Innovative equipment for the assembly and welding of curved bottoms onto tubes of different lengths and diameters. Like all the equipment produced by Sitec, this is equipped with numerical control for convenient management of the axes which configure the system according to the piece being processed: rotation speed, height of torch and length of tube. By oil-dynamic shifting of both lateral carriages and of the centring plates, this equipment may be used for welding operations on pieces by head-to-head joining as well as bordering between bottom and tube. The diameters admitted may vary from 500 to 1250 mm while lengths range between 1200 and 3000 mm. The processing cycle takes place as follows:
• Loading of bottoms by special loading units on both heads and insertion of the tube on the lifting unit placed in the centre of the equipment.
• Assembly of bottoms and tubes by means of the advancement of the heads and by using 48 centring plates.
• Withdrawal of centring plates and simultaneous lowering of both torches for Mig welding.
• Opening of the spindle heads and unloading of tank onto rear rollers.
For head-to-head fitting, a stitching phase takes place between the various centring plates before these are released.