单道多层电弧增材制造成形控制理论分析

Research on forming control for single-pass multi-layer of WAAM

文中采用冷金属过渡(CMT)技术,围绕船用高强钢的电弧增材制造(WAAM)开展研究.分析不同比例的保护气体对单道单层形貌尺寸的影响.结果表明,单道单层的润湿铺展能力随着保护气中CO2含量的增加而提高,并建立了能够准确预测80%Ar+20%CO2混合气体保护下单道单层截面轮廓的全周期余弦函数模型.依据单道多层电弧增材的成形特点,利用面积关系并根据几何形貌建立了单道多层抬升量h的预测模型,抬升量h预测值的相对误差不超过3.50%.通过建立抬升量预测模型,为单道多层的电弧增材成形控制提供了理论支撑.

The wire&arc additive manufacturing(WAAM)of cold metal transfer(CMT)for high-strength marine steel was studied.By analyzing the influence of different proportion of shielding gas on the morphology of single-pass single-layer,the results showed that the wetting capacity of single-pass single-layer increases with the increase of CO2 in the shielding gas.And a full-period cosine function prediction model was established,which could accurately predict the section profile of single-pass single-layer under 80%Ar+20%CO2 shielding gas.According to the forming characteristics of single-pass multi-layer,a prediction model for single-pass multi-layer uplift distance h was established based on the area relationship and geometric morphology.The relative error of the predicted value of uplift distance h was less than 3.50%.By establishing the uplift distance model,it provided theoretical support for single-pass multi-layer of wire&arc additive manufacturing.