90 degree elbow

The 90 degree elbow can be used in many places. The large elbow stretch bending is a cold bending process with many characteristics. It can bend all kinds of profile sections. Almost all metal profiles and pipes of aluminum, steel, stainless steel, copper and other sections can be made into elbows. The bending quality is good, and it can be formed once through spraying, electrophoresis and electroplating. If the relative bending radius allows, the inner wall of the bend will not wrinkle and the section will not be distorted. Stretch bending can effectively eliminate the residual stress in the bending material, and the product has good dimensional stability. Due to the cold work hardening of metal materials, the actual effect of the material after tension bending can be the comprehensive mechanical properties of the main material. It can bend a variety of curve shapes. In addition to conventional standard arcs, it can also bend U-shaped elbows, S-shaped elbows, W-shaped elbows, ellipses, parabolas, arcs with straight segments, conic curves, non-standard elbows with a series of complex curve shapes such as multiple radii on a curve

90 degree bends will occur when bending steel pipes by induction heating. When the deformation temperature and deformation of the corresponding level are exceeded, microcracks will occur on the outside of the bends. Both conditions are related to the material of the bent pipe. Under the similar forming conditions of deformation speed and high tension resistance, the bending construction of the pipe bender under such conditions may cause damage under such conditions. According to the forming conditions, the crack length is generally reachable. The crack is mainly generated on the austenite grain boundary perpendicular to the stress direction, so it is also perpendicular to the slag inclusion extending the pipe. After the welded pipe is bent, the structure is recrystallized after heat treatment, so that the microcracks are transformed into crystal drag