Research Initiation Award: Scan Welding; Process Modeling and Adaptive Control

研究启动奖：扫描焊接；

• 批准号: 9209141
• 负责人: Charalabos Doumanidis
• 金额: $ 9.56万
• 依托单位: Tufts University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-01 至 1996-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9209141&HistoricalAwards=false
• 关键词: Research; Initiation; Award; Scan; Welding

Traditional welding methods with a sequentially moving, localized heat input, offer limited simultaneous control over the multiple features of weld quality and productivity. This research will focus on the invention of a novel parallel technique, scan welding, implemented by fast repetitive cycling of the torch along the weld surface to provide a regulated continuous heat distribution. This new method will produce the full bead length simultaneously, and yield longitudinally uniform thermal properties of the weld. The dynamics of scan welding will be studied by analytical and numerical modeling of its temperature, phase and stress-strain field. On this basis, a distributed adaptive control system with in-process parameter identification will be designed to modulate the torch power and motion, so as to obtain the specified thermal field. Scan welding will also be implemented on a robotic plasma welding system with thermal feedback from an infrared pyrometer, and experiments will be performed for model verification and comparison of scan welding to conventional techniques. The expected advantages include high process speed and efficiency, elimination of preheat and annealing requirements, and close simultaneous control of weld bead geometry, material microstructure and properties, and residual stresses and distortions of the joint. These benefits provide the potential for optimization of the welding productivity and quality, especially in critical and highly demanding applications.

传统的焊接方法具有顺序移动， 局部热输入，提供有限的同时控制 焊接质量和生产率的多个特征。 本研究 将集中在一个新的并行技术，扫描发明 焊接，通过焊炬沿着的快速重复循环来实现 以提供可调节连续加热 分布 这种新方法将产生完整的珠长度 同时，产生纵向均匀的热性能 的weld。 扫描焊接的动力学将通过 分析和数值模拟其温度，相位和 应力应变场 在此基础上，提出了一种分布式自适应控制 将设计一个具有在线参数识别的系统 以调节火炬的功率和运动，从而获得 指定的热场。 扫描焊接也将在 一种机器人等离子焊接系统， 红外高温计，并将进行实验的模型 扫描焊与常规焊的验证与比较 技术. 预期的优点包括高处理速度和 效率，消除预热和退火要求，以及 焊缝几何形状、材料的紧密同步控制 组织和性能，以及残余应力和 关节的扭曲。 这些好处提供了潜力， 优化焊接生产率和质量，特别是 关键和高要求的应用。