Dissimilar Metal Weld

Yes is posible, you need a WPS/PQR:

For any non-welders (or wannabee welders, like me) trying to follow along:

WPS: Welding Procedure Specification

PQR: Procedure Qualification Record

I'm guessing that the chart in the previous post lists various types of metal across the top and down the side, and you find the needed procedure (or a reference to it) at the intersection of the row and column for the two metals?

The chart lists the preferred filler metal for joining different grades of carbon steels to stainless steels.

I blew it up, but it isn't suitable for publication.

Generally, using equivalent or higher grade stainless steel as filler material is recommended.

Milo will know, and I'm sure there are guides on the web.

Yes, Thanks for the explanation.

Hello, Can you send me this table to my email? Its very interesing. Best regards Jose

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There are process requirements and the desigener's economic design considerartions lead to involve dissimilar metal joints in plant piping. These are well accepted joints and well quilified procedures to develop welding procedure specifications. But history has revealed that poorly finished dissimilar metal joint are pron to fail and needs timely inspections.

In pressure vessels, cladding is normally done on the base and then final weld by the similar metal joint is performed. Care should be taken to keep carbon content balance in weld, HAz and parent metal. Carbon shift in this type of joint can lead to failure of joint in short duration.

As mentioned by Whitephone, Post #1, yes welding of dissimilar metals is possible, taking into consideration that all WPS(s) and PQR(s) must be carried out under the supervision of AI (Authorized Inspector).
This sample chapter is for review purposes only : Welding_of_Dissimilar_Metals, Copyright © The Goodheart-Willcox Co., Inc. All rights reserved.

Interesting topic. I am sorry that I could not open your reccommended article.

How can I get a copy?

Regards;

Nadeem

To download the file:

1. Click (may be double click) the file Welding_of_Dissimilar_Metals, the attached page will be opened:

2. Click the blue rectangle at the bottom of page "Download Now", and wait until download link appear.

3. Click the "Download File Now".

May be I can't open the links from the office computer so I will try to open from home.

Thanks for the help.

Regards;

Nadeem

advantages of dissimilar weld:

1.we can connect two diff materials of diff strength..so we can minimise the cost.

disadvantages:

the weld is not of uniform strength.

the joint formed with ununiform microstructure..

can u put some more information regarding SA516-70 with SA240-304? like thickness,grade...

Welding of stainless (304 example given) to carbon steel is often done with 309, a higher Cr deposit, to avoid the Cr depletion in the grains by carbide formation at the boundaries. The resulting deposit is harder than a whore's heart, so put it where you want it! 322 and 347 have also been used but are pricier than 309.

drbob,

Is that a medical term for a cardiac condition, or is it a welders term for really really hard?

the latter. I ruined a couple of grinding discs on one deposit I had planned to grind smooth. I suspect the Cr carbides at the grain boundaries, which still form with high Cr filler metal, but don't over deplete the grains themselves.