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4. Additive manufacturing: of steel alloys using laser powder-bed fusion: in order to expand the choice of materials available for use in additive manufacturing, parameters that consider welding metallurgy, laser powder interaction, and post processing must be developed

Author

Jamshidinia, Mahdi, Sadek, Alber, Wang, Wesley, and Kelly, Shawn

Subjects
Metals -- Properties, Powders -- Analysis, 3D printing -- Technology application -- Marketing, Steel alloys -- Usage, Degassing of metals -- Properties, Boron steel -- Usage, Welding -- Evaluation, Company marketing practices, Technology application, Engineering and manufacturing industries, Science and technology
Abstract

Additive manufacturing (AM) is commonly defined as the production of a functional engineering component built one layer at a time from computer aided design (CAD) data. Applicable metal AM technologies [...]

Published
2015

20. Influence of Shielding Gas Composition on the Properties of Flux-Cored Arc Welds of Plain Carbon Steel

Author

Gadallah, Ramy, Fahmy, Raouf, Khalifa, Tarek, Sadek, Alber, Gadallah, Ramy, Fahmy, Raouf, Khalifa, Tarek, and Sadek, Alber

Abstract

In this study, the influence of variation in the shielding gas composition on the weld properties of steel ST 37-3 was investigated. Six different shielding gas compositions in addition to pure argon (Ar) and pure CO2 were studied in this work using flux cored arc welding (FCAW) process. For bead-on-plate (B.O.P) specimens pure Ar shielding gas has excellent arc stability; however, with increase of the CO2 percent in the shielding gas compositions, the arc stability becomes noisy (unstable arc) especially for pure CO2. 75% Ar – 25% CO2 shielding gas composition has the optimum deposition rate among other shielding gases for B.O.P. Furthermore, for complete real welded joints, the absorbed energy in the Charpy impact toughness test of weld metal (W.M) decreases with increase of the CO2 percent in the shielding gas composition. Additionally, the hardness of W.M decreases with the increase of the CO2 percent in the shielding gas composition.

Published
2012

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