Watanabe Ikuya, Baba Naoki
Department of Biomaterials Science, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, Texas 75246, USA.
Quintessence Int. 2007 Jan;38(1):e14-9.
The objective of this study was to investigate the effect of laser welding parameters (current [A], spot diameter [mm], and pulse duration [ms]) on the weld penetration depth by Nd:YAG laser into cast titanium and Ag-based and Au-based alloys.
Two cast blocks of each metal were laser welded with various parameters at their interface. The blocks were then separated, and the penetration depth into each metal was measured on the separated surface using a computer program. The data were statistically analyzed.
Increasing the current and decreasing the spot diameter increased the penetration depth into each alloy. No statistical differences in penetration depth were found for each metal among the pulse durations.
The results suggested that, regardless of the pulse duration, the current and the spot diameter in relation to the power density (W/cm2) of the laser affected the weld penetration depth into each metal. Cast titanium produced more penetration depth compared to gold alloys because of its low thermal conductivity value and high rate of laser beam absorption.
本研究的目的是调查钕钇铝石榴石激光（Nd:YAG激光）的焊接参数（电流[A]、光斑直径[mm]和脉冲持续时间[ms]）对其熔入铸造钛及银基和金基合金的熔深的影响。
每种金属的两个铸造块在其界面处以不同参数进行激光焊接。然后将这些块分开，并使用计算机程序在分开的表面上测量每种金属的熔深。对数据进行统计分析。
增加电流和减小光斑直径会增加每种合金的熔深。在不同脉冲持续时间下，每种金属的熔深未发现统计学差异。
结果表明，无论脉冲持续时间如何，与激光功率密度（W/cm²）相关的电流和光斑直径会影响每种金属的熔深。由于铸造钛的热导率值低且激光束吸收率高，与金合金相比，其产生的熔深更大。
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