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: Friction stir welding of AA7075-T651 plates with thicknesses of 10 and 16 mm was investigated in this paper, where defect-free, full-penetration welds were obtained after careful process parameter selection.
68 citations
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TL;DR: In this article, a comprehensive methodology for the analysis of residual stresses due to welding and quenching processes is detailed using the finite element method, where nonlinearities due to the variation of material properties and heat transfer coefficients with temperature and those due to inclusion of a radiation boundary condition and solid phase transformation effects are considered in the thermal and thermo-elasto-plastic formulations.
68 citations
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TL;DR: In this article, a passive vision sensor is added to a teaching and playback welding robot for pulsed gas tungsten arc welding, which is normally used in the welding of thin plate closed-gap butts.
Abstract: A passive vision sensor is added to a teaching and playback welding robot for pulsed gas tungsten arc welding, which is normally used in the welding of thin plate closed-gap butts. This paper presents a seam tracking method based on this sensor through period visual measurement of the offset between the torch and the seam center. A robust image processing algorithm is developed to extract the seam center. A kind of ARX(auto-regressive with exogenous input) model is studied to describe the relationship between the rectifying voltage and the offset. The fuzzy PID(proportional-integral-derivative) seam tracking controller is analyzed and designed in consideration of various offsets based on the ARX model. The experimental results on straight line weld display a good seam tracking capability of the proposed method.
66 citations
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TL;DR: In this paper, a simplified finite element simulation of the out-of-plane distortion caused by fusion butt welding is presented, which is applied to a non-linear elastic finite element model to provide predictions of the final angular and overall deformations of the butt-welded plates.
Abstract: The main aim of the work was to investigate a simplified finite element simulation of the out-of-plane distortion caused by fusion butt welding. The thermal transient part of the simulation made use of a finite element analysis of the two-dimensional cross-section of the weld joint and the thermoelastic-plastic treatment was based on analytical algorithms describing transverse and longitudinal deformations, leading to predictions of transverse angular deformation and longitudinal contraction force. These results were then applied to a non-linear elastic finite element model to provide predictions of the final angular and overall deformations of the butt-welded plates. The validity of the simulation was investigated via full-scale tests on 4m x 1.4m x 5 mm steel plates, butt welded using a flux-cored Ar-CO2 metal-inert gas process. Thermography and thermocouple arrays were used to validate the thermal transient computations and out-of-plane deformations were measured using displacement transducers for transient deformations and a laser scanning system to measure the profiles of the whole plates before and after welding. The results of six full-scale tests are given and comparison with the simulations shows that the procedure provides good prediction of the angular and overall out-of-plane deformations. Prediction accuracy requires account to be taken of initial shape, gravity loading, and support conditions.
66 citations
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TL;DR: In this article, a three-dimensional finite element (FE) simulation of dissimilar steel welding process was carried out to identify temperature fields and residual stress states in different steel butt-welded joints between carbon and stainless steels.
65 citations