Skip to main content

Re: [MW:36034] SS304/304L Tubes to CS Tubesheet Mock Weld -Cracks found

By Materials & Welding
Dear Sirs, 

As per my below mail history and your recommendation for low Amps to avoid high heat input, 
After performing the new MOCKUPs for 15.85, & 19.05 OD SS304L tubes to CS SA-516-70N tubesheet of 50mm with GTAW ER309LMO 1.6 Dia only of 3 passes for 19.05 ID tube, 82 A for 1st pass, 95A for 2nd, 100A for 3rd pass. Only 2 passes given for 15.85 OD tube.

We got incomplete penetration aa per the attached macro photo., almost for all the tube welds for both sized tube welds.

Please see the groove design for your reference. 

Also, please give me suggestions to make sound complete penetration on root pass and to avoid cracks too.

Thanks and regards, 
Saravanan Sornam, 
Ansan city,
S.Korea 




On Thu, 16 Apr 2026, 2:51 pm 'Ahmed Osman' via Materials & Welding, <materials-welding@googlegroups.com> wrote:
sure, 309LMO will be helpful as low carbon and MO are increasing delta ferrite for avoiding hot cracks
also reduce heat input for controlling dilution from CS sheet

Best Regards ,
Ahmed Osman



On Thursday, April 16, 2026 at 08:32:05 a.m. GMT+3, PARAI Reaction Channel <saravanshyla@gmail.com> wrote:


Dear Sir, 

Thank you for your advice for root welding parameters. 

Can i use ER309LMO  instead of ER309 ?

Please confirm. 

Thanks and regards, 
Saravanan Sornam, 
ANSAN,
S.KOREA 


On Thu, 16 Apr 2026, 12:06 pm Vanchinath S.A., <vanchinaths@gmail.com> wrote:
Weld root with 80-90 amps. 
Vanchi

On Wed, 15 Apr, 2026, 7:18 pm PARAI Reaction Channel, <saravanshyla@gmail.com> wrote:
Dear Sirs,

We have made 2 MockUp PQRs as per ASME Sec IX QW-193.

The Tube sizes are 19.05OD x2.11T and 15.88OD x2.11T, the
tubesheet plate is SA-516-70, 50T.

Amps used Max 145, Volts Max 13, welded with GTAW AWS Class ER309 with 1.6mm Filler , 2 passes.

We found minor cracks on the weld root and some on the surface too, but not for all the 10 tubes welded, but randomly found these cracks

When we did PT after welding on the surface, no cracks were found. But found after Macro etching at the test lab.

Can I switch the filler to ER309LMo for this MockUp weld ?

Are these cracks called Hot cracks ?

Please give me some advice.

With best regards,
Saravanan Sornam,
Ansan city,
S.Korea.


--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/materials-welding/CALV1rkLag0%3D-RPjKQhRB21ODF3eNenk1Ey71-xTpp5LFMvTj5w%40mail.gmail.com.

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/materials-welding/CA%2B6Tn1J899TZG5aTAuFfY%2BYO0qvyaeZkg5QM1wr729uL7qs1uA%40mail.gmail.com.

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/materials-welding/CALV1rk%2BcwAX%2B6U1xh5BDXqzjPxqr4VuyKPtt%2B446Gw%3D3XZQfFQ%40mail.gmail.com.

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/materials-welding/773838541.625509.1776325907560%40mail.yahoo.com.

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/materials-welding/CALV1rkL9w1t5isscenUwqs5MqkvfsS0oFBqqaN9%3DwFOxh8m5_w%40mail.gmail.com.
Uploaded Image Uploaded Image

Comments

Post a Comment

Popular posts from this blog

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

The Schaeffler and Delong diagrams for predicting ferrite levels in austenitic stainless steel welds

By Materials & Welding
Introduction Ferrite is important in avoiding hot cracking in during cooling from welding of austenitic stainless steels. 'Constitution diagrams' are used to predict ferrite levels from the composition by comparing the effects of austenite and ferrite stabilising elements. The Schaeffler and Delong diagrams are the original methods of predicting the phase balances in austenitic stainless steel welds. Nickel and chromium equivalents A 'nickel equivalent' is calculated for the austenite stabilising elements and a 'chromium equivalent' ferrite stabilising elements. These are used as the axes for the diagrams, which show the compositional equivalent areas where the phases austenite, ferrite, martensite (and mixtures of these) should be present. Although intended to show the phase balance of weld fillers, these diagrams can also be used to illustrate the phase balance of the 'parent' material. There are different diagrams for dif...
Post a Comment
Read more