研究目的
Investigating the effect of laser welding process energy on the joint integrity and quality between steel and aluminium in a T joint configuration.
研究成果
Laser welding was successfully transferred from lap joint to T joint configuration, producing joints with a thin Fe-Al intermetallic compound layer. The new design of the T joint creates a mechanical inter-lock between the steel and aluminium plates. Defect-free T joints were produced with minimum power density and interaction time, with the intermetallic compound layer thickness less than 5 μm.
研究不足
The technique requires further investigation of the groove geometry to improve wetting of molten aluminium on steel inside the groove and reduce cracking. Mechanical tests are needed to quantify the strength of the laser welded T joints.
1：Experimental Design and Method Selection:
Laser conduction welding was used to join DH36 steel to AA5083 aluminium alloy in a T joint configuration. The effect of process energy on joint integrity was investigated.
2：Sample Selection and Data Sources:
Low-carbon steel (grade DH36) and AA5083-H22 aluminium alloy plates with 6 mm thickness were used.
3：List of Experimental Equipment and Materials:
An IPG continuous wave fibre laser with 8000 W of maximum power was used. A milling machine was used to produce a groove on the steel plate.
4：Experimental Procedures and Operational Workflow:
The aluminium plate was inserted into a groove machined on the steel plate. Laser welding was performed with varying power densities and interaction times.
5：Data Analysis Methods:
Metallurgical characterization was performed to analyze the joint integrity, including macrostructure and microstructure observations.
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