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Active In-Process Control and Fabricating Precision Improvement of Weld Distortion by Using Temperature Distribution Control

利用温度分布控制主动过程控制和提高焊接变形的制造精度

基本信息

批准号：
17360418
负责人：
MOCHIZUKI Masahito
金额：
$ 9.22万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360418/
关键词：
weld distortion temperature distribution distortion control fabricating precision welded structure in-process control welded joint residual stress

项目摘要

It is well known that evaluating welding distortion and residual stress is important in order to assure material weldability, structural fabricability, and structural integrity. Prediction of welding distortion and its reduction are essential in order to control dimensions and reduce the fabrication cost of welded structures. Therefore, from the viewpoint of manufacturing efficiency, in-process control of welding distortion is more desirable than post-welding rectification or other methods. There are many methods for predicting welding distortion and residual stress, and they are useful for developing an in-process method for controlling weld distortion and residual stress. Welding distortion and residual stress can be calculated under various welding conditions and for various configurations of welded structures by the thermal elastic-plastic analysis. Methods using mechanical prestraining, cooling, optimizing the welding sequence, or using vibration have been developed for residual s … More tress control in welding. Conventional in-process control of weld distortion is performed by using restraint, elastic prestraining, preheating, preheating or/and stretching, or heat control by cooling. These methods have been applied to actual welded structures, but the reduction mechanism-of welding distortion has not been completely studied because most of these techniques were only experientially established for specific conditions. The easiest way to reduce welding distortion is in-process heat control, when both the equipments needed to prevent distortion and the applicability to general purpose are considered. Therefore, in-process control of welding distortion by using a heating or cooling source in addition to the welding torch is considered to be very practical for actual use. The effectiveness of the in-process controlling method is verified by experiment and by three-dimensional thermal elastic-plastic finite element analysis in a welded joint. The appropriate conditions are determined through studying the mechanism by which welding distortion is reduced, and the effectiveness of the in-process method during welding is finally validated. Less

众所周知，评估焊接变形和残余应力对于确保材料的可焊接性、结构可制造性和结构完整性非常重要。为了控制焊接结构的尺寸和降低制造成本，焊接变形的预测和减小是必不可少的。因此，从制造效率的观点来看，焊接变形的过程中控制比焊接后矫正或其它方法更理想。预测焊接变形和残余应力的方法有很多，这些方法对于开发控制焊接变形和残余应力的在线方法是有用的。通过热弹塑性分析，可以计算各种焊接条件下和各种结构形式的焊接变形和残余应力。采用机械预应变、冷却、优化焊接顺序或振动等方法， ...更多信息焊接应力控制焊接变形的常规过程中控制通过使用约束、弹性预应变、预热、预热或/和拉伸、或通过冷却的热控制来执行。这些方法已被应用于实际的焊接结构，但减少焊接变形的机制还没有完全研究，因为大多数这些技术只是经验建立了特定的条件。当既考虑到防止变形所需的设备又考虑到通用性时，减少焊接变形的最简单方法是过程热控制。因此，除了焊枪之外，通过使用加热源或冷却源对焊接变形进行过程中控制被认为对于实际使用是非常实用的。通过试验和焊接接头三维热弹塑性有限元分析，验证了该过程控制方法的有效性。通过对减小焊接变形机理的研究，确定了合适的工艺条件，验证了该方法的有效性。少