Long radius socket weld elbow manufacturer, technical requirements, require control of the radius of curvature. For example, if the radius length is 1.5D, then the radius of curvature must be within the required tolerance range. Since most of these pipe fittings are used for welding, in order to improve the welding quality, the ends are beveled with a certain angle and a certain side. This requirement is also stricter, how thick the side is, what is the angle and the range of deviation There are regulations, and there are many more items in geometric dimensions than pipe fittings. The surface quality and mechanical properties of elbows are basically the same as those of pipes.