In this study, the influence of increasing the ambient pressure on the penetration of pure titanium during fiber spot laser welding was studied. The results indicated that the penetration of pure titanium decreased significantly with an increase in ambient pressure. Under the experimental conditions in this study, when the ambient pressure increased from 0.1 to 1.8 MPa, the penetration changed from 3.6 to 1.2 mm, decreasing by approximately 67%. A high-speed camera and spectrometer were used to analyze the mechanism of the sharp decline in penetration. First, the rate of plasma expansion and the cross-section area of pure titanium under different ambient pressures were observed using a high-speed camera. Subsequently, a spectrometer was used to detect the plasma intensity of pure titanium during laser welding under different ambient pressures. Finally, the influence of changes in environmental pressure on the dynamic behavior of a pure titanium molten pool was studied by using high-speed photography and “glass-metal composite samples”. The results of this research could help in enriching the theory regarding laser processing under hyperbaric conditions and develop laser manufacturing technology for offshore engineering structures.

在这项研究中，研究了在光纤点激光焊接过程中增加环境压力对纯钛熔深的影响。该 结果 表明 随着环境压力的增加，纯钛的渗透率显着下降。在本研究的实验条件下，当环境压力从0.1 MPa增加到1.8 MPa时，渗透率从3.6改变为1.2 mm，降低了约67％。高速相机和光谱仪用于分析渗透率急剧下降的机理。首先，使用高速照相机观察在不同环境压力下的纯钛的等离子体膨胀率和横截面积。随后，使用光谱仪在不同环境压力下检测激光焊接过程中纯钛的等离子体强度。最后，利用高速摄影和“玻璃-金属复合材料样品”研究了环境压力变化对纯钛熔池动力学行为的影响。这项研究的结果可能有助于丰富有关高压条件下的激光加工的理论，并为海上工程结构开发激光制造技术。