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COMPARISON BETWEEN THE REHABILITATION OF SINGLE AND MULTIPLE ROWS FILLET WELDED JOINTS IN ORDER TO INCREASE THE FATIGUE LIFE TIME
Abstract
Variable stresses where the load value varies between a maximum and a minimum value, or varies the position in time, cause after accumulating a large number of load cycles in those structures, the fatigue failure. Fatigue is characterized by failure on values of the applied stress from the load cycles, below the material yield, values which in case of static stress would not have caused problems. Knowing that the variable stressed structures are sensitive to stress concentrators, the paper aims is to highlight the influence of the two rehabilitation techniques techniques ? weld toe grinding? and ?WIG remelting weld toe? in order to reduce the stress concentrators. The rehabilitation techniques ? weld toe grinding? and ?WIG remelting weld toe?, will increase the radius conection between filler and base material and will have a good influence on the behavior of variable tensile test of cruciform fillet welded specimen. In the paper, fatigue will be tested, durability curves will be raised using statistical methods and specialized programs, and fatigue lifetimes will be determinde by applying those two rehabilitation techniques. Also, in this paper, single and multiple rows welded joints, reinforced with additional welded rows have been chosen to study. The comparison is justified because on the one hand single rows welded joints are the most common and on the other hand the welded joints reinforced with additional welded rows are often used in the case of fatigue stressed welded structures due to the favorable heat treatment effect between the welding layers. In fact, the additional reinforcing welded layers, have a stress relief action on the adjacent layers, by proper dosing of the linear energy at welding and by a proper overlapping.
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References5
Monika O., Peter P., Milan U., Fracture mechanism differences created by fatigue and impact test, Materialstoday Proceedings, vol. 4/issue 3, pp 5921-5924, 2017
Zhao-Ling W, Heng X, Direct modeling of multi-axial fatigue failure for metals, International Journal of Solids and Structures, pp 216-231, 2017
Amza G., Babis C., Nitoi D., The influence of the specific rehabilitation techniques "toe grindig" and "wig remelting" in case of welded structure, Metalurgija, vol 53, pp 71-74, 2014
Amza, G., Nitoi D., Babis C., Amza C., Apostolescu Z., Influence of the Milling Weld Toe and WIG Remelting Reconditioning Technology to Welded Pieces in the Case of Fatigue Testing, Advanced Materials Research, vol 684, pp 362-366, 2013
Armando L., Rama I., José A., Carlos A., Branco G., Fatigue behaviour of T welded joints rehabilitated by tungsten inert gas and plasma dressin, Materials and Design, vol 32, pp 4705-4713, 2011
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