Steel microstructures in autogeneous laser welds

N.A. McPherson, H. Samson, N. Suarez-Fernandez, T.N. Baker

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Autogenous Nd:YAG laser welding was carried out on austenitic stainless steel (316LN) and duplex stainless steel (2205). The structures were examined using optical and color etching metallography. This showed optically that the austenitic steel solidified as a totally austenitic structure, but the transmission electron microscopy (TEM) work confirmed the presence of ferrite. In the case of the duplex stainless steel, the solidification structure was almost 100% ferrite. However, the weld metal properties required were met. Dissimilar autogenous Nd:YAG laser welding was performed on a duplex stainless steel to carbon steel joint and on an austenitic stainless steel to carbon steel joint. This revealed the presence of preferential fluid flow to the stainless steel side in the weld metal, and areas of excessive hardness. The results of this study were that filler wire would be required to counteract the high hardness effects induced by the autogenous laser welding process, without having to resort to postweld heat treatment. An evaluation has also taken place of autogenous CO2 laser welds of D and DH 36 steel. Mechanical properties of the DH 36 steel have been found to be acceptable, and the structure of the D grade material has been examined using TEM, where pearlite and bainite have been identified as being present.
LanguageEnglish
Pages200-201
Number of pages1
JournalJournal of Laser Applications
Volume15
Issue number4
DOIs
Publication statusPublished - Nov 2003

Fingerprint

Steel
Stainless Steel
laser welding
Laser beam welding
stainless steels
Welds
Stainless steel
steels
microstructure
Microstructure
Lasers
austenitic stainless steels
carbon steels
Austenitic stainless steel
Carbon steel
lasers
Ferrite
YAG lasers
ferrites
hardness

Keywords

  • steel microstructures
  • autogenous laser
  • welding process
  • pearlite
  • bainite

Cite this

McPherson, N.A. ; Samson, H. ; Suarez-Fernandez, N. ; Baker, T.N. / Steel microstructures in autogeneous laser welds. In: Journal of Laser Applications. 2003 ; Vol. 15, No. 4. pp. 200-201.
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McPherson, NA, Samson, H, Suarez-Fernandez, N & Baker, TN 2003, 'Steel microstructures in autogeneous laser welds' Journal of Laser Applications, vol. 15, no. 4, pp. 200-201. https://doi.org/10.2351/1.1619997

Steel microstructures in autogeneous laser welds. / McPherson, N.A.; Samson, H.; Suarez-Fernandez, N.; Baker, T.N.

In: Journal of Laser Applications, Vol. 15, No. 4, 11.2003, p. 200-201.

Research output: Contribution to journalArticle

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