Study on the inconsistency in mechanical properties of 2219 aluminium alloy TIG-welded joints
| Autor: | Jianling Song, Yue Zhao, Meng Danyang, Zhongping Zhang, Xianli Liu, Dengkui Zhang, Guoqing Wang, Quan Li, Aiping Wu |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering Gas tungsten arc welding Metals and Alloys chemistry.chemical_element 02 engineering and technology Welding Tungsten 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Indentation hardness 0104 chemical sciences law.invention chemistry Mechanics of Materials law Materials Chemistry Grain boundary 2219 aluminium alloy Composite material 0210 nano-technology Penetration depth Eutectic system |
| Zdroj: | Journal of Alloys and Compounds. 777:1044-1053 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.10.182 |
| Popis: | The strength and plasticity of 2219 aluminium alloy tungsten inert gas (TIG)-welded joints are inconsistent, which can compromise the safety of products. Both numerical simulation and experimental methods are used to study why the mechanical properties show a significant variation among 2219 aluminium alloy TIG-welded joints; the reasons can be summarized as involving geometric factors and metallurgical factors. Changes in the front weld width, the penetration depth of the capping weld, and other geometric parameters can have different effects on joints' mechanical properties. Three types of metallurgical factors can negatively affect joints' mechanical properties: i) unfavourable eutectic structure (the presence of coarsened eutectic particles and a thickened grain boundary eutectic structure in the crack initiation region of C10S+C10S welded joints; and the appearance of a continuously elongated eutectic structure close to the fusion line near the crack initiation region of C10S+CYS-welded joints); ii) significant segregation in the weld zone (WZ); and iii) decreased microhardness values in the partially melted zone (PMZ) and in the WZ. Two methods can be adopted to improve the joints' mechanical properties: i) The shapes of the welded joints can be optimized by adjusting the welding process parameters. One example is decreasing the penetration depth of the capping weld by decreasing the welding current and gas flow rate during the second pass. ii) The degree of segregation in the WZ and PMZ can be reduced by properly adjusting the welding heat input and wire feeding speed. |
| Databáze: | OpenAIRE |
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