A robust method is introduced to simulate and study the filler wire metallurgy for controlled cooling conditions after melting, enabling efficient mapping with prompt analysis of trends. Proposed is a reduced, though representative, process with more controllable conditions. Short lengths of filler wires are preplaced in a cavity, drilled into a base metal sheet. Irradiation by a pulsed laser beam melts the wire to generate a sample nugget. Pulse shaping influences the cooling rate, granting the ability to tailor weldament microstructures. The method is demonstrated for S1100QL steel and undermatched filler wire, to obtain high toughness for processes like laser-arc hybrid welding, where a representative thermal cycle is needed. For high toughness, a controlled amount of acicular ferrite and, in turn, nonmetallic inclusions is desirable. This “snapshot” method has revealed a characteristic histogram of inclusion sizes, for different pulse shapes. Additional information on the thermal cycle can be acquired by employing thermocouples, a pyrometer, or advanced methods like high speed imaging or modeling. The method offers a wide spectrum of variants and applications.
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May 2019
Research Article|
April 25 2019
Tailored laser pulse method to manipulate filler wire melt metallurgy from thermal cycles
Stephanie M. Robertson
;
Stephanie M. Robertson
1
Department of Engineering Sciences and Mathematics, Luleå University of Technology
, Luleå 97 451, Sweden
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Jan Frostevarg
;
Jan Frostevarg
1
Department of Engineering Sciences and Mathematics, Luleå University of Technology
, Luleå 97 451, Sweden
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Alexander F. H. Kaplan;
Alexander F. H. Kaplan
1
Department of Engineering Sciences and Mathematics, Luleå University of Technology
, Luleå 97 451, Sweden
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Seong Min Hong;
Seong Min Hong
2
Department of Welding and Joining Science Engineering, Chosun University
, Gwangju 501-759, Republic of Korea
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Jong-Hee Kim;
Jong-Hee Kim
2
Department of Welding and Joining Science Engineering, Chosun University
, Gwangju 501-759, Republic of Korea
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Hee-Seon Bang
Hee-Seon Bang
2
Department of Welding and Joining Science Engineering, Chosun University
, Gwangju 501-759, Republic of Korea
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®
Note: This paper is part of the Special Collection: Proceedings of the International Congress of Applications of Lasers & Electro-Optics (ICALEO 2018).
J. Laser Appl. 31, 022605 (2019)
Article history
Received:
March 14 2019
Accepted:
March 14 2019
Citation
Stephanie M. Robertson, Jan Frostevarg, Alexander F. H. Kaplan, Seong Min Hong, Jong-Hee Kim, Hee-Seon Bang; Tailored laser pulse method to manipulate filler wire melt metallurgy from thermal cycles. J. Laser Appl. 1 May 2019; 31 (2): 022605. https://doi.org/10.2351/1.5096145
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