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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.


Papers
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Journal ArticleDOI
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

Journal ArticleDOI
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

Journal ArticleDOI
TL;DR: In this paper, the effect of surface alloying on the microstructure and wear behavior of ductile iron was studied using optical microscopy and X-ray diffractometry, which revealed that cladded layers consist of austenite (Fe, C), γ(Fe, Ni), and small quantities of carbides such as Cr7C3.

56 citations

Journal Article
TL;DR: In this paper, variable polarity plasma arc (VPPA) welding was used at NASA's Marshall Space Flight Center for the fabrication of the Space Shuttle External Tank (SSET).
Abstract: Variable polarity plasma arc (VPPA) techniques used at NASA's Marshall Space Flight Center for the fabrication of the Space Shuttle External Tank are presentedd. The high plasma arc jet velocities of 300-2000 m/s are produced by heating the plasma gas as it passes through a constraining orifice, with the plasma arc torch becoming a miniature jet engine. As compared to the GTA jet, the VPPA has the following advantages: (1) less sensitive to contamination, (2) a more symmetrical fusion zone, and (3) greater joint penetration. The VPPA welding system is computerized, operating with a microprocessor, to set welding variables in accordance with set points inputs, including the manipulator and wire feeder, as well as torch control and power supply. Some other VPPA welding technique advantages are: reduction in weld repair costs by elimination of porosity; reduction of joint preparation costs through elimination of the need to scrape or file faying surfaces; reduction in depeaking costs; eventual reduction of the 100 percent-X-ray inspection requirements. The paper includes a series of schematic and block diagrams.

56 citations

Journal ArticleDOI
TL;DR: In this article, the effect of heat input on the mechanical properties of low-carbon steel was studied using two welding processes: Oxy-Acetylene Welding (OAW) and Shielded Metal Arc Welding(SMAW).
Abstract: In this work, the effect of heat input on the mechanical properties of low-carbon steel was studied using two welding processes: Oxy-Acetylene Welding (OAW) and Shielded Metal Arc Welding (SMAW). Two different edge preparations on a specific size, 10-mm thick low-carbon steel, with the following welding parameters: dual welding voltage of 100 V and 220 V, various welding currents at 100, 120, and 150 Amperes and different mild steel electrode gauges of 10 and 12 were investigated. The tensile strength, hardness and impact strength of the welded joint were carried out and it was discovered that the tensile strength and hardness reduce with the increase in heat input into the weld. However, the impact strength of the weldment increases with the increase in heat input. Besides it was also discovered that V-grooved edge preparation has better mechanical properties as compared with straight edge preparation under the same conditions. Microstructural examinations conducted revealed that the cooling rate in different media has significant effect on the microstructure of the weldment. Pearlite and ferrite were observed in the microstructure, but the proportion of ferrite to pearlite varied under different conditions.

56 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202368
2022108
202192
2020109
201979
2018111