铝合金电弧增材制造焊道宽度尺寸预测

文中首先采用同一组焊接参数,在四种厚度基板上进行单道20层铝合金薄壁试样成型,发现不同厚度基板下试样稳定区的焊道宽度相同. 基于此结论,利用二次通用旋转组合方法设计试验样本,通过二次回归方程建立工艺参数(焊接电流、焊接速度、送丝速度、层间温度)与成型试样稳定区域焊道宽度尺寸预测模型,经验证发现模型预测效果较好. 结果表明,影响焊道宽度的主要因素有焊接电流、焊接速度和层间温度. 当电流小于95 A时,参数对焊道宽度的影响顺序为:电流大于焊接速度大于层间温度;当电流大于95 A时,顺序变为:电流大于层间温度大于焊接速度. 同时,焊接电流和层间温度间存在交互作用.

Width prediction of aluminium alloy weld additively manufactured by TIG arc

Four multi-layer single aluminum alloy beads using the same welding parameters were formed on substrates with four kinds of thickness by TIG arc. It is found that deposited metal width in stable region of different samples was basically unchanged. Based on this phenomenon, the experimental samples were designed using quadratic general rotary unitized design method and the model between process parameters (welding current, welding speed, wire feed speed and inter-layer temperature) and deposited metal width of stable region was established. The validation results show that the model has good prediction accuracy. Furthermore, it also reveals that the welding current, welding speed and inter-layer temperature were the main influential factors on deposited metal width. Among them, the welding current had the most influential effect, and then the welding speed and inter-layer temperature, successively. In addition, the welding speed and inter-layer temperature had interactive effects on deposited metal width.