基于多点柔性支撑的钛合金激光焊接变形控制  

Weld distortion control in laser welding of T-joint titanium alloy based on multi-point flexible fixture

作　　者：肖珺[1] 雷一鼎 陈树君[1] 芦苇 何恩光 XIAO Jun;LEI Yiding;CHEN Shujun;LU Wei;HE Enguang(En-Engineering Research Center of Advanced Manufacturing Technology for Automotive Components,Ministry of Education,Beijing University of Technology,Beijing,100124,China;Science and Technology on Power Beam Processes Laboratory,AVIC Manufacturing Technology Institute,Beijing,100024,China)

机构地区：[1]北京工业大学,汽车结构部件先进制造技术教育部工程研究中心,北京100124 [2]中国航空制造技术研究院,高能束流加工技术重点实验室,北京100024

出　　处：《焊接学报》2022年第8期8-12,I0003,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51975014);高能束流加工技术重点实验室开放课题.

摘　　要：钛合金带筋壁板类T形结构常见于航空制造领域,其激光焊接工艺已经比较成熟.但是即便在激光高速焊接过程热输入已经很低,仍然会存在一定的焊后角变形.由于航空制造的高精度要求,需要施加额外的主动控制以最大限度减小此类角变形.文中提出并验证了基于可编程多点柔性支撑的主动变形控制方法.针对传统刚性装夹、预置应力不适应于弱刚性带筋壁板结构的问题,设计了一套以STM32单片机为主控,直线电动推杆为执行机构的多点柔性支撑装置.结果表明,可在焊接过程实时监测当前支撑位置的受力状态,并进行动态调节,从而达到有效抑制焊接角变形的效果.Titanium alloy T-shape joints are commonly employed in the field of aircraft manufacturing, and its laser welding process is relatively mature. However, even if the heat input in the high-speed laser welding process is already relatively low, there will still be a certain degree of deformation after welding. Due to the high-precision requirements in the aircraft manufacturing, the angular distortion of welded sheets needs to be further reduced, so that additional active control would be necessary to apply to minimize such angular deformation. In this paper, an active deformation control method based on programmable multi-point flexible supports is proposed and verified. For traditional rigid clamping, the preset stress is not suitable in view of the problem of weakly rigid ribbed thin structure. A multi-point flexible support device with micro-controller and linear electrical actuator is designed in this study, which can monitor and adjust the force of the current support position in real time during the welding process.The welding deformation thus could be effectively reduced.

关 键 词：激光焊接 T形接头 变形控制 多点柔性支撑 

分 类 号：TG444[金属学及工艺—焊接]