A welded steel pipe is a steel pipe which is welded and framed by a steel strip or a steel plate and disfigured into a round shape or a square shape, and has a joint superficially. The welded steel pipe has basic generation process, high creation productivity, numerous assortments and determinations, and less gear, however the general quality is lower than that of consistent steel pipe. Since the 1930s, with the quick advancement of top notch strip nonstop moving generation and the 4×4 square steel tubing prices progression of welding and examination innovation, the nature of welded joints has been consistently improved, the assortment determinations of welded steel funnels have been expanding, and an ever increasing number of fields have supplanted Seam steel pipe.
As indicated by various welding strategies, it tends to be partitioned into curve welded pipe, high recurrence or low recurrence electric obstruction welded pipe, gas welded pipe, heater welded pipe, Bondi pipe, etc. As per the state of the weld, it very well may be separated into straight welded pipe and winding welded pipe.
Electric welded steel funnels are utilized in oil penetrating and apparatus producing. Heater welded pipe can be utilized as water gas pipe, and so forth., huge breadth straight crease welded pipe is utilized for high weight oil and gas transportation, and so forth.; winding welded pipe is utilized for oil and gas transportation, pipe heap, dock, etc. Welded steel channels have lower cost and higher generation proficiency than consistent steel funnels. Straight crease welded pipe has straightforward creation process, high generation effectiveness, ease and quick improvement. The quality of the winding welded pipe is commonly higher than that of the straight welded pipe. It is conceivable to deliver a welded pipe with a bigger distance across by utilizing a thin clear, and it is likewise conceivable to create a welded pipe having an alternate pipe measurement with a clear of a similar width. Nonetheless, contrasted and the straight pipe of a similar length, the weld length is expanded by 30 to 100%, and the creation speed is low. Along these lines, a large portion of the littler measurement welded channels are straight crease welded, and the enormous width welded funnels are for the most part winding welded.
The spaces utilized for welded steel funnels are steel plates or strip steels, which are separated into heater welded channels, electric welding (opposition welded) channels and programmed bend welded pipes because of various welding forms. Because of the diverse welding structures, it is partitioned into straight crease welded pipe and winding welded pipe. Because of its shape, it is isolated into round welded channels and unique molded (square, level, and so on.) welded funnels. Welded channels are separated into the accompanying assortments because of their various materials and employments:
GB/T3091-1993 (stirred welded steel pipe for low weight liquid vehicle). It is essentially used to ship water, gas, air, oil and warming water or steam and other general weight liquids and different employments. It represents material Q235A evaluation steel.
GB/T3092-1993 (excited welded steel pipe for low weight liquid transportation). It is essentially used to ship water, gas, air, oil and warming water or steam and other general weight liquids and different employments. Its delegate material is: Q235A evaluation steel.
GB/T14291-1992 (mineral liquid vehicle welded steel pipe). It is mostly utilized for straight crease welded steel channels for mine weight, waste and shaft release. It speaks to the material Q235A, B evaluation steel. GB/T14980-1994 (huge distance across electric welded steel pipe for low weight liquid transportation). It is for the most part used to ship low weight liquids, for example, water, sewage, gas, air, warming steam and different employments. It represents material Q235A evaluation steel.
GB/T12770-1991 (hardened steel welded steel pipe for mechanical structure). Principally utilized in hardware, cars, bikes, furniture, lodging and café improvement and other mechanical parts and basic parts. It speaks to materials 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, and so forth.
GB/T12771-1991 (hardened steel welded steel pipe for liquid transportation). Principally used to ship low weight destructive media. Agent materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, and so forth.