In the steel structure construction, the welding distortion directly affects the steel component, the steel structure installment and its use function. And the load has an additional bending moment, secondary stress, which indirectly affect the use of steel structure performance, so the control of welding deformation is very important.
According to causes and influencing factors of welding deformation, the following measures can be taken to control the deformation:
1. To reduce the weld cross-sectional area
2. as much as possible use multi-layer welding instead of single-layer welding in thick plate welding.
3. In the case of meet the design requirements, the longitudinal stiffeners and transverse stiffener welding can be intermittent welding method.
4. Double-sided welding operation can be used to double-sided symmetrical groove.
5. the use of open groove angle butt weld when T-shaped joints thicker.
6. Using the pre-weld inverse deformation method to control the post-weld angular distortion
7. For the the twist of long component, mainly to improving the flatness of sheet metal and component assembly accuracy, to make the groove angle and the gap is accurate.
8. Design to decrease the number and size of welds; reasonable layout of the weld.
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