SAWL Pilling Pipe
1.Application： Pilling,Website:, seashore platform, ground construction2. SAWL steel pipe Product specification: O.D.: Ф406.4～Ф1422.4mm（16-56in） Length: 3～12.3m W.T.: 8～50mm (apply to simple carbon steel, Low carbon alloy steel)Product standards: ASTMA252, API 5L, DIN EN10219/10224, BS, JIS A5525, JIS G3444, ASTMA139, GB/T3091GR.2/GR.3, Grade STK290-540, Grade A-E, Q215-Q3453. Pile pipe production process☆ Plate Ultrasonic Inspection： Each plate is first full-plate ultrasonic inspected after entering the process☆ Plate Edge Milling： The Plate edges are milled by Edge Milling Machine to obtain the required width, parallelism and bevel angles; ☆Plate Edge Crimping：The two edges of the plate are crimped at the Crimping Machine to get the required radius; ☆Forming： The first half of the plate is fed step by step into the Pipe Forming Press to form the plate into a" J "shape. Then another half of the plate is pressed step by step to form the plate into" C "shape. The last stroke is to press the plate into an open "O" shape; ☆Pre-Welding： The two edges of the open seam pipe should be brought together by tack welding machine then welded by tack welder using metal active-gas arc welding (MAG) process; ☆Inside Welding： The pipe is welded from inside of the pipe by multi-pass tandem submerged-arc welding (max. four wires); ☆ Outside Welding： The pipe is welded from outside of the pipe by multi-pass tandem submerged-arc welding;
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