Re: [MW:7538] Expanding Alloy 20 Tubes

Generaly such alloy tubes require higher force for expansion and to avoid excessive work hardening the expansion is to be carried in 2 to 3 steps. With proper lubrication. :however. Generaly welding is carried before expansion as there is chances of porosity in weld if it is carried after expansion
Regards
Hegde

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From: "John Hardcastle" <jhardcastle@euromechanical.com>

Sender: materials-welding@googlegroups.com

Date: Wed, 13 Oct 2010 14:01:56 +0400

To: <materials-welding@googlegroups.com>

ReplyTo: materials-welding@googlegroups.com

Subject: [MW:7532] Expanding Alloy 20 Tubes

We are going to use Alloy 20 tubes in a heat exchanger,we will expand approx 200 mm length into grooves and then seal weld.
We have been told expansion is difficult, has anyone had any experience of this procedure.

John Hardcastle

Fabrication Manager

Euro Mechanical Contractors Company Factory

P.O. Box 46153 Abu Dhabi United Arab Emirates

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