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

    Fingerprint

    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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    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

    AU - Kujanpää, Veli

    AU - Romu, Jyrki

    AU - Sarikka, Teemu

    PY - 2016

    Y1 - 2016

    N2 - 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.

    AB - 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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    KW - filler metal composition

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