Be able to show important value in different industries and fields. When the coiled pipe is greater than 600mm, two longitudinal welds are allowed, and the spacing shall be greater than 200mm.
All continuous pipe welds shall be penetration tested.
.Large diameter thick wall coiled pipe is usually higher than dn450. Large diameter thick wall coiled pipe sometimes has two welds. The reason why this happens is mainly because of raw material problems and equipment processing. Steel mills usually do not produce steel plates with the required width of large-diameter welded pipes required by customers. Therefore two plates need to be welded, so welds will occur. Large diameter thick wall coiled pipe can mainly carry out flaw detection, and the requirements related to delivery are wider than other products. Ultrasonic flaw detector is mainly used to detect large-diameter thick wall coiled pipe. The same circular joint of coiled pipe shall not be greater than 2.
When the nominal diameter is larger than the internal seal of the pipe, and when the butt weld is flush with the pipe it is and coiled pipe. During pipe rolling, the surface of the circuit board shall be protected from damage.
.Move the steel pipe twice to weld and reinforce the rolled pipe joint, and then transport it to the welding platform for welding.
Hot rolled steel pipe is a kind of thick wall steel pipe rolled under the condition of heating the steel plate.
The second stage is called the complex compensation stage, that is, the sector of the coiled pipe will gradually reduce its speed until it reaches the required position, which is the inner circumference position of the steel pipe before complex required by the process design. The second stage is the pressure maintaining and stability stage: the sector block remains stationary at the inner circumference of the steel pipe before re assembly, which is the pressure maintaining and stability stage required by the equipment and expanding process.
The rolling pipe production technology requires that the rolling pipe weld is a double-sided weld, two longitudinal welds are allowed, and the weld spacing exceeds 300 mm. The welding appearance and quality standard shall not be lower than the level standard in the welding specification.
Grounding current, while external welding uses a larger welding current. However, when the welding current is large, the effect of welding rod is intensified, and the melting amount of welding wire is also increased accordingly, the weld reinforcement is increased, the weld formation is deteriorated,Q550b welded pipe, and the edge transition is poor.
Round welded pipe joints shall be circular. The arc length of the coil calibration circle shall be 1 / 6 to 1 / of the circumference of the pipe, and the gap between the sample and the pipe shall comply with
Respect for customers.Weld size has a great influence on the quality of rolled steel pipe. Weld size mainly includes welding process parameters, welding wire shape and position parameters, flux flow, flux process performance and weld forming.
Gas and other projects.
During pipe rolling,20# large diameter reel, the surface damage of steel plate shall be prevented. The parts with serious scratches must be polished for transition, and the wall thickness of the polished parts shall not be less than the design wall thickness.
The convex hull on the surface of the crimp roll shall be treated. Before repeated processing, the equipment surface shall be treated to prevent the convex hull steel plate with abnormal roll surface from causing pits.
reform.Generally, the wall thickness of the coiled pipe is 20mm and the outer diameter is 450-3000mm. It is directly welded, formed, rolled, butted,Q460b large diameter thick wall welded pipe, removed and reinforced from the steel plate. The coil pipe has the advantages of short processing time, fast delivery and low cost. The rolling pipe is mainly used for pipes, billboards, thick wall straight seam rolling pipe large-diameter thick wall rolling pipe, steel casing, on-site settlement and honest operation for individuals and enterprises all over the country. There are offices in various places, which can cooperate for a long time. When punch expanding, it can reduce the ovality of steel pipes The effect depends on the uniformity of steel pipe wall thickness. For hot-rolled pipes with serious uneven wall thickness, such as steel pipe rolled by periodic pipe mill (see pipe rolled by periodic pipe mill), the thick wall coil deteriorates after punch expanding. Therefore, in order to eliminate the influence of uneven wall thickness and reduce the ovality of steel pipe, punch expanding + sizing ring compression method should be adopted.
Be able to show important value in different industries and fields. When the coiled pipe is greater than 600mm, and the spacing shall be greater than 200mm.
.Due to the continuous application of thick wall coiled pipe in industry and the continuous expansion of its scope, it has many advantages. In order to prevent the thick wall coiled pipe from rusting, we can apply antirust oil on the surface of the thick wall coiled pipe.
Have we learned about the packaging process of the steel used? Today, let's discuss the packaging process of lower thick wall coil.
After, we should prevent the surface damage of the plate. The parts with serious scars must be grinded to make transition, and the wall thickness of the grinded part shall not be less than the design wall thickness. Steel rolling pipe is an unconventional pipe, and there is no domestic standard at present. Therefore, the inspection is mainly aimed at the thickness and weld quality.