetic industry. The welding process used for reconditioning is robotized gas metal arc welding (GMAW). A series of samples were realized using different technological parameters in order to obtain different geometrical configurations of the welded beads and to establish the optimum reconditioning technology that can be applied industrially with a high rate of repeatability. The filler material was selected taking into account a series of criteria, such as chemical compatibility, mechanical compatibility, etc. The proposed method consists in applying a sacrifice layer over the last deposited layer in the reconditioned area. Qualitative and quantitative comparisons are made between the results obtained after changing the technological parameters used to deposit the sacrifice layer, regarding the extent of the Heat Affected Zone (HAZ), hardness and geometrical characteristics of the obtained deposit. Through the analysis method it is aimed to avoid the post reconditioning heat treatment imposed by the welding reconditioning technologies.
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References10
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