Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed piece
was allowed to spin before stopping the motor there would have been less of
a jolt.


--

Reply in group, but if emailing add one more
zero, and remove the last word.

Tom Del Rosso wrote:


Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed piece
was allowed to spin before stopping the motor there would have been less
of a jolt.


Friction stir welding is a well-accepted process used to make axles and
driveshafts on auto parts. It may be a bit rough on standard lathes, but
the machines built for the purpose take it day in and day out.

Jon

In article ,
"Tom Del Rosso" wrote:

Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed piece
was allowed to spin before stopping the motor there would have been less of
a jolt.

I thing the friction welder stopped as it was programmed to stop, not
that it was stalled by the workpiece. That machine is not a lathe,
despite the chuck. It appears to be a direct drive friction welder.

Joe Gwinn

Joseph Gwinn fired this volley in news:joegwinn-
:

I thing the friction welder stopped as it was programmed to stop, not
that it was stalled by the workpiece. That machine is not a lathe,
despite the chuck. It appears to be a direct drive friction welder.



Who _didn't_ hear the contactor cut out when the weld was finished?

That was not a stall; no, not at all.

LLoyd

On 8/14/2011 4:28 PM, Jon Elson wrote:
Tom Del Rosso wrote:


Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed piece
was allowed to spin before stopping the motor there would have been less
of a jolt.


Friction stir welding is a well-accepted process used to make axles and
driveshafts on auto parts. It may be a bit rough on standard lathes, but
the machines built for the purpose take it day in and day out.

Jon

Friction stir welding is a different process. It uses a tool akin to a
router to force a smooth bit along a flat butt joint between two
aluminum sheets effectively stirring the two sheets together. Used in
aerospace and similar work.

On 8/14/2011 1:38 PM, Tom Del Rosso wrote:
Is this an acceptable process?

Yes, a company I worked for had a friction welding division and that's
how they did it.

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed piece
was allowed to spin before stopping the motor there would have been less of
a jolt.

The machine is not a lathe. The headstock is similar, the tail stock
pushes one half of the piece under enormous pressure against the other
half. The weld slag at the junction can be a bitch to remove.

David

"David R. Birch" fired this volley in
:

The weld slag at the junction can be a bitch to remove.



"Slag" is a product of fluxes. Did they flux the joints?

LLoyd

On 8/14/2011 1:38 PM, Tom Del Rosso wrote:
Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed piece
was allowed to spin before stopping the motor there would have been less of
a jolt.



As somebody else said, it's not a lathe. It's supposed to do that.

Another common use of this method is welding the exhaust turbines onto
turbocharger shafts. I looked a bit for some good videos of that but
didn't see any. The newer machines are a lot more protected, you can't
see much happening.... ten years ago, the older ones were quite a bit
more 'open" and lathe-like.

------

Can you do friction-welding on a regular lathe? Even of just two very
tiny parts? This would be more of a "stupid shop trick" more than
anything useful, but I do wonder.....

On 8/14/2011 6:19 PM, Lloyd E. Sponenburgh wrote:
"David R. fired this volley in
:

The weld slag at the junction can be a bitch to remove.



"Slag" is a product of fluxes. Did they flux the joints?

That is a very limited definition of slag. AFAIK, no flux used.

David

"David R. Birch" fired this volley in
:

That is a very limited definition of slag. AFAIK, no flux used.

Noooo.... The stuff that flakes on the surface from over-heating is
"scale", not "slag". Slag is non-metal stuff -- from flux.

LLoyd

On Sun, 14 Aug 2011 19:08:02 -0500, DougC
wrote:

On 8/14/2011 1:38 PM, Tom Del Rosso wrote:
Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed piece
was allowed to spin before stopping the motor there would have been less of
a jolt.



As somebody else said, it's not a lathe. It's supposed to do that.

Another common use of this method is welding the exhaust turbines onto
turbocharger shafts. I looked a bit for some good videos of that but
didn't see any. The newer machines are a lot more protected, you can't
see much happening.... ten years ago, the older ones were quite a bit
more 'open" and lathe-like.

------

Can you do friction-welding on a regular lathe? Even of just two very
tiny parts? This would be more of a "stupid shop trick" more than
anything useful, but I do wonder.....

I did friction welding on my 10EE. It was a part to hold roll of PLU
stickers. Or that little sticker you see on every apple.

I tried a butt weld. That didn't work. Then I put a slight taper on
both the disk and arbor. This welded in a second. two very small parts
that would have been damn near impossible to TIG weld perfectly
square.

Karl

On Sun, 14 Aug 2011 14:38:56 -0400, Tom Del Rosso wrote:

Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed
piece was allowed to spin before stopping the motor there would have
been less of a jolt.

I think it looked reasonable giving the violence of the process.

I remember reading about friction welding in my metal shop textbook in
the late '70's. That book claimed that it was done by spinning up one
part and letting the momentum of the spinning part make the weld -- I
take it that now it's done by humongous motors.

--
www.wescottdesign.com

On 8/14/2011 7:41 PM, Lloyd E. Sponenburgh wrote:
"David R. fired this volley in
:

That is a very limited definition of slag. AFAIK, no flux used.

Noooo.... The stuff that flakes on the surface from over-heating is
"scale", not "slag". Slag is non-metal stuff -- from flux.

LLoyd

You can argue with my dictionary, which gives the first definition of
slag as "the dross or scoria of a metal".

David

On 15/08/2011 9:42 AM, Tim Wescott wrote:
On Sun, 14 Aug 2011 14:38:56 -0400, Tom Del Rosso wrote:

Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed
piece was allowed to spin before stopping the motor there would have
been less of a jolt.

I think it looked reasonable giving the violence of the process.

I remember reading about friction welding in my metal shop textbook in
the late '70's. That book claimed that it was done by spinning up one
part and letting the momentum of the spinning part make the weld -- I
take it that now it's done by humongous motors.



I saw a 70's training video where the bearing cups for bicycle hubs were
being welded onto the central tube. Took much less than a second per
unit. Very neat.

Stuart Wheaton wrote:

On 8/14/2011 4:28 PM, Jon Elson wrote:
Tom Del Rosso wrote:


Is this an acceptable process?

http://www.ebaumsworld.com/video/watch/81732304/?lt=ep

I think not, with the way it stopped the lathe. Maybe if the fixed piece
was allowed to spin before stopping the motor there would have been less
of a jolt.


Friction stir welding is a well-accepted process used to make axles and
driveshafts on auto parts. It may be a bit rough on standard lathes, but
the machines built for the purpose take it day in and day out.

Jon

Friction stir welding is a different process. It uses a tool akin to a
router to force a smooth bit along a flat butt joint between two
aluminum sheets effectively stirring the two sheets together. Used in
aerospace and similar work.

Here is an example of stir welding performed on pipe.
http://www.youtube.com/watch?v=niVsJPFlg1Y

Wes

"David R. Birch" fired this volley in news:j29vda01oj2
@news6.newsguy.com:

You can argue with my dictionary, which gives the first definition of
slag as "the dross or scoria of a metal".

Such dross shows up in the smelt. Finished metallurgical alloys scale
slightly when heated to welding temperatures. Slag does not form except in
the situation where lots of impurities are present -- such as a welding
flux.

This is a metal-working sig. Common use in a field often does not match
what Webster's might say is common use among the populace.

LLoyd