Weld Formation Mechanism and Microstructural Evolution of TC4/304 Stainless Steel Joint with Cu-Based Filler Wire and Preheating
Ti-Fe intermetallic compounds were effectively suppressed with Cu-based filler wire and weld formation was greatly improved with the preheating of substrates when joining TC4 titanium alloy and 304 stainless steel. A Ti/Cu transition zone consisting of complex TiCu, Ti<sub>2</sub>Cu<s...
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MDPI AG
2019-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/12/19/3071 |
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| author | Junzhao Li Yibo Liu Zuyang Zhen Peng Jin Qingjie Sun Jicai Feng |
| author_facet | Junzhao Li Yibo Liu Zuyang Zhen Peng Jin Qingjie Sun Jicai Feng |
| author_sort | Junzhao Li |
| collection | DOAJ |
| description | Ti-Fe intermetallic compounds were effectively suppressed with Cu-based filler wire and weld formation was greatly improved with the preheating of substrates when joining TC4 titanium alloy and 304 stainless steel. A Ti/Cu transition zone consisting of complex TiCu, Ti<sub>2</sub>Cu<sub>3</sub>, TiFe, and TiFe<sub>2</sub> phases was formed between Cu-weld/TC4 interface, while Cu-weld/304ss interface was mainly composed of α-Fe and ε-Cu solid solution. At lower heat input, the undercut defect in back surface had potential to cause crack initiation and joint fracture. Though increasing heat input would improve weld morphology, the formation of thick interfacial reaction layer and weld cracking led to low weld quality and joint strength. The preheating of substrates had an obvious effect on wetting ability of liquid filler metal and could achieve a better weld quality at lower heat input. The back formation of weld was improved to decrease the occurrence of weld defects. The highest tensile strength of 365 MPa occurred at welding heat input of 0.483 kJ/cm, increasing by 47% compared to the joint without preheating. The interfacial reaction mechanism was discussed to reveal the relationship between microstructural characteristics and fracture behavior of Ti/steel welded joints with Cu-based filler wire. |
| first_indexed | 2024-04-13T14:37:58Z |
| format | Article |
| id | doaj.art-97fe2908a1c84b239011695ea6d2f3ad |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-13T14:37:58Z |
| publishDate | 2019-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-97fe2908a1c84b239011695ea6d2f3ad2022-12-22T02:42:58ZengMDPI AGMaterials1996-19442019-09-011219307110.3390/ma12193071ma12193071Weld Formation Mechanism and Microstructural Evolution of TC4/304 Stainless Steel Joint with Cu-Based Filler Wire and PreheatingJunzhao Li0Yibo Liu1Zuyang Zhen2Peng Jin3Qingjie Sun4Jicai Feng5State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, No.92 West Dazhi Street, Harbin 150001, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, No.92 West Dazhi Street, Harbin 150001, ChinaShandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, No.2 West Wenhua Road, Weihai 264209, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, No.92 West Dazhi Street, Harbin 150001, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, No.92 West Dazhi Street, Harbin 150001, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, No.92 West Dazhi Street, Harbin 150001, ChinaTi-Fe intermetallic compounds were effectively suppressed with Cu-based filler wire and weld formation was greatly improved with the preheating of substrates when joining TC4 titanium alloy and 304 stainless steel. A Ti/Cu transition zone consisting of complex TiCu, Ti<sub>2</sub>Cu<sub>3</sub>, TiFe, and TiFe<sub>2</sub> phases was formed between Cu-weld/TC4 interface, while Cu-weld/304ss interface was mainly composed of α-Fe and ε-Cu solid solution. At lower heat input, the undercut defect in back surface had potential to cause crack initiation and joint fracture. Though increasing heat input would improve weld morphology, the formation of thick interfacial reaction layer and weld cracking led to low weld quality and joint strength. The preheating of substrates had an obvious effect on wetting ability of liquid filler metal and could achieve a better weld quality at lower heat input. The back formation of weld was improved to decrease the occurrence of weld defects. The highest tensile strength of 365 MPa occurred at welding heat input of 0.483 kJ/cm, increasing by 47% compared to the joint without preheating. The interfacial reaction mechanism was discussed to reveal the relationship between microstructural characteristics and fracture behavior of Ti/steel welded joints with Cu-based filler wire.https://www.mdpi.com/1996-1944/12/19/3071titanium alloysstainless steelcold metal transferintermetallic compoundsmechanical properties |
| spellingShingle | Junzhao Li Yibo Liu Zuyang Zhen Peng Jin Qingjie Sun Jicai Feng Weld Formation Mechanism and Microstructural Evolution of TC4/304 Stainless Steel Joint with Cu-Based Filler Wire and Preheating Materials titanium alloys stainless steel cold metal transfer intermetallic compounds mechanical properties |
| title | Weld Formation Mechanism and Microstructural Evolution of TC4/304 Stainless Steel Joint with Cu-Based Filler Wire and Preheating |
| title_full | Weld Formation Mechanism and Microstructural Evolution of TC4/304 Stainless Steel Joint with Cu-Based Filler Wire and Preheating |
| title_fullStr | Weld Formation Mechanism and Microstructural Evolution of TC4/304 Stainless Steel Joint with Cu-Based Filler Wire and Preheating |
| title_full_unstemmed | Weld Formation Mechanism and Microstructural Evolution of TC4/304 Stainless Steel Joint with Cu-Based Filler Wire and Preheating |
| title_short | Weld Formation Mechanism and Microstructural Evolution of TC4/304 Stainless Steel Joint with Cu-Based Filler Wire and Preheating |
| title_sort | weld formation mechanism and microstructural evolution of tc4 304 stainless steel joint with cu based filler wire and preheating |
| topic | titanium alloys stainless steel cold metal transfer intermetallic compounds mechanical properties |
| url | https://www.mdpi.com/1996-1944/12/19/3071 |
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