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Characteristics of high-power CO_2 laser welding and porosity suppression mechanism with nitrogen shielding. Study of high-power laser welding phenomena

机译：大功率CO_2激光焊接特性及带氮屏蔽的气孔抑制机制。大功率激光焊接现象研究

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摘要

This article describes an investigation of deep penetration welding with a 2(1 kW CO_2 laser welding facility. The effects of various welding parameters on plasma generation penetration depth, and porosity are examined. The results obtained may be summarized as follows: 1 The penetration depth increases with a decreasing welding speed, showing a virtually constant value at a welding speed of less than 8.33 mm/sec. This is due to the greater effect of laser absorption caused by metal plasma generated inside the keyhole in the low-speed range. 2 Porosity occurs more readily with an increasing penetration depth, being particularly pronounced when the focal position is above the workpiece. 3 When nitrogen shielding is used, the penetration depth sharply decreases under the effect of periodic nitrogen plasma generation, although porosity is effectively prevented. 4 The results obtained during laser welding with pulse modulation of the laser power intended to model periodic nitrogen plasma generation show a porosity reduction effect to be found as well as good scope available for porosity suppression through appropriate pulse modulation of the laser power. 5 The porosity suppression effect of nitrogen shielding is due to the two effects of nitrogen in solid solution in molten iron and the laser power modulation effect of periodic nitrogen plasma generation.
机译：本文介绍了使用2（1 kW CO_2激光焊接设备）进行深熔焊的研究，研究了各种焊接参数对等离子体生成熔深和孔隙率的影响，得出的结果可归纳如下：1熔深随着焊接速度的降低，其增加，在低于8.33 mm / sec的焊接速度下显示出几乎恒定的值，这是由于低速范围内钥匙孔内部产生的金属等离子体对激光吸收的影响更大。孔隙率随渗透深度的增加而更容易出现，当焦点位于工件上方时尤为明显3使用氮屏蔽时，尽管能有效防止孔隙，但在周期性产生氮等离子体的作用下，渗透深度会急剧下降4在激光焊接过程中，通过对激光功率进行脉冲调制获得的结果用于模拟周期性氮等离子体g通过对激光功率进行适当的脉冲调制，该方法显示出发现的降低孔隙率的效果以及抑制孔隙率的良好范围。 5氮屏蔽的孔隙抑制作用是由于铁水中固溶氮的两种作用以及周期性氮等离子体产生的激光功率调制作用所致。

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