Page 40 - SSAB Welding Handbook Edition 2

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6.0 The choice of consumables Welding handbook

Consumables used for Strenx 960 - Strenx 1300 6.3 The toughness values in the weld
have lower yield strength than the unaffected parent metal
©SSAB
metal. This is because consumables with a yield
strength of around 930 MPa in the all weld metal The consumables with the appropriate strengths for
represent the highest available yield strength on the welding the Hardox and Strenx grades can, in many
market for welding of construction steels. cases, attain favorable toughness values in the all
weld metal. The weld metal in joints of the Strenx
Using consumables with a lower maximum strength grades can reach an impact toughness – with many
than in fig. 6.1 can benefit the Strenx grades with kinds of consumables – that is typically above the
advantages such as increased toughness in the toughness requirements of the unaffected parent
weld metal, lower residual stresses, and enhanced metal.
resistance to hydrogen cracks in the joint.
There are seldom exact, specified toughness

When welding multi-pass joints in the Strenx requirements for joints in the Hardox grades.
grades, it can be beneficial to weld the first passes When measured, the impact toughness values in
with lower strength consumables and the filler the weld metal are normally at a level of – or
passes with higher strength consumables. This will above – the typical impact toughness values for
give an extra high resistance towards hydrogen these steel grades.
cracks.

The level of static strength in joints of the Hardox 6.4 The maximum hydrogen content
grades is normally not as crucial as for joints in the in the consumables
Strenx grades. A more important issue with these Hydrogen is always added to the joint during arc
steel grades is to reduce the risk for hydrogen cracks welding. The issue is to keep the hydrogen level
in the joint. Welding with consumables of relatively low enough to minimize the risk of hydrogen cracks
low yield strength supports this matter. Suitable forming in the joint. One source of hydrogen is
yield strengths of consumables for welding the the consumable. Each type of consumable has
Hardox grades are according to fig. 6.2. individual characteristics regarding its hydrogen
potential.

R [MPa]
p0.2 Sources for hydrogen in the consumables are:
4 The cover for consumables for MMA welding
600 and fluxes for SAW have minerals that bind

moisture
500 4 Drawing lubricants that are applied during
manufacturing of cored wires
4Moisture from the surrounding environment
400

The recommendation for the Hardox and Strenx
grades is to choose consumables that can achieve
Hardox HiTemp
Hardox HiTuf Hardox 450 Hardox 500 Hardox 500Tuf Hardox 600 Hardox Extreme diffusible hydrogen contents of a maximum of
Hardox 400
Hardox 550
5 ml H /100 g of weld metal. There are consumables
2
available for all the welding methods that can fulfill
Fig. 6.2: Recommended static strengths in the all weld metal for these hydrogen requirements.
consumables suitable for the Hardox grades.

40 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.
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.