Author
J. Oñoro
Bio: J. Oñoro is an academic researcher from Technical University of Madrid. The author has contributed to research in topics: Welding & Ferrite (iron). The author has an hindex of 3, co-authored 4 publications receiving 138 citations.
Topics: Welding, Ferrite (iron), Fatigue limit, Creep, Martensite
Papers
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TL;DR: In this paper, the formation of delta ferrite in the weld metal of high-strength 9-12%Cr steels has been analyzed for several samples with variations of key alloying elements.
111 citations
TL;DR: In this paper, the performance of laser-welded high-strength low-alloy (HSLA) steels has been evaluated under the present test conditions of 260 MPa and showed that cracks usually start in the fusion zone, near to the borderline between the fusion and heat-affected zones, the cracks growing right into the base metal by the transcrystalline cracking process.
43 citations
01 Oct 2017
5 citations
TL;DR: In this article, the influence of main parameters that take part during TIG welding process are analyzed, such as welding speed, intensity and voltage, and material and tooling features.
Abstract: In this work the influence of main parameters that take part during TIG welding process are analyzed. Some of these parameters belong to the welding process, as for example the welding speed, intensity and voltage while others are from the material and tooling features, as for example foaming material and tooling design. The result of this work shows a strong dependence on these parameters of the TIG welding process for metallic foams.
1 citations
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12 Mar 2014
TL;DR: In this paper, the effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1).
Abstract: In the laser treatment of a workpiece (9), e.g. for surface hardening, melting, alloying, cladding, welding or cutting, the adverse effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1). The two beams (1)(5) may be combined by a beam coupler (4) or may reach the workpiece (9) by separate optical paths (not shown). The shorter wavelength beam (1) improves the coupling efficiency of the higher- powered laser beam (5).
1,539 citations
TL;DR: In this article, the microstructure, microhardness, and tensile properties of 8mm thick hot rolled and quenched S960 high strength low alloy (HSLA) steel plates were welded using a 16kW fiber laser system.
95 citations
TL;DR: In this paper, the effect of heat input on microstructure of indigenously developed reduced activation ferritic martensitic (RAFM) steel weld metal produced by GTAW process has been studied.
79 citations
TL;DR: In this article, a comparative study on influence of activated flux tungsten inert gas (A-TIG), and gas Tungsten arc (GTA) welding processes on the microstructure and the impact of P91 steel welds was carried out.
78 citations
25 Mar 2006-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the fatigue behavior of tailor-welded blanks (TWBs) with and without zinc coating was evaluated and the results showed that TWBs made from zinc-coated/galvanized steels exhibited a lower fatigue limit as compared with the TWB combination from uncoated bare metals.
Abstract: The drive towards weight reduction in the automotive industry has led to the use of tailor-welded blanks (TWBs) for structural applications. This work is aimed at evaluating the fatigue behavior of the TWBs having different thickness combinations and compositions with and without zinc coating. The results showed that TWBs made from zinc-coated/galvanized steels exhibited a lower fatigue limit as compared with the TWB combination from uncoated bare metals. This was attributed to the intergranular cracking in the galvanized TWBs caused by the presence of zinc penetrating beneath the sheet surface. The fracture surface of the uncoated TWB was basically characterized by the fatigue striations.
74 citations