Re: [MW:30456] IWE Question

The solubility of Sulphur and phosphorous is higger in delta ferrite which prevents hot crack. So 312 should be idle choice. 

On Mon, Feb 3, 2020, 11:19 AM Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:

Yes 312 is better because it has got more ferrite

On Mon, 3 Feb 2020 11:55 am , <jobythomas2005@gmail.com> wrote:

As part of a fabrication process, type AISI 303 stainless steel threaded fittings have to be joined to a type

AISI 304 stainless steel head using fillet welds. Both SMAW and GTAW have been tried with 308L, 316L and

309L filler metals, but the welds frequently crack and leak. The chemical compositions of the alloys are given

the table below.

 

Q1.1. Briefly describe the possible cause of failure of the welded joints. Motivate your answer by referring to

the relevant failure mechanism.

Q1.2. Will type 312 filler metal be a better choice in this application? Refer to any problems that may be

experienced when this filler metal is used.

 

Alloy	Cr	Ni	C	Mn	Si	Other
AISI 303	18.5	9	.05	1.75	.5	MIN 0.15 S
AISI 304	18.5	8.5	.05	1.75	.5	-
E308L	19.8	9.8	0.025	.75	.95	-
E309L	23.0	12.5	.025	.8	1.00	-
E316L	19	11	.025	1.5	.35	2.7Mo
E312	22.2	8.8	0.11	0.05	1.00	0.1Mo

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