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Welding handbook 20.0 Hardfacing

20.0 Hardfacing
©SSAB

Hardfacing is a procedure where weld passes are can be used and hardfacing can be welded on to the
welded on to the surface of the steel. The purpose part of the structure that is exposed to the increased
of this measure is to give the structure a higher wear wear.
resistance. A picture of a steel surface subjected to
hardfacing is illustrated in fig. 20.1. Before performing a hardfacing procedure for a
Hardox or Strenx grade, the type of wear must
be determined in order to choose the appropriate
welding consumable. From the perspective of
hardfacing technology, the different types of wear
are normally related to the characteristics of the
consumables for the hardfacing layer. The relevant
categories of hardfacing consumables for welding of
the Hardox and Strenx grades are normally divided
according to the following principal wear segments:
4 Impact wear occurs during impingement of solid
bodies, as in the case of solid rocks striking the
surface, see fig. 20.2. This kind of wear is
characterized by severe pounding which tends to
deform and, in some cases, break away the surface.

Fig. 20.1: Hardfacing of Hardox.

Hardfacing is a general measure that can be applied
to structures of different steel grades. However, high
strength steels such as Hardox and Strenx are not
frequently subjected to hardfacing because, by design,
they already have a very high resistance to wear.
There are also potential drawbacks involved with
hardfacing, which are discussed further on in this
chapter. When hardfacing is performed, it is mostly
done for the Hardox grades due to their use in high
wear applications. Fig. 20.2: Impact wear.

One instance in which a Hardox application can
benefit from hardfacing is when there is localized
wear on one part of the structure. In this situation,
a Hardox grade with a relatively moderate hardness

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all liability of any kind, including any damages, in connection with the use of the information and for their suitability for individual applications. 117
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.