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Welding handbook 13.0 Distortions in joints

13.0 Distortions in joints
©SSAB

There is a natural tendency for distortions to occur 13.1 Mechanisms behind the
during arc welding and the Hardox and Strenx formation of distortions
grades are no exception in this respect. Sometimes
the distortions need to be corrected which means Stresses that cause distortions are formed by the
that further work and costs are encountered. same factors that cause residual stresses in the joint,
However, the levels of distortions that emerge due described in chapter 4. As such, the basis for their
to welding can be decreased if suitable measures occurrence is a welding performance that creates
are taken during the: a non-uniform heat treatment in and around the
weldment.
4Design of the structure
4Planning and execution of the welding performance
Distortions can develop in the structure during cooling
for up to 0.5 h-1 h after the completion of welding.
In this chapter, issues regarding the emergence of The dimensional changes that occur are related to one
distortions and how to keep them at reasonably low or more of the appearences displayed in fig. 13.1.
levels are addressed.

Angular distortion Transverse distortion Longitudinal distortion
Longitudinal distortion

Z

Y
X

Bowing distortion Buckling distortion Twisted distortion

Fig. 13.1: Frequent principal directions of distortions in welded structures.

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