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0 If you have ever seen a steel frame land off the bench still slightly twisted or bowed, it is not because the fabricator let one get past them. This heat leads to warping as a matter of fact. Welding introduces a highly concentrated thermal energy into the metal, and steel expands with heat then essentially shrinks as it becomes cool. If the steel cools at different rates in different areas, it can warp. For a Fabrication Company Gloucester, visit www.mber.uk/steel-services/fabrication-gloucester
Why warping happens
Common causes include:
External heating imbalance (one end has a higher temperature than the other)
Welds that shrinks while cooling
Bad fit-up that requires additional weld (more heat)
Forces on the work are caused by a movement of pulling direction from welding.
How fabricators prevent distortion
Smart fabricators think of distortion well before the first arc is struck. Typical methods include:
Tack welding and clamping to hold parts in place
Jigs and fixtures to hold parts squarely in place
Balanced welding (welding on opposite sides to balance pull)
Appropriate use of stitch welding (or shorter runs)
Controlled weld sequence (weld every part of the job completely vs move around)
Pre-setting pieces a little “off” so that they pull into the correct place as they cool.
What clients can do to help
Having clear drawings, realistic tolerances as well as early detail approval prevents late changes that commonly cause distortion challenges.
Warping is manageable. Well-executed preparation, sequencing and checks means that with the right fabrication process you can end up with steelwork which fits well on site and probably also looks just as good.
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