Difference between mechanical elbows and welded elbows
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Dear sea friends: How do mechanical elbows differ from welded elbows? I don’t have a standard on hand
The mechanism elbow you mentioned is generally referred to as a stamped elbow, while a welded elbow is created by welding together multiple sections of pipe or steel plates. Both types of elbows are subject to specific standard requirements, and there are also significant visual differences between them that can be noticed at a glance
The appearance makes them easy to distinguish; it’s not clear what the original poster is trying to say – I’m not sure if it refers to limitations in terms of usage. Usually, no welded elbows are used on containers, unless it’s a very large bend, in which case welding is employed due to the difficulty of obtaining such bends. However, in such cases, RT testing is required for the welds.
The mechanical elbow complies with the standards GB/T12459, SH3408, and HG/T21635; it is a steel butt-welded seamless pipe fitting； Its surface has no welds. Welded elbows comply with the standards GB/T13401, SH3410, and HG/T21631; they are welded pipe fittings made of steel plates, with welds on their surface.
Thank you, I was wondering about the differences in usage
Mechanical elbows are generally used in pressure pipelines, while welded elbows are commonly used in low-pressure utility systems such as those for water and air.
1. Mechanically formed elbows should be seamless elbows: their production process mainly involves pressure molding or medium-frequency hydraulic extrusion, resulting in a one-time forming process, with the material being seamless steel tubes. 2. Welded elbow: It is formed by pressing the two halves of a steel plate using a press and then welding them together; it has weld seams.