| Dear Mr.Narendra Gohil, In the table QW-353 & QW-356 for base metal variable you have to look after QW 403.18 which states as follow, QW-403.18 A change from one P-Number to any otherP-Number or to a base metal not listed in table QW/QB- 422, except as permitted in QW-423, and in QW-420.2. Finally regarding the base metal qualification for welder you have to follow QW-423 as per SEC IX. Regards, P.B.R P.BalajiRajan, Inspection Engineer, Velosi Certification LLC, P.O 3408 Doha-Qatar. -------Original Message------- From: Narendra Gohil Date: 3/19/2011 12:17:19 PM Subject: Re: [MW:10429] Welder's qualification for diffrent steels and steel alloys. That means mainly we have to follow QW-353(SMAW) or QW 356(GTAW) for welder qualification.And that clearly mentioning P no as essential variable for the base metals. So here even if my welder is qualified with CS.I have to go for separate qualification for low alloy steel as P no. is changing. Kindly correct me if my understanding is not correct. Thanks & rgds Narendra Gohil Welding Engineer QAFCO Ph.+974-44228289(O) From: Sukamal Naskar <sukamalbecmet@gmail.com> To: materials-welding@googlegroups.com Cc: Narendra Gohil <ngohil@qafco.com.qa> Date: 19/03/2011 11:52 Subject: Re: [MW:10428] Welder's qualification for diffrent steels and steel alloys. Sent by: materials-welding@googlegroups.com Dear Mr. Gohil, Whenever you will qualify any welder, you have to consider all the essential variables QW353, QW356. The F-No will chage for SMAW , and for GTAW may be the F-No wil be same. If all the essential variables of QW 353 (SMAW) and QW 356 (GTAW) dosen't change , then you can qualify the welders accordingly. Kind Regards, Sukamal Naskar Senior Welding Engineer Bohler Welding On Sat, Mar 19, 2011 at 11:36 AM, Narendra Gohil <ngohil@qafco.com.qa> wrote: Dear Experts, As per ASME sec.IX- QW423.1 mentioning Base metals for welder qualification and also mentioning qualified production base metals against that. Like; P-or S-No.1through P -or S- No.11,P- or S-No. 34,and P- or S-No.41 through P- S-No.49 and against that same grouping and range of P- or S-No. mentioned for qualified production base metals. That means if a welder qualified with as for example in CS(P no-1) welding(GTAW or SMAW any one ) with preheating and PWHT welding parameters,he can qualified with Low alloy steel like (P.No.4 or other in low alloy steel). I have been questioned by our Inspection experts and I don't have answer other than mentioned in QW401.2"essential variable"(Performance). Thanks & Rgds. Narendra Gohil Welding Engineer QAFCO Ph.+974-44228289(O) -- 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. -- Sukamal -- -- 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. |
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...
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