Product introduction of double sided submerged arc welded longitudinal steel pipe

Double-sided buried arc longitudinal steel pipe is also a longitudinal seam steel pipe. The main production process of submerged arc welded straight welded steel pipe is flexible, which can produce arbitrary specifications and wall thickness of 325 1420 mm, which largely meets the international requirements for steel pipe size. [Click to learn more about Hebei Huayang Steel Pipe**** more product details and**].

The first advantage is that it is fully automated; The second advantage is that it is welded under the submerged arc, so its heat exchange and protection performance is relatively strong, and the quality of welding is relatively high; The third advantage, because the arc is buried under the flux in the automatic submerged arc welding, so it can use large current, the welding efficiency is relatively high, recently our country is carrying out the West-East Gas Pipeline Project, the pipeline is a kind of high-strength steel, this kind of pipeline is prefabricated in the factory for a section, and then taken to the construction site, welded in the field, the welding process of this pipeline in the factory is the use of submerged arc welding, and now submerged arc welding has been developed, there are double wire submerged arc welding, as well as multi-wire submerged arc welding, the efficiency is further improved.

If you have an idea to understand this aspect, you can pay attention to Huayang Steel Pipe. The company has a superior geographical location, convenient transportation, continuous development effect of the enterprise, full of development stamina, and is in a rising period. The company undertakes the construction of landmark projects at home and abroad, and its products are sold to various cities and exported to more than 80 regions in Southeast Asia, the Middle East, Europe and the United States, etc., and enjoys a high reputation in China.

This solder system consists of a funnel of solder delivered through a pipe to the front to be welded. The second difference is that instead of using welding rods, welding wires are used, because welding wires can be fed continuously; Welding rod, we have to have a welding rod head after burning a welding rod and throw it away, and the operation has to stop, change the welding rod and then weld. After changing to welding wire, use the device of feeding welding wire and the welding wire spool to continuously feed the welding wire, this welding method is the welding wire continuously fed, and ignite the arc under the cover of meltable granular flux, so that part of the welding wire, base metal and flux melt and evaporate to form a cavity, and the arc is stably burned in the cavity, so it is called submerged arc automatic welding.

The arc is buried in the cavity. The first advantage of this approach is that it is fully automated; The second advantage is that it is welded under the submerged arc, so its heat exchange and protection performance is relatively strong, and the quality of welding is relatively high; The third advantage, because the arc is buried under the flux in the automatic submerged arc welding, so it can use large current, the welding efficiency is relatively high, recently our country is carrying out the West-East Gas Pipeline Project, the pipeline is a kind of high-strength steel, this kind of pipeline is prefabricated in the factory for a section, and then taken to the construction site, welded in the field, the welding process of this pipeline in the factory is the use of submerged arc welding, and now submerged arc welding has been developed, there are double wire submerged arc welding, as well as multi-wire submerged arc welding, the efficiency is further improved.

Double-sided submerged arc welding longitudinal seam steel pipe is a new welding method invented in 1940, it is the same as the previous manual welding is that it still uses slag protection, but this slag is not the coating of the welding rod, it is specially smelted out of the solder.

The welding process is not the same, and the performance is roughly the same.

Spiral seam welded steel pipe, now generally submerged arc welding, referred to as SSAW (spiral seam submerged arc welded steel pipe).It is made of steel coil spiral coiled into a steel pipe. It has a spiral weld on the surface, so it is called a spiral welded pipe.

Double-sided submerged arc welding spiral steel pipe, double-sided submerged arc welding process welded spiral seam steel pipe.

Plate exploration: The steel plate used to manufacture large-diameter submerged arc welded longitudinal steel pipe enters the production line, and the whole plate ultrasonic inspection is first carried out; 2.

Edge milling: Double-sided milling of the two edges of the steel plate through the edge milling machine to achieve the required plate width, plate edge parallelism and groove shape; 3.

Pre-bending: The pre-bending machine is used to pre-bend the plate edge, so that the plate edge has the curvature that meets the requirements; 4.

Forming: On the JCO molding machine, half of the steel plate that is pre-bent is first pressed into it by multiple steppers'j'shape, and then bend the other half of the steel plate equally and press it'c'shape, and finally form an opening'o'Form 5

Pre-welding: make the formed longitudinal welded steel pipe close and use gas shielded welding (MAG) for continuous welding; 6.

Internal welding: longitudinal multi-wire submerged arc welding (up toFivewire) is welded on the inside of the longitudinal seam steel pipe; 7.

External welding: longitudinal multi-wire submerged arc welding is used to weld on the outside of the longitudinal submerged arc welded steel pipe; 8.

Ultrasonic inspection: 100% inspection of the internal and external welds of the longitudinal welded steel pipe and the base metal on both sides of the weld; 9.

X-ray inspection: 100% X-ray industrial television inspection of internal and external welds, using image processing system to ensure the sensitivity of flaw detection; 10.

Diameter expansion: The full length of the submerged arc welded longitudinal steel pipe is expanded to improve the dimensional accuracy of the steel pipe and improve the distribution state of the stress in the steel pipe. 11.

Hydrostatic test: The expanded steel pipe is inspected one by one on the hydrostatic testing machine to ensure that the steel pipe meets the test pressure required by the standard, and the machine has the function of automatic recording and storage; 12.

Chamfering: The steel pipe after passing the inspection is processed at the end of the pipe to achieve the required groove size of the pipe end; 13.

Ultrasonic inspection: ultrasonic inspection is carried out again one by one to check the possible defects of the longitudinal welded steel pipe after the expansion and water pressure; 14.

X-ray inspection: X-ray industrial television inspection and pipe end weld taking pictures of the steel pipe after the expansion and hydrostatic test; 15.

Tube End Magnetic Particle Inspection: This inspection is performed to find defects at the end of the tube; 16.

Anti-corrosion and coating: The qualified steel pipe is anti-corrosion and coated according to the user's requirements. Huayang steel pipe phone: one, three, seven, travel slow key.

Three, one, seven.

Spiral seam submerged arc welded steel pipe refers to a metal pipe with spiral seam welded by submerged arc welding process.

It is generally used in: welded into pipelines for fluid transportation, metal structures, pile foundations, etc.

The products are widely used in water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction, and are one of the 20 key products developed in China. For liquid transportation: water supply and drainage.

For gas transportation: coal gas, steam, liquefied petroleum gas. For structural purposes:

as piling pipes and bridges; Pipes for wharves, roads, building structures, etc.