Submerged Arc Welding Technical Handbook - Esab

Heavy mill scale - not all fabricators
remove it from the weld area
OK Flux 10.88 on rusty plate with mill scale. Porosity-free, shiny weld
appearance. Clean weld with no indication of slag residues adhered
onto the bead or along the toes of the weld.
If you need to weld plate with rust, mill
scale, moisture or dirt, then OK Flux 10.88
is the flux to use. Welds produced with
other fluxes will give pock marks and
porosity.
OK Flux 10.88 is specifically designed to
cope with poor surface conditions. It is
tolerant to surface contaminants and gives a
smooth, defect-free weld appearance, even
at higher welding speeds. Due to its alloying
concept, the plate thickness in multi layer
welding is limited to about 30 mm.
several layers above 30mm plate thickness,
an aluminate-basic flux, such as OK Flux
10.78, is recommended. It is also developed
specifically for unclean plates.
OK Flux 10.88 is an easy to weld rutile flux
with a wide parameter envelope, giving
-20°C toughness with standard C-Mn
alloyed wires. It combines excellent
weldability and slag detachability with
sufficient toughness for many applications.
Poor surface conditions can also be found
on the joint preparation of plates for multi
layer welding. For multi-pass welding with
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