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为了进一步探讨聚焦气流对大功率等离子弧焊炬工作稳定性的影响,设计了两种水冷探头,对YJ-700大功率等离子焊炬(带有环形水冷聚焦罩)和通用型LH-300焊炬,在各种参数、喷嘴孔径时,弧对探头表面的径向压强分布、弧对探头的传导热及探头表面的径向温度分布进行了测定。虽然弧对探头的作用力不同于弧对熔池的作用力,但可以用来定最描述弧的刚性及穿透力。探头表面的温度分布及弧对探头的传导热,虽然并非为弧的真实径向温度分布及弧对阳极工件的传导热,但可以说明弧的热特性及阳极工件的热传导规律。试验证明,聚焦气流的存在,不但可以抑制双弧的产生,而且能使弧特性(包括压力特性及热特性)对离子气流量的变化不敏感;探头表面的温度分布对喷嘴直径的变化也不敏感,有利于焊炬的工作稳定性。
In order to further investigate the effect of focused airflow on the working stability of high-power plasma arc torch, two kinds of water-cooled probes were designed to simulate the YJ-700 high-power plasma torch (with circular water-cooled focus mask) and the universal LH-300 torch , The radial pressure distribution of the arc on the probe surface, the conduction heat of the probe on the arc and the radial temperature distribution on the probe surface were measured at various parameters, nozzle aperture. Although the force of the arc on the probe is different from the force of the arc on the weld pool, it can be used to best describe the rigidity and penetration of the arc. Although the temperature distribution of the probe surface and the conduction heat of the probe to the probe are not the real radial temperature distribution of the arc and the conduction heat of the arc to the anode workpiece, the thermal characteristics of the arc and the heat conduction law of the anode workpiece can be described. Experiments show that the existence of focused airflow can not only inhibit the generation of double arcs but also make arc characteristics (including pressure and thermal characteristics) insensitive to changes of ion gas flow rate. The temperature distribution on the probe surface also does not change the nozzle diameter Sensitive, is conducive to the work of welding torch stability.