weld observations
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Weld observations. Presented by: De Carlo Livio Supervisor: Scheubel Maud Section: EN/MME-MM. - PowerPoint PPT PresentationTRANSCRIPT
WELD OBSERVATIONS
Presented by: De Carlo Livio
Supervisor: Scheubel MaudSection: EN/MME-MM
Type: Hostaphan RNK 2600 Hostaphan RNK 2600 Hostaphan RNK 2600From: Sefar Sefar JINRDate: 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
Stereomicroscope observations
• 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
4 samples presented a weld like: 2 samples presented a weld like:
Type 1 Type 2
6 samples from Sefar September 2 samples from Sefar December Type 3
2 samples from JINR January Length: 0,8 to 0,9 mm Thickness: 55 to 60 μm
Length: 0,9 mm Thickness: 64 μm Length: 0,6 mm Thickness 50 to 90 μm
Tensile tests
54
32
1
1bis
6 samples from Sefar September
S1R2
S2
R1
2 samples from Sefar December and 2 samples from JINR January
Tensile test results 6 samples from Sefar September
2 samples from Sefar December and 2 samples from JINR January
Hostaphan RNK 2600 welded and treated (36 µm)
Type Tensile strength (MPa)
Sample S1 Type 3 127,5Sample S2 Type 3 127,6Sample R1 Type 3 124,2Sample R2 Type 3 132,6
Hostaphan RNK 2600 welded and treated (36 µm)
Type Tensile strength (MPa)
Sample 1 Type 1 120,7 Sample 1bis Type 1 127,2 Sample 2 Type 2 109,6 Sample 3 Type 2 112,4 Sample 4 Type 1 107,2 Sample 5 Type 1 105.4
Stereomicroscope observations after tensile test
Unsticking of the two extremities
6 samples from Sefar September
Type 1
Failure in the critical section
Type 2
Stereomicroscope observations after tensile test
2 samples from Sefar DecemberType 2Type 3
2 samples from JINR January
S1: Failure in the weld
S2: Failure outside the weld but apparition of a crack
Elongation
R1: Failure outside the weld
R2: Failure outside the weld but apparition of a crack
Elongation
Optical microscope observations 6 samples from Sefar September 2 samples from Sefar December
2 samples from JINR January Melted area not visible
Optical microscope observations Melted area measurements
SEFAR2
Samples Bef. t.t (%) Aft t.t (%)
Sefar 1 42,6 36,7
Sefar 2 52,4 47,4
Dubna 1 49,0 49,0
Dubna 2 33,3 30,6
Optical microscope observations Length measurements
SEFAR1
DUBNA2
Samples Bef. t.t (μm)
Aft t.t (μm)
Elongation(µm)
Sefar 1 870 970 100
Sefar 2 860 910 50
Dubna 1 850 860 10
Dubna 2 550 600 50
Optical microscope observations Thickness measurements
DUBNA1
Sefar 1: Failure in the weld
Sefar 2: No failure but apparition of an elongation
Comment: No a significant reduction of thickness in the weld, failure happens suddenly
Comment: Slight reduction but not significant
JINR 1: No failure and no elongation in the weld
Comment: The reduction of section is more visible
JINR 2: No failure but apparition of an elongation
Comment:No significant reduction
Optical microscope observation Width outside the weld measurements
DUBNA1
Thickness (µm) Section 1 Section 2 Section 3 Section 4 Section 5 Section 6Point 1 36 36 36 36 36 36Point 2 37 36 37 36Point 3 37Point 4 37
Comment:
Thickness of 36 to 37 µm => No measurable reduction lower than 1 µm
Conclusions
Improvement in weld formation by Sefar (September to December) and JINR
JINR weld 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 JINR resist to the tensile test All results should be confirm by next
observations
Next step Observations of four samples from Sefar
December 2010/ Sefar January 2011/ JINR to be delivered
Optical analyze
Optical analyze
Tensile test
Sections comparison
4X
Thank you for your attention
Tensile test results:
Hostaphan RNK 2600 welded and treated (36 µm)
Type
Tensile strength (MPa)
Elongation at rupture (%)
Hostaphan RNK 2600 no welded and without deposit (36 µm)
Sample 1 Type 1 120,67 7,66
Sample 1bis Type 1 127,19 8,96
Sample 2 Type 2 109,54 / Tensile strength(MPa) 260-280
Sample 3 Type 2 112,36 /
Sample 4 Type 1 107,19 3,89 Elongation at rupture 25-40 %
Sample 5 Type 1 105.37 2,99
6 samples from Sefar September
2 samples from Sefar December and 2 samples from Dubna January Hostaphan RNK 2600 welded and treated (36 µm)
Tensile strength (MPa)
Elongation at rupture (%)
Sample S1 127,49 12,35 Sample S2 127,57 10,65 Sample R1 124,21 5,1 Sample R2 132,61 9,48