Local energy adjustment mechanism in a novel laser-enhanced plasma arc heat source
Local energy adjustment mechanism in a novel laser-enhanced plasma arc heat source
复制标题
新型激光增强等离子弧热源中的局部能量调节机制
DOI：
10.1016/j.ijthermalsci.2021.107081
复制
发表时间：
2021-05-28
影响因子：
4.5
通讯作者：
Chen, Shujun
中科院分区：
文献类型：
--
作者：
Jiang, Fan;Wang, Shuo;Chen, Shujun
本研究旨在提高等离子弧的局部能量，以满足厚板焊接的要求。为此，提出了一种新型的激光与等离子体电弧同轴布置的复合热源--激光增强等离子体电弧（LPA）。这种特殊的焊枪通过一个管状钨电极将两种光源结合起来，利用激光加热局部等离子弧来改变能量分布。通过测量等离子弧的三维温度场，研究了激光对等离子弧能量分布的影响以及等离子弧对激光的吸收特性。建立了数值模拟模型，揭示了其影响机理.结果表明，等离子弧中存在一个激光吸收率较高的区域，等离子弧压力和温度对激光吸收率有明显的影响。激光高吸收区的位置和大小随焊接工艺参数的变化而变化，这是由于等离子弧的温度和压力发生了变化。研究结果还表明，通过改变激光能量和等离子弧参数，可以局部调节混合源能量，增加等离子弧的有效火焰长度，有利于厚板焊接，本研究旨在提高等离子弧的局部能量，以满足厚板焊接的要求。为此，提出了一种新型的激光与等离子体电弧同轴布置的复合热源--激光增强等离子体电弧（LPA）。这种特殊的焊枪通过一个管状钨电极将两种光源结合起来，利用激光加热局部等离子弧来改变能量分布。通过测量等离子弧的三维温度场，研究了激光对等离子弧能量分布的影响以及等离子弧对激光的吸收特性。建立了数值模拟模型，揭示了其影响机理.结果表明，等离子弧中存在一个激光吸收率较高的区域，等离子弧压力和温度对激光吸收率有明显的影响。激光高吸收区的位置和大小随焊接工艺参数的变化而变化，这是由于等离子弧的温度和压力发生了变化。研究结果还表明，通过改变激光能量和等离子弧参数，可以局部调节混合源能量，增加等离子弧的有效火焰长度，有利于厚板焊接。
This study aims to enhance the localized energy of the plasma arc to meet the requirement of thick metal plate welding. To achieve this, a novel hybrid heat source by coaxial arranging the laser and plasma arc was proposed, named laser-enhanced plasma arc (LPA). This special torch combines the two kind sources by a tubular tungsten electrode which the laser passes through, use laser to heat localized plasma arc to modify the energy distribution. The three-dimensional temperature field was measured to clarify the effect of laser on plasma arc energy distribution and the absorption characteristics of laser by plasma arc. The numerical simulation model was established to reveal the influence mechanism. Results show that there is a high laser absorption region in the plasma arc, and it exists obvious effects of plasma arc pressure and temperature on laser absorption rate. The location and size of the high laser absorption region change as the welding parameters because the temperature and pressure of plasma arc change. The results also substantiate that the hybrid source energy can be adjusted locally to increase the effective flame length of the plasma arc by changing the laser energy and plasma arc parameters, which is beneficial for thick metal plate welding.This study aims to enhance the localized energy of the plasma arc to meet the requirement of thick metal plate welding. To achieve this, a novel hybrid heat source by coaxial arranging the laser and plasma arc was proposed, named laser-enhanced plasma arc (LPA). This special torch combines the two kind sources by a tubular tungsten electrode which the laser passes through, use laser to heat localized plasma arc to modify the energy distribution. The three-dimensional temperature field was measured to clarify the effect of laser on plasma arc energy distribution and the absorption characteristics of laser by plasma arc. The numerical simulation model was established to reveal the influence mechanism. Results show that there is a high laser absorption region in the plasma arc, and it exists obvious effects of plasma arc pressure and temperature on laser absorption rate. The location and size of the high laser absorption region change as the welding parameters because the temperature and pressure of plasma arc change. The results also substantiate that the hybrid source energy can be adjusted locally to increase the effective flame length of the plasma arc by changing the laser energy and plasma arc parameters, which is beneficial for thick metal plate welding.