This fit-up rotator is mainly composed of one power rotator, one idler rotator and two idler hydraulic fit-up rotators. Vessel is welded on this rotator, till get to required length. First vessel lay on power rotator and idler rotator, second vessel lay on two idler hydraulic fit-up rotator. When spot welding two vessels, the rotator moving on rail, and then holding up two vessels. Manipulator finished inner and outer circumferential seam welding. And then add more vessels, till last vessel is welded, the whole vessel is finished welding.
Hydraulic fit-up rotator has hydraulic up-down device, it can moving on rail. Power rotator is controlled by inverter which control AC motor and speed reducer to drive roller turning.
First step，lay first vessel on power rotator side；
Second step，lay second vessel one idler rotator side, then can realize fit-up welding through adjust fit-up rotator；
Third step，manipulator finish inner and outer seam welding；
Fourth step，power rotator take finished vessel moving backward；
Fifth step，lay third vessel on idler rotator side；
Sixth step，adjust fit-up rotator to realize fit-up welding；
Seventh step，manipulator finished inner and outer seam welding；
Eighth，power rotator take finished vessel moving backward；
Ninth，lay fourth vessel on idler rotator side；
Tenth，adjust fit-up rotator to realize fit-up welding；
Eleventh，manipulator finished inner and outer seam welding；
Following above step again and again till last vessel is welded.