Year1
- 规格：
- 219-3500mm
- 规格：
- 6-28
- 型号：
- sy/t5037-2012
Material? Edit,,,,,,,,,,,,,,,. Uses of spiral welded pipes
? Editor: Spiral welded pipes are mainly used in water supply projects, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction in China. For liquid transportation: water supply and drainage. For gas transportation: coal gas, steam, liquefied petroleum gas. Structural use: used as piling pipes, pipes for bridges, docks, roads, building structures, etc. Spiral welded pipe production process? Edit Spiral welded pipe is also a type of welded pipe equipment. Its strength is generally higher than that of straight seam welded pipe. It can use narrower billets to produce larger diameter welded pipes, and can also use billets of the same width to produce pipe diameters. Different welded pipes. However, compared with the straight seam pipe of the same length, the weld length is increased by 3~, and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, while large diameter welded pipes mostly use spiral welding. Spiral steel pipe production process: It is a spiral seam steel pipe welded by automatic double-wire double-sided submerged arc welding process using strip steel coil plate as raw material, constant temperature extrusion molding. , the raw materials are steel strip coil, welding wire and flux. They must undergo strict physical and chemical inspections before being put into use. , The strips are butted head to tail, using single or double wire submerged arc welding, and after being rolled into steel pipes, automatic submerged arc welding is used for repair welding. , Before forming, the strip steel is leveled, trimmed, planed, surface cleaned, transported and pre-bent. . Electric contact pressure gauges are used to control the pressure of the cylinders on both sides of the conveyor, ensuring smooth conveying of the strip. , using external control or internal control roller forming. , The weld gap control device is used to ensure that the weld gap meets the welding requirements. The pipe diameter, offset amount and weld gap are strictly controlled. , internal welding and external welding use American Lincoln welding machines for single-wire or double-wire submerged arc welding to obtain stable welding specifications. , The completed welds are inspected by an online continuous ultrasonic automatic flaw detector to ensure the non-destructive testing coverage of the spiral welds. If there is a defect, it will automatically alarm and spray mark, so that production workers can adjust the process parameters at any time to eliminate defects in time. , use air plasma cutting machine to cut the steel pipe into individual pieces. After cutting into single steel pipes, the first three steel pipes of each batch must undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion status of the welds, the surface quality of the steel pipes, and non-destructive inspection to ensure that the pipe making process is qualified. , can it be officially put into production. . The parts with continuous sonic flaw detection marks on the welds will undergo manual ultrasonic and radiographic re-examination. If there are defects, they will be repaired and then undergo non-destructive inspection again until it is confirmed that the defects have been eliminated. , strip butt welds and the pipes where the T-shaped joints intersect with the spiral welds are all inspected by radiography or film. , Each steel pipe has undergone a hydrostatic pressure test, and the pressure is radially sealed. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Test parameters are automatically printed and recorded. , The pipe end is machined to accurately control the end face verticality, bevel angle and blunt edge. Anti-corrosion spiral welded pipe technology
Since the individual mass of spiral welded pipes is relatively large, they must be stacked outdoors. However, they will inevitably be exposed to the sun and rain, so the problem of rust has always plagued the storage time and storage time of spiral welded pipes. condition. Therefore, it is necessary for us to provide a comprehensive answer to the anti-rust knowledge of spiral welded pipes.
Mainly use tools such as wire brushes to polish the steel surface. Cleaning and preheating of spiral welded pipes can remove loose or lifted oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach level 3, and the rust removal of power tools can reach level 3. If there is a strong iron oxide scale attached to the surface of the steel, the rust removal effect of the tool will not be ideal and the anchor pattern depth required for anti-corrosion construction will not be reached.
Pickling uses solvents and emulsions to clean the surface of welded steel pipes (welded pipes) for low-pressure fluid transportation to remove oil, grease, dust, lubricants and similar organic matter, but it cannot remove rust, oxide scale, Welding flux, etc., so it is only used as an auxiliary means in anti-corrosion production.
Generally, chemical and electrolytic methods are used for pickling treatment. Only chemical pickling is used for pipeline anti-corrosion, which can remove scale, rust, and old coatings. Sometimes it can be used as a reprocessing after sand blasting and rust removal. Although chemical cleaning can achieve a certain degree of cleanliness and roughness on the surface, its anchor lines are shallow and it is easy to cause pollution to the spiral welded pipe stacking environment.
Reasonable use of means to clean rusty pipe fittings ensures that the pipe fittings can serve production for a long time and create more production benefits.
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