Topic
Butt welding
About: Butt welding is a research topic. Over the lifetime, 7153 publications have been published within this topic receiving 44467 citations.
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TL;DR: In this paper, the normal component of the self-magnetic-leakage field (Hp(y)) field values were measured and three characteristic parameters were calculated to predict failures with early warnings.
Abstract: Metal magnetic memory (MMM) method is a non-destructive testing method based on the analysis of self-magnetic-leakage field (SMLF) distribution on components’ surfaces. The MMM method can determine stress concentration zones, imperfections, and heterogeneity in the microstructure of the material and in welded joints. In order to study the magnetization of defective and non-defective butt welded Q345 steel specimens under tensile and bending loads, the normal component of the SMLF (Hp(y)) field values were measured. The results demonstrate that Hp(y) field values and gradients are effective in capturing different stress states under tensile and bending loads. The distribution of Hp(y) field values for flexural tests are quite different from that of tensile tests. The gradient values can be used to determine the degree of stress concentration. In addition, three characteristic parameters were calculated. All three parameters can predict failures with early warnings. Specifically, whether the specimen is in tensile stress state or in compressive stress state can be distinguished by the average value of Hp(y) field area. The quality of the butt weld can be judged by the magnetic index (m). The judging criteria can be a significant complement to the inspection of welded joints using MMM method. Further research could help to validate the judging criteria and analyse the factors affecting the accuracy of the predictions.
22 citations
01 Jan 2015
TL;DR: In this paper, a finite element analysis of residual stresses in butt welding of two similar carbon steel plates is performed with the ANSYS software, which includes a model for the thermal and mechanical welding simulation.
Abstract: In this paper, Manual Metal Arc Welding of carbon steel plates was studied. The finite element analysis of residual stresses in butt welding of two similar plates is performed with the ANSYS software. This analysis includes a finite element model for the thermal and mechanical welding simulation. It also includes a moving heat source, material deposit, temperature dependent material properties, metal plasticity and elasticity, transient heat transfer and mechanical analysis. The welding simulation was considered as a sequential coupled thermo-mechanical analysis and the element birth and death technique was employed for the simulation of filler metal deposition. The residual stress distribution and magnitude in the axial direction is to be obtained. A good agreement between the computation and experimental results is to be obtained.
22 citations
TL;DR: In this article, the residual stresses in butt welds were estimated using an elasto-plastic nonlinear finite element model and the temperature distribution was calculated using adaptive grid techniques.
22 citations
Patent•
16 Nov 1995
TL;DR: In this article, a device for butt welding pipes of thermoplastic plastic includes two pipe clamping units, aligned flush relative to each other, for clamping pipe ends therein.
Abstract: A device for butt welding pipes of thermoplastic plastic includes two pipe clamping units, aligned flush relative to each other, for clamping pipe ends therein. A first of the two units can be moved in the alignment direction by an electric motor and via mechanical drive elements. The reaction force corresponding to the infeed force is supported on the bottom via a support structure and a pipe end held in the second of the two units which is fixed in relation to the bottom. The mobile pipe end, held in the first pipe clamping unit, can be pressed against the fixed pipe end which is clamped in the second pipe clamping unit with a force measurable by a measurement device. In order to maintain a predetermined pressure course with greater precision and which is independent of changing environment conditions, the torque of the electric motor can be regulated in a closed control circuit as a function of the measurement values of a force, pressure, or torque measuring device which is disposed on a mechanical drive element of the mobile pipe clamping unit and, in fact, preferably on the drive element connected directly in front of this.
22 citations
TL;DR: In this article, a computational fluid dynamics (CFD) model was developed to numerically analyse the temperature and fluid flow during laser butt welding, and a heat source model was proposed, which, with adjustment, was suitable for both partial and full penetration welds over a wide range of conditions.
22 citations