研究目的
To understand the microstructural evolution during pulsed laser welding of dual phase steel to aluminium alloy and to control the formation of brittle intermetallic phases.
研究成果
Under optimal laser processing conditions, the weld penetration depth and width were achieved with controlled formation of intermetallic phases. The presence of hard and brittle Fe2Al5 and FeAl3 intermetallic phases increased the microhardness at the weld interface, while the entrapment of zinc vapor resulted in porosity formation.
研究不足
The formation of brittle intermetallic phases and porosity in the weld zone due to the entrapment of zinc vapors during welding.
1：Experimental Design and Method Selection:
Lap joining of aluminium 6061 and dual phase (DP 600) steel was carried out in pulse welding mode using a high power diode laser. The effect of laser parameters (laser power, scanning speed and pulse duration) on the microstructural evolution was studied.
2：Sample Selection and Data Sources:
Coupons size of 120 mm × 40 mm (L × W) were used, with DP 600 steel on top and Al 6061 at the bottom.
3：List of Experimental Equipment and Materials:
A 6 kW high power fiber-coupled diode laser of wavelength 980 nm and laser beam diameter of 1.5 mm was used. Argon (Ar) was used as a shielding gas.
4：5 mm was used. Argon (Ar) was used as a shielding gas.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The experiments were carried with the pulse duration of 10 ms, 50 ms, 100 ms for a fixed peak power (4 kW) and scanning speed (5 mm/s).
5：Data Analysis Methods:
Microstructural characterization was done using scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy. Micro-hardness testing was performed to evaluate the mechanical properties.
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