Seamless Flux Cored Wire

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SeamlessFlux Cored Wire
NITTETSU SF/SM series
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What is Seamless FCW ?
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Production of Seamless FCW
Vibration flux filling process ltUntil 1998gt
Drawing
Drawing
Copper plating
Flux filling by vibration
Dehydrogenation annealing
Spooling
Pipe
Intermediate size
Product size (1.22.0f)
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New Production Process of NSSW
Inline-Continuous-flux-Filling process (ICF)
Roll forming
Seam welding (ERW)
Flux filling
Strip
?
Welding
Dehydrogenation annealing
Copper plating
Spooling
Drawing
Drawing
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ICF Process
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Story of our Seamless FCW
1981 Start of NITTETSU SF-1 1991 Started
operation H-ICF (Hikari plant) 1998 Started
operation N-ICF1(Narashino plant) 2008 Started
operation N-ICF2(Narashino plant)
Three ICF production lines are expected to
supply seamless FCW toward all of the world
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The Biggest Seamless FCWsales supplier
Sales of Seamless FCW in 2008
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Performances of NITTETSU Seamless FCW
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Feat.1Ultra-low hydrogen can be achieved
Because of Seamless
No open gap in the wire
Dehydrogenation annealing process
Copper plating
Ultra-low diffusible hydrogen FCW
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Feat.2Moisture absorption can be prevented
Steel sheath
Flux
NITTETSU SF-60
Keeping HD after unpacking
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Feat.3Rust can be prevented
Fold type (No copper plating)
Seamless (Copper plated)
Easy storage
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Feat.4Low temp. cracking can be prevented easily
Seamless FCW

• Dehydrogenation process
• No moisture absorption
• High rust prevention property

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Relation between critical preheat temp. and weld
metal diffusible hydrogen
y-groove weld cracking test
Seamless can decrease preheat temp.
Critical preheat temperature (deg.C)
Yurioka, Kasuya Quarterly Journal of Japan
Welding Society,Vol.13 No.3, pp347-357 (1995)
Weld metal diffusible hydrogen (ml/100gr)
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Investigation of targeting performance
(Wire dia.1.2mm palepack, straight torch,
Ext.150mm )
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Feat.5Targeting point is extremely stable
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Feat.6Less tip abrasion
(Circumscribed circle of tip hole after
welding) (Diameter of the tip hole before
welding)
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Sales of NSSWs Seamless FCW
Over 3,000 ton/month
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Advanced Technology in Regard to Steel and
Welding Materials for Customers
Anti-low temp. cracking property
Ultra-low hydrogen process
Rust prevention
No moisture absorption
excellent targeting performance
Less tip abrasion