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本文通过大量的水下厚板切割工艺试验和拍摄的切割电弧电压、电流示波图的分析,发现了切割过程赋于割丝熔化的某些特征,提出了厚板熔化极水下切割过程的两种模式——拉锯式切割和凿掘式切割。从理论上分析了拉锯式切割过程的割丝、母材的熔化速度与切割规范参数的关系,闸明了提高切割铜板厚度的技术途径和受到的限制。最后阐述了就改变喷水方法及喷水压力等参数进行工艺试验的情况和提高水下切割质量的措施,使熔化极水喷射水下切割炭素钢板的厚度超过了30毫米,达到45毫米。
In this paper, we analyzed the cutting arc voltage and current oscillograms which were obtained from a large number of underwater heavy plate cutting processes and shots, and found some characteristics of cutting wire melting. In addition, Two modes - saw type and cut type. The relationship between the cutting speed of the sawing wire and the base material and the cutting parameters is analyzed theoretically. The technical approaches and the limitations are raised to improve the thickness of the copper plate. In the end, the process of changing the method of water injection and the pressure of water jet, and the measures to improve the quality of underwater cutting are described. The thickness of underwater cutting carbon steel plate is more than 30 mm and 45 mm.