研究目的
To investigate the occurrence of porosity during laser beam welding of aluminium high pressure die castings.
研究成果
The findings indicate that laser beam welding under reduced ambient pressure leads to a significant drop of the mean loss of porosity. The loss of porosity is mainly driven by a reduction of the pore size despite an increase of the number of pores. In addition, it was found that the sphericity of the pores rises when welding under reduced ambient pressure.
研究不足
The study focuses on the influence of ambient pressure on porosity during laser beam welding of aluminium high pressure die castings. The findings may not be directly applicable to other materials or welding processes.
1：Experimental Design and Method Selection:
Laser welding trails at varied ambient pressure were carried out to investigate the influence of the ambient pressure on the occurrence of porosity during laser beam welding.
2：Sample Selection and Data Sources:
Casted aluminium plates of the dimensions 260 x 150 x 4 mm made from EN AC-AlSi10MgMn(Fe) were used.
3：List of Experimental Equipment and Materials:
A solid state disk laser (TRUMPF TruDisk6002D) with a wavelength of λ = 1030 nm and a beam parameter product of BPP =
4：0 mm × mrad was used. A TRUMPF BEO D70 processing optic with a focal length of 300 mm and an aspect ratio of
5：0 was used. Experimental Procedures and Operational Workflow:
Bead on plate welds of 250 mm length were processed with a welding speed of 2 m/min. The welding trials were carried out with four different combinations of ambient pressure (1000 hPa / 100 hPa / 10 hPa /
6：1 hPa) and laser power (3,2 kW / 2,96 kW / 2,8 kW / 2,8 kW). Data Analysis Methods:
From each weld bead, seven test specimen of 13 mm width were taken and tested by x-ray computed tomography (XCT) analysis.
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