Tuesday, November 19, 2013

SAW straight seam steel coil manufacturing technology

In general, the coil volume header, the volume at the end of the board edge straightness easily exceeded, and prone to heavy skin folds, scars, indentations, scratches and other imperfections and defects, and thus cut steel Kaiping, the appearance and geometric dimensions conform to the technical requirements of the plate lower pass rate, calculated based on the volume weight and the actual weight per unit length of the coil, the budget out of steel rolls long, the whole rationale for determining the shear length and number of sheets of qualified steel; same time as the on-site inspection volume Kaiping head and capuchin defects in real time straight from the severe degree of excessive volumes and closing coil be cut; straightness exceeded for larger volume header plates and capuchin plate edge milling to increase the amount.

Due to the volume board without slitting, rolling board edge defects and imperfections easily exist, such as heavy paper, folded, scarring, indentations, scratches, etc., which feed on the road when the first steel reinforced manual inspection. In addition, because billet steel hot rolled into plates immediately after a coil winding, coiling temperature of 500-600 degrees Celsius, and therefore can not be in the steel mills UT hierarchical testing, coil quality can not be guaranteed. So steel technical conditions "are subject to 100% of all steel stratified testing for 100% of the scan." Domestic steel plant in the feeding line are equipped ultrasonic flaw detection process layering, layering plates thus conducted online testing can be achieved, but the scan area, generally scan area can reach 25 % or more. To improve the scanning coverage of the probe of the packet is changed to a slow walk straight swing back and forth scan, the scan area can be increased to 40 % or more, to ensure the quality of the inner plate line.

Collage volume level edge milling and forming, welding and outside the pre- welding, weld and weld edges enhance elimination board edge defect inspection is the best way. X-ray tube weld industrial TV or X-ray film examination to strengthen the seam side edges 20-50mm base material inspection, pipe automatic weld seam edges UT flaw detection increases stratified parent material testing and inspection, can be very ensure good quality steel pipe weld edge.

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