大功率双丝脉冲MIG焊双电弧干扰形成机理及双脉冲群智能优化策略

项目名称： 大功率双丝脉冲MIG焊双电弧干扰形成机理及双脉冲群智能优化策略

项目编号： No.51205136

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 吴开源

作者单位： 华南理工大学

项目金额： 24万元

中文摘要： 大功率双丝脉冲MIG焊是提高焊接生产效率的有效途径，是高效化焊接的实现方法之一，然而大电流引起双电弧干扰严重，使焊接过程不稳定，成为制约其推广应用的主要瓶颈。本项目以大电流双电弧为研究对象，对以多物理场耦合为特征的双电弧干扰规律、建模、模拟和优化进行体系研究。首先理论分析和计算双电弧的电场、磁场和流场多物理场耦合特征方程组，对双电弧的形态、运动规律及相互作用规律进行研究；其次提出双脉冲波控减小双电弧相互干扰，建立双脉冲双电弧作用力的动力学数值模拟模型；最后针对双脉冲参数多的特点，应用粒子群群智能优化策略，以双电弧相互作用力为目标函数，结合工艺试验进行数值模拟，实现双电弧双脉冲多参数优化，建立基于双脉冲的双电弧干扰定量预测模型。本项目旨在揭示大电流双电弧干扰规律和实现双电弧干扰双脉冲优化控制，对减小双电弧干扰和完善大功率双丝脉冲MIG焊系统具有重要意义，可为其设计和工程化应用提供科学依据。

中文关键词： 大功率双丝脉冲MIG焊；双电弧干扰；双脉冲；群智能；高速摄像

英文摘要： High power twin-wire pulsed MIG welding process is an effective solution to get the production efficiency increased significantly and one of the efficient welding methods. However the serious interference of twin-arc, which is caused by high-current, makes the welding process unstable and has become the prominent problems for the application of this technology. High-current twin-arc is chosen as the study object, and a thorough research on the interference law, modeling, simulation and optimization of twin-arc characterized by multi-physics coupling is presented.Firstly, theoretic analysis and calculation of multi-physics coupling character equation on electric field, magnetic and flow field of twin-arc are presented, and the shapes, movement characteristics and interaction of twin-arc are studied. Secondly, a waveform control of dual pulse is proposed to reduce the interference of twin-arc, and the dynamic and numerical simulation model of dual-pulse twin-arc is established. Finally, to aim at the character of multi-parameters of dual pulse, the numerical simulation is carried out combining with experimental investigation and a particle swarm intelligence optimization strategy is developed, which takes the interaction force as the objective function. The multi-parameters optimization of twin-arc based on dual p

英文关键词： High power twin-wire pulsed MIG welding；Twin-Arc interference；Dual pulse；Swarm intelligence；high-speed photography