The bent pipe is produced step by step and then made into a finished product. During the whole production process, because the pipe must be bent, and the bending of the pipe requires some technology, the degree of bending is also different, than in the whole production process What are the technical requirements used in the process?
1. The online heat treatment of the weld of the closed section can offset the welding stress of the steel elbow, improve the weld structure, and anneal or normalize the entire cold-formed steel to offset the stress. The mechanical properties of the cold-formed steel include strength, tensile strength, and Elongation after a fracture.
2. There shall be no bubbles, cracks, scars, folds, inclusions, or delaminations on the surface of the steel elbow. Slight pits, bulges, indentations, hairlines, scratches, and pressed irons not greater than 10% of the nominal thickness are allowed. Scales and surface defects should be cleaned by grinding, but the thickness of the cold-formed steel after cleaning should not be less than the allowable thickness.
Therefore, the above technologies are used in the production of steel elbows. With the increase of bending requirements and pipeline requirements, the technology used in pipelines will become more and more advanced. During the bending process, the burrs on the pipeline should be cleaned in time, and the quality of the steel elbows is a lot of people. One aspect of concern is that quality determines post-processing and construction, so in the production process, quality is really important, so what are the factors that affect the quality of steel elbows? 1. The accuracy of the curved tire is a factor affecting the quality of the curved pipe. In the manufacturing process of the curved tire, in addition to the limitations of specifications and dimensions, the bending process also requires the user to select the corresponding curved tire according to the diameter of the curved pipe. 2. It is a reference for users to select the relationship between pipe diameter and wall thickness. According to the pipeline processing acceptance criteria, it reflects the influence of relative bending radius and relative wall thickness on the quality of the pipeline. In pure bending, under the action of external force, the outer arm wall of the neutral layer Thinning by tensile stress, compressive stress on the inside, effect and thickening, the resultant force changes the cross-section of the tube. 3. The bending function and appearance erosion of the pipeline itself will also affect the quality of the steel elbow. Observe the processing function and surface corrosion.
The quality of the pipe bend is easily affected by the above factors, especially in the production process, pay attention to the pipe production and bending, after all, many factors may affect the quality of the pipe.