Benefits of optogalvanic effect and beam shaping for laser stabilized GMA welding
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摘要: 为了开发和改进激光诱导稳定焊接加工技术，需要通过激光辐射使电弧的导电率达到最大值。光电偶效应是控制该过程的主导因素，该过程的优化将会保证电弧的稳定性。光电偶效应提高了等离子体粒子电离的概率，从而提高了电弧的导电率。激光光子和氩原子之间的电子-原子碰撞相互作用产生了带电粒子。电离率越高，电弧的导电率就越高。为了充分利用光电偶效应，我们还应考虑工件上的光束焦点位置、光束形状和激光波长因素。Abstract: To develop and refine the laser guided and stabilized(LGS) welding process, the conductivity of the electric arc must be maximized using laser radiation. The optogalvanic effect(OGE) is the leading factor in controlling it, and if optimized it will lead to the stabilization of the electric arc. The OGE raises the probability of ionization of the particles in the plasma, and thus, the conductivity of the electric arc. The interaction between the photons of the laser and the Argon atoms through electron-atom collisions create charged particles. The higher the rate of ionization is, the higher the conductivity of the electric arc. Many tests were conducted to discover how to make best use of this effect. The position of the focus of the beam in relation to the work piece, the shape of the beam, and the laser wavelength used were all taken into account.
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