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Welding handbook 7.0 Aspects regarding static strength in joints

7.0 Aspects regarding static strength in joints
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The requirements regarding static strength in joints In many cases, joints that consist of only Strenx 700
are mostly related to the Strenx grades. As a general are welded, including all weld passes, with low-
characteristic, joints in these steel grades can achieve alloyed consumables that have the same yield
very high static strengths. The Hardox grades can strength in the all weld metal as the unaffected
also attain favorable strengths, even if they are not as parent metal. Typically, for a fully penetrated butt
high as the Strenx grades. joint, the tensile strength transverse to the direction
of the complete joint matches the tensile strength
The static strength of the complete joint depends on requirement for the unaffected parent metal of
the properties of the individual parts in the joint, Strenx 700.
which in this case, means the characteristics of the
HAZ, the weld metal, the unaffected parent metal In structures made with Strenx 900- Strenx 1300,
and their interactions with each other. the joint is often welded throughout with low-
alloyed consumables that have the highest accessible
As accounted for in chapter 5, each part of the strengths. This means using consumables with yields
HAZ is subjected to a unique heat treatment from strength of approximately 900 MPa in the all weld
the welding performance, which causes the local metal. In these situations, fully penetrated butt joints
mechanical properties to vary throughout the HAZ. that include the same Strenx grade will attain tensile
This includes the static strength throughout the strengths as follows:
HAZ, where parts of the HAZ will typically have 4 Joints made with Strenx 900- Strenx 960 can in
a lower static strength than the unaffected parent many cases typically fulfill the tensile strength
metal. requirements for the unaffected parent metal of
the specific Strenx grade.
However, when the lowest strength in the joint is 4 Joints made with Strenx 1100- Strenx 1300 have
in the HAZ, the tensile strength transverse to the a typical tensile strength that is somewhat below
complete joint can be higher than the part of the the specified tensile strength of the
HAZ with the lowest strength. In simplified terms, unaffected parent metal of the included
if the section with the lowest strength is narrow, Strenx grade.
the surrounding areas of higher strength interact
with each other to strengthen the entire joint. This
issue occurs frequently for joints in the Hardox and Hardox grades are welded with unalloyed, low-
Strenx grades. alloyed and stainless consumables with yield strengths
up to 500 MPa. A completely penetrated butt joint that
includes plates of the same Hardox grade normally
achieves a tensile strength, measured transverse to the
joint direction, which is between the tensile strength
of the unaffected parent metal and the tensile strength
of the consumable being used. Updated information
regarding typical static strengths in joints of Strenx
grades is found in TechSupport no. 64 which is
available at www.ssab.com

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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. 43
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.