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Weld observations

Weld observations. Presented by: De Carlo Livio Supervisor: Scheubel Maud Section: EN/MME-MM.

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Weld observations

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  1. Weld observations Presented by: De Carlo Livio Supervisor: Scheubel Maud Section: EN/MME-MM

  2. Type: Hostaphan RNK 2600 HostaphanRNK 2600 HostaphanRNK 2600From: SefarSefarJINRDate: September 2010 December 2010 January 2011Samples: 6 2 (S1=#89 & S2=#89_2) 2 (R1=#047 & R2=#002) • Observations with stereomicroscope • Both sides (coated and chemically treated) and cross section • Observations with optical microscope • Polished cross section • Tensile tests • 10*31 mm

  3. Stereomicroscope observations Type 3 6 samples from Sefar September 2 samples from Sefar December Type 2 Type 1 4 samples presented a weld like: 2 samples presented a weld like: Length: 0,8 to 0,9 mm Thickness: 55 to 60 μm 2 samples from JINRJanuary Length: 0,9 mm Thickness: 60 to 70 μm Critical section: - Thickness: 30 μm to 45 μm - Length: 110 μm to 170 μm Length: 0,3 mm Thickness: 60 to 70 μm Extremities not correctly welded Length: 0,6 mm Thickness 50 to 90 μm Length: 0,9 mm Thickness: 64 μm

  4. Tensile tests 6 samples from Sefar September 2 samples from Sefar December and 2 samples from JINRJanuary S2 S1 R2 R1 1bis 1 3 2 4 5

  5. Tensile test results 6 samples from Sefar September 2 samples from Sefar December and 2 samples from JINRJanuary

  6. Stereomicroscope observations after tensile test 6 samples from Sefar September Type 1 Type 2 Failure in the critical section Unsticking of the two extremities

  7. Stereomicroscope observations after tensile test 2 samples from Sefar December 2 samples from JINRJanuary Type 3 Type 2 S1: Failure in the weld R1: Failure outside the weld S2: Failure outside the weld but apparition of a crack R2: Failure outside the weld but apparition of a crack Elongation Elongation

  8. Optical microscope observations 6 samples from Sefar September 2 samples from Sefar December Melted area not visible 2 samples from JINRJanuary

  9. Optical microscope observations Melted area measurements SEFAR2

  10. Optical microscope observations Length measurements SEFAR 1 DUBNA2

  11. Optical microscope observations Thickness measurements DUBNA 1 Sefar 1: Failure in the weld Comment: No a significant reduction of thickness in the weld, failure happens suddenly Sefar 2: No failure but apparition of an elongation JINR1: No failure and no elongation in the weld JINR2: No failure but apparition of an elongation Comment: Slight reduction but not significant Comment: The reduction of section is more visible Comment: No significant reduction

  12. Optical microscope observation Width outside the weld measurements DUBNA 1 Comment: • Thickness of 36 to 37 µm =>No measurable reduction lower than 1µm

  13. Conclusions • Improvement in weld formation by Sefar (September to December) and JINR • JINRweld has the same behavior at the failure than Sefar December • 1 / 2 of weld Sefar December resist to the tensile test • 2 / 2 of weld JINRresist to the tensile test • All results should be confirm by next observations

  14. Next step • Observations of four samples from Sefar December 2010/ Sefar January 2011/ JINR to be delivered Optical analyze Optical analyze Tensile test 4X Sections comparison

  15. Thank you for your attention

  16. Tensile test results: 6 samples from Sefar September 2 samples from Sefar December and 2 samples from Dubna January

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