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MAG Welding Tests of Modern High Strength Steels with Minimum Yield Strength of 700 MPa

Tutkimustuotosvertaisarvioitu

Standard

MAG Welding Tests of Modern High Strength Steels with Minimum Yield Strength of 700 MPa. / Lahtinen, Teemu; Vilaca, Pedro ; Peura, Pasi; Mehtonen, Saara .

julkaisussa: Applied Sciences, Vuosikerta 9, Nro 5, 1031, 12.03.2019, s. 1-18.

Tutkimustuotosvertaisarvioitu

Harvard

Lahtinen, T, Vilaca, P, Peura, P & Mehtonen, S 2019, 'MAG Welding Tests of Modern High Strength Steels with Minimum Yield Strength of 700 MPa', Applied Sciences, Vuosikerta. 9, Nro 5, 1031, Sivut 1-18. https://doi.org/10.3390/app9051031

APA

Lahtinen, T., Vilaca, P., Peura, P., & Mehtonen, S. (2019). MAG Welding Tests of Modern High Strength Steels with Minimum Yield Strength of 700 MPa. Applied Sciences, 9(5), 1-18. [1031]. https://doi.org/10.3390/app9051031

Vancouver

Author

Lahtinen, Teemu ; Vilaca, Pedro ; Peura, Pasi ; Mehtonen, Saara . / MAG Welding Tests of Modern High Strength Steels with Minimum Yield Strength of 700 MPa. Julkaisussa: Applied Sciences. 2019 ; Vuosikerta 9, Nro 5. Sivut 1-18.

Bibtex - Lataa

@article{aee7fc95abe34cb1b828092304a5d343,
title = "MAG Welding Tests of Modern High Strength Steels with Minimum Yield Strength of 700 MPa",
abstract = "The modern high strength steel plates have an excellent combination of strength and toughness based on micro-alloying and complex microstructure. Retaining this combination of properties in the weld zone is a major challenge for applications in high-demanding structural construction. This work investigates the weldability of three different modern high strength steel plates, with a thickness of 8 mm. Two of the test materials were produced by a thermo-mechanically controlled process (TMCP) and one by a quenching and tempering method (Q&T). Two-passes MAG (metal active gas) welding was used with four different heat inputs. The tests implemented on all the materials included tensile, hardness profiles (HV5), Charpy-V impact toughness tests, and microstructure analysis using scanning electron microscope (SEM). For one of the TMCP steels, some extended tests were conducted to define how the tensile properties change along the weld line. These tests included tensile tests with digital image correlation (DIC), and 3-point bending tests. The most notable differences in mechanical properties of the welds between the materials were observed in Charpy-V impact toughness tests, mostly at the vicinity of the fusion line, with the Q&T steel more prone to embrittlement of the heat affected zone (HAZ) than the TMCP steels. Microstructural analysis revealed carbide concentration combined with coarse bainitic structures in HAZ of Q&T steel, explaining the more severe embrittlement. During the tensile tests, the DIC measurements have shown a strain localization in the softest region of the HAZ. Increasing the heat input resulted in earlier localization of the strain and less maximum strength. The tensile properties along the weld line were investigated in all welding conditions, and the results emphasize relevant and systematic differences of the yield strength at the transient zones near the start and end of the weld compared with the intermediate stationary domain.",
keywords = "high strength steels, weldability, thermo-mechanically controlled process, quench and temper, MAG welding, digital image correlation, microstructure",
author = "Teemu Lahtinen and Pedro Vilaca and Pasi Peura and Saara Mehtonen",
year = "2019",
month = "3",
day = "12",
doi = "10.3390/app9051031",
language = "English",
volume = "9",
pages = "1--18",
journal = "Applied Sciences",
issn = "2076-3417",
publisher = "MDPI",
number = "5",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - MAG Welding Tests of Modern High Strength Steels with Minimum Yield Strength of 700 MPa

AU - Lahtinen, Teemu

AU - Vilaca, Pedro

AU - Peura, Pasi

AU - Mehtonen, Saara

PY - 2019/3/12

Y1 - 2019/3/12

N2 - The modern high strength steel plates have an excellent combination of strength and toughness based on micro-alloying and complex microstructure. Retaining this combination of properties in the weld zone is a major challenge for applications in high-demanding structural construction. This work investigates the weldability of three different modern high strength steel plates, with a thickness of 8 mm. Two of the test materials were produced by a thermo-mechanically controlled process (TMCP) and one by a quenching and tempering method (Q&T). Two-passes MAG (metal active gas) welding was used with four different heat inputs. The tests implemented on all the materials included tensile, hardness profiles (HV5), Charpy-V impact toughness tests, and microstructure analysis using scanning electron microscope (SEM). For one of the TMCP steels, some extended tests were conducted to define how the tensile properties change along the weld line. These tests included tensile tests with digital image correlation (DIC), and 3-point bending tests. The most notable differences in mechanical properties of the welds between the materials were observed in Charpy-V impact toughness tests, mostly at the vicinity of the fusion line, with the Q&T steel more prone to embrittlement of the heat affected zone (HAZ) than the TMCP steels. Microstructural analysis revealed carbide concentration combined with coarse bainitic structures in HAZ of Q&T steel, explaining the more severe embrittlement. During the tensile tests, the DIC measurements have shown a strain localization in the softest region of the HAZ. Increasing the heat input resulted in earlier localization of the strain and less maximum strength. The tensile properties along the weld line were investigated in all welding conditions, and the results emphasize relevant and systematic differences of the yield strength at the transient zones near the start and end of the weld compared with the intermediate stationary domain.

AB - The modern high strength steel plates have an excellent combination of strength and toughness based on micro-alloying and complex microstructure. Retaining this combination of properties in the weld zone is a major challenge for applications in high-demanding structural construction. This work investigates the weldability of three different modern high strength steel plates, with a thickness of 8 mm. Two of the test materials were produced by a thermo-mechanically controlled process (TMCP) and one by a quenching and tempering method (Q&T). Two-passes MAG (metal active gas) welding was used with four different heat inputs. The tests implemented on all the materials included tensile, hardness profiles (HV5), Charpy-V impact toughness tests, and microstructure analysis using scanning electron microscope (SEM). For one of the TMCP steels, some extended tests were conducted to define how the tensile properties change along the weld line. These tests included tensile tests with digital image correlation (DIC), and 3-point bending tests. The most notable differences in mechanical properties of the welds between the materials were observed in Charpy-V impact toughness tests, mostly at the vicinity of the fusion line, with the Q&T steel more prone to embrittlement of the heat affected zone (HAZ) than the TMCP steels. Microstructural analysis revealed carbide concentration combined with coarse bainitic structures in HAZ of Q&T steel, explaining the more severe embrittlement. During the tensile tests, the DIC measurements have shown a strain localization in the softest region of the HAZ. Increasing the heat input resulted in earlier localization of the strain and less maximum strength. The tensile properties along the weld line were investigated in all welding conditions, and the results emphasize relevant and systematic differences of the yield strength at the transient zones near the start and end of the weld compared with the intermediate stationary domain.

KW - high strength steels

KW - weldability

KW - thermo-mechanically controlled process

KW - quench and temper

KW - MAG welding

KW - digital image correlation

KW - microstructure

U2 - 10.3390/app9051031

DO - 10.3390/app9051031

M3 - Article

VL - 9

SP - 1

EP - 18

JO - Applied Sciences

JF - Applied Sciences

SN - 2076-3417

IS - 5

M1 - 1031

ER -