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Advantages and disadvantages of socket welding fittings.
Release time:
18 Oct,2024
Ray radiography is not practical for corner welds; therefore, proper assembly and welding are crucial. Corner welds can be inspected using surface inspection, magnetic particle (MP), or liquid penetrant (PT) testing methods.
Advantages
1. No bevel preparation is required for welding the pipes.
2. Alignment does not require temporary spot welding, as the fittings ensure proper alignment in principle.
3. Weld metal cannot penetrate the holes in the pipes.
4. They can be used as a substitute for threaded fittings, thus significantly reducing the risk of leaks.
5. Radiographic inspection on corner welds is impractical; therefore, proper assembly and welding are crucial. Corner welds can be inspected using surface examination, magnetic particle (MP), or liquid penetrant (PT) methods.
6. Due to the lack of strict assembly requirements and the elimination of special processing for butt welding end preparation, construction costs are lower than for butt welded joints.
Disadvantages
1. Welders should ensure that the expansion gap between the pipe and the socket shoulder is 1/16 inch (1.6 mm).
ASME B31.1 Section 100.127.3 Welding Preparation (E) for socket weld assembly states:
When assembling joints before welding, the pipe or tube should be inserted into the socket to the maximum depth, then withdraw about 1/16" (1.6 mm) from the contact between the end of the pipe and the shoulder of the socket.
2. The expansion gap and internal cracks left in the socket welding system promote corrosion, making it less suitable for corrosive or radioactive applications, where solid accumulation at the joints may lead to operational or maintenance issues. Butt welds are generally required in all pipe sizes and must be fully penetrated into the pipe.
3. Socket welding is unacceptable for ultra-high hydrostatic pressure (UHP) applications in the food industry, as they do not allow for complete penetration and leave very difficult-to-clean overlaps and cracks, resulting in virtual leaks.
The purpose of the bottom gap in socket welding is generally to reduce the residual stress that may occur at the root of the weld during the solidification of the weld metal and to allow for different expansions of the mating components.
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Specializing in the production of various pipeline equipment
Main Products
The company's products mainly include three series and more than 100 varieties: main ceramic wear-resistant pipes, pipe fittings, bimetal surfacing wear-resistant pipes, elbows, elbows, tees, crosses, reducers, pipe caps, flanges, supports and hangers, waterproof sleeves, corrugated compensators, etc.
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Tel:+86-317-5121666
E-mail:yongle@zhsteelfittings.com
Website:www.yszhuoheng.com
Address: No. 12, Pu 1st Road, Pu Wa Industrial Park, Yanshan County, Cangzhou City, Hebei Province
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