The Formation Mechanisms and Improvement Measures for Penetrating Cracks in QAl9-4/Q345B Welded Joint

Jian Wang; Camila Caroline de Castro; Xiaofeng Lu

doi:10.1007/s11665-020-04749-2

The Formation Mechanisms and Improvement Measures for Penetrating Cracks in QAl9-4/Q345B Welded Joint

Jian Wang, Camila Caroline de Castro, Xiaofeng Lu

School of Mechanical and Power Engineering

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The dissimilar joining of QAl9-4 aluminum-bronze alloy to Q345B low carbon low alloy steel was performed by fusion welding using different techniques. The results indicated a certain amount of transverse cracks and voids in the QAl9-4/Q345B joints welded by the SMAW process, while defect-free joints were obtained using the GTAW process. The microstructure of samples produced by the SMAW process exhibited transverse cracks with typical partially oxidized intergranular cracking characteristics. Banded films rich in Cu at the grain boundaries were observed, which were demonstrated to be related to premature failure of the samples under tensile and impact load, indicating that the transverse cracks are hot cracks caused by the penetration of Cu element. Good strength and good toughness of QAl9-4/Q345B welded joints were obtained by the GTAW process.

Original language	English
Pages (from-to)	2346-2354
Number of pages	9
Journal	Journal of Materials Engineering and Performance
Volume	29
Issue number	4
DOIs	https://doi.org/10.1007/s11665-020-04749-2
State	Published - 1 Apr 2020

Keywords

aluminum-bronze
copper
penetrating crack

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10.1007/s11665-020-04749-2

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title = "The Formation Mechanisms and Improvement Measures for Penetrating Cracks in QAl9-4/Q345B Welded Joint",

abstract = "The dissimilar joining of QAl9-4 aluminum-bronze alloy to Q345B low carbon low alloy steel was performed by fusion welding using different techniques. The results indicated a certain amount of transverse cracks and voids in the QAl9-4/Q345B joints welded by the SMAW process, while defect-free joints were obtained using the GTAW process. The microstructure of samples produced by the SMAW process exhibited transverse cracks with typical partially oxidized intergranular cracking characteristics. Banded films rich in Cu at the grain boundaries were observed, which were demonstrated to be related to premature failure of the samples under tensile and impact load, indicating that the transverse cracks are hot cracks caused by the penetration of Cu element. Good strength and good toughness of QAl9-4/Q345B welded joints were obtained by the GTAW process.",

keywords = "aluminum-bronze, copper, penetrating crack",

author = "Jian Wang and {de Castro}, {Camila Caroline} and Xiaofeng Lu",

note = "Publisher Copyright: {\textcopyright} 2020, ASM International.",

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doi = "10.1007/s11665-020-04749-2",

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T1 - The Formation Mechanisms and Improvement Measures for Penetrating Cracks in QAl9-4/Q345B Welded Joint

AU - Wang, Jian

AU - de Castro, Camila Caroline

AU - Lu, Xiaofeng

PY - 2020/4/1

Y1 - 2020/4/1

N2 - The dissimilar joining of QAl9-4 aluminum-bronze alloy to Q345B low carbon low alloy steel was performed by fusion welding using different techniques. The results indicated a certain amount of transverse cracks and voids in the QAl9-4/Q345B joints welded by the SMAW process, while defect-free joints were obtained using the GTAW process. The microstructure of samples produced by the SMAW process exhibited transverse cracks with typical partially oxidized intergranular cracking characteristics. Banded films rich in Cu at the grain boundaries were observed, which were demonstrated to be related to premature failure of the samples under tensile and impact load, indicating that the transverse cracks are hot cracks caused by the penetration of Cu element. Good strength and good toughness of QAl9-4/Q345B welded joints were obtained by the GTAW process.

AB - The dissimilar joining of QAl9-4 aluminum-bronze alloy to Q345B low carbon low alloy steel was performed by fusion welding using different techniques. The results indicated a certain amount of transverse cracks and voids in the QAl9-4/Q345B joints welded by the SMAW process, while defect-free joints were obtained using the GTAW process. The microstructure of samples produced by the SMAW process exhibited transverse cracks with typical partially oxidized intergranular cracking characteristics. Banded films rich in Cu at the grain boundaries were observed, which were demonstrated to be related to premature failure of the samples under tensile and impact load, indicating that the transverse cracks are hot cracks caused by the penetration of Cu element. Good strength and good toughness of QAl9-4/Q345B welded joints were obtained by the GTAW process.

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KW - copper

KW - penetrating crack

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The Formation Mechanisms and Improvement Measures for Penetrating Cracks in QAl9-4/Q345B Welded Joint

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Keywords

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