ASSEMBLY AND WELDING RIG

This project is for the design of an assembly and welding rig to make up threaded connections of pipes with diameters of 406 – 762 mm for the assembly of testes specimens of threaded connections by welding

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The rig is designed for the assembly of specimens of threaded connections for testing. The tested specimen is a collar with two pipes threaded into it (coupling joint) or two pipes connected by a thread cut in the barrel (streamline joint), with blank plugs welded onto them. The blank plugs serve as elements holding the specimen in the combined load rig. The system is built on the base of the heavy duty screwing lathe RT 117-8 with a welding complex and custom equipment.

4-jaw chuck, D=1000 mm 1 pc.

Reinforced dead head with subspindle 1 pc.

4-jaw chuck for dead head, D=630 mm, 1 pc.

Follow-rest, D=500-800 mm, 1 pc.

Sdeadyrest, D=400-830 mm (standard), 1 pc.

Custom follow-rest, D=400-880 mm, 1 pc.

Custom steady-rest, D=400-880 mm, 1 pc.

Mounting ring, D=508 mm, 2 pcs.

Mounting ring, D=610 mm, 2 pcs.

Mounting ring, D=762 mm, 2 pcs.

Flux collection tray, 2 pcs.

Gage post with clock dial, with scale spacing of 0.01 mm, 3 pcs.

Welding column (w/motorized rotation), 1 pc.

Attached flux welding equipment, 1 kit.

Gas burners to heat the weld seam area to 300ºC, 2 pcs.

Remote temperature gage (pyrometer), 1 pc.

The rig is fitted with a precision positioning system of holding elements to assemble specimens of threaded connections and welding operations. The holding elements are welded caps with ring grooves for the positioning in the test rig. The allowed deviation from axial alignment of caps before welding is not more than 0.1 mm.

This is made possible by the precision of the turning lathe with two 4-jaw chucks, special rests and a set of mounting rings, and a special technological process of assembly and welding.

All welding operations are performed on the turning lathe with the specimen rotating. The welded caps are attached before welding and heat treatment until the specimen completely cools off on the rig.

Pipe diameter

406-762 мм

Collar diameter

432-533 мм

Parameters of components to be assembled on the rig:

Collar length

270-360 мм

Diameter of welded caps

620 мм, длина 847 мм, масса не более 2400 кг

Baseline length of welded caps on the ring groove section:

405 мм

Length of assembled specimens of threaded connections

4600-7400 мм

Max. Weight of assembled specimen with filler of internal cavity

не более 10000 кг