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Related Concept Videos

Residual Stresses01:26

Residual Stresses

303
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...
303

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Induction Heating in Underwater Wet Welding-Thermal Input, Microstructure and Diffusible Hydrogen Content.

Oliver Brätz1, Jan Klett2, Thomas Wolf2

  • 1Fraunhofer Institute for Large Structures in Production Engineering IGP, 18059 Rostock, Germany.

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

Post-weld induction heating effectively reduces hydrogen in underwater wet welds of high-strength steels. This method lowers diffusible hydrogen content by 34% at 30m, mitigating cracking risks in structural steel applications.

Keywords:
fine-grained construction steelhydrogen analysishyperbaric wet weldinginduction heatingpost-weld heat treatmentpreheatingunderwater technology

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Area of Science:

  • Materials Science
  • Welding Engineering
  • Metallurgy

Background:

  • Hydrogen-assisted cracking is a critical issue in underwater wet welding of high-strength steels.
  • Traditional post-weld heat treatments are not feasible in wet welding environments.
  • Induction heating offers a potential solution by generating heat directly within the workpiece.

Purpose of the Study:

  • To characterize thermal input from an underwater induction heating system.
  • To evaluate the impact of post-weld induction heating on weldment microstructure.
  • To quantify the reduction in diffusible hydrogen content in weld metal.

Main Methods:

  • Characterization of thermal input using a commercial induction heating system under water.
  • Microstructural analysis of weldments in structural steels with varying strength and composition.
  • Quantification of diffusible hydrogen using the carrier gas hot extraction method.

Main Results:

  • The thermal input of the underwater induction heating system was successfully characterized.
  • Post-weld induction heating was shown to influence the microstructure of the weldments.
  • A significant reduction of -34% in diffusible hydrogen content was achieved at a simulated water depth of 30 m.

Conclusions:

  • Post-weld induction heating is a viable method for reducing diffusible hydrogen in underwater wet welds.
  • This technique can help mitigate hydrogen-assisted cracking in high-strength steel welds.
  • Induction heating presents a promising approach for improving the integrity of underwater welded structures.