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Related Concept Videos

Steel Fastening Techniques01:17

Steel Fastening Techniques

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Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
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Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel
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Welding Techniques for High Entropy Alloys: Processes, Properties, Characterization, and Challenges.

Merbin John1, Orlando Diaz1, Andres Esparza1

  • 1Department of Mechanical Engineering, University of Nevada, Reno, NV 89557, USA.

Materials (Basel, Switzerland)
|March 25, 2022
PubMed
Summary

High entropy alloys (HEAs) offer superior properties for structural applications. This review details welding techniques like GTAW, LBW, FSW, and EB, examining their impact on HEA microstructure and performance.

Keywords:
fusion weldinghigh entropy alloysmechanical propertiesmicrostructuresolid-state weldingwelding

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Area of Science:

  • Materials Science and Engineering
  • Metallurgy

Background:

  • High entropy alloys (HEAs) are advanced materials with multiple principal elements.
  • HEAs exhibit exceptional mechanical properties, including wear, fatigue, and corrosion resistance.
  • Welding is crucial for utilizing HEAs in structural and functional components.

Purpose of the Study:

  • To provide a comprehensive overview of current welding techniques for HEAs.
  • To analyze the effects of different welding methods on HEA properties.
  • To identify challenges in welding HEAs.

Main Methods:

  • Review of fusion-based welding techniques: Gas Tungsten Arc Welding (GTAW) and Laser Beam Welding (LBW).
  • Review of solid-state welding techniques: Friction Stir Welding (FSW) and Explosive Welding (EB).
  • Analysis of microstructural features and mechanical properties of welded HEAs.

Main Results:

  • Different welding techniques result in varied microstructures and mechanical properties in HEAs.
  • Fusion welding methods like GTAW and LBW are discussed for their applicability.
  • Solid-state methods such as FSW and EB offer alternative approaches for HEA joining.

Conclusions:

  • Appropriate welding techniques are essential for optimizing HEA performance and service life.
  • Understanding the relationship between welding methods, microstructure, and properties is key.
  • Further research is needed to address challenges in HEA welding.