Разлики между заваряване в гнездо и челно заваряване

Разлики между заваряване в гнездо и челно заваряване

Socket Weld (SW) fittings

A socket weld fittings involves two different sized pieces of pipe. The smaller one is inside the larger pipe. The 
weld is completely around the outside circumference of the larger pipe.

Butt weld (BW) fittings

A butt weld фитинги is two pieces of materials butted against each other and welded. Several different methods 
exist for beveling the two pieces for good weld penetration. Both flat stock and pipe or tubing can be 
butt welded. Generally, the weld is ground flush with the material surface.

Price

Normally, the price of Socket weld fittings is higher than Butt weld fittings in similar size. But the extra cost of butt weld is higher for installation, considering labor cost and skilled welder.

Feature

Socket weld is easy to install. But it requires approx. 1/16″ of gap at the bottom of the pipe to socket into, to allow thermal expansion. This gap can lead to over stress problem that cracks the fillet weld of the fitting. Socket weld is troublesome in corrosive fluid service due to crevice corrosion. And it is easy to corrode due to the discontinuity of the smooth pipe internals.

Butt weld is the “best” in terms of strength, fatigue, and corrosion resistance, and temperatures compliance. However, it is more difficult to fit-up and weld properly, needing skilled welder and much time.

Източник: Китай Тръбни фитинги Производител - Yaang Pipe Industry (www.ugsteelmill.com)