研究目的
Investigating the effect of pulsed Nd:YAG laser parameters and preheating on the creation of hot cracks in the 6061-T6 aluminum alloy.
研究成果
The research concluded that increasing the duration time to 10 ms resulted in decreasing hot cracking, and reducing the pulse frequency to 1 Hz led to the complete removal of the cracks. However, increasing the preheating temperature resulted in increased hot cracking. The study also highlighted that dendrite size, solidification rate, thermal gradient, and grain size are not the only parameters that affect the creation of hot cracks; the precipitation of low-temperature eutectic compounds, the thermal stresses caused by the temperature distribution in the welding position, and the formation of hydrogen porosities are also significant factors.
研究不足
The study focused on the 6061-T6 aluminum alloy and specific laser welding parameters. The findings may not be directly applicable to other materials or welding methods.
1：Experimental Design and Method Selection:
The study involved welding a commercial aluminum-magnesium-silicon alloy sheet, AA6061, using an 80 W, Nd:YAG pulsed laser machine in the form of bead-on-plate and partial penetration. Preheating was carried out by an electrical resistance heating pad at 100, 200, and 300 °C.
2：Sample Selection and Data Sources:
A commercial aluminum-magnesium-silicon alloy sheet, AA6061, with a thickness of
3：8 mm was used. List of Experimental Equipment and Materials:
Nd:YAG pulsed laser machine, electrical resistance heating pad, optical microscope, scanning electron microscope (SEM), Clemex Image Analysis software, energy dispersive spectroscopy (EDS), ANSYS APDL software.
4：Experimental Procedures and Operational Workflow:
The welding parameters were varied to investigate their effect on hot crack formation. The samples were examined by optical and SEM, and tensile tests were performed.
5：Data Analysis Methods:
The effects of the laser welding parameters and preheating on the formation of hot cracking were examined by an optical microscope as well as a scanning electron microscope (SEM). The Clemex Image Analysis software was used to measure the grain size and the inter-dendritic spacing. Energy dispersive spectroscopy (EDS) was used to quantify the elements which precipitated in the inter-dendritic spaces. Tensile stresses caused by welding were simulated by the ANSYS APDL software.
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