Skip to main content

Re: [MW:13175] HEAT INPUT DURING PQR

By Materials & Welding
Dear Ravi,

Heat input usually is measured as Joules per
linear inch, J/in. (kJ/cm). However, in this specification
the heat input is governed in the preparation of the test
assembly by the bead sequence and the total weld layer
count upon completion of the groove weld test assembly.
Heat input will have a significant effect on the strength
levels attained in many of the higher strength weld metals
produced from the electrode classifications in this specification.
For instance, weld metal produced with
E11018M electrode at a 35 000 J/in. (13.8 kJ/ cm) heat
input rate may exceed 110 ksi (760 MPa) yield strength
142
in the as-welded condition and 95 ksi (655 MPa) yield
strength after postweld heat treatment. On the other hand,
if the heat input is raised to 55 000 J/in. (21.7 kJ/cm),
this same electrode will produce weld metal that does
not exceed 110 ksi (760 MPa) as-welded yield strength
and after postweld heat treatment may be below 95 ksi
(655 MPa) yield strength. It is, therefore, recommended
that, if the user is going to use either lower or higher
heat inputs than normally used for classification testing
of electrodes, the user should test the welding procedure
to be used to determine that the strength levels expected
will be attained in production. This is especially true if
out-of-position welding is to be performed.

-- 
Thanks & Regards
Antony Jenis
Offshore Sr.Surveyor (Commissioning) / Representative,
GERMINSCHER Lloyd-NOBLE DENTON
IRAQ CRUDE OIL EXPANSION PROJECT,IRAQ OFFSHORE,
LIGHTEN BARGE MYNX,
UAE Mobile No: 00971505624002     



On Thu, Dec 8, 2011 at 9:59 PM, ravi varman <ravimvarman@gmail.com> wrote:
DEAR EXPERTS,
 
          WHEN WE PREPARE THE PQR WE GET THE HEAT INPUT TO THE MATERIAL FROM CALCULATIONS.
 
 
COULD ANYBODY TELL ME THE MAXIMAM HEAT INPUT FOR CS ,LTCS ,SS,SDSS & ALLOY STEEL.
 
 
 
            RAVIVARMAN.M
          QA/QC ENGINEER
LAHOUD ENGINEERING CO.LTD
 
        

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.



 

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

Comments

Post a Comment

Popular posts from this blog

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

By Materials & Welding
Hi,  You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this.  Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime.  Again, these simulated no. Of cycles shall be specified in MTC.  The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case).  One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example.  In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
Post a Comment
Read more

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