Abstract
This study investigates the influence of friction pressure at a given burn-off length on the microhardness, tensile properties and microstructure of the welded joints from steel 32-2-Mn and 40-Cr-Ni. Phase transformations occurring in the materials to be welded as a result of thermal deformation effects are analyzed. The change in the length of the thermomechanical affected zone (TMAZ) depending on the friction pressure is shown. The results of the distribution of microhardness in the weld, clearly illustrating the formation of hardened and weakened areas. The results of tensile tests of welded joints are given. Analyzed the place of fracture at various welding parameters. The necessity of studying the distribution of internal residual stresses to explain the mechanism of fracture of welded joints is shown.
Highlights
The increased interest in the process of friction welding is associated with the wide spreading of this technology at the enterprises of mechanical engineering due to the technological advantages of this method and the high quality of the welded joints of the similar and dissimilar materials
The various process parameters taken into consideration here are: friction pressure, upset pressure, burn-off length and rotational speed
With the implementation of rotary friction welding on an automatic welding machine with increasing friction pressure, a predetermined deformation, characterized by burn-off length, is achieved faster, the process is reduced and the heat does not have time to spread to vast areas of the metal
Summary
The increased interest in the process of friction welding is associated with the wide spreading of this technology at the enterprises of mechanical engineering due to the technological advantages of this method and the high quality of the welded joints of the similar and dissimilar materials. Detailed studies of welded joints from medium-carbon alloyed steels in modern publications are presented very little. Their widespread use for the production of drill pipes with welded locking parts dictate the need for research in this direction to improve the quality and enhance the functional properties of the welded joint, as one of the most vulnerable points in the structures. The various process parameters taken into consideration here are: friction pressure (pressure required to generate the required heat for welding), upset pressure (the axial pressure applied on the stationary work piece once rotation of the spindle is stopped), burn-off length (loss of overall length after welding) and rotational speed (the speed at which the spindle is rotated).
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