Study on Cracking Behaviour in Pulsed Nd:YAG Laser Welding of 2024 Aluminium Alloy
Cracking behavior in pulsed laser welding of AA2024 is investigated. It is established that the weld metal can be divided in two zones with respect to cracking behavior. The first zone corresponds to the weld metal nucleated and grown on the wrought base metal. The second zone corresponds to that part of the weld pool which is grown on the weld metal of the previous spot. It is established that the partially melted zone between the weld metal and the wrought base metal acts as a strong initiation site for solidification cracks. However, the partially melted zone of the fusion line between two consecutive weld spots is immune to acting as initiation site for solidification cracking. Overall, the study shows that partially melted zone microstructure and its relation to the welding stresses has an overriding effect on what is known as solidification cracking in the weld metal of AA2024.
Keywords: laser welding: solidification cracking: partially melted zone: liquation cracking: wrought aluminium
alloy.
فایل PDF :   Study on Cracking Behaviour in Pulsed Nd:YAG Laser Welding of 2024 Aluminium Alloy    |    2015/10/18