Welding Rotators are mainly used to rotate or position the cylindrical jobs for circumferential welding (TIG / MIG / Sub Arc). The machine usually consists of Single Drive unit, an Idler unit and a Control panel with pendant. For step less speed variation, D. C. Thyristor drive or AC frequency variable drive may be used. Metallic rollers are bounded with natural rubber or polyurethane as and when a specific requirement may come.
Shown alongside is a picture of a Self Aligning Type Welding Rotator. Self Aligning Rotators automatically adjust the
Roller Housings to accept any job diameters with in the specified diameter range. These types of machines are generally used to cope with the increased production demands.
The roller housings of this type of machine
are hinged to the beds and open up automatically when a larger diameter job is introduced. In this type of rotator, each Roller bracket assembly has two separate roller assemblies, and thus supports the job on a wider area.
The final drive is given to all the 4-sets of rollers of the Drive Unit, in special models, providing better traction to the job. However, in that case a de-clutching arrangement is provided to the top rollers,
in order to protect the gear boxes, as when the job hits the top rollers first while loading, forcing it to rotate via the self-locking gearboxes.
Salient Features
- Both the rollers are adjusted automatically for all job diameters
- Accepts complete range of job diameters in a single setting
- Centre axis of job remains stable for all job diameters
- Wide range of Job diameters and Load capacities
- Most suitable for 'thin walled' shells of large diameters
- A "Four roller" contact gives superior 'slip free' traction for thin walled vessels
- Better acceptability to ovality of vessels compared to other models
- Proven reliability and higher productivity