Welding Engineers NZ Ltd supply a wide range of flux cored wires (FCW) and are the sole authorised NZ agent for Kobelco Welding (KW), Nippon Steel & Sumikin Welding (NSSW) and Chosun flux cored welding wires.

If welding with a solid MIG wire works, why change to a higher priced flux-cored wire?

The flux in the core of FCWs combine a number of ingredients which are specific for the welding application or performance enhancement each wire is designed for.

Common flux ingredients include slag formers to shield the weld pool and shape and support the weld, powdered alloys to form low-alloy deposits or improve the mechanical properties, scavengers and fluxing agents to clean up impurities on the weld metal. Iron powder is used to increase deposition rates and the flux of metal cored wires is almost entirely iron powder.

For most welding applications like vertical-up welding, flat welding, welding over galvanised, or welding hard-to-weld steels, a correctly selected FCW can do it better and faster than a solid wire.

As subsidaries of two of the world's major steel manufacturers, KW and NSSW have access to the highest ‘A’ grade green bar steel to use as the base metal in production of their welding consumables. They can also add fluxing agents to the steel itself during manufacture of the green bar, in addition to the agents in the flux core, which allows greater specificity for targeted performance.

As with most products, there is a variation of quality and performance across wires and brands, ask to trial and choose wisely.

Optimising the efficiency of the welding job by choosing the best quality FCW you can will pay off in the overall cost of the job:

Faster, more efficient, better quality welding will decrease the largest cost component of your work – Labour.


AWS : A5.20 E71T-1C

SF1 is an all-positional, seamless flux cored wire with a high deposition rate, easy and clean to weld.

Superior Japanese quality.

Suitable for welding mild steel and 490MPa high tensile strength steel for machinery, non-seismic structures, etc.

Available in 1.2mm and 1.4mm diameter.


AWS : A5.36 E71T1-C1A2-CS1     

ISO : 17632-A: T42 2 Z P C 1 H5

Nippon SF1e is an all-positional, seamless, copper-coated flux cored welding wire manufactured in Japan to exacting high standards.

One of the best, if not the best, wires for structural fabrication, ship building, bridges, etc. 


AWS : A5.22  E309LMoTo-1/4

ISO : 17633-A T 23 12 2 L R C/M 3

 Flux cored mig wire for welding stainless or dissimilar metals.

Kobe DW309MoL is very stable with a spatter free arc, high quality weld appearance and self-releasing slag.

AWS : 5.22 E316LT0-1/-4

ISO : 17633-A T 19 12 3 L R C/M 3

Kobe DW316L is a highly recommended flux cored wire for welding stainless steel, can be used with CO2 or Argon CO2 mix. 

Noted for very stable, spatter free arcs producing bright, smooth weld bead surfaces and self releasing slag.

KOBE DW50 1.2MM (15KG)

AWS : A5.20 E71T-1C/1M, -9C/9M

ISO : 17632-A - T 42 2 P C/M 1 H5

Kobe DW-50 is a seismic grade 3, all-positional, flux cored wire great for out-of-position work in structural fabrication.

Versatile, easy to use, suitable for use with high currents with both CO2 and mixed gases.

Also very good on galvanised steel.

KOBE DW100 1.2MM (20KG)

AWS : A5.20 E71T-1C

ISO : 17632-A: T42 0 P C 1 H10

Japanese precision layer wound, titania type flux cored wire suitable for all-positional welding. 

DW100 is a superb wire for out-of-position work, smooth and buttery, and the stable arc makes it a forgiving wire.

CHOSUN CSF-309MOL 1.2MM (12.5KG)

AWS : A5.22 E309LT0(1)-1/-4

Quality flux cored wire for welding 309 stainless steel and dissimilar metals made in Korea. 

CSF-309MoL(P) is suitable for welding of 22%Cr-12%Ni-2%Mo steel and heat resistant steel and dissimilar joints such as a stainless steel to carbon steel of low alloy steel.

Also suitable for under layer welding of stainless steel on carbon steel.

CHOSUN CSF-316L 1.2MM (12.5KG)

AWS : A5.22 E316LT0(1)-1/-4

ISO 17633-A T 19 12 3 L R C1[M21] 3
ISO 17633-B TS 316L-F C1[M21] 0

Flux-cored wire suitable for welding of low carbon 18%Cr-12%Ni-2%Mo stainless steel.

Fillet, all-positional welding, CO2 gas.

CHOSUN CSF-600H 1.2MM (20KG)
CHO CSF-600H12

 Flux cored wire for hard-facing in high wear applications


AWS : E71T-1C, -M

ISO : 17632-A: T42 0 P C[M] 1 H10

All-positional flux cored wire suitable for butt, fillet welding of mild steel and high tensile strength steels in structural work.


AWS : 5.20 E71T-9C          

ISO : 17632-A: T46 3 P C 1

Seismic Grade 3 and all-positional, flux cored wire designed for butt and fillet welding high strength and low temperature steels, particularly for structural work.

AWS : A5.20 E71T

Good wire for home or small workshops, available in 0.6 - 0.9mm diameter.

All positional, self-shielding (gasless), and  easy to use.

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