Submerged Arc Welding Technical Handbook - Esab

OK Flux 10.47 & OK Tubrod 15.24S
basic cored wire - no re-baking of
flux and high productivity
The use of a basic cored wire,
instead of a solid wire, allows
the weld metal toughness
properties to be engineered
through the cored wire rather
than through a highly basic flux.
This opens the way to the use
of a lower basicity fused flux
with a very low moisture content
and a moisture re-absorption
rate close to zero, which is
undoubtedly, the biggest
advantage for applications
where low weld metal hydrogen
contents are crucial. This
enables the flux to be used
without the costly, and timeconsuming
procedure of
re-baking.
As with gas-shielded cored
wires, the metal sheath
conducts the current, instead
of the complete wire cross
section resulting in a higher
current density. This higher
current density is converted to
increased deposition rates and,
therefore, productivity.
Weldability characteristics are
excellent; comparable to the
best basic agglomerated fluxes
available on the market. Slag
release is very good even in the
bottom of tight butt joints near
the root area, enabling the joint
angle to be reduced.
Due to the glass nature of the
flux, the grain strength is
significantly higher than that of
the fully basic agglomerated
fluxes. This results in less
breakdown and hence no
problems with “dusting” and
therefore all round improved
recycling.
Mechanical values fulfil most
offshore requirements:
Diffusible Hydrogen (ml/100g)
10.0
Toughness (J)
8.0
6.0
4.0
2..0
0.0
0 2 4 6 8 10 12 14
Days
OK-Tubrod 15.24S / OK10.47 -
AWS All-weld metal toughness
-70 -50 -30 -10 10 30
Temperature ( 0 C)
AWS All-weld metal procedure
Deposition rate (kg/h)
20
18
16
14
12
10
8
6
4
2
Climatic Exposure Results
Diffusible hydrogen exposure tests
OK Flux 10.47 with Tubrod 15.24S 4.0mm
600 amps, 30mm Stickout, 30V
Exposure@19g H 2 0 m -3 (25 0 C 80%RH)
250
200
150
100
50
0
15.00S 2.4mm
15.00S 3mm
15.00S 4mm
12.20 2.5mm
12.20 3mm
12.20 4mm
0
300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000
Current (A)
4.0mm
3.0mm
2.4mm
Deposition rate comparison OK Tubrod 15.00S and
OK Autrod 12.20 / OK Flux 10.71.
Increased deposition on 50mm plate
Productivity increase of 30%
Solid wire 48 runs
OK Tubrod 15.24S 37 runs
22