www.NCTfrictionwelding.com Friction Welding of Solid part to tube.
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Uploader Comments (NCTFrictionWelding)
All Comments (16)
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excellent
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Bruce Lee can friction weld his hands together.
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Chuck Norris can friction weld two pieces of pipe together with his bare hands.
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that was awsome...
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big boy toys
nice
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EXcellent...
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AWESOME !!!
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The surface finish of the pre-weld interface has little effect on the weld as arguably most or all of the interface material is extruded in the form of flash during second friction or in forge collapse in third friction. The surface finish will affect the ramp up of weld interface temperature during first friction but only for maybe less than the first half second. Contaminates like oxidisation, lubricants and surface coatings would have more of an effect than surface finish.
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The higher axial thrust force (pressure) applied during the second friction phase of the weld technically cools the weld interface in comparison to first friction phase. The higher the axial thrust force and the lower the peripheral speed of rotation (angular velocity) the higher the torque and therefore thelower the temperature. But yes their stuck together alright!
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Additionally, yes inferior welds can be replicated on a manual lathe and have been used for this with limited success frequently in the old days, this would be more a controlled seizure than a friction weld; however for the reason stated above, only small components like drills could be joined. The use of a CNC lathe would be dangerous, there is no feedback of force applied to the spindle and would almost certainly result in catastrophic machine frailer as my friend at NCT has pointed out.
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Pressure depends on a welded area. For smaller parts we use 6 to 20 ton machines. Bigger stuff - up to 150 ton. So if someone willing to junk his CNC lathe, good luck. It could be costly test!!! :(
NCTFrictionWelding 3 years ago
The disk (solid part) is rotating in the chuck and the tube is stationary in the clamp. This way you can get friction between two parts. Second stage is higher pressure witch creates more friction/temperature! After that is final stage - third pressure when two parts penetrate each other. That is all! You have joined these two part together!
NCTFrictionWelding 3 years ago