Ultrasonic spot welding of a clad 7075 aluminum alloy: Strength and fatigue life
[Display omitted] •The “unweldable” Al7075 alloy is successfully welded with a clad layer via USW.•Clad layer of AA7072 alloy contributes to the defect-free sound welded joints.•Tensile lap shear strength exceeds AWS D17.2 standards at higher energy levels.•The solid-state ultrasonic spot welded joi...
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| Veröffentlicht in: | International journal of fatigue 2020-12, Vol.141, p.105869, Article 105869 |
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| container_title | International journal of fatigue |
| container_volume | 141 |
| creator | Mohammed, S.M.A.K. Jaya, Y.D. Albedah, A. Jiang, X.Q. Li, D.Y. Chen, D.L. |
| description | [Display omitted]
•The “unweldable” Al7075 alloy is successfully welded with a clad layer via USW.•Clad layer of AA7072 alloy contributes to the defect-free sound welded joints.•Tensile lap shear strength exceeds AWS D17.2 standards at higher energy levels.•The solid-state ultrasonic spot welded joints exhibit superior fatigue resistance.•Depending on cyclic load levels, two types of fatigue failure modes are observed.
The purpose of this study was to examine weldability of an AA7072-cladded high-strength AA7075-T6 via ultrasonic spot welding, focusing on the influence of welding energy on mechanical properties and failure mechanisms. Defect-free sound joints were achieved with robust bonding and grain refinement via dynamic recrystallization at the weld interface, leading to superior static and fatigue properties. The nominal tensile lap shear strength increased with increasing welding energy, and exceeded AWS D17.2 standards at higher energy levels. Interfacial failure at higher cyclic loads with distinctive elongated shear dimples and fatigue striations and transverse through-thickness failure at lower cyclic loads were observed. |
| doi_str_mv | 10.1016/j.ijfatigue.2020.105869 |
| format | Article |
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•The “unweldable” Al7075 alloy is successfully welded with a clad layer via USW.•Clad layer of AA7072 alloy contributes to the defect-free sound welded joints.•Tensile lap shear strength exceeds AWS D17.2 standards at higher energy levels.•The solid-state ultrasonic spot welded joints exhibit superior fatigue resistance.•Depending on cyclic load levels, two types of fatigue failure modes are observed.
The purpose of this study was to examine weldability of an AA7072-cladded high-strength AA7075-T6 via ultrasonic spot welding, focusing on the influence of welding energy on mechanical properties and failure mechanisms. Defect-free sound joints were achieved with robust bonding and grain refinement via dynamic recrystallization at the weld interface, leading to superior static and fatigue properties. The nominal tensile lap shear strength increased with increasing welding energy, and exceeded AWS D17.2 standards at higher energy levels. Interfacial failure at higher cyclic loads with distinctive elongated shear dimples and fatigue striations and transverse through-thickness failure at lower cyclic loads were observed.</description><identifier>ISSN: 0142-1123</identifier><identifier>EISSN: 1879-3452</identifier><identifier>DOI: 10.1016/j.ijfatigue.2020.105869</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>AA7072 clad ; AA7075 ; Aluminum base alloys ; Bonded joints ; Cyclic loads ; Dimpling ; Dynamic recrystallization ; Energy levels ; Failure mechanisms ; Fatigue ; Fatigue failure ; Fatigue life ; Grain refinement ; Heat treating ; Materials fatigue ; Mechanical properties ; Metal fatigue ; Shear strength ; Spot welding ; Striations ; Tensile lap shear strength ; Ultrasonic spot welding ; Ultrasonic testing</subject><ispartof>International journal of fatigue, 2020-12, Vol.141, p.105869, Article 105869</ispartof><rights>2020 Elsevier Ltd</rights><rights>Copyright Elsevier BV Dec 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c343t-50e4c726b4a93764d90ca1823a5e7d22c77a35a13c02e2534f17fb2f4f144e33</citedby><cites>FETCH-LOGICAL-c343t-50e4c726b4a93764d90ca1823a5e7d22c77a35a13c02e2534f17fb2f4f144e33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.ijfatigue.2020.105869$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3541,27915,27916,45986</link.rule.ids></links><search><creatorcontrib>Mohammed, S.M.A.K.</creatorcontrib><creatorcontrib>Jaya, Y.D.</creatorcontrib><creatorcontrib>Albedah, A.</creatorcontrib><creatorcontrib>Jiang, X.Q.</creatorcontrib><creatorcontrib>Li, D.Y.</creatorcontrib><creatorcontrib>Chen, D.L.</creatorcontrib><title>Ultrasonic spot welding of a clad 7075 aluminum alloy: Strength and fatigue life</title><title>International journal of fatigue</title><description>[Display omitted]
•The “unweldable” Al7075 alloy is successfully welded with a clad layer via USW.•Clad layer of AA7072 alloy contributes to the defect-free sound welded joints.•Tensile lap shear strength exceeds AWS D17.2 standards at higher energy levels.•The solid-state ultrasonic spot welded joints exhibit superior fatigue resistance.•Depending on cyclic load levels, two types of fatigue failure modes are observed.
The purpose of this study was to examine weldability of an AA7072-cladded high-strength AA7075-T6 via ultrasonic spot welding, focusing on the influence of welding energy on mechanical properties and failure mechanisms. Defect-free sound joints were achieved with robust bonding and grain refinement via dynamic recrystallization at the weld interface, leading to superior static and fatigue properties. The nominal tensile lap shear strength increased with increasing welding energy, and exceeded AWS D17.2 standards at higher energy levels. Interfacial failure at higher cyclic loads with distinctive elongated shear dimples and fatigue striations and transverse through-thickness failure at lower cyclic loads were observed.</description><subject>AA7072 clad</subject><subject>AA7075</subject><subject>Aluminum base alloys</subject><subject>Bonded joints</subject><subject>Cyclic loads</subject><subject>Dimpling</subject><subject>Dynamic recrystallization</subject><subject>Energy levels</subject><subject>Failure mechanisms</subject><subject>Fatigue</subject><subject>Fatigue failure</subject><subject>Fatigue life</subject><subject>Grain refinement</subject><subject>Heat treating</subject><subject>Materials fatigue</subject><subject>Mechanical properties</subject><subject>Metal fatigue</subject><subject>Shear strength</subject><subject>Spot welding</subject><subject>Striations</subject><subject>Tensile lap shear strength</subject><subject>Ultrasonic spot welding</subject><subject>Ultrasonic testing</subject><issn>0142-1123</issn><issn>1879-3452</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqFkEtLAzEQx4MoWKufwYDnrXluut5K8QUFBes5pNlJzbLd1CSr9Nu7ZcWrpxmG_4P5IXRNyYwSWt42M984k_22hxkj7HiV87I6QRM6V1XBhWSnaEKoYAWljJ-ji5QaQkhFlJyg1_c2R5NC5y1O-5DxN7S177Y4OGywbU2N1SDEpu13vut3w9KGwx1-yxG6bf7Apqvxbz1uvYNLdOZMm-Dqd07R-uF-vXwqVi-Pz8vFqrBc8FxIAsIqVm6EqbgqRV0Ra-iccSNB1YxZpQyXhnJLGDDJhaPKbZgbphDA-RTdjLH7GD57SFk3oY_d0KiZJFLQuRDVoFKjysaQUgSn99HvTDxoSvSRnm70Hz19pKdHeoNzMTph-OHLQ9TJeugs1D6CzboO_t-MH683ewE</recordid><startdate>202012</startdate><enddate>202012</enddate><creator>Mohammed, S.M.A.K.</creator><creator>Jaya, Y.D.</creator><creator>Albedah, A.</creator><creator>Jiang, X.Q.</creator><creator>Li, D.Y.</creator><creator>Chen, D.L.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>202012</creationdate><title>Ultrasonic spot welding of a clad 7075 aluminum alloy: Strength and fatigue life</title><author>Mohammed, S.M.A.K. ; Jaya, Y.D. ; Albedah, A. ; Jiang, X.Q. ; Li, D.Y. ; Chen, D.L.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c343t-50e4c726b4a93764d90ca1823a5e7d22c77a35a13c02e2534f17fb2f4f144e33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>AA7072 clad</topic><topic>AA7075</topic><topic>Aluminum base alloys</topic><topic>Bonded joints</topic><topic>Cyclic loads</topic><topic>Dimpling</topic><topic>Dynamic recrystallization</topic><topic>Energy levels</topic><topic>Failure mechanisms</topic><topic>Fatigue</topic><topic>Fatigue failure</topic><topic>Fatigue life</topic><topic>Grain refinement</topic><topic>Heat treating</topic><topic>Materials fatigue</topic><topic>Mechanical properties</topic><topic>Metal fatigue</topic><topic>Shear strength</topic><topic>Spot welding</topic><topic>Striations</topic><topic>Tensile lap shear strength</topic><topic>Ultrasonic spot welding</topic><topic>Ultrasonic testing</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mohammed, S.M.A.K.</creatorcontrib><creatorcontrib>Jaya, Y.D.</creatorcontrib><creatorcontrib>Albedah, A.</creatorcontrib><creatorcontrib>Jiang, X.Q.</creatorcontrib><creatorcontrib>Li, D.Y.</creatorcontrib><creatorcontrib>Chen, D.L.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>International journal of fatigue</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mohammed, S.M.A.K.</au><au>Jaya, Y.D.</au><au>Albedah, A.</au><au>Jiang, X.Q.</au><au>Li, D.Y.</au><au>Chen, D.L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ultrasonic spot welding of a clad 7075 aluminum alloy: Strength and fatigue life</atitle><jtitle>International journal of fatigue</jtitle><date>2020-12</date><risdate>2020</risdate><volume>141</volume><spage>105869</spage><pages>105869-</pages><artnum>105869</artnum><issn>0142-1123</issn><eissn>1879-3452</eissn><abstract>[Display omitted]
•The “unweldable” Al7075 alloy is successfully welded with a clad layer via USW.•Clad layer of AA7072 alloy contributes to the defect-free sound welded joints.•Tensile lap shear strength exceeds AWS D17.2 standards at higher energy levels.•The solid-state ultrasonic spot welded joints exhibit superior fatigue resistance.•Depending on cyclic load levels, two types of fatigue failure modes are observed.
The purpose of this study was to examine weldability of an AA7072-cladded high-strength AA7075-T6 via ultrasonic spot welding, focusing on the influence of welding energy on mechanical properties and failure mechanisms. Defect-free sound joints were achieved with robust bonding and grain refinement via dynamic recrystallization at the weld interface, leading to superior static and fatigue properties. The nominal tensile lap shear strength increased with increasing welding energy, and exceeded AWS D17.2 standards at higher energy levels. Interfacial failure at higher cyclic loads with distinctive elongated shear dimples and fatigue striations and transverse through-thickness failure at lower cyclic loads were observed.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ijfatigue.2020.105869</doi></addata></record> |
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| ispartof | International journal of fatigue, 2020-12, Vol.141, p.105869, Article 105869 |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | AA7072 clad AA7075 Aluminum base alloys Bonded joints Cyclic loads Dimpling Dynamic recrystallization Energy levels Failure mechanisms Fatigue Fatigue failure Fatigue life Grain refinement Heat treating Materials fatigue Mechanical properties Metal fatigue Shear strength Spot welding Striations Tensile lap shear strength Ultrasonic spot welding Ultrasonic testing |
| title | Ultrasonic spot welding of a clad 7075 aluminum alloy: Strength and fatigue life |
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