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Monitoring requirements for manufacturing process of spiral seam submerged arc welded steel pipe products
keyword Spiral seam submerged arc welded steel pipe Category Steel pipe quality Related products Get a quote| Monitoring requirements for manufacturing process of spiral seam submerged arc welded steel pipe products | ||||
| No. | Process name | Inspection items | Control content | Inspection frequency |
| 1 | Raw material incoming inspection | Welding wire receiving | Packaging, batch number, brand, specification, quantity, diameter, supplier | Each batch of furnace |
| quality certificate | ||||
| Flux receiving | Packaging, batch number, brand, specification, quantity, mesh, non-metallic | Each batch of furnace | ||
| Inclusion, moisture content, supplier quality certificate | ||||
| Welding rod receiving | Packaging, batch number, brand, specification, quantity, diameter, supplier | Each batch of furnace | ||
| quality certificate | ||||
| Geometric dimensions of surface quality of steel strip | Surface quality, geometric dimensions, specifications, steel grade, weight, quantity | Each roll | ||
| Supplier Quality Certificate. | ||||
| Chemical composition of steel strip | chemical composition | Once per batch per furnace | ||
| Physical properties of steel strip | Tensile test, bending, impact, elongation% | Once per batch per furnace | ||
| 2 | Welding material drying | flux | Specification, brand, drying quantity, drying temperature, insulation time | 100% per batch |
| welding rod | ||||
| 3 | Open book leveling | Surface quality, geometric dimensions, and identification of steel strip | The specifications, steel grade, width, thickness, scratches, bumps, hard blocks, sickle bends, surface quality, and markings of the steel strip. Load according to furnace batch number. | Each roll |
| 4 | Shear welding | weld parameter | Shear quality, butt gap, bevel angle, blunt edge, number of welding layers, welding current, welding voltage, welding speed, weld width, weld height, etc. | Each weld seam is 100% |
| 5 | Edge milling | Milling parameters | Groove angle, blunt edge, width after milling, etc | Each roll |
| 6 | Forming | molding parameters | Bridge angle, inner roller angle and position, external control position, pitch, pipe circumference, surface quality, etc | Initially, 3 pipes were produced and fully inspected, followed by every 2 hours |
| 7 | Internal and external welding | weld parameter | Welding current, welding voltage, welding speed, welding wire angle, flux material grade, welding wire diameter, dry elongation, welding point position | Initially, 3 pipes were produced and fully inspected, followed by every 2 hours |
| 8 | Initial inspection | Outer diameter and length | Pipe circumference and measured length of pipe body | Each one |
| 9 | Cut to length | Welding deviation | Biting, misalignment, weld height | 100% |
| SURFACE QUALITY | Indentation, scratch, porosity, burn through, arc break, crack, hard block, etc | 100% | ||
| cut lengths | Measure according to standards or contract provisions | Each one | ||
| 10 | Product physical and chemical performance test | Product Analysis | chemical composition | Twice per batch (sampling of steel pipes produced on different rolls) |
| Mechanical properties | Pipe body stretching | Each ≤ 100 steel pipes with the same cold expansion rate are considered as one test unit | ||
| Spiral weld stretching | Each ≤ 100 steel pipes with the same cold expansion rate are considered as one test unit | |||
| Head weld stretching | Each furnace should not exceed 50 pieces for testing once | |||
| Spiral weld guided bending test | Steel pipes with the same cold expansion ratio ≤ 50 are considered as one test unit | |||
| Head weld guided bending test | Make 50 steel pipes with the same cold expansion ratio once | |||
| 11 | hardness test | Hard block hardness test | Hard block hardness single point indentation ≤ 35HRC (327HBW, 345HV10) | Hard blocks exceeding 50mm in any direction |
| 12 | Metallographic examination | Macro inspection | Internal and external weld deviation ≤ 3mm | At least one production start per work shift |
| 13 | DWT | drop weight tear test | If there is an agreement, D ≥ 508mm welded steel pipe body, DWT test | Steel pipes with the same cold expansion ratio are tested once per test unit |
| 14 | Internal inspection | Geometric dimensions of steel pipes, quality of internal and external welds | Pipe section circumference, ellipticity, weld size (internal weld height, misalignment, undercutting, etc.), internal surface quality (indentation, scratch, porosity, burn through, arc break, hard block, etc.) | Each one |
| 15 | Grinding | Treatment of surface defects and imperfections | Minimum wall thickness, welding current, welding voltage, welding speed, and number of welding layers for the grinding area | Each one |
| Repair welding | Manual UT flaw detection | Recheck the repair area | Each one | |
| 16 | RT testing | Spiral weld and butt weld | Size and distribution detection of slag or porosity defects. | Each one |
| 17 | Flat headed chamfer | Groove angle | 30 ° -35 ° or as specified in the contract | Each one |
| truncated edge | 0.8-2.4mm | Each one | ||
| shearing oblique | ≤1.6mm | Each one | ||
| pipe end | No burrs inside or outside | Each one | ||
| 18 | Grinding of welding seams inside the pipe end | Pipe end weld height | Remove the excess height of the internal weld seam within a range of 100mm at both ends of the pipe, with the excess height of the internal weld seam ≤ 0.5mm; External welds shall be in accordance with standards or contract provisions | Each one |
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