【摘要】 利用温度与变形实时测量系统,对铝合金5A12薄板氩弧焊接动态角变形过程进行了试验研究,探讨通过特征值来描述角变形动态行为。通过对温度及变形动态曲线的分析,提出了焊接动态角变形过程的两个特征值,即下挠最大值点和上翘平衡点。并采用正交试验法,研究不同焊接参数条件下动态角变形曲线的变化规律,构建焊接角变形的动态特征曲线的数学模型。结果表明,动态变形特征曲线的数学表达式能够反映焊接角变形的动态变化趋势,下挠最大值、上翘平衡值及下挠和上翘过程中曲线斜率的变化是描述动态变形曲线变化趋势的关键因素。更多还原

【Abstract】 The characteristics of dynamic welding angular distortions of aluminum alloy 5A12 with TIG welding are investigated by self-made welding dynamic temperature and distortion measuring system.With analyzing the welding thermal cycle and dynamic angular distortion curves,two characteristic values,the down warping maximum point and warping balanced point are put forward to describe the dynamic curve behavior.The changing rules of the dynamic curves under different welding parameters are investigated by means of orthogonal experiment method.Based on the results,mathematic model on the dynamic angular distortion curve is introduced.The results show the dynamic angular distortion can be expressed by the mathematic formula accurately.The down warping maximum point,warping balanced point and the slops of the curves are the key factors that characterize the dynamic angular distortion curves.更多还原