How are the two pieces of sheet metal shown at the below url held together?
Question:How are the two pieces of sheet metal shown at the below url held together? There are just three "dents" holding them. Does this type of connection have a name? What is the name of the tool that makes it / how do I make it?
http://home-and-garden.webshots.com/albu...
Answers:
This is a older form used to hold metal together by stamping them together. This is not spot welding and there is not rivets involved, rather a punch is applied and pressed into the two metals creating the seal. Can not be done by hand.
Hope this helps.
It's called spot welding. It's commonly used to hold sheet metal together, like in automobiles.
It is called spot welding. The pieces are held in a clamp, while high current is passed through the pieces causing the metal to melt together. It is how cars are built.
The raised areas on those pictures do not look like spot welding...instead , they appear to be solid aluminum rivets.
The small indication of a dot in the center if the rivets means that they are a hardened alloy. In a few of the pictures there is a consistent countersunk depression indicating that the holes were dimpled prior to squeezing , or bucking the rivets. This process is used in the assembly of aircraft. The pictures do not indicate spot welding, because the quality of the pictures would not detail the small surface disruptions of spot welding.
Spot welding leaves Flash and Spalling, the burnt areas consistent with a weld, and these pictures do not have that.
And, spot welding does not raise the surface of the metal, it actually causes shrinkage after cooling. Aircraft Tool Supply and Brown Tool sell rivet squeezes and everything you need to make joints like that. Any questions feel free to email me.
Ok ok Here is a spot weld http://www.physics.ohio-state.edu/~herma...
And HERE is a rivet Joint http://www.our-rv7a.com/wings/wings04240... fifth picture down
http://brian76.mystarband.net/fuselageju...
Now? Does It still look like a spot weld?
*****NOTICE I SAID THAT THEY ARE SOLID RIVETS*****
SOLID RIVETS ARE NOT YOUR HARDWARE STORE TYPE RIVETS, AND THERE IS NO HOLE IN A SOLID RIVET, AS THE NAME IMPLIES, BUT THERE IS A DOT TO INDICATE THE GRADE OF RIVET.
SO YOU POSTED THE PICTURES?
TAKE SOME THAT ARE BETTER FOCUSED AND REPOST
I believe those " dents " are spot welds, done by a spot welder. which typically consists of two long finger like electrodes which clamp down together [finger tip, to finger tip] on two pieces of sheet metal then heated hot enough to weld them together.
That is not spot welding! Those are pop rivets. They are easy to install aluminum rivets that use a tool to expand them once they are installed. Check out this site.
http://www.emhart.com/products/pop/rivet...
They look like pop-rivets (the kind of rivet that can be attached without access to both sides of the rivet). You drill a hole, insert the pop rivet through and then squeeze the tool to pull and snap off the interior part.
it is done using an industrial pneumatic stamping press unless you are a millionaire. you cant afford it
to me they look like rivets , but not the cheesy kind we use at home in our pop rivet guns
Those ARE spot welds. They look raised but are infact not, just a different color from the weld. You cant simply dent metal and make them stick together, especiall in the applications shown. If anyone noticed, the "spots" in question are not at the corners or bends in the metal but where one piece of metal lies flat over another. They ARE spot welds.
I believe it's made with a dimpler.
The operation is similar to a hole punch but with different dies.
There are hundreds of variations of this tool with both hand held and large commercial types available.
THOSE LAST TWO PHOTOS LOOK LIKE THE METAL IS COPPER SHEET AND IF THEY ARE THEY ARE NOT SPOT WELDED TOGETHER. NEED BETTER FOCUS TO SEE THE METHOD BETTER.
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