Page 55 - SSAB Welding Handbook Edition 2

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Welding handbook 9.0 Weldox and Hardox shop primers

9.0 Hardox and Strenx shop primers
©SSAB

SSAB can provide the Hardox and Strenx grades
with a shop primer that provides an effective
corrosion protection of each plate during storage,
transportation and fabrication.

Shop primed plates in the Hardox and Strenx grades
are coated with an inorganic low zinc silicate primer,
which is illustrated in fig. 9.1. Depending on the
thickness of the primer film applied, different
corrosion protection durations are attained. Two
alternatives exist. The primer can provide a
protection from corrosion for either three months
or six months. The thickness of the primer is
approximately10-15 μm. The three-month
protection represents thinner primer thicknesses
and the six-month protection thicker primer Fig. 9.1: The standard primer colors are red for Hardox and gray for
thicknesses of this interval. The plates that SSAB Strenx.
keeps in stock are always painted with a primer
thickness corresponding to a minimum of six
months of corrosion protection. Additional The principal advantages with this measure
information regarding the general properties of are that:
primed plates in Hardox and Strenx grades are 4 The level of porosity in the weld metal can be
found in TechSupport no. 25 at www.ssab.com. lowered. For stringent requirements regarding low
If requested, the primer is easily removed from the porosity levels, SSAB proposes that the primer is
parts of the plate that will be subjected to removed prior to welding. In comparison, welding
cutting and/or welding by, for example, a brush a joint without primer can achieve porosity levels
or a grinding tool. down to zero. Evaluations of fillet welds that are
welded in the horizontal position, where the primer
remains in the joint, show that the porosity is
9.1 Welding of shop primed plates typically up to some percentage of the total volume
of weld metal. These results are attained for both
Welding can be performed with or without leaving of the primer alternatives. In general, the primer
the primer in the joint. When the primer is left on, with a three-month corrosion protection supports
it is possible to attain advantageous results of the lower porosity than the primer with a six-month
general properties in the joint. It is also feasible to corrosion protection.
perform welding with the same parameters as for a
joint without a primer. However, the outcome may be
further improved if the primer is removed from the
joint and the adjacent surroundings prior to welding.

This handbook contains general suggestions and information without any expressed or implied warranty of any kind. SSAB hereby expressly disclaims
all liability of any kind, including any damages, in connection with the use of the information and for their suitability for individual applications. 55
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.