Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of the spiral welded pipe is generally higher than that of the straight welded pipe. It is possible to produce a welded pipe with a large diameter by using a narrow blank, and it is also possible to produce a welded pipe having a different pipe diameter by using a blank of the same width. However, compared with the straight pipe of the same length, the weld length is increased by 30 to 100%, and the production speed is low. Therefore, most of the smaller diameter welded pipes are straight seam welded, and the large diameter welded pipes are mostly spiral welded.
First, the straight seam welded pipe classification
Straight seam welded pipes are formed by bending a steel plate or a steel strip and then welded. According to the weld form, it is divided into straight welded pipe and spiral welded pipe. According to the purpose, it is divided into general welded pipe, galvanized welded pipe, blown oxygen welded pipe, wire casing, metric welded pipe, idler pipe, deep well pump pipe, automobile pipe, transformer pipe, electric welding thin wall pipe, electric welding special pipe and spiral welded pipe.
Second, straight seam welded pipe process flow chart
3. Brief introduction of performance capability of related equipment in straight seam welded pipe process
1. Uncoiler: Plate width is 400-1250mm, detachable inner diameter ¢ 610-760mm, outer diameter ¢ 1200-1800 (max2000mm) mm, material ≤ X70 (standard APISpec5L)
2. Clipping leveler: steel strip width 400-1250mm; steel strip thickness 4-14mm;
3. Shearing machine: steel strip width 400-1250mm, steel strip thickness 4-14mm, material X70;
4. Horizontal spiral looper: the diameter of the feed circle is 200012000mm, the diameter of the discharge circle is 6004600mm, the spiral angle of the strip on the discharge circle is 5.363°, the inlet speed is 40-180m/min, and the exit speed is 8-25m/min.
5. Fine leveling machine: The width of the steel strip is 430-1250mm, the thickness of the steel strip is 4-14mm, the diameter of the leveling roller is ¢180mm, and the length of the roller is 1350mm.
6. Disc trimming machine: cutter head diameter ¢ 480mm, shearing method;
7. Molding machine: Steel pipe outer diameter ¢ 127- ¢ 381 (5′′-15′′) steel pipe wall thickness 4-14mm, steel pipe length 6-14m, high frequency straight seam connection welding roller cold bending (W forming)
8. Welding unit: The diameter of the steel tube is ¢127- ¢381mm, and the wall thickness is 4-14mm.
9. Sizing unit: The diameter of the steel tube is ¢127- ¢381mm, and the wall thickness is 4-14mm;
10. Rolling cutting: Cutting range ¢127- ¢381, wall thickness 4-14mm, cutting speed 30m/min.
11. Flat head chamfering machine: Processing range ¢127- ¢381, wall thickness 4-14mm, processing capacity 2 / min
12. Hydrostatic test machine: Adaptation range ¢127- ¢381, maximum test pressure 25Mpa, processing speed 1.5/min,
13. Online ultrasonic flaw detector: adaptable range, diameter ¢127- ¢381, vertical linearity better than 3%, horizontal linearity better than 1%, dynamic range ≥35dB, defect detection rate ≥95%, sensitivity margin is better 35dB.
14. Offline ultrasonic flaw detector: adaptable range, diameter ¢127- ¢381, vertical linearity better than 3%, horizontal linearity better than 1%, dynamic range ≥35dB, defect detection rate ≥95%, sensitivity margin is better than 35dB.,
15. Medium frequency heat processor: Power 600KW2 sets, heating temperature: 500°C-1200°C, frequency 1KHZ-2KHZ, speed 6-25m/min, heating width ≥20mm, material X70, casing J55.
16. Screen display hydraulic universal testing machine: WEW-600C, computer controlled, suitable for tensile bending, compression (squeezing), shearing, etc. of metal materials, maximum load 600KW.
17. Pendulum impact test machine: JB-300B, maximum impact energy 300J.
Abrasive Fiber Disc
The abrasive fiber disc specifications, size and grit are more, please contact the customer before taking the picture, and the confirmation shall prevail!
Features: This abrasive polishing fiber disc is also called fiber disc, grinding disc, high-speed grinding disc, etc.
An organic coated abrasive made of abrasive and high-strength rigid paper as the base material and bonded by synthetic resin.
Product features: The abrasive fiber disc is a sheet-shaped abrasive tool made of steel paper as the matrix, and the synthetic resin is used to consolidate the abrasive on the matrix.
Scope of application: Abrasive fiber disc can be used for rough processing of various complex surfaces made of metal materials, such as paint removal, rust removal, burr removal, and welding seam grinding. It is widely used in shipbuilding, aviation, locomotives, bridges and other industries.
It is mainly installed on electric: dynamic or pneumatic angle grinders to remove rust, deburr, paint, and polish welds on metal and various non-metallic materials, as well as grinding, smoothing, and polishing in mechanical repair work. , An ideal tool for scraping, and it is also widely used in corner polishing and carving in the furniture industry.
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Zhengzhou Jiading Abrasive Manufacturing Co.,Ltd , https://www.jiadingabrasive.com