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7th February 2014, 10:43 PM #1Senior Member
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Can these 2mm thick pieces be wielded without adding to their thickness?
Here is what I want to weld up to keep a piece of plywood from warping. Could the join be welded & grinded back mostly so it doesnt add anymore to the thickness?
image.jpg
Was wondering if the draper expert 130A 230V gasless MIG would do this?
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7th February 2014, 11:05 PM #2.
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Thickness will be the last of your worries - stopping it from twisting into a pretzel will be more of a problem.
What's it for?
You might find it easier to have it plasma cut out of some 2 mm plate.
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7th February 2014, 11:32 PM #3Senior Member
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8th February 2014, 12:05 AM #4.
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8th February 2014, 10:57 AM #5GOLD MEMBER
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Short answer,yes it could be welded up as you desire and ground back and kept flat and true. If you were going to get it cut from a sheet, then laser cutting would be your best option, I would not guarantee plasma cutting would provide an unwarped component. This would be costly for a one off component.
However unless I am mistaken in your intent I doubt it will achieve much at all as far as strengthening your plywood. As BobL said, some more information would be good.
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10th February 2014, 03:39 PM #6Senior Member
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Like the others have said - no problem welding and grinding flat but no use straightening I'd imagine. I use flat bar sometimes for various things and carrying a long length of flat bar around is a PITA primarily because it just flops like limp spaghetti. A better idea would be angle or RHS/SHS. The smallest you could get would be 20mm SHS. How thick is the ply? Can you route a rebate into it and recess a thicker metal frame into that? Or can you laminate another product to the ply, like a sheet of glass each side or carbon fibre would stiffen it considerably with very little thickness added.
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10th February 2014, 05:46 PM #7SENIOR MEMBER
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I, too, assumed that the flat bar would do nothing for warping, but provided the bar is solidly glued to the ply (i.e. laminated), the bar will resist the contraction and expansion caused by the ply trying to go convex or concave, so it may actually work.
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10th February 2014, 06:15 PM #8
I doubt whether it would have any stiffening effect given that 2mm FMS is easily bent by hand. I can't see how it would resist any warping by plywood.
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10th February 2014, 07:28 PM #9SENIOR MEMBER
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