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Effect of Continuous and Pulsed Currents on Microstructural Evolution of Stainless Steel Joined by TIG Welding

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Published/Copyright: November 5, 2015
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Practical Metallography
From the journal Practical Metallography Volume 52 Issue 11

Abstract

In this study, AISI 316L series austenitic stainless steel sheets were joined by tungsten inert gas welding method in continuous and pulsed currents. Regarding microstructural investigation and hardness values of weld metal, samples were welded to investigate the effect of current type on grain structures of weld metal. Results showed that samples welded by using pulsed current had considerable different properties compared to the samples welded by using continuous current. While the weld metals of joinings obtained by using continuous current displayed a coarse-grained and columnar structure, weld metals obtained by using pulsed current had a finer-grained structure. It was also found that hardness values of samples, which were welded with continuous and pulsed current, were quite different.

Kurzfassung

Bei dieser Untersuchung wurden Bleche aus rostfreiem austenitischem Stahl (Serie AISI 316L) unter Anwendung der Wolfram-Inertgas-Technik mit Dauer- und Impulsstrom miteinander verschweißt. Die Proben wurden verschweißt, um Mikrostruktur und Härtewerte des Schweißguts und somit den Einflusses der Stromart auf die Kornstrukturen im Schweißgut zu untersuchen. Die Ergebnisse zeigten, dass die mit Impulsstrom verschweißten Proben im Vergleich zu den mittels Dauerstrom verschweißten Proben deutlich abweichende Eigenschaften aufwiesen. Während das Schweißgut der durch Dauerstrom gebildeten Schweißnähte eine grobkörnige und säulenartige Struktur aufwies, hatte das durch Impulsstrom entstandene Schweißgut eine feinkörnigere Struktur. Es konnte zudem festgestellt werden, dass die Härtewerte der durch Dauerstrom und Impulsstrom verschweißten Proben unterschiedlich ausfielen.

Übersetzung: E. Engert

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Received: 2015-04-10
Accepted: 2015-09-07
Published Online: 2015-11-05
Published in Print: 2015-11-16

© 2015, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Effect of Continuous and Pulsed Currents on Microstructural Evolution of Stainless Steel Joined by TIG Welding
  7. Microstructure Representation of Steels by Means of Ferrofluids
  8. Metallurgical Failure Investigation of Overheated Brackets Made of Nimonic Alloy 90
  9. Meeting Diary/Veranstaltungskalender
  10. Meeting Diary
https://doi.org/10.3139/147.110352

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Effect of Continuous and Pulsed Currents on Microstructural Evolution of Stainless Steel Joined by TIG Welding
  7. Microstructure Representation of Steels by Means of Ferrofluids
  8. Metallurgical Failure Investigation of Overheated Brackets Made of Nimonic Alloy 90
  9. Meeting Diary/Veranstaltungskalender
  10. Meeting Diary
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