| 摘要 |
A novel orbital welder includes a body defining a tube passage, a weld tip, a rotor, a light source disposed to emit light toward the tube passage such that the emitted light will impinge upon one or more tubes placed in the tube passage, and a detector to detect the light emitted by the light source from the tube passage. The intensity of the detected light depends on the position of the tube. The detector can either be disposed to detect light reflected by the tube(s) or light transmitted past the tube(s). A method is also disclosed for aligning tubes in an orbital welder including the steps of emitting light from the light source into the tube passage, monitoring the light from the tube passage with the detector, and providing a signal indicative of the position of the tube(s) based on the intensity of the detected light.
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