Welding with ER-309 on P-1 to P8

[HoudiniMD]

I have a client that requires a Max 22 RC hardness for a particular service. Welding deposit with ER-309 per approved WPS and PQR will produce a much harder than 22 RC hardness. Is there a way to achieve this on a disimaliar weld like this?

 

[metengr]

First off, the hardness max limit is on what - the filler metal, base metal, base metal heat affected zone???? Second, I would use Inconel filler metal, in lieu of 309, if you intend to have service temperatures at or above 800 deg F. Third, what specific grade of materials are you joining?

 

[HoudiniMD]

It is 22 RC on weld deposit not base metal
Carbon Steel to 316L SS
Would Inconel get you below 22RC?

 

[SJones]

If you use a nickel alloy filler, then there will not be any hardness restriction on the weld metal itself. The issue could be at the fusion line if the hardness indent samples that location. If your client is following ISO 15156 or NACE MR0103 they should be asking for hardness in Vickers units.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[pradipgoswami]

Hi HoudiniMD,

If the hardness restriction(22HRC) is only for welds, E/ER-309 also may get you there.Advisable would be :-
- to use 309L, carbon restriction to to the max limit specified in SFA 5.9/5.4
-ask for hardness test results on the all weld deposit of E/ER-309L, preferably should be at least 30-40 points below (rule of thumb) required 22 HRC criteria
-if it's a groove weld control the welding parameters for the root/first pass to control dilution.

Thanks.


Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario, Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

 

[wegm]

For CS to SS welding you can have a look here:

http://www.weldinguide.com/gdanastasiadis/viewtopic.php?f=5&t=32