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Residual Stress in Pipe Joints Welded with Base and Cellulose Coated Electrode

The residual stress, that often occurs as consequence of the uneven heat distribution is common phenomenon for welded constructions. Possible consequences of residual stress are construction deformation, stress corrosion and fractures. Appearance of residual stress and deformation cannot be eliminated in total, but its intensity could be controlled by means of design and technological solutions. Thus, it is important to optimize the parameters of construction during designing phase. In this paper, a study conducted in order to find optimized technological solution for a welded pipe joint is presented. In the study, two technological solutions for the joint were compared by residual stress measuring with the “hole-drilling” method. The major difference between two technological solutions was the electrode type used during electric arc welding. Measurements were conducted on samples welded with base coated electrode and with cellulose coated electrode. According to the experts in this field, cellulose coated electrodes are more appropriate from economic and technological point of view. The purpose of this paper is the validation of cellulose coated electrode welded joints quality based on residual stress. Intensity and direction of residual stress at three measuring points of each sample were measured and compared.

Pipe joint, Residual stress, Weld Coated electrodes

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