What is the stress of the erw pipe?

In the production process of erw pipe, as long as welding is performed, stress and deformation will occur on the surface of ERW pipe, but only to different degrees. The welding stress and various deformations produced by ERW pipes during the welding process often degrade the quality of the welded products and even cause cracks. Welding deformation caused by changes in the size and shape of the weld, if the change exceeds a certain value, it may not be able to connect with other pipes or cut due to insufficient machining allowance. Next we talk about stress and deformation.

The first is the surface stress of the ERW tube. When the material cannot be displaced under the action of external force, its geometry and size will change, and this deformation is called strain. When the material is deformed, a reaction force of the same size but opposite direction is generated inside the external force. The distribution of the internal force at the concentration point is called the stress, and the product of the stress and the micro-area is the internal force, or the object is caused by external factors (stress, temperature change, etc.) In deformation, the internal force in the interaction of various parts of the body resists the action of this external cause and tries to return the object from the deformed position to its original position. Pre-deformation position.

From a mechanical point of view, deformation refers to a change in the shape of a structure (or part of it). Any structure is made of deformable solid material that deforms and displaces under external force. In the process of pipe production, even if it can be corrected, such as mechanical correction or flame correction, it is not only time-consuming and labor-saving, but also increases the additional stress of the pipe, which is unfavorable for construction use. Therefore, we must understand the causes and dimensions of welding stress and deformation, and how to reduce and avoid welding stress and deformation.

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