Topic
Shielded metal arc welding
About: Shielded metal arc welding is a research topic. Over the lifetime, 4462 publications have been published within this topic receiving 40560 citations. The topic is also known as: manual metal arc welding & flux shielded arc welding.
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TL;DR: In this paper, a low-power laser/arc hybrid welding process of magnesium alloy with filler metal is studied to resolve the problem of welding defects and reduce the mechanical properties of weld joint.
Abstract: In the welding process of magnesium alloy, evaporative loss of alloying elements will induce welding defects and reduce the mechanical properties of weld joint In this article, low-power laser/arc hybrid welding process of magnesium alloy with filler metal is studied to resolve this problem Under the optimal welding parameters, weld joint with good formation and high quality can be obtained The feeding modes of filler wire and the effects of welding parameters on weld joint are studied The grain size of fusion zone and heat-affected zone (HAZ) become uniform, and the tensile strength of welding joint reaches about 95% of base metal Besides, the arc plasma behaviors and plasma spectra are investigated, and the results show that the arc plasma expands and the electron temperature of arc plasma decreases, but the electric conducting route concentrates and the energy density of arc plasma enhances, which improves the welding penetration significantly
14 citations
Patent•
11 May 1998
TL;DR: In this article, the authors proposed a welding joint structure which is capable of forming weld metal high in toughness without lowering welding efficiency and which enables such corrosion resistance of a weld zone to be obtained as is comparable to that of a basic material, and to improve reliability of the weld zone through the reduction of danger against brittle fracture.
Abstract: PROBLEM TO BE SOLVED: To provide a weld joint structure which is capable of forming weld metal high in toughness without lowering welding efficiency and which enables such corrosion resistance of a weld zone to be obtained as is comparable to that of a basic material, and to improve reliability of the weld zone through the reduction of danger against brittle fracture, in the welding of a high Cr ferritic heat resistant steel containing 8.5-13 wt.% Cr. SOLUTION: The initial layer is constructed by TIG welding using a welding material having the same component base as that of a high Cr ferritic heat resistant steel; and, the next and subsequent layers are constructed by at least one welding method selected from shielded metal arc welding, submerged arc welding, inert gas metal arc welding, and CO 2 gas shielded arc welding, using a high strength welding material which contains 1.9-2.6 wt.% Cr, with W added for a prescribed quantity. Otherwise, after the initial layer 2 and the subsequent layers are successively welded, the last layer is laminated with weld metal using a welding material which has the same component base as that of the base material containing 8.5-13% Cr. COPYRIGHT: (C)1999,JPO
14 citations
Patent•
17 Jun 2010
TL;DR: In this paper, a hybrid laser arc welding head was used to weld a tub of a railroad tank car, with a manipulator boom adapted to move with respect to the interior surface of the tank shell.
Abstract: A system for welding a tub of a railroad tank car includes a manipulator boom adapted to move with respect to the interior surface of the tank shell. A hybrid laser arc welding head mounted to the manipulator. A supplemental gas metal arc welding head includes dual wires of welding material and is mounted to the manipulator adjacent to the hybrid laser arc welding head. An inductive heating coil is mounted adjacent to the supplemental gas metal arc welding head. The hybrid laser arc welding head welds a seam of the railroad tank car shell with the supplemental gas metal arc welding head following to generally complete filling of a resulting weld joint with welding metal. The supplemental gas metal arc welding head is followed with the inductive heating coil to provide heat to normalize the resulting weld joint.
14 citations
TL;DR: In this article, the effects of adding different quantities of Nb (0·1, 1·03, 2·49, and 3·35 wt-%) to the flux of electrodes used in welding Inconel alloy 690 on the microstructure, mechanical properties, and corrosion behaviour of the resulting weldments were investigated.
Abstract: The present work investigates the effects of adding different quantities of Nb (0·1, 1·03, 2·49, and 3·35 wt-%) to the flux of electrodes used in welding Inconel alloy 690 on the microstructure, mechanical properties, and corrosion behaviour of the resulting weldments. Inconel filler metal I–52 coated with flux was used as the welding electrode. Weldments were butt welded using a manual shielded metal arc welding process. The experimental results indicated that the subgrain structure of the fusion zone was primarily dendritic. Niobium was depleted at the dendritic cores and enriched in the interdendritic regions. A small heat affected zone with typical coarse grains, which subsequently formed ghost grain boundaries, was present. With increasing Nb, the welds tended to show a finer subgrain structure and smaller dendritic spacing. Niobium rich segregants in the form of small particles formed in interdendritic spaces, providing the sites for microvoid formation by rupture. Correspondingly, the tensi...
14 citations