Large Pipe Internal Longitudinal Welding Machine for Oil Gas Pipeline

A. Role of PIW Oil and Gas Pipe Internal Longitudinal Welding Machine:

1. Large Overall Dimension of Machine: Same as the previous product of large pipe tack welding machine, The Large Pipe Internal Submerged Arc Welding Machine of this product section also has very long total length and even longer. So, it is very hard to take a general view of the machine, only a local sectional view as attached;

2. Work Station: Short for Large Pipe Internal SAW Welding Machine, this machinery is located at the second half stage of the production line, for producing large diameter longitudinal submerged arc welding pipe, which is used in the deployment of Oil and gas pipeline from China West to East;

3. Applied Production Line: We mentioned this Oil gas pipeline production line in the former two products of “Heavy duty Edge Milling machine” and “Large Pipe Tack Welding Machine” for its equipment constitution and workpiece specification.

B. Process Technology of PIW Oil and Gas Pipe Internal Welding Machine:

1.  Plate is sent and have its both sides edge milled with the heavy duty plate Edge Milling Machine;

2. The edge milled pate is sent to pre-bending machine to be bent into the shape of half circular plate;

3. The pre-bent plate is sent to 2000 Ton Press Brake to be bent into a nearly round pipe with only 100mm gap left;

4. The pipe is sent to Large Pipe Tack Welding Machine to be final closed into round shape and tack welded;

5. The tack welded pipe is sent to this Large Pipe Internal Welding Machine，for carrying out large pipe internal longitudinal submerged arc welding;

6. The internal welded pipe is sent to large pipe external SAW finished welding machine, for implementing on external large current submerged arc welding;

7. The welded pipe is sent to large pipe rounding machine for final rounding;

8. The rounded pipe is sent to Hydrostatic Test Machine for testing on its tightness and integrity;

9. The tested pipe is sent to Ultrasonic testing station, to test on internal property of SAW welding seams of large longitudinal SAW welding seam pipes

Thus finish the production of large diameter longitudinal welding pipes, which are basic parts, for deploying oil and gas pipeline, for transporting gas from west to east.

C. Operating on PIW Oil and Gas Large Pipe Internal SAW Welding Machine:

1. Work Principle: This Oil and Gas Pipe Internal Welding Machine has similar working principle as Welding Manipulator, in terms of pipe internal longitudinal welding: That welding mechanism extends into internal of pipe for welding;

2. Mechanical Structure: However, because of much larger and especially longer pipe to be welded, the structure of this large machine is completely different from that of the welding manipulator. Please check attached picture: There is no horizontal boom and upright column as in the case of Welding Manipulator, but instead, with motor drive moving trolley, which is installed with SAW welding torch mechanism;

3. Pipe Size: During work, the workpiece of large and long pipe (20~ 30m long) sits on its supporting rack in stationary status;

4. Executing Unit: A set of welding head extends from the opposing side of the workpiece and moves into the pipe, until reaching the internal terminal of the pipe at far end;

5. Longitudinal Welding Operation: From here, the welding head starts on its SAW process together with its retreating from the pipe, until it welds to the other end of the pipe (near end), and totally retreated from internal of the pipe, thus finishing the job of large pipe internal longitudinal submerged arc welding;

6. Welding Mode: Due to its heavy duty, this Large Pipe Internal SAW Welding Machine adopts with Triple Arc in its submerged arc welding process. The welding current is 400 ~ 500A, with 4mm welding solid wire;

7. Video Camera: Because the SAW is performed at inside of the large pipe, where people can not get access, video monitor is used to monitor on the welding operation inside the large pipes.

D. Technical Parameter of PIW Oil and Gas Large Pipe Internal Longitudinal Welding Machine: