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Cutting Drawn Over Mandrel Steel Tubing

Cutting Drawn Over Mandrel Steel Tubing

Cutting Drawn Over Mandrel Steel Tubing

(OP)
Hello All,

I am new here. I have read a number of helpful posts all of you have posted. Very informative! I really hope you can help me with my question here:

I want to purchase a drawn over mandrel welded steel tube with these dimensions:
3.25" OD
2.75 ID

My question is:
If I were to cut this tube in half down its length, how much spring-back should I expect?

Any help would be greatly appreciated.
-Bluethunder

RE: Cutting Drawn Over Mandrel Steel Tubing

No way to predict this. I would not expect the residual stresses to be evenly distributed, so how much the cut tube bows will depend on where you happen to cut it.

RE: Cutting Drawn Over Mandrel Steel Tubing

If you stress relieve or anneal the tube before cutting the deformation would be much reduced.

http://www.welding-advisers.com/

RE: Cutting Drawn Over Mandrel Steel Tubing

Just a thought.

Could you forge/cast the final shape that you are looking for. The issue of spring back then disappears.  

Kevin Hammond

Mechanical Design Engineer
Derbyshire, UK
 

RE: Cutting Drawn Over Mandrel Steel Tubing

(OP)
Everyone,
Thanks for your responses.

Prohammy,
I need to get this material as soon as possible for my project since it is readily available. As a result, casting, unfortunately, is not an option.

Goahead,
I think I may be able to ask the supplier to stress relieve the material for me. Thanks!

-Bluethunder

RE: Cutting Drawn Over Mandrel Steel Tubing

Keep in mind that the tubing won't be straight when you get it back from stress relief and it may also have a scaled up surface instead of the nice smooth finish you started with.

RE: Cutting Drawn Over Mandrel Steel Tubing

With all these problems previously posted . . .

Can you weld the "whole" pipe in place first and then cut it in half as desired.

RE: Cutting Drawn Over Mandrel Steel Tubing

Bluethunder2007, anyway you can get this formed out of plate?

Press brake or something? How many pieces?

Regards,

Mike

RE: Cutting Drawn Over Mandrel Steel Tubing

(OP)
Gents,
Press brake ideas are very good! However, it would be less expensive for my department to buy the tube and slice it lengthwise in half....... the suppliers I contact did not have any data as far as how much the tube would open due to residual hoop stresses. I think, from gut feel, that it will not be much where it would affect my intended application negatively.
-BT

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