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Production process of welded elbows
Release time:
Oct 19,2020
A welded elbow is a pipe fitting used for changing the direction of a pipeline. It accounts for approximately 80% of all pipe fittings used in piping systems. Moreover, different materials of elbows generally allow for the selection of various forming processes. Common forming processes for welded elbows employed by manufacturers include hot pressing and extrusion. The hot-push forming process for hot-push elbows utilizes specialized elbow-forming dies, core molds, and heating devices. In this process, flat material on the die is pushed forward by a pusher, undergoing contraction and bending as it is heated, expanded, and subjected to compression.
A welded elbow is a pipe fitting used for turning pipes. It accounts for approximately [a certain percentage] of the total number of pipe fittings used in piping systems. 80 %. Moreover, for elbows made of different materials, various forming processes can generally be selected. Commonly used forming processes for welded elbows by manufacturers include hot pressing and extrusion. The hot-push forming process for hot-push elbows utilizes specialized elbow-forming dies, core molds, and heating devices. In this process, the flat material on the die is pushed forward by a pusher, undergoing contraction and bending as it is heated, expanded, and subjected to compression.
Its deformation characteristic is to determine the inner diameter of the pipe based on the principle that the volume of metallic material remains constant before and after plastic deformation. This allows the metal compressed at the inner arc to flow freely, while also compensating for thinning in other areas caused by expansion, thereby producing elbows with uniform wall thickness. In general, the forming process for welded elbows features continuous operation and is well-suited for mass production. Consequently, it has become the primary forming method for alloy steel elbows and, under certain conditions, can also be applied to the forming of some stainless steel elbows. The heating methods used include high-frequency induction heating, flame heating, and reflection furnace heating.
Moreover, the heating method for welded elbows also depends on the requirements of the finished product. In the production of standard elbows, other forming processes have largely replaced it. Furthermore, for certain elbow specifications—particularly those with low production volumes or excessively thin walls—this method is used only when the product has special requirements.
Seam-welded elbows are made from tubing with an outer diameter identical to that of the bent pipe and are directly pressed into a die using a press. Before stamping, the cylinder is placed on the lower die, and the core and end die are installed inside the cylinder. The upper die then moves downward and begins to apply pressure. The seam-welded elbow consists of an outer die that provides confinement and an inner die that offers support. In the hot-push forming process, the outer arc of the seam-welded bend remains in a state of tension during forming, resulting in a reduction in the wall thickness of the outer arc. 10 About %.
Moreover, since seamless elbows are characterized by single-piece production, the stamping process is often employed in the manufacture of small-batch, thick-walled elbows. There are two types of hot-stamping for seamless elbows: hot stamping. The choice of hot-stamping method typically depends on the material properties and equipment capacity. In this forming process, a specialized bending machine is used to place the tubular blank into an external die.
In the production of welded elbows, cold-extrusion forming using inner and outer dies yields elbows with small dimensional deviations. Therefore, this process is often employed for manufacturing stainless steel elbows—especially thin-walled stainless steel elbows. The inner and outer dies used in this process feature high precision and stringent tolerance requirements. The intermediate plate is machined by a press into half of the elbow section, after which the two halves are welded together. However, due to its relatively complex process and challenging operational demands, as well as lower forming quality compared to the aforementioned processes, this method is seldom used. 。
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