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CVS Murthy1 P Mastanaiah1 Shaju K Albert2 Chitta Ranjan Das2 Dasarath Ram1 AK Bhaduri2
1 Defence Research and Development Laboratory, Hyderabad2 Indira Gandhi Center for Atomic Research, Kalpakkam
Development of Electron Beam welding for similar and dissimilar joints of 9Cr-1Mo Steel and Stainless Steel 316L(N)
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Collaborative Project - IGCAR & DRDL
• EB Welding of SS316 LN to SS316L(N)• EB Welding of 9Cr-1Mo Steel to 9Cr-1Mo Steel• EB Welding of 9Cr-1Mo Steel to SS316L(N)• EB Welding of LAFM Steel to SS316L(N)
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• Tensile Test• Charpy V-notch Impact Test• Bend (face/root) Test• Microhardness
EBW
9Cr-1Mo Steel to 9Cr-1Mo Steel
SS316L(N) to SS316L(N)
9Cr-1Mo Steel to SS316L(N)
EXPERIMENTATION
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EB Welding Parameters
Beam Current 115mA
Gun Voltage 55kV
Welding speed 1 m/min
Gun to work distance
283mm
Focus Below the surface
Beam Current 95mA
Gun Voltage 55kV
Welding speed 1 m/min
Gun to work distance
283mm
Focus Below the surface
Beam Current 98 mA
Gun Voltage 55kV
Welding speed 1 m/min
Gun to work distance
283mm
Focus Below the surface
9Cr-1Mo Steel to 9Cr-1Mo Steel
SS316L(N) to SS316L(N)
9Cr-1Mo Steel to SS316L(N)
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TENSILE PROPERTIES
0
100
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Te
nsi
le S
tre
ng
th, M
Pa
Specimens
316L(N)SS base 9Cr-1Mo base 316L(N)SS-316L(N)SS join 9Cr-1Mo-316L(N)SS join 9Cr-1Mo-9Cr-1Mo join
0
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Yie
ld S
tre
ng
th, M
Pa
Specimens
316L(N)SS base 9Cr-1Mo base 9Cr-1Mo-316L(N)SS join 9Cr-1Mo-9Cr-1Mo join 316L(N)SS-316L(N)SS join
0 5 10 15 20 25 30 35 40 45 50 55 60 65 700
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En
gg. S
tren
gth
, MP
a
Total El, %
9Cr-1Mo base 316 L(N) SS 316L(N)-316L(N) SS join 9Cr-1Mo-9Cr-1Mo join 9Cr-1Mo-316L(N) SS join
•
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MICROHARDNESS
-3 -2 -1 0 1 2 3 4 5
150
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250
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350
400
450 InterfaceInterface
9Cr-1Mo steel316L(N) SS
Har
dnes
s, V
HN
500g
Distance across the weld interface, mm
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.50
50
100
150
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316L(N)SS316L(N) SS Weld metal
Ha
rdn
ess
, VH
N50
0g
Distance across the weld interface, mm
-1.0 -0.5 0.0 0.5 1.0 1.5
200
250
300
350
400
450
9Cr-1Mo steelInterafce
Weld metal
Har
dnes
s, V
HN
500g
Distance across the weld interface, mm
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Charpy V-notch Impact Test
Type of EB Weld Impact Energy (J)
9Cr-1Mo steel to SS316LN
265
9Cr-1Mo steel to9Cr-1Mo steel
160
SS316LN to SS316LN > 300
Temperature : 21.50C
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Bend Test
EB Welds of SS316LN and 9Cr-1Mo Steel • Three point bend test• Specimen prepared as per ASME B&PVC Code Section IX
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Bend Test
Bend specimens - Dissimilar EB Weld
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Macrostructure of weld of 9Cr-1Mo Steel
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Macrostructures of Dissimilar Weld
• Lack of sidewall fusion / crack observed at the SS316 weld interface
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SS EB weld
Macrostructure of EB Weld of SS316L(N)
Macro/Micro structures of SS316L(N) EB Welds
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THANK YOU