Newly Developed Technique to Eliminate Hot Cracking with Electromagnetic Vibration for Joining of 2024 Aluminum Alloy

In this study, the effect of electromagnetic vibration on joining of aluminum alloy 2024 was investigated. Simultaneously applying a static magnetic field and alternating electrical current passing through a conductor produced electromagnetic vibration. Joining was accomplished using constant electric current (60 A) and the magnetic flux of 75, 110, and 145 mT in the presence of argon gas. After joining, samples were cooled first by argon gas as a shielding gas and then by water. The microstructure and mechanical properties of the welded samples were studied for different electromagnetic vibrations. The optimum microstructure and mechanical properties were obtained when applied electromagnetic vibration was produced at 60 A and 145 mT. The average particle size of the resulting dendrites when welding was done using the optimum conditions was approximately 65 µm. EMV technique significantly reduced the occurrence of hot cracking.