Porosity Formation in Thin Welded Joints of Al–MG–LI Alloys
This work is about the study of the correlation of pore formation in welded joints of Al–MG–LI alloy with zirconium additives with the state of the base metal, thermal vacuum treatment, and welding technologies MIG and EBW. Metallographic analysis has been carried out, the phase composition of the a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/1/348 |
| _version_ | 1797498397519773696 |
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| author | Tatyana Olshanskaya Elena Fedoseeva |
| author_facet | Tatyana Olshanskaya Elena Fedoseeva |
| author_sort | Tatyana Olshanskaya |
| collection | DOAJ |
| description | This work is about the study of the correlation of pore formation in welded joints of Al–MG–LI alloy with zirconium additives with the state of the base metal, thermal vacuum treatment, and welding technologies MIG and EBW. Metallographic analysis has been carried out, the phase composition of the alloy and weld metal has been investigated, and thermal cycles of welding have been calculated, allowing to estimate the residence time of metal in the alloying zone and weld metal in the liquid state. The nature of the allocation of strengthening fine-dispersed phases in the welded joints of the alloy has been determined. The regularity and character of pore formation in welded joints depending on the applicable thermal vacuum treatment (TVT) and welding technology have been revealed. It was established that TVT with subsequent hardening and aging has no effect on the phase composition of the alloy. However, this type of treatment contributes to the formation of a more homogeneous and uniform nature of the separation of fine-dispersed strengthening phases. It was revealed that the MIG technology (metal with and without TVT) is characterized by a large length of the fusion zone, the high residence time of metal in the fusion zone and weld metal in the liquid state, and the formation of pores. Phase formation in the temperature range of the beginning and end of the alloy crystallization occurs not only in the weld at the final stage of crystallization but also in the fusion zone, which may induce pore formation, whereas EBW welding shows the opposite trend and no pores. It was found that EBW technology prevents pore formation and makes it possible to obtain welded joints of 1420 Al alloys of the required quality. |
| first_indexed | 2024-03-10T03:32:52Z |
| format | Article |
| id | doaj.art-721763ec425d4bde917fc7891253199a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:32:52Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-721763ec425d4bde917fc7891253199a2023-11-23T11:51:53ZengMDPI AGMaterials1996-19442022-01-0115134810.3390/ma15010348Porosity Formation in Thin Welded Joints of Al–MG–LI AlloysTatyana Olshanskaya0Elena Fedoseeva1Department of Welding Production, Metrology and Technology of Materials, Perm National Research Polytechnic University, 614990 Perm, RussiaDepartment of Welding Production, Metrology and Technology of Materials, Perm National Research Polytechnic University, 614990 Perm, RussiaThis work is about the study of the correlation of pore formation in welded joints of Al–MG–LI alloy with zirconium additives with the state of the base metal, thermal vacuum treatment, and welding technologies MIG and EBW. Metallographic analysis has been carried out, the phase composition of the alloy and weld metal has been investigated, and thermal cycles of welding have been calculated, allowing to estimate the residence time of metal in the alloying zone and weld metal in the liquid state. The nature of the allocation of strengthening fine-dispersed phases in the welded joints of the alloy has been determined. The regularity and character of pore formation in welded joints depending on the applicable thermal vacuum treatment (TVT) and welding technology have been revealed. It was established that TVT with subsequent hardening and aging has no effect on the phase composition of the alloy. However, this type of treatment contributes to the formation of a more homogeneous and uniform nature of the separation of fine-dispersed strengthening phases. It was revealed that the MIG technology (metal with and without TVT) is characterized by a large length of the fusion zone, the high residence time of metal in the fusion zone and weld metal in the liquid state, and the formation of pores. Phase formation in the temperature range of the beginning and end of the alloy crystallization occurs not only in the weld at the final stage of crystallization but also in the fusion zone, which may induce pore formation, whereas EBW welding shows the opposite trend and no pores. It was found that EBW technology prevents pore formation and makes it possible to obtain welded joints of 1420 Al alloys of the required quality.https://www.mdpi.com/1996-1944/15/1/348aluminum alloypore formationthermal vacuum treatmentwelded jointwelding technologythermodynamic calculation |
| spellingShingle | Tatyana Olshanskaya Elena Fedoseeva Porosity Formation in Thin Welded Joints of Al–MG–LI Alloys Materials aluminum alloy pore formation thermal vacuum treatment welded joint welding technology thermodynamic calculation |
| title | Porosity Formation in Thin Welded Joints of Al–MG–LI Alloys |
| title_full | Porosity Formation in Thin Welded Joints of Al–MG–LI Alloys |
| title_fullStr | Porosity Formation in Thin Welded Joints of Al–MG–LI Alloys |
| title_full_unstemmed | Porosity Formation in Thin Welded Joints of Al–MG–LI Alloys |
| title_short | Porosity Formation in Thin Welded Joints of Al–MG–LI Alloys |
| title_sort | porosity formation in thin welded joints of al mg li alloys |
| topic | aluminum alloy pore formation thermal vacuum treatment welded joint welding technology thermodynamic calculation |
| url | https://www.mdpi.com/1996-1944/15/1/348 |
| work_keys_str_mv | AT tatyanaolshanskaya porosityformationinthinweldedjointsofalmglialloys AT elenafedoseeva porosityformationinthinweldedjointsofalmglialloys |