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 article, the microstructure and mechanical properties of alloy C-276 fabricated by continuous and pulsed current gas tungsten arc welding process and by employing ER2553 filler wire were investigated.
Abstract: The present work investigates the microstructure and mechanical properties of alloy C-276 fabricated by continuous and pulsed current gas tungsten arc welding process and by employing ER2553 filler wire. Optical and scanning electron microscopic analyses were carried out to study the microstructures of weldments produced. Energy dispersive X-ray spectroscopy (EDS) was performed to investigate the formation of secondary phases in the weldments. The results disclosed that pulsed current gas tungsten arc welding showed refined microstructure compared to continuous current gas tungsten arc welding. SEM/EDS analysis revealed the segregation of Mo in the weld interface regions in both the welding techniques. The extent of microsegregation reduced the strength and toughness of the weld joint compared to the base metal. Bend test revealed cracks in the weld interface region in both the weldments.
18 citations
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TL;DR: In this paper, the authors describe welding of the sheets with different thickness values and then characterizing the mechanical and micro-structural properties for two different types of welding, i.e. GMAW and SMAW.
Abstract: This work describes welding of the sheets with different thickness values and then characterizing the mechanical and microstructural properties for two different types of welding i.e. GMAW and SMAW...
18 citations
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TL;DR: In this paper, the welding parameters, consumable types, the heat input of the joining process, preheating and interpass temperatures of pipe steel X80 are discussed in detail.
Abstract: Nowadays already a lot of large onshore-projects have been implemented for the steel X80 with, as it seems, fully satisfactory results. The high grade pipeline-steel X80 is discussed in detail in this paper as well as the various projects performed with X80. A lot of money is spent worldwide in finding the right joining process for the circumferential welds of these pipes, and so a worldwide central collection of welding variables and efficient processing could result in a prediction of the mechanical properties and fracture mechanical values out of the data of the preceding joining process, and would save a lot of trial and error and therefore costs. This paper deals with the welding parameters, the consumable types, the heat input of the joining process, preheating and interpass temperatures. The tested materials were the base material, the weld metal, and the heat-affected zone of welds, using different welding processes, as for example manual metal arc welding, gas metal arc welding, gas tungsten arc welding, or submerged arc welding, of the pipeline steel X80 according to API 5L (L 555MB according to OENORM EN 10208–2).
18 citations
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TL;DR: In this paper, two types of welded joints were prepared using low alloy carbon steel and austenitic stainless steel as base materials In one variety, buttering material and weld metal were Inconel 82 In another type, buttered-welded and buttered -stress relieved -welding specimens Adjacent to fusion boundary, heat-affected zone of low alloy steel consisted of ferrite-pearlite phase combination Immediately after fusion boundary in low alloy side, there was increase in matrix grain size.
Abstract: Two types of welded joints were prepared using low alloy carbon steel and austenitic stainless steel as base materials In one variety, buttering material and weld metal were Inconel 82 In another type, buttering material and weld metal were Inconel 182 In case of Inconel 82, method of welding was GTAW For Inconel 182, welding was done by SMAW technique For one set of each joints after buttering, stress relief annealing was done at ~923 K (650 °C) for 90 minutes before further joining with weld metal Microstructural investigation and sub-size in situ tensile testing in scanning electron microscope were carried out for buttered–welded and buttered–stress relieved–welded specimens Adjacent to fusion boundary, heat-affected zone of low alloy steel consisted of ferrite–pearlite phase combination Immediately after fusion boundary in low alloy steel side, there was increase in matrix grain size Same trend was observed in the region of austenitic stainless steel that was close to fusion boundary between weld metal-stainless steel Close to interface between low alloy steel-buttering material, the region contained martensite, Type-I boundary and Type-II boundary Peak hardness was obtained close to fusion boundary between low alloy steel and buttering material In this respect, a minimum hardness was observed within buttering material The peak hardness was shifted toward buttering material after stress relief annealing During tensile testing no deformation occurred within low alloy steel and failure was completely through buttering material Crack initiated near fusion boundary between low alloy steel-buttering material for welded specimens and the same shifted away from fusion boundary for stress relieved annealed specimens This observation was at par with the characteristics of microhardness profile In as welded condition, joints fabricated with Inconel 82 exhibited superior bond strength than the weld produced with Inconel 182 Stress relief annealing reduced the strength of transition joints and the reduction was maximum for specimen welded with Inconel 82
18 citations