Welding elbow fitting, it can be cut on the pipe or steel plate after welding, its specifications can be very large.The number of sections and radius of bending are determined freely by the producer.Welding bend is not very smooth, both bending radius is not big, generally 1 times the diameter of the pipe.
Welded elbow dimensions
According to the pressure grade, there are about 17 kinds, which are the same as the American pipe standard: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS;Sch80, Sch100, Sch120, Sch140, Sch160 and XXS, among which STD and XS are the most commonly used.
According to the Angle of the elbow, there are 45° elbow, 90° elbow and 180° elbow.In this way, there are many kinds of elbow. When ordering goods, the following expression method is often taken: for example, "LRSTD90°8", which represents the long radius, pressure grade is STD, and the 8" elbow of 90°;Another example is the "SRXS45°4" elbow with short radius and pressure class XS, 45°.
Material division of welding elbow
Carbon steel: ASTM/ASME A234 WPB, WPC
Alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-wp911, 15Mo3 15CrMoV, 35CrMoV
Stainless steel :ASTM/ASME A403 WP 304-304l-304h-304ln-304n
ASTM/ASME A403 WP 316-316 l - 316 - h - 316 ln - 316 - n - 316 ti
ASTM/ASME A403 WP 321-321h ASTM/ASME A403 WP 347-347h
Low temperature steel :ASTM/ASME A402 wpl3-wpl 6
High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70
Medium plate welded
Use the midplate press to make half of the elbow section and weld the two sections together.This process is generally used for bending DN700 or above.