Machedon-Pisu Teodor, Machedon-Pisu Mihai
Department of Materials Engineering and Welding, Transilvania University of Brașov, B-dul Eroilor nr. 29, 500036 Brașov, Romania.
Department of Electronics and Computers, Transilvania University of Brașov, B-dul Eroilor nr. 29, 500036 Brașov, Romania.
Materials (Basel). 2025 Sep 12;18(18):4281. doi: 10.3390/ma18184281.
In many areas such as the automotive, aircraft, and building industries, the high-strength aluminum alloy Al 7075 is frequently used due to its appropriate properties as a lightweight structural material. However, due to modest weldability, it is challenging to obtain high-quality welds with suitable mechanical properties, as cracks are generated while welding. Moreover, in order to avoid post-welding heat treatments and the use of complex welding equipment, in this paper the Al 7075 alloy is welded with MIG under longitudinal vibrations by using the Al 4043 alloy as filler material. As a consequence of strengthening the HAZ through precipitation, the mechanical and structural properties of the welded joints can be improved. These are investigated both under longitudinal forced vibrations at 50 Hz and without such vibrations. The results reveal improvements in terms of reducing the risk of hot cracking, obtaining a band structure free of porosity of the welds, improving the hardness of the welds under vibrations by 8.7% to 12.5%, and improving the tensile strength of the plates welded under vibrations by 12 to 15.5% in comparison to no vibrations. In relation to other welding procedures, the proposed procedure is more cost-effective and the weld quality is improved during the welding process.
在汽车、航空和建筑等许多行业中，高强度铝合金Al 7075因其作为轻质结构材料的适当性能而经常被使用。然而，由于其焊接性一般，要获得具有合适机械性能的高质量焊缝具有挑战性，因为焊接时会产生裂纹。此外，为了避免焊后热处理和使用复杂的焊接设备，本文采用Al 4043合金作为填充材料，在纵向振动下对Al 7075合金进行MIG焊接。通过析出强化热影响区，可以改善焊接接头的机械和结构性能。对其在50Hz纵向强迫振动和无振动条件下进行了研究。结果表明，与无振动相比，在降低热裂纹风险、获得无气孔的焊缝带状组织、使振动下焊缝硬度提高8.7%至12.5%以及使振动下焊接板材的抗拉强度提高12%至15.5%等方面都有改善。与其他焊接工艺相比，所提出的工艺更具成本效益，并且在焊接过程中焊缝质量得到了提高。
