A question on spot-weld density on plates
A question on spot-weld density on plates
(OP)
Hi All,
I need a 6mm thick steel from strength point of view.
The fabricator does not have the capacity to bend 6mm thk plates.
Instead fabricator is proposing to use 2 nos. 3mm plates, bend them and use them on top of each other.
Spot welding will be used to ensure 2 nos. 3mm plates will act without slipping by each other, and thus shall have the strength of single 6mm thk plate.
How do I go about specifying the size and center to center distance of spot welds.
I have a good idea about calculation shear transfer in a I-beam, and know all about V.Q/I.t stuff, but Iam stumped when faced with a similar situation in case of plates.
Thanks
I need a 6mm thick steel from strength point of view.
The fabricator does not have the capacity to bend 6mm thk plates.
Instead fabricator is proposing to use 2 nos. 3mm plates, bend them and use them on top of each other.
Spot welding will be used to ensure 2 nos. 3mm plates will act without slipping by each other, and thus shall have the strength of single 6mm thk plate.
How do I go about specifying the size and center to center distance of spot welds.
I have a good idea about calculation shear transfer in a I-beam, and know all about V.Q/I.t stuff, but Iam stumped when faced with a similar situation in case of plates.
Thanks






RE: A question on spot-weld density on plates
For anything structural, it has to be raining in hell first before I would allow that.
RE: A question on spot-weld density on plates
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: A question on spot-weld density on plates
Your reaction is well justified.
The plates will be used for door frames. The doors are blast resistant and will resist 0.4 bar of overpressure , the design pressure being 0.4 x 4 = 1.6 bar = 16 tons/sqm.
The plates will be bent to produce a hollow box section.
To overcome the self-scepticism, I'm putting in a requirement, that the frame be filled with grout.The fabricator is willing to go along with grouting.
To keep things simple,I want to design the thing as hollow section, with grout being a extra measure of safety.
My judgement indicates that grout will add a lot of strength, but since it is not quantifiablle using standard calculations, I cant use it to my advantage in the design.
Hope that you have picture .
Thanks