Topic
Gas metal arc welding
About: Gas metal arc welding is a research topic. Over the lifetime, 11706 publications have been published within this topic receiving 109555 citations. The topic is also known as: metal active gas welding & GMAW.
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TL;DR: In this paper, two colour pyrometry was conducted to obtain the surface temperature of weld pools, in which the weld pool was photographed by a high speed camera during arc welding.
Abstract: In this research, two colour pyrometry was conducted to obtain the surface temperature of weld pools, in which the weld pool was photographed by a high speed camera during arc welding. Two wavelengths (950 and 980 nm) of light in the infrared range were selected from the thermal radiation light emitted from the weld pool at the instant when the arc was extinguished, using an imaging spectroscope. Consequently, in gas tungsten arc welding, it was shown that the surface temperature distribution of a weld pool is affected by the sulphur content in the base metal. It is thought that this temperature distribution is determined by the balance between the driving forces of viscous drag from the cathode jet of plasma and Marangoni surface tension. In gas metal arc welding, it was seen that the surface temperature distribution becomes uniform and the temperature is 1715–1845 K, which is obviously lower than that of the metal droplet.
34 citations
TL;DR: In this paper, the external magnetic field is exerted to control the fluid flow and its velocity distribution inside the weld pool to suppress the humping bead in high speed gas metal arc welding.
Abstract: In high speed gas metal arc welding, the higher momentum of backward flowing molten jet in a weld pool contributes to the occurrence of humping bead. In this study, the external magnetic field is exerted to control the fluid flow and its velocity distribution inside the weld pool to suppress the humping bead. The effects of the external magnetic field on the weld pool flow dynamics, arc column and the metal transfer are experimentally investigated. The required excitation current levels to suppress humping bead under different welding conditions are obtained. It is found that the deflection of arc column and liquid metal stream at wire tip can be offset by a suitable backward inclination angle of torch. With appropriate combination of external magnetic flux density and backward inclination angle of torch, a good quality weld bead without humping and spatter can be obtained in high speed GMAW.
34 citations
TL;DR: In this paper, a numerical model of the heat transfer during autogenous arc welding was used to estimate the net heat exchange between a weldment surface and a point infrared detector as a function of sensor position about the welding arc.
34 citations
TL;DR: In this paper, a feature recognition module is proposed to identify the critical features of the part, such as free end walls, t-crossings, direct crossings and isolated tubulars, with the aim of minimizing the geometrical errors and to ensure the required machining allowances for the subsequent finishing operations.
Abstract: WAAM (Wire-Arc-Additive-Manufacturing) is a metal additive manufacturing process using arc welding to create large components with high deposition rate. The workpiece quality and the process productivity are strongly dependent both on the process parameters (wire feed speed, voltage and current) and on the selected deposition path. Currently, the CAM (Computer-Aided-Manufacturing) software dedicated to WAAM rely on a multi-pass strategy to create the component layers, i.e. each layer is built overlapping multiple welding passes. However, since WAAM can create wide layers, a single pass strategy can improve the process efficiency when dealing with thin walled components. This paper proposes CAM software dedicated to WAAM, using a single pass strategy. The proposed solution uses a midsurface representation of the workpiece as input, to generate the deposition toolpath. A feature recognition module is proposed, to identify the critical features of the part, such as free end walls, t-crossings, direct-crossings and isolated tubulars. A specific strategy is developed and proposed for each one of the selected features, with the aim of minimizing the geometrical errors and to ensure the required machining allowances for the subsequent finishing operations. The effectiveness of the proposed strategy is verified manufacturing a test case.
34 citations
Patent•
14 Jul 1992TL;DR: In this article, a method of welding metal products, at least one of which being made of nickel or a nickel alloy, comprises the steps of generating an arc between the products to be welded serving as a positive pole and a tungsten electrode held by a welding torch serving as negative pole.
Abstract: A method of welding metal products, at least one of which being made of nickel or a nickel alloy, comprises the steps of generating an arc between the products to be welded serving as a positive pole and a tungsten electrode held by a welding torch serving as a negative pole, emitting a shielding gas consisting of an argon-based mixed gas containing one or both of hydrogen and helium from a confining gas nozzle concentric with the tungsten electrode, thus confining the apparent flaring angle of the arc within 80 degrees, and moving the welding torch along the weld line while feeding the tip of a filler wire to a part of the molten pool directly below the arc. This method is applicable to the welding of metal products, at least one of which is made of nickel or a nickel alloy.
34 citations