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Quality Control in Straw Production

Quality Control in Straw Production. Yu.Potrebenikov & S.Movchan 14.09.2009. Straw Welding Machine. 2. New conditions of straw production. mowing welding machine into clean room:

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Quality Control in Straw Production

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  1. Quality Control in Straw Production Yu.Potrebenikov & S.Movchan 14.09.2009

  2. Straw Welding Machine 2

  3. New conditions of straw production • mowing welding machine into clean room: • T=(23±1)o, humidity H=(65±5)%, dust control, atm. P -> DB • measurement of Al tape width for each spool, -> DB • daily check the welding machine characteristics:ultrasonic generator amplitude and clock; ultrasonic head pressure • to Al tape; Al tape friction, tension and speed of transport part • flush inert gas of welding region (by ionization gun) • automatically check quality by video chamber simultaneously with welding • cut 2 samples (at the beginning and at the end) and carrying out test by tensile test machine; - > DB • used box for straw transportation and storage • straw ID (bar code?) -> DB • operator name, date and time -> DB • long time test straw (~ 1 month) with overpressure (using nipples)

  4. Good Straw Specifications • h Mylar /h Al = 36μm/0.15 μm • diameter, D0 (9.77 ± 0.05) mm • elliptic shape (difference D1 and D2 from D0) ±0.1 mm • seam width (0.6 ± 0.2) mm • seam shape “good” • overpressure test 3 bar @ 10 min • cyclic test (dP=0->3bar->0) N=10 • straw length (2300 ± 1) mm • Al skin resistance (R) (35 ± 5) Ohm/m • gas leakage (N2 at dP=1.5 bar) < 0.003 cc/min • straw non straightness (L=2300 mm) ± 1 mm

  5. Optical microscope Optic zoom - x 60 Weld seam visual Quality Control Good shape BAD shape fusion

  6. Test straw at dP=3 Bar and dT=10 min Overpressure Quality Control Straw is OK! if: 1) dP=3 Bar and dT=10 min 2) N=10 cycles (0->3bar->0/1 min)

  7. Gas leak Quality Control Tested straw is OK: if pressure dropless than 0.2mbarper10 min at P=1.5 bar overpressure

  8. Spare

  9. Welding instead of gluing

  10. Straw with moving end concept

  11. * Straws fully assembling outside chamber on the usual working place. * O-rings using instead of glue. * One end of straw is free. * Anode wires are centering into straws independently from spread in values of the straw diameters (±0.15 mm) * Straw and anode wire placement precision are not depend by assembling accuracy procedures but the chamber and end plugs produce accuracy only.

  12. Straw assembly drawing Straw with different diameters can be used!

  13. The assembled straw at the flanges

  14. New method of the straw support

  15. Device for straw failure individual protecting

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