Page 23 - SSAB Welding Handbook Edition 2

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Welding handbook 4.0 Hydrogen cracks

Preheat levels for the Hardox and Strenx 4 All preheat temperatures in the diagram are valid
grades for welding with heat inputs of 1.7 kJ/mm or
©SSAB
higher.
The minimum recommended preheat temperatures
for the Hardox and Strenx grades are according to 4 The CET value for the steel is equal or above
fig. 4.5. Unless otherwise stated, these values are CET value for the consumable +0.03%. For other
applicable to welding with unalloyed and low-alloyed situations with unalloyed or low-alloyed
consumables. consumables, apply a minimum preheat
temperature that fulfils the requests from the
The conditions for application are that: included steels in the joint as well as for the
consumable being used.
4 The recommendations are based on the single plate
thickness of the joint, which is the largest plate 4 When different steel grades are welded together,
thickness in the joint, see fig. 4.4. the plate with the most stringent requirements
regarding preheat levels determines the minimum
and maximum preheat temperature.

The single plate thickness is t or t , is provided that
2
1
the same steel type is used.

The single plate thickness is t or t , is provided that
2
1
the same steel type is used.

In this case, the single plate thickness is t , provided
2
that the same steel type is used.

Fig. 4.4: Definition of the single plate thickness.

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. 23
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.