ELECTRON BEAM WELDING IN DRDL

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Development of Electron Beam welding for similar
and dissimilar joints of 9Cr-1Mo Steel and
Stainless Steel 316L(N)
CVS Murthy1 P Mastanaiah1 Shaju K
Albert2 Chitta Ranjan Das2 Dasarath Ram1
AK Bhaduri2 1 Defence Research and
Development Laboratory, Hyderabad 2 Indira
Gandhi Center for Atomic Research, Kalpakkam
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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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EXPERIMENTATION
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EB Welding Parameters
Beam Current 98 mA
Gun Voltage 55kV
Welding speed 1 m/min
Gun to work distance 283mm
Focus Below the surface
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
9Cr-1Mo Steel to 9Cr-1Mo Steel
SS316L(N) to SS316L(N)
9Cr-1Mo Steel to SS316L(N)
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TENSILE PROPERTIES

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MICROHARDNESS
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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 to 9Cr-1Mo steel 160
SS316LN to SS316LN gt 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 BPVC 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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Macro/Micro structures of SS316L(N) EB Welds
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THANK YOU