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 article, a wire and arc additive manufacturing (WAAM) system is proposed, which integrates a cold metal transfer (CMT) welding equipment and a CNC milling machine with three axis.
56 citations
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TL;DR: In this article, Nitrogen loss from laser welding melts pools and can have a deleterious effect on weld toughness for duplex stainless steels This effect can be alleviated by using nitrogen as the shielding gas during laser welding.
56 citations
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TL;DR: In this paper, an analysis of the arc energy influence on the weld bead geometry allows determining the mechanisms that occur during ATIG welding with fluorides, and it seems that fluoride activating effect could depend on the fluoride lattice energy and/or the ionic radius of the element.
Abstract: The mechanisms of the inorganic powders, named activating flux and used in ATIG welding process, are not well identified. Oxides and fluorides usually compose activating fluxes. The present paper studies the fluoride activating effect. The analysis of the arc energy influence on the weld bead geometry allows determining the mechanisms that occur during ATIG welding with fluorides. It seems that fluoride activating effect could depends on the fluoride lattice energy and/or the ionic radius of the element. Fluorides act on the arc physics only. An arc energy densification is observed. Furthermore, an arc temperature increase, find out with optical emission spectrometry, characterises the fluoride activating effect. The fluorides do not affect the weld bead surface chemistry. Marangoni convection movements stay centrifugal as in TIG welding and do not favour a penetration increase.
56 citations
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TL;DR: In this paper, the capability of the hybrid laser-arc welding in comparison with lone laser welding for AA2198 aluminum alloy was compared experimentally. But the results indicated that conduction mode occurred and keyhole was not formed even in low welding speeds and thus the penetration depth was so low.
56 citations
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TL;DR: In this article, the laser beam was focused near the leading edge of the weld pool and the laser power and focus spot size were varied to determine the values required to confine the cathode spot to the laser focus position.
Abstract: Cathode spot formation is very pronounced during arc welding of titanium and titanium alloys. The dynamic behaviour of these spots was observed to interfere with metal transfer during welding, this interference being a fundamental cause of poor weld quality in these alloys. In the present work, stabilisation of the arc cathode spot with a focused Nd–YAG laser beam during pulsed gas metal arc welding of titanium was investigated. The laser beam was focused near the leading edge of the weld pool and the laser power and focus spot size were varied to determine the values required to confine the cathode spot to the laser focus position. The results showed that, for fixed welding conditions, the laser power required to prevent cathode spot motion varied as a function of focus spot size. The required laser power was minimised at 200 W for a spot size of 0.6 mm. The laser stabilised arcs had lower voltage but approximately the same current density as stabilised arcs. Increased welding speeds required mar...
56 citations