Pre-bending and sizing are the main steps in the spiral tube forming process. The main 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 primary reason for the sizing is to acquire a better diameter of the tube, because the diameter control is the main quality index of the steel tube. An appropriate match between pre-bending and sizing must obtain PEX-AL-PEX pipe.

The following is a quick discussion on the formation process and characteristics of submerged arc welding of galvanized spiral steel pipes with 630*3 ribs. The key of submerged arc welding: Submerged arc welding is the use of arc thermal energy welding, and manual welding rod arc welding is different: the submerged arc welding in the welding wire is exposed, there is absolutely 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 the arc is created under the flux. The formation procedure of the submerged arc welding is such that the welding wire is in touch with the workpiece.

Following the start button is pressed, the welding wire as well as 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 lose underneath the flux layer, as well as the welding pool is actually created below the arc. Around the arc, the flux melts to form a cavity. The cavity as well as the pool still advance, and the metal behind the pool solidifies to make a continuous weld. This procedure is performed beneath the flux, therefore we can’t view it using the human eye alone. It may be seen with X-ray photography.

Considering that the spiral steel pipe adopts the welding technology of submerged arc automatic welding, besides this kind of high production efficiency; the production auxiliary time is less, time for changing the welding rod is saved; the welding conditions are neat and no spatter, and the cleaning time is saved; the standard of the welding seam is high. In addition, it supplies the necessary conditions for the delivery of the spiral welded pipe plant, in order that the production time of the larger spiral steel pipe is guaranteed, therefore it is still commonly used.

1. Pressure-bearing fluid is principally employed for the HDPE pipe fittings because the tube blank, and is often spirally formed in temperature. It is actually used for welding with double-sided submerged arc welding and it is mainly employed for spiral seam welded steel pipe devices for pressure fluid transportation. The ability from the steel pipe to stand up to pressure is strong as well as the welding performance is also very good. After a variety of rigorous scientific inspections and tests, the utilization situation is comparatively safe and reliable. The solid diameter of the steel pipe is large, the transmission efficiency is additionally high, also it can effectively save your time and money of laying pipelines. It really is mainly used for pipelines that transport oil and natural gas.

2. General low-pressure fluid transport is primarily 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 hot rolled steel strip can be used as the tube blank, which is often formed by spiral molding and consists of double-sided submerged arc welding or high-frequency welded steel pipe. It is actually utilized for the cornerstone pile steel pipe for civil building structures, wharves, and bridges.

4. The typical 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 along with 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 number of strict and scientific inspections and tests, the usage of safe and reliable, Multilayer pipe, transmission efficiency is also high, and will effectively save the laying pipeline investment. It is actually mainly employed for the laying of pipelines connecting petroleum, natural gas, etc.

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