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Arc welding
About: Arc welding is a research topic. Over the lifetime, 25393 publications have been published within this topic receiving 168182 citations.
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TL;DR: In this paper, an analytical model has been developed to provide a theoretical understanding of the influence of pulse parameters on the behaviour of metal transfer and thermal characteristics in pulsed current GMA welding using Al-Mg filler wire.
Abstract: The control of pulsed current gas metal arc (GMA) welding is highly critical owing to the simultaneous influence of the pulse parameters on thermal and metal transfer behaviours of the process. An analytical model has been developed to provide a theoretical understanding of the influence of pulse parameters on the behaviour of metal transfer and thermal characteristics in pulsed current GMA welding using Al–Mg filler wire. The variations in thermal and metal transfer behaviours with changes in pulse parameters have been satisfactorily analysed considering a summarised influence of pulse parameters defined by a dimensionless factor p = (I b/I p)ft b, proposed previously. A large number of process parameters have been considered, as a result of using four different GMA welding power sources. The hypothesis has been verified using some previously reported experimental results. The theoretical model may be useful in the control of pulse parameters to achieve desired behaviours of thermal and meta...
36 citations
TL;DR: In this article, a 1.4410 superduplex stain-less steel (SDSS) with a thickness of 6.5 mm has been welded by plasma arc welding (PAW) process with different heat inputs.
Abstract: EN 1.4410 (UNS S32750) superduplex stain- less steel (SDSS) with a thickness of 6.5 mm has been welded by plasma arc welding (PAW) process with dif- ferent heat inputs. To determine the mechanical properties, impact toughness testing at subzero temperatures starting from -20 C down to -60 C was carried out while fractographs were examined by scanning electron micros- copy (SEM). Microstructural examination included macro- and microphotographs of the cross sections, ferrite content measurements and hardness survey of the weld zones. Interpreting all data obtained, results were compared depending on the heat inputs of the joints while the relation between heat input and properties was explained. Promis- ing low temperature toughness, results were obtained while it was concluded that the variation of the heat input influ- enced mainly the ferrite content and hardness of the weld zones. Results showed that PAW, which is considered immature process in welding of SDSS, can be employed for 1.4410 superduplex grade with controlled heat input so the properties.
36 citations
Journal Article•
TL;DR: In this article, a one-dimensional model of the melting electrode was used to predict the electrode extension during gas metal arc welding, and the onset of short-circuiting as the current is decreased for a given electrode feed speed was predicted within 9%.
Abstract: The electrode extension during gas metal arc welding is predicted using a one-dimensional model of the melting electrode. Joule heating in the electrode, heat directly applied to the end of the electrode from the condensing electrons, and heat transferred from the droplet, together with conduction along the electrode are considered. The thermal conductivity, the thermal diffusivity, and the electrical resistivity of the electrode material are allowed to vary with temperature. The steady-state electrode extension is predicted to an accuracy of 1.9 mm. The onset of short-circuiting as the current is decreased for a given electrode feed speed is predicted within 9%. Dynamic analysis shows that the gas metal arc welding process acts as a low-pass filter for electrode extension with respect to the square of the current and with respect to electrode feed speed. As the mean welding current is increased, the electrode extension (or arc length is the contact-tube-to-work distance is constant) has a smaller response to perturbations in the current or electrode feed speed. The quasi-linear transfer functions between electrode extension and current squared and between electrode extension and electrode feed speed can be described by one zero, two pole parametric fits. The transfer functions are linear inmore » the amplitude of the excitation up to 10% of the mean excitation. The model transfer functions were verified with experiments.« less
36 citations
TL;DR: In this paper, the authors investigated the factors which affect the fatigue strength of the welded commercial magnesium alloy joints as welded surface, and the welding processes used in this investigation were TIG and FSW.
Abstract: Magnesium alloys have attracted special attention of researchers working in transportation industries because they are the best lightweight structural materials with a relatively high-strength to weight ratio and excellent technological properties. Enhancement of structural application of such a structural material depends on the ability of construction by welding. The welding of magnesium alloys has been investigated widely. Results indicate that FSW (friction stir welding) and TIG (tungsten inert gas arc welding) are successful welding methods for magnesium alloys and aluminum alloys. 1–4) Reliability is their salient attribute, especially for use in the transportation industry. Therefore, the clarification of fatigue properties must precede application of joining by welding. 5) This study investigated the factors which affect the fatigue strength of the welded commercial magnesium alloy joints as welded surface. Investigated alloys were extruded or rolled AZ31 and AZ61. The welding processes used in this investigation were TIG and FSW. Joint efficiencies (%)
36 citations
TL;DR: In this paper, a heat treatable aluminum-magnesium-silicon alloy and a non-heat treatable aluminiummagnesium alloy were joined and the microstructure of the fusion zone was characterized by optical microscopy.
36 citations