The welded pipe is also called welded steel pipe, and the steel pipe is basically welded by steel plate or strip after being crimped and formed. The welded steel pipe has simple production process, high production efficiency, many varieties and specifications, and less equipment, but the general strength is lower than that of seamless steel pipe. Since the 1930s, with the rapid development of high-quality strip continuous rolling production and the advancement of welding and inspection technology, the quality of welded joints has been continuously improved, the variety specifications of welded steel pipes have been increasing, and more and more fields have replaced Seam steel pipe. Welded steel pipes are divided into straight welded pipes and spiral welded pipes in the form of welds.
First, the classification of welded pipes
Welded pipe according to the purpose of classification: according to the application is divided into general welded pipe, galvanized welded pipe, blown oxygen welded pipe, wire casing, metric welded pipe, roller pipe, deep well pump pipe, automotive pipe, transformer pipe, welded thin wall pipe, electric welding Shaped tube and spiral welded pipe.
Second, the application range of welded pipe
Welded pipe products are widely used in doors, windows, steel, furniture, light-structured doors and windows, boilers, various agricultural machinery, scaffolding, wire threading pipes, high-rise shelves, containers, etc. Can meet customer requirements, special specifications welded pipe can be processed according to user requirements.
Third, the theoretical calculation method of welded pipe weight
The theoretical calculation method of the weight of the welded pipe, he has a formula to follow;
The theoretical weight of steel pipe per meter (the density of steel is 7.85kg/dm3): W=0.02466(DS)S
Where: W--Steel pipe theoretical weight per meter, kg / m;
D--the nominal outer diameter of the steel pipe, mm;
S--The nominal wall thickness of steel pipe, mm.
Fourth, the official definition of welded pipe and industrial use
The blanks used for welded steel pipes are steel plates or strip steels, which are divided into furnace welded pipes, electric welding (resistance welded) pipes and automatic arc welded pipes due to different welding processes. Due to the different welding forms, it is divided into straight seam welded pipe and spiral welded pipe. Because of its shape, it is divided into round welded pipes and special-shaped (square, flat, etc.) welded pipes. Welded pipes are divided into the following varieties due to their different materials and uses:
1. GB/T3091-1993 (galvanized welded steel pipe for low pressure fluid transportation). It is mainly used to transport water, gas, air, oil and heating water or steam, such as general lower pressure fluids and other uses. It stands for material Q235A grade steel.
2. GB/T3092-1993 (galvanized welded steel pipe for low pressure fluid transportation). It is mainly used to transport water, gas, air, oil and heating water or steam, such as general lower pressure fluids and other uses. Its representative material is: Q235A grade steel.
3. GB/T14291-1992 (mineral fluid conveying welded steel pipe). It is mainly used for straight seam welded steel pipes for mine pressure, drainage and shaft discharge. It stands for material Q235A, B grade steel. GB/T14980-1994 (large diameter electric welded steel pipe for low pressure fluid transportation). It is mainly used to transport low pressure fluids such as water, sewage, gas, air, heating steam and other uses. It stands for material Q235A grade steel.
4. GB/T12770-1991 (stainless steel welded steel pipe for mechanical structure). Mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. It represents materials 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, and the like.
5. GB/T12771-1991 (stainless steel welded steel pipe for fluid transportation). Mainly used to transport low pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, and the like.
tainless steel welded wire is widely used in some corrosive environments. Type ss316 and ss304 are the common material applied.
Stainless Steel Mesh is strong and could owns a long lasting lifetime. By its very nature stainless steel wire the mesh doesn`t need additional finish to protect it(galvanizing or PVC). The wire itself is extremely resistant to rust and corrosion. If you need a mesh in an area prolonged exposure to corrosives, stainless steel products will meet the demands.
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