Metallurgical response of weld metal to different filler metal and joint design combinations of laser-arc hybrid welded lean duplex and novel ferritic stainless steels

Miikka Karhu, Veli Kujanpää, Jyrki Romu, Teemu Sarikka

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Laser and laser-arc hybrid welding of duplex and ferritic stainless steels is demanding, because microstructure of the welds tends to be highly ferritic. Therefore, filler metal must be used for maintaining corrosion and mechanical properties of the welds. In this study, different filler metals including duplex, basic, and overalloyed austenitic grades were used with laser-arc hybrid method to weld lean duplex 1.4162 and novel ferritic stainless steels grades 1.4622 and 1.4509. Several sets of joint design and welding parameter combinations were used to adjust the amount of filler metal in the weld. The purpose of the trials was to evaluate whether weld metal microstructures (grain morphology, austenite/ferrite balance, etc.) can be modified by using an applicable joint preparation and an "overmatched" filler metal addition. Weld characterization included several research methods such as: Macro- and microscopic examination using light microscop? cross-sectional dilution ratio determination from the metallographic cross sections, electron backscatter diffraction method in order to assess austenite, and ferrite phase proportions in the test welds. The effects of used groove geometry, filler metal composition, and content on resulting metallurgical features of the welds are discussed in detail.
Original languageEnglish
Article number022422
JournalJournal of Laser Applications
Volume28
Issue number2
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

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ferritic stainless steels
Filler metals
Stainless Steel
Ferritic steel
fillers
Welds
Stainless steel
arcs
Metals
Lasers
metals
lasers
austenite
welding
weld tests
ferrites
grade
Austenite
Ferrite
microstructure

Keywords

  • laser-arc hybrid welding
  • stainless steels
  • microstructure
  • filler metal composition

Cite this

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title = "Metallurgical response of weld metal to different filler metal and joint design combinations of laser-arc hybrid welded lean duplex and novel ferritic stainless steels",
abstract = "Laser and laser-arc hybrid welding of duplex and ferritic stainless steels is demanding, because microstructure of the welds tends to be highly ferritic. Therefore, filler metal must be used for maintaining corrosion and mechanical properties of the welds. In this study, different filler metals including duplex, basic, and overalloyed austenitic grades were used with laser-arc hybrid method to weld lean duplex 1.4162 and novel ferritic stainless steels grades 1.4622 and 1.4509. Several sets of joint design and welding parameter combinations were used to adjust the amount of filler metal in the weld. The purpose of the trials was to evaluate whether weld metal microstructures (grain morphology, austenite/ferrite balance, etc.) can be modified by using an applicable joint preparation and an {"}overmatched{"} filler metal addition. Weld characterization included several research methods such as: Macro- and microscopic examination using light microscop? cross-sectional dilution ratio determination from the metallographic cross sections, electron backscatter diffraction method in order to assess austenite, and ferrite phase proportions in the test welds. The effects of used groove geometry, filler metal composition, and content on resulting metallurgical features of the welds are discussed in detail.",
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author = "Miikka Karhu and Veli Kujanp{\"a}{\"a} and Jyrki Romu and Teemu Sarikka",
year = "2016",
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language = "English",
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journal = "Journal of Laser Applications",
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Metallurgical response of weld metal to different filler metal and joint design combinations of laser-arc hybrid welded lean duplex and novel ferritic stainless steels. / Karhu, Miikka; Kujanpää, Veli; Romu, Jyrki; Sarikka, Teemu.

In: Journal of Laser Applications, Vol. 28, No. 2, 022422, 2016.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Karhu, Miikka

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AU - Romu, Jyrki

AU - Sarikka, Teemu

PY - 2016

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