研究目的
Investigating the influence of laser power, feed rate and laser wavelength on the residual stresses in the contour laser transmission welding process and the application of 2 μm laser radiation to reduce stress-cracking-susceptibility.
研究成果
The application of 2 μm laser radiation can lead to reduced stress-cracking-susceptibility in laser transmission welding of PMMA, compared to conventional welding with wavelengths of ~1 μm. The study highlights the importance of minimizing thermal gradients and optimizing welding parameters to reduce residual stresses.
研究不足
The study is limited to PMMA materials and specific laser wavelengths. The method using solvent in vapor phase for crack initiation may not be applicable to all materials or welding scenarios. The quantitative determination of residual stress magnitude is not possible with the employed method.
1：Experimental Design and Method Selection:
The study involves laser transmission welding of PMMA parts using two different laser wavelengths (980 nm and 2000 nm) to investigate their effects on residual stresses and stress-cracking susceptibility.
2：Sample Selection and Data Sources:
Commercially available extruded PMMA sheets were used, with black colored PMMA as the laser absorbing part and uncolored PMMA as the transparent part.
3：List of Experimental Equipment and Materials:
A fiber coupled diode laser (Compact Evolution, DILAS Diodenlaser GmbH) and a thulium-fiber laser (Revolix jr., LISA laser products OHG) were used for welding. A pneumatic clamping device ensured thermal contact between the parts.
4：Experimental Procedures and Operational Workflow:
Samples were welded with varying laser powers and feed rates, then exposed to xylene vapor to initiate stress cracking. Crack propagation was observed using an optical stereo microscope.
5：Data Analysis Methods:
The crack distribution around the welds was analyzed to assess the influence of welding parameters on residual stresses.
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