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COMPARISON BETWEEN THE INFLUENCE OF REHABILITATION TECHNIQUES ON STATIC AND VARIABLE LOADS, IN CASE OF CRUCIFORM FILLET WELDED JOINTS REINFORCED WITH ADDITIONAL WELDING ROWS

Claudiu Babiş

Abstract

Rehabilitation techniques ?weld toe grinding? and ?WIG remelting weld toe? have an beneficial influence on the increase of the fatigue life of welded structures by reducing the stress concentrators at the intersection between filler and base material. This stress concentrators reduction is achieved by increasing the radius of the connection between those two elements of the welded joint, horizontal and vertical plates. From those two techniques mentioned above, the technique that causes the greatest fatigue life is " WIG remelting technique" of the top seam. This technique is very effective because by WIG remelting of the top seam it eliminates the stress concentrators from the conection between the base and filler material, and after solidifying the molten metal bath, it creates a smooth transition between them. This paper will investigate whether these reconditioning techniques influences favorably the behavior of welded structures in static and variable loads and therefore if the application of these techniques is justified in both cases. In the paper will be presented micro and macrostructures, graphics with the variation of microhardness, static and fatigue tensile tests will be performed, and it will be rised durability curve in case of fatigue tests. Also, in the paper, welded joints reinforced with additional rows have been chosen to study, because they are often used, due to the favorable heat treatment effect between the welding layers. In fact, the additional reinforcing welding rows, have a stress relief action on the adjacent layers, by proper dosing of the linear welding energy and by a proper overlapping.

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DOI resolver: doi.org/10.5593/sgem2018/6.1/s24.016

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