Properties of welded joints made in high strength steel using laser technology
The usage of high strength steels (HSS) provides numerous benefits in the form of the cross- section area reduction causing weight decrease, improvement in exploitation parameters and in result positive financial effect. The most advantageous results are observed in the parts loaded by tensile stres...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Military University of Technology, Warsaw
2017-03-01
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| Series: | Biuletyn Wojskowej Akademii Technicznej |
| Subjects: | |
| Online Access: | http://biuletynwat.pl/gicid/01.3001.0009.9484 |
| _version_ | 1797760722964316160 |
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| author | Tomasz Ślęzak Lucjan Śnieżek |
| author_facet | Tomasz Ślęzak Lucjan Śnieżek |
| author_sort | Tomasz Ślęzak |
| collection | DOAJ |
| description | The usage of high strength steels (HSS) provides numerous benefits in the form of the cross-
section area reduction causing weight decrease, improvement in exploitation parameters and in result positive financial effect. The most advantageous results are observed in the parts loaded by tensile stresses. The factors most influencing the fatigue strength of the metals, especially the steels of high value of yield point, are stress concentration in the originated geometrical notches, local changes of the stress state or the microstructure of paternal material.
Improvement in the fatigue behaviour of HSS steels can be achieved by changing the commonly used technique for high-energy joining technology, namely laser beam welding. Relatively narrow welds and reduced heat-affected zone (HAZ) have minimized the residual stresses and distortions.
The paper presents the results of the studies focused on mechanical properties of welded joints of high strength fine-grained steel S960QL. There was investigated the impact of heat input on the microstructure,
microhardness- and residual stresses in the weld and HAZ. The crucial part is devoted to the fatigue research and fractographic investigation of the fatigue ruptures of laser-made welds. There were also found in the origins the cause of crack initiation.
Keywords: mechanics, fatigue life, high strength steel, laser welding |
| first_indexed | 2024-03-12T19:02:41Z |
| format | Article |
| id | doaj.art-cc2cb542f2884d2186c098d8967b434d |
| institution | Directory Open Access Journal |
| issn | 1234-5865 |
| language | English |
| last_indexed | 2024-03-12T19:02:41Z |
| publishDate | 2017-03-01 |
| publisher | Military University of Technology, Warsaw |
| record_format | Article |
| series | Biuletyn Wojskowej Akademii Technicznej |
| spelling | doaj.art-cc2cb542f2884d2186c098d8967b434d2023-08-02T06:30:41ZengMilitary University of Technology, WarsawBiuletyn Wojskowej Akademii Technicznej1234-58652017-03-01661556610.5604/01.3001.0009.948401.3001.0009.9484Properties of welded joints made in high strength steel using laser technologyTomasz Ślęzak0Lucjan Śnieżek1Military University of Technology Faculty of Mechanical Engineering, 2 Kaliskiego Str., 00-908 Warsaw, PolandMilitary University of Technology Faculty of Mechanical Engineering, 2 Kaliskiego Str., 00-908 Warsaw, PolandThe usage of high strength steels (HSS) provides numerous benefits in the form of the cross- section area reduction causing weight decrease, improvement in exploitation parameters and in result positive financial effect. The most advantageous results are observed in the parts loaded by tensile stresses. The factors most influencing the fatigue strength of the metals, especially the steels of high value of yield point, are stress concentration in the originated geometrical notches, local changes of the stress state or the microstructure of paternal material. Improvement in the fatigue behaviour of HSS steels can be achieved by changing the commonly used technique for high-energy joining technology, namely laser beam welding. Relatively narrow welds and reduced heat-affected zone (HAZ) have minimized the residual stresses and distortions. The paper presents the results of the studies focused on mechanical properties of welded joints of high strength fine-grained steel S960QL. There was investigated the impact of heat input on the microstructure, microhardness- and residual stresses in the weld and HAZ. The crucial part is devoted to the fatigue research and fractographic investigation of the fatigue ruptures of laser-made welds. There were also found in the origins the cause of crack initiation. Keywords: mechanics, fatigue life, high strength steel, laser weldinghttp://biuletynwat.pl/gicid/01.3001.0009.9484mechanicsfatigue lifehigh strength steellaser welding |
| spellingShingle | Tomasz Ślęzak Lucjan Śnieżek Properties of welded joints made in high strength steel using laser technology Biuletyn Wojskowej Akademii Technicznej mechanics fatigue life high strength steel laser welding |
| title | Properties of welded joints made in high strength steel using laser technology |
| title_full | Properties of welded joints made in high strength steel using laser technology |
| title_fullStr | Properties of welded joints made in high strength steel using laser technology |
| title_full_unstemmed | Properties of welded joints made in high strength steel using laser technology |
| title_short | Properties of welded joints made in high strength steel using laser technology |
| title_sort | properties of welded joints made in high strength steel using laser technology |
| topic | mechanics fatigue life high strength steel laser welding |
| url | http://biuletynwat.pl/gicid/01.3001.0009.9484 |
| work_keys_str_mv | AT tomaszslezak propertiesofweldedjointsmadeinhighstrengthsteelusinglasertechnology AT lucjansniezek propertiesofweldedjointsmadeinhighstrengthsteelusinglasertechnology |