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LONGITUDINAL SUBMERGED ARC WELDED PIPE (LSAW Pipe)

MANUFACTURING PROCESS CONTROL ITEM＆QUALITY CHARACTERISTICS CONTOLLING RE.MARKS
NO PROCESS CONTROL ITEMS CHECK POINT METHODS LOT  
1 RAW MATERIALS ORDERING          
2 INCOMING SISPECTION * PLATE & WELD METAL 1) DIMENSION 2) CHEMICAL COMPOSITION 3) MECHANICAL PROPERTIES 4)INJURIOUS DEFECT *THICKNESS,WIDTH,LENGTH *TENSILE PROPERTIES *BEND TEST & FRACTURE TOUGHNESS TEST etc. *DENT, OTHER DEFECT *MEASURING THE CHECK POINT BY A GAUGE *TO CHECK THE VALUE STATED ON THE MILL CERTIFICATE *VISUAL INSPECTION * EACH HEAT   
3 PLATE EDGE MILLING  1) DIMENSION 2) HEAT CONTROL  * CUTTING WIDTH * BEVEL ANGLE * HEAT No., PRODUCT No.  *MEASURING THE CHECK POINT BY A GAUGE *TO MARK ON THE PLATE SURFACE AND TO RECORD * EACH PLATE   
4 FORMING (3-ROLL BENDING)  1) DIMENSION  * ROUNDNESS  *MEASURING THE CHECK POINT BY A GAUGE AND VISUAL INSPECTION * AT SPECIFIED TIMES  
5 POST BENDING  1) DIMENSION  * ROUNDNESS  *MEASURING THE CHECK POINT BY A GAUGE AND VISUAL INSPECTION * AT SPECIFIED TIMES  
6 TACK WELDING  1) DIMENSION  * STRAIGHTNESS * OFFSET OF PLATE EDGE  *MEASURING THE CHECK POINT BY A GAUGE AND VISUAL INSPECTION * AT SPECIFIED TIMES   
7 LONGITUDINAL SEAM WELD (INSIDE AND OUTSIDE WELD)  1) WELDING SOUNDNESS  * WELDING CONDITION  * TO CONTROL THE ELECTRIC VOLTAGE AND CURRENT AS SPECIFIED IN THE JIAFANG STANDARD. * AT SPECIFIED TIMES   
8 SIZING  1) DIMENSION  * OUTSIDE DIAMETER AND ROUNDNESS * SURFACE  *MEASURING THE CHECK POINT BY A GAUGE AND VISUAL INSPECTION * AT SPECIFIED TIMES   
9 END FACING  1) DIMENSION  * PIPE LENGTH * BEVEL ANGLE  * MEASURING THE CHECK POINT BY A GAUGE AND VISUAL INSPECTION * AT SPECIFIED TIMES   
10 JOINT WELDING (OUTSIDE, INSIDE WELD)  1) WELDING SOUNDNESS 2) DIMENSION  * WELDING CONDITION * STRAIGHTNESS * HEIGHT OF WELD BEAD * MISALINGMENT  * TO CONTROL THE ELECTRIC VOLTAGE, CURRENT AND SPEED AS SPECIFIED IN THE JIAFANG STANDARD *MEASURING THE CHECK POINT BY A GAUGE * AT SPECIFIED TIMES   
11 HYDROSTATIC TEST 1) WITHOUT LEAKAGE  * TEST PRESSURE AND HOLD TIME * LEAKAGE  * SETTING THE TEST PRESSURE AND HOLDING TIME AS SPECIFIED IN THE CUSTOMER AND PRODUCT SPECFIFICATION. * TO CHECK VISUALLY * EACH PIPE  *ORDER 
12 N.D.T 1) WELD SEAM SOUNDNESS 2)LAMINATION CHECK * WELD DEFECT * PLATE  * INSPECTION BY R-T & U-T  * EACH PIPE  *ORDER 
13 TEST & FINAL INSPECTION * TEST 1) CHEMICAL COMPOSITION 2) MECHANICAL PROPERTIES * FINAL INSPECTION 1) DIMENSION 2) DEFECT  * TENSILE PROPERTIES * BEND TEST & FRACTURE TOUGHNESS TEST etc. * OUTSIDE DIAMETER, LENGTH, WALL THICKNESS, STRAIGHTNESS BEVEL, OUT OF ROUNDNESS ETC. * DENTS, HARD SPORTS, CRACKS * TESTING THE TEST ITEMS BY A TEST EQUIPMENT *MEASURING THE CHECK POINT BY A GAUGE  * AT SPECIFIED TIMES * EACH PIPE   
14 PACKING 1) PACKING CONDITION  * PROTECTION OF PIPES  * BY AGREEMENT WITH PURCHASERS  * EACH PIPE   
15 SHIPPING 1)DELIVERY CONDITION  * DAMAGE, QUALITY, COATING,etc.  * VISUAL INSPECTION  * EACH PIPE   

SPIRAL SUBMERGED ARC WELDED PIPE (SSAW Pipe)

MANUFACTURING PROCESS CONTROL ITEM＆QUALITY CHARACTERISTICS CONTOLLING RE.MARKS
NO PROCESS CONTROL ITEMS CHECK POINT METHODS LOT  
1 RAW MATERIALS ORDERING          
2 INCOMING SISPECTION * COIL & WELD METAL 1) DIMENSION 2) CHEMICAL COMPOSITION 3) MECHANICAL PROPERTIES 4)INJURIOUS DEFECT *THICKNESS,WIDTH,LENGTH *TENSILE PROPERTIES *BEND TEST & FRACTURE TOUGHNESS TEST etc. *DENT, OTHER DEFECT *MEASURING THE CHECK POINT BY A GAUGE *TO CHECK THE VALUE STATED ON THE MILL CERTIFICATE *VISUAL INSPECTION * EACH HEAT   
3 SIDE TRIMMING 1) DIMENSION   * CUTTING WIDTH   *MEASURING THE CHECK POINT BY A GAUGE   * EACH COIL  
4 POST BENDING/FORMING  1) DIMENSION  * DIAMETER  *MEASURING THE CHECK POINT BY A GAUGE AND VISUAL INSPECTION * AT SPECIFIED TIMES  
5 HELICAL WELD(INSIDE AND OUTSIDE WELD) 1)WELDING SOUNDESS * WELDING CONDITION * TO CONTROL THE ELECTRIC VOLTAGE AND CURRENT AS SPECIFIED IN THE JIAFANG STANDARD. * AT SPECIFIED TIMES   
6 PIPE CUTTING＆END FACING 1) DIMENSION2)SURFACE * PIPE LENGTH * BEVEL ANGLE*SQUARENESS*SURFACE *MEASURING THE CHECK POINT BY A GAUGE AND VISUAL INSPECTION * AT SPECIFIED TIMES   
7 HYDROSTATIC TEST 1) WITHOUT LEAKAGE  * TEST PRESSURE AND HOLD TIME   * SETTING THE TEST PRESSURE AND HOLDING TIME AS SPECIFIED IN THE CUSTOMER AND PRODUCT SPECFIFICATION. * TO CHECK VISUALLY * EACH PIPE  *ORDER 
8 N.D.T 1) WELD SEAM SOUNDNESS 2)LAMINATION CHECK * WELD DEFECT * PLATE  * INSPECTION BY R-T & U-T  * EACH PIPE  *ORDER 
9 ACCESSORY WELDING 1) DIMENSION  *WELDING POSITION *MEASURING THE CHECK POINT BY A GAUGE * EACH PIPE *ORDER 
10 TEST & FINAL INSPECTION * TEST 1) CHEMICAL COMPOSITION 2) MECHANICAL PROPERTIES * FINAL INSPECTION 1) DIMENSION * TENSILE PROPERTIES * BEND TEST & FRACTURE TOUGHNESS TEST etc. * OUTSIDE DIAMETER, LENGTH, WALL THICKNESS, STRAIGHTNESS BEVEL,   * TESTING THE TEST ITEMS BY A TEST EQUIPMENT *MEASURING THE CHECK POINT BY A GAUGE  * AT SPECIFIED TIMES * EACH PIPE   
11 MARKING 1) MARKING * PIPE SHALL BE CLEARLY MARKED WITH THE INFORMATION  * VISUAL INSPECTION  * EACH PIPE   
14 PACKING 1) PACKING CONDITION  * PROTECTION OF PIPES  * BY AGREEMENT WITH PURCHASERS  * EACH PIPE   
15 SHIPPING 1)DELIVERY CONDITION  * DAMAGE, QUALITY, COATING,etc.  * VISUAL INSPECTION  * EACH PIPE   

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Specializing in large diameter ultra-thick wall submerged arc welded steel pipe
and spiral submerged arc welded steel pipe

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