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7 comments
Anonymous Poster

welding of SS304 & SS316

04/05/2008 5:19 AM

I want to know that is there any difficulty in welding SS304 material with S316. Do we require any special welding material.

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Guru

Join Date: Sep 2007
Posts: 1821
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#1

Re: welding of SS304 & SS316

04/05/2008 9:18 AM

I believe most welders will recommend a TIG welder but I think if you only have one or a few welds to make a MIG will do as well. If this is for production work you should invest in the best suitable equipment which would be a TIG.

This link shows you the different SS properties so you can choose what would be best for you to use.

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Guru

Join Date: Jul 2006
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#2

Re: welding of SS304 & SS316

04/05/2008 2:26 PM

Case491 has answered your query regarding the welding.

The suitability of these two grades in your conditions is worthy of consideration, as the chemical resistance of 316 is better than that of 304 for some chemicals.

Just a comment to keep in mind. If this weld remains wet, could have galvanic issues.

don't forget to passivate.

milo

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Power-User
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Join Date: Sep 2006
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#3

Re: welding of SS304 & SS316

04/06/2008 10:09 AM

I believe the poster is asking a material question not a process question.

Do we need any special welding material, Yes

Type 304 stainless steels may be welded with type 308L-16. The weld deposit is limited to 0.04% carbon, to minimizes chromium carbides in the weld and prevent to intergranular corrosion.

BRANSON

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Guru

Join Date: Jul 2006
Location: "Dancing over the abyss."
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#4
In reply to #3

Re: welding of SS304 & SS316

04/06/2008 9:54 PM

Agreed.

However failure to anticipate normal consequences could leave one in a bind,

Here is an example:

http://cr4.globalspec.com/thread/19817?frmtrk=cr4sd#newcomments

I have made it a point to protect the customer from himself as often as from my organization throughout my career, and that was the motive between my post.

Thanks for posting.

milo

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People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
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Power-User

Join Date: May 2007
Posts: 272
Good Answers: 5
#5

Re: welding of SS304 & SS316

04/07/2008 4:04 AM

it's a normal welding between two autenitic SS. Use a filler metal 308 / 316 and the usual recomendation regarding preheat / interpass temperature

http://www.euro-inox.org/pdf/map/BrochureWeldability_EN.pdf

S.

Corrosion Control | Corrosion Prevention

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Anonymous Poster
#6

Re: welding of SS304 & SS316

04/07/2008 9:06 AM

Weld 304 with 308 electrode and 316 with 316 electrode. We use to think by welding 304 with 316 we were "upgrading" the weld but in reality it is a different alloy that may introduce unfavorable elements to the piece. I have personally found that 316 is less forgiving with vibration and more prone to crack. Also 316 is around 30% higher to buy so why would you want to use it?

pipewelder

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Guru

Join Date: Oct 2007
Location: Tulare, CA
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#7

Re: welding of SS304 & SS316

04/07/2008 10:45 AM

We are often required to weld a piece of pump shaft which is 316 grade SS to SS sheet metal which is 304 grade. We don't change anything with our mig welders when working with one or the other.

I'm not disagreeing with anyone that has posted before me. There are applications where you might have to use a different welding procedure to maintain the 316's properties, but if it is just to weld two pieces that are required to be just stainless steel then the normal procedure works fine.

We have to use pump shaft for the use of bearings and is not exposed to the elements on the other side. If it came in 304 we would be using that instead.

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