水下焊接参数相关性分析及其电弧稳定性研究

Correlation Analysis of Process Parameters and Arc Stability of Underwater Welding

在高压舱内进行了不同水深的水下湿法药芯焊丝焊接(FCAW)试验,以电弧电压差异系数的倒数作为衡量电弧稳定性的指标,分析了不同水深条件下电弧电压与焊接电流之间的相关性对电弧稳定性的影响,并从送丝-熔化系统的角度探讨了电压与电流的相关性对电弧稳定性的影响规律;利用二次函数拟合电弧稳定性指标与电弧电压之间的关系,得到最佳的电压与电流关系.结果表明:最佳的水下湿法FCAW的电压与电流关系曲线呈上升的变化特性,随着水深增加,FCAW需要更高的电弧电压;水下湿法FCAW的电弧稳定性取决于电压与电流的相关性,而并非简单地随着水深的增加而下降;水深对电弧稳定性的影响主要表现在电压与电流相关性的不同;随着水深增加,相同焊接电流所需的电弧电压相应地增大.

Underwater wet flux-cored arc welding （FCAW） experiments were conducted in a hyperbaric chamber which was used to simulate different water depths. Relative standard deviation reciprocals of arc voltage were used as an index of welding arc stability. The influences of correlations between arc voltage and welding current at different water depths on arc stability were analyzed. From the point of view of the wire feeding - melting system, the influences of voltage and current correlations on arc stability were analyzed. The correlations of arc stability and arc voltage were numerically fitted by a second order function and then the optimal correlations of arc voltage and welding current were obtained. The results show that the optimal correlation curves of arc voltage and welding current for underwater wet welding are a series of ascending curves, which go upward with the increase in water depth. The arc stability depends on the cor- relations of arc voltage and welding current, and does not simply decline with the increase in water depth. The are voltage corresponding to a single welding current of underwater wet welding should be increased as the water depth increases.