straight pole light
straight pole light
(OP)
hello
how i can calculate the force required to straight light pole after welding if i have a diameter 200mm
how i can calculate the force required to straight light pole after welding if i have a diameter 200mm





RE: straight pole light
Perhaps you mean "straighten"?
What did you weld, how did you weld it, and how far out of straight is it? Do you have a photo or sketch?
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JHG
RE: straight pole light
RE: straight pole light
"I need to straight light pole after welding process because the pole after welding become a deflection ( banana effect )(no straight)then i need to determine the force to return the pole straight by hydraulic press .
the pole have curricular cross section with diameter 200mm and 5mm thickness and material is A36 steel. and length the pole is 12 m"
Until we know how it's deformed, there is not much that can be done to help.
Other than to say that A36 steel has a yield strength of 250MPa.
If we assume that its bent in the middle, supported at both ends, it will need 500N to deflect 4.95m. However, I can't imagine its that straight forward though.
He just needs a big press, suggest he gets a 5 ton bench press or, as has been suggested in the other forum, change the welding process.
RE: straight pole light
Actually, it is not that simple. Welding along a beam bends it into a circle segment. Applying force in the middle and at the ends creates a non-constant bending moment, and a resulting non-constant radius, especially since some of the bending will be elastic.
Could they apply a weld bead on the side opposite the original weld?
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JHG
RE: straight pole light
No affilation
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: straight pole light
You seem to confusing me with someone that cares.
This person has posted an obscure and random question with no data to allow us to help.
I really don't care how he or she sorts it out.
RE: straight pole light
this not random question and really its not simple as you imagine. and yes "I need to straighten light pole after welding process because the pole after welding become a deflection ( banana effect )(no straighten)then i need to determine the force to return the pole straight by hydraulic press,
the pole have curricular cross section with diameter 200mm and 5mm thickness and material is A36 steel. and length the pole is 12m.
and the weld process its automatic along the pole
thanks
RE: straight pole light
B.E.
You are judged not by what you know, but by what you can do.
RE: straight pole light
Alternatively you could hammer the weld to cause the required deformation by thinning the weld material.
The advantage to hammering is that near the ends of the tube the leverage available becomes smaller; it is zero at the end, which means the required load to produce a moment become infinite.
RE: straight pole light
http://www.fhwa.dot.gov/bridge/steel/02.cfm
RE: straight pole light
Bending the pole like a cantilever beam does not result in a constant moment along the full length. Read up on plastic hinges.
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JHG
RE: straight pole light
Since the distortion is from a localized shrinkage from the welding material a localized hammering will expand the metal in a useful direction and eliminate the bend and this can be done at any location, including the ends.
RE: straight pole light
RE: straight pole light
It would help to know how close to straight the final pole needs to be ( and why ).
RE: straight pole light
B.E.
You are judged not by what you know, but by what you can do.