risky heating
risky heating
(OP)
I am working with a company that is welding grade 80 plates into very long tube sections. They use four grade 80 plates (20" x 30') and weld them into a box. The plates come precut from a vendor, and occasionally the plates are warped or bent. Also, more bending occurs during welding. To straighten the tubes after welding they heat the tube sections at different points and then air cool. This does a good job of relaxing the tube and straightening things out, but I am worried they are compromising the structural integrity of their grade 80 plate? Am I correct? Is there a way of estimating the effect of heating the plates (change in E or YS?)?





RE: risky heating
What condition is received in ?
Is the person doing the heating straightening well versed in the art?
Are you welding at four corners?
Normally straighten warped steel you don't use enough heat to affect the physical properties. This is especially true if you are air cooling. Also any change would be less than what you see in the HAZ of the weld.
Her is a very good inexpensive book by Omer Blodgett that has section on controlling distortion.
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RE: risky heating
To what temperature??
RE: risky heating
RE: risky heating
Here are my thoughts - uncontrolled heating (no specified maximum temperature range, no specified ramp up or cool down or procedure to document this activity) results in unpredictable mechanical properties to the Grade 80 base material.
RE: risky heating
htt