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2. 发明授权

US5304776A System for welding pipes 失效
标题翻译：焊管系统
公开(公告)号：US5304776A
公开(公告)日：1994-04-19
申请号：US36298
申请日：1993-03-24
申请人： Steven R. Buerkel , Victor Ballard
发明人： Steven R. Buerkel , Victor Ballard
IPC分类号： B23K9/028 , B23K9/167 , B23K9/16
CPC分类号： B23K9/0286 , B23K9/167 , B23K2201/06
摘要： An automatic welding system uses an anti-gravitational welding controller to minimize or eliminate the undercutting and concavity of the roots of the welds caused by gravitational effects. The pressure within the pipes to be welded is continually changed as the welder orbits the pipes. At the upper section of the weld, positive pressure is applied to the pipes to eliminate undercutting at the upper surface of the weld and negative pressure (vacuum) is applied to the lower section of the weld to eliminate concavity of the root of the weld. In one mode, the internal pressure within the pipes is varied as a function of the position of the orbital welder. In another mode, the arc voltage at the tip of the weld, i.e., the distance between the tip of the weld and the surface of the weld, is maintained constant by varying the pressure within the pipes. The system allows for the completion of high quality welds with less weld material, less passes, and less time. It also allows the welding to be performed by welders who are less experienced and skilled as the present welders.
摘要翻译：自动焊接系统使用反重力焊接控制器来最小化或消除由重力作用引起的焊缝根部的底切和凹陷。随着焊机绕管道的流动，焊接管内的压力不断变化。在焊缝的上部，对管道施加正压，以消除焊缝上表面的底切，并向焊缝的下部施加负压（真空）以消除焊缝根部的凹陷。在一种模式中，管道内的内部压力作为轨道焊接机的位置的函数而变化。在另一种模式中，通过改变管道内的压力，焊接尖端处的电弧电压，即焊缝尖端与焊缝表面之间的距离保持恒定。该系统允许用较少的焊接材料，较少的通过和更少的时间完成高质量的焊缝。它还允许焊接由焊工执行，这些焊工比较少经验和技术熟练，如现在的焊工。

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