The PEMA Robotized Branch Pipe Submerged Arc Welding Station is a unique welding station for inside welding of branches of pressure vessels. The welding groove is of a non-radial saddle shape, therefore welding is not possible to perform by traditional mechanization methods – there was a specific need for a more flexible solution and robotized welding station.
The robotized welding station has a special gear drive cradle rollerbeds by which the moving and shifting of a work piece is extremely accurate for welding over 100 welding runs (layers).
The actual programming of the robot is made by parametrized PEMA WeldControl 300 system. The welding groove is machined and fitted in place before adjusting on the welding station. In welding of this particular working piece, nominal parameters are known, but due to the extra thick material of the pressure vessel, the welding groove can vary a lot in the limits of tolerances.
The scanning track is first created parametrically in PEMA WeldControl 300, then the groove volume is measured with a laser detector. Based on the measurement results PEMA WeldControl 300 system creates a map of welding runs that in turn creates robot welding tracks.
The customer, Director of Investments and Development of Company Pedrozavodmash Mr. Arkadij Smirnov, says that the use of the robot programming is very easy and user-friendly. “With a couple of clicks you can get over a hundred runs with multi-seam welding program!”
Thanks to the laser measurement the groove is filled evenly and the programs do not need to be modified due to the volume changes. The robot station is boosted by a 50 kg payload Yaskawa Motoman MH50 and Lincoln Electric AC/DC 1000 SD, PEMA designed submerged arc torch and welding flux recycling.
Mr. Smirnov says that the main benefit of PEMA welding station is that ”It can make the whole welding process from the start to the end without interruptions.”Pedrozavodmash has achieved tremendously good results with the welding station. We completed the welding of the work piece with the total of 130 welding runs. And that is the real increase in productivity – without any hurry, we completed it in 5 working days instead of 1,5 months which we did previously with manual labour force! We couldn’t be more satisfied!”
Additionally the PEMA solution substantially improved the working safety of workers. The young operators are especially interested in PEMA robotized welding station for the new technology, programs and the new way to weld.