Pre-bending and sizing are the main steps within the spiral tube forming process. The primary reason for pre-bending is to solve the rebound problem of the tube blank, because the size of the rebound directly affects the intrinsic quality of the steel tube; the key reason for the sizing is to have a better diameter of the tube, because the diameter control is the main quality index of the steel tube. A suitable match between pre-bending and sizing is needed to obtain HDPE pipe fittings.
This is a quick discussion on the formation process and characteristics of submerged arc welding of galvanized spiral steel pipes with 630*3 ribs. The principle of submerged arc welding: Submerged arc welding is using arc thermal energy welding, and manual welding rod arc welding is unique: the submerged arc welding in the welding wire is exposed, there is no coating, submerged arc welding is definitely pre-paved welding flux to become welded The submerged arc welding wire extends in to the flux, and also the arc is formed under the flux. The formation procedure for the submerged arc welding is certainly that this welding wire is in contact with the workpiece.
Right after the start button is pressed, the welding wire and the workpiece are energized, and the welding wire is returned. Withdrawing, the arc ignites, the welding carriage advances, the welding wire is continuously conveyed downwards, the arc is maintained to shed underneath the flux layer, and also the welding pool is formed below the arc. Round the arc, the flux melts to form a cavity. The cavity and also the pool still advance, as well as the metal behind the pool solidifies to create a continuous weld. This process is carried out under the flux, so we can’t see it using the human eye alone. It could be seen with X-ray photography.
Since the spiral steel pipe adopts the welding technology of submerged arc automatic welding, besides this type of high production efficiency; the development auxiliary time is less, the time for changing the welding rod is saved; the welding conditions are clean and no spatter, and the cleaning time is saved; the quality of the welding seam is high. Additionally, it offers the necessary conditions for the delivery from the spiral welded pipe plant, so the production duration of the large spiral steel pipe is guaranteed, so it is still widely used.
1. The pressure-bearing fluid is primarily used for the HDPE Pipe Welding Machine as the tube blank, and is often spirally formed in temperature. It really is utilized for welding with double-sided submerged arc welding and is also mainly used for spiral seam welded steel pipe devices for pressure fluid transportation. The capacity from the steel pipe to resist pressure is strong and the welding performance is also very good. After a variety of rigorous scientific inspections and tests, making use situation is relatively safe and reliable. The solid diameter from the steel pipe is large, the transmission efficiency is also high, also it can effectively save an investment of laying pipelines. It really is mainly employed for pipelines that transport oil and gas.
2. General low-pressure fluid transport is mainly hot-rolled steel coiled tube blanks, often temperature spiral molding, using high-frequency lap welding technique for general low-pressure fluid conveying spiral seam high-frequency welded steel pipe. Welding steel with spiral welds.
3. The new rolled steel strip is utilized because the tube blank, which is often formed by spiral molding and is made from double-sided submerged arc welding or high-frequency welded steel pipe. It is actually utilized for the foundation pile steel pipe for civil building structures, wharves, and bridges.
4. The general low-pressure fluid transport is hot rolled steel strip coiled tube, regular temperature spiral molding, using double-sided automatic submerged arc welding or single-sided welding way of water, gas, air and steam as well as other general low-pressure fluid transport Submerged arc welded steel pipe.
5. The stress fluid transport is situated on the hot-rolled steel strip for tube blanks, regular temperature spiral molding, high-frequency lap welding method used for pressure fluid transmission spiral seam high-frequency welding steel pipe device. The steel tube has strong pressure bearing capacity and good plasticity, which facilitates welding and processing. After qfsnvy variety of strict and scientific inspections and tests, the use of safe and reliable, PERT-AL-PERT pipe, transmission efficiency is also high, and may effectively save the laying pipeline investment. It is mainly employed for the laying of pipelines connecting petroleum, natural gas, etc.