Page 79 - SSAB Welding Handbook Edition 2

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Welding handbook 13.0 Distortions in joints

The use of back step or skip welding Software for analyses of distortions
techniques Predictions of distortions in joints are feasible with
Experience has shown that welding the joint in computerized methods based on fenite element
smaller sections backward to the general progression models (FEM). The software available for these
may result in reduced distortions. This method is purposes is continuously being developed. If this
utilized in the back step and skip welding techniques, kind of calculation method is to be used, it is a good
according to fig. 13.9. practice to first evaluate the software of interest.
An assessment of the software can, for instance, be
In these techniques, the length of each weld sequence made in order to find out if sufficient results can
can be adapted in order suit the actual welding be attained compared to actual measurements of
situation. As an example, if welding is performed with distortions in joints.
MMA, the length of each welding sequence can be set
to the run out length for the individual consumable.
Straightening of distortions

6 After welding, straightening of the structure using
5
Welding direction 2 3 4 General progression mechanical straightening methods is sometimes
necessary.

1 Thermal straightening methods are not normally
recommended for the Hardox and Strenx grades.
a) ©SSAB
Strenx 700-Strenx 960 as well as Hardox HiTuf
and Hardox HiTemp can, in some special cases, be
straightened by thermal methods. Contact SSAB for
6
3
Welding direction 2 5 further information on this matter.
4 General progression
1
b)

Fig. 13.9: Illustration of back step and skip welding techniques.

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. 79
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.