Unlike handheld gauging, in which narrow gap levels are difficult to measure, the laser vision sensor is precise. The V Bevel machine is placed in the pipe end, and the adaptive laser vision is driven around the pipe end using a stepper motor, an accelerometer to provide a reference to a start/stop position for the measurement data. The start/stop positions and the rate at which the measurement is taken are fully programmable.
If the bevel fails to meet the specifications, it can be re-beveled immediately. Typically, beveling is not in the critical path, so no loss in production results from re-beveling. However, once in the firing line, non-specification bevels that are found just prior to root pass welding can have a dramatic effect on production because the pipe has to be re-beveled in the critical path. Other problems that can be prevented are root pass defects resulting from non-specification bevels. In offshore and spoolbase applications where repairs to the weld are in the critical path, this can have significant effects.