通过对管道全位置熔化极气体保护焊(gas metal arc welding,GMAW)熔池图像的研究分析,发现并验证了其根焊熔池图像尖端与焊缝坡口中心位置重合的现象,依据此规律性特征,提出了一种基于熔池图像尖端信息的焊接偏差测定方法.该方法的基本...通过对管道全位置熔化极气体保护焊(gas metal arc welding,GMAW)熔池图像的研究分析,发现并验证了其根焊熔池图像尖端与焊缝坡口中心位置重合的现象,依据此规律性特征,提出了一种基于熔池图像尖端信息的焊接偏差测定方法.该方法的基本原理是,在对焊接过程熔池CCD图像进行中值滤波、小波变换、连通区域分割等图像处理后,以搜索算法测得的根焊熔池图像尖端位置信息作为焊缝坡口中心位置的坐标值,此值与焊丝中心坐标值之差即为焊接偏差量.试验证明,此方法能从根焊熔池图像中实时测定焊接偏差量,为实现机器人自动焊缝跟踪控制提供了可靠依据.展开更多
In this work, a tandem narrow gap gas metal arc welding（ GMA W） system was developed to improve the efficiency in welding of thicker materials, which are mostly used in shipbuilding and nuclear power plant. A specia...In this work, a tandem narrow gap gas metal arc welding（ GMA W） system was developed to improve the efficiency in welding of thicker materials, which are mostly used in shipbuilding and nuclear power plant. A special welding torch was desgined, where the two wires are fed through the bent contact tip to point to each side of narrow gap groove. Effect of wire distance and bent angle of contact tip on weld bead shape is studied. The experimental results show that defect free weld bead can be obtained when the wire distarwe is 5 mm and bent angle of contact tip is 10% Finally, tandem narrow gap GMAW of 65 mm thick low carbon steel was successfully carried out with one pass per layer. The obtained weld cross-section photo indicates that there is no defect of lack of side fusion or slag inclusion.展开更多
文摘通过对管道全位置熔化极气体保护焊(gas metal arc welding,GMAW)熔池图像的研究分析,发现并验证了其根焊熔池图像尖端与焊缝坡口中心位置重合的现象,依据此规律性特征,提出了一种基于熔池图像尖端信息的焊接偏差测定方法.该方法的基本原理是,在对焊接过程熔池CCD图像进行中值滤波、小波变换、连通区域分割等图像处理后,以搜索算法测得的根焊熔池图像尖端位置信息作为焊缝坡口中心位置的坐标值,此值与焊丝中心坐标值之差即为焊接偏差量.试验证明,此方法能从根焊熔池图像中实时测定焊接偏差量,为实现机器人自动焊缝跟踪控制提供了可靠依据.
文摘In this work, a tandem narrow gap gas metal arc welding（ GMA W） system was developed to improve the efficiency in welding of thicker materials, which are mostly used in shipbuilding and nuclear power plant. A special welding torch was desgined, where the two wires are fed through the bent contact tip to point to each side of narrow gap groove. Effect of wire distance and bent angle of contact tip on weld bead shape is studied. The experimental results show that defect free weld bead can be obtained when the wire distarwe is 5 mm and bent angle of contact tip is 10% Finally, tandem narrow gap GMAW of 65 mm thick low carbon steel was successfully carried out with one pass per layer. The obtained weld cross-section photo indicates that there is no defect of lack of side fusion or slag inclusion.
