Thank you very much for uploading this video. It was very informative and helpful to understand the requirement of PWHT. Can you also post a video in which can be shown, the effects of PWHT on the microstructure of the base and weld metal, especially the effect of PWHT on the Residual Stress? This would help in visualization of the process and its effects.
Very informative. I washed all your videos and like your approach about welding. Very clear, precise and concise. Thank you. Could you go over the welding processes? I am taking CWI in 2months and will greatly appreciate it. Keep up the good work.
Hi, Good video. And nice explanation Will post weld heat treatment be required for a node where D/t ratio is less than 20 ..( dia is 1900 and thickness is 100mm). The beams joining at the node have flanges 100 thk and webs 80thk.
We make CA6NM castings and while performing NDT test on finish machined casting if some minor defects are found of the size 5mm x 3mm x 2mm , we generally grind them out and weld them using same metal's electrode, basically we do a temper bead welding. I need to know if PWHT is required in that case or not ? Answer is no but i need some evidences , i have read asme code 9 , but unable to find the prrof. can you help ?
Hello , If I understand your question correct then you want to know the general rule if you want to post heat low carbon steel (p1) example: if you refer iron carbon diagram: for 0.8% of carbon. you have to heat it to 728 C to austenic range. thenslowy cool that to disolve the carbon
Which ASME Section 3 are you referring? ASME BPVC section 3? Then this is rules for construction of nuclear facility. Hope this should be wrt ASME BPVC Section 8 Please clarify
Hello Buddy HAZ is nothing but the heat affected zone based on the heat transfer from the hot weld metal to less hot base metal. because of the conduction heat transfer between the different lyres of the metal , grain structure changes so answering your question in brief: it is the part of the base metal only. and it changes based on the heat input and also based on the thickness of the base metal. it is not part of any code simply: more heat you put: more heat affected zone and less heat you put less heat affected zone. for the welding of an alloy steel: sometimes we do not give enough time to cool down for the heat affected zone and because of that hardness changes of that area. that is why HAZ for alloy steel is important in terms of proper cooling down.. let me know if you have more questions
it depends on the code and type of metal. for example for low carbon steel anything more than 1.5" requires pre heat if you have any specific case: I can explain based on that
well, for critically post weld heat treated parts not possible because cooling shall be slow and uniform. and it will be tough to hold certain temp with the torch
Hello Hasan Azam, DPT shall be done after PWHT once the metal reach to the ambient temperature. some metals like A514 shows delay cracking, in this case code specifies which metals/welding shall be tested after 24 to 48 hours.
@@weldinginspection7239 what will happen to 25 mm plate, if 25 mm thick plate and 60 mm thick plate soaked (pwht) simultaneously in furnace according to 60mm plate requirement
@@Ajin0077 good questions : heat transfer works based on the conduction heat transfer phenomenon , so it does not over heat or over soaked: hear transfer happens uniformly per cross section of both plates. so you can say more length will be heated for 25 mm plates vs 60 mm plate. if you review iron carbon phase diagram: there is a large temperature range for the heating condition which will cover both metal thickness under same phase. also , design/welding engineer do consider this fact and provide heating requirement according to the thickness.
![[Hindi/Urdu] PWHT - Post Weld Heat Treatment](/img/1.gif)
superb explanation I did not ever see like this on PWHT. Thank you sir
Your English is really 👍 very informative
sarcasm :)
Thank you, thank you, and thank you. Simple explanation, yet so important.
thank you sir
Good knowledge sharing.thanks.
thank you
Thanks for the insight. I'm new here. I like to know how to set the parameters for the heating process. We use Suntec heating machine where I work
Thank you ! 👍
Thank you very much for uploading this video. It was very informative and helpful to understand the requirement of PWHT. Can you also post a video in which can be shown, the effects of PWHT on the microstructure of the base and weld metal, especially the effect of PWHT on the Residual Stress? This would help in visualization of the process and its effects.
Excellent job brother
GOOD INFO -- THANKYOU
Very informative. I washed all your videos and like your approach about welding. Very clear, precise and concise. Thank you.
Could you go over the welding processes? I am taking CWI in 2months and will greatly appreciate it. Keep up the good work.
Thank you, let me know if you need more help. I did my CWI 5 years before. I can help you with more if you need
Please subscribe
@@weldinginspection7239 I would appreciate it. Could you go overt the different types of PWHT charts and interpretations? Thank you
@@fatouchou5460 sure, do you have any specific code need ?
Very useful
Hi,
Good video. And nice explanation
Will post weld heat treatment be required for a node where D/t ratio is less than 20 ..( dia is 1900 and thickness is 100mm). The beams joining at the node have flanges 100 thk and webs 80thk.
Thanks
Very niceely explained.
Hai sir please explain about the codes used for pressure vessel
If 30 thk, pipe welding with 2” weldolet, does this joint required Pwht,
Thanks
Very informative ,thank you👍
Thank you Miguel
thanks sir
Pls make more videos in qc Field
sure, any specific suggestion please?
We make CA6NM castings and while performing NDT test on finish machined casting if some minor defects are found of the size 5mm x 3mm x 2mm , we generally grind them out and weld them using same metal's electrode, basically we do a temper bead welding. I need to know if PWHT is required in that case or not ? Answer is no but i need some evidences , i have read asme code 9 , but unable to find the prrof. can you help ?
thank for the video
What is the formula for soak temperature
Thanks for the information. Why is there a requirement of PWHT in A516 Gr70
they are high strength steel , dissolving carbon uniformly is most important to retain the strength of the material
@@weldinginspection7239 Apologies for the delayed response, thanks a lot sir!!
Sir will pls make a video in NDT of welding
yes, what specific area/topic do you suggest ?
What will be the holding temperature if it is not possible to maintain code temperature for carbon steel P NO 1
Hello , If I understand your question correct then you want to know the general rule if you want to post heat low carbon steel (p1)
example: if you refer iron carbon diagram: for 0.8% of carbon. you have to heat it to 728 C to austenic range. thenslowy cool that to disolve the carbon
bro can you explain itp review key points...how to review piping and structure itp pls explain to me
Thank you sir
thank you for the feedback
Which ASME Section 3 are you referring?
ASME BPVC section 3? Then this is rules for construction of nuclear facility.
Hope this should be wrt ASME BPVC Section 8
Please clarify
Is the haz considered part of the base metal or is there a code specific area which is 'part' of the base metal but measured from a certain point
Hello Buddy
HAZ is nothing but the heat affected zone based on the heat transfer from the hot weld metal to less hot base metal.
because of the conduction heat transfer between the different lyres of the metal , grain structure changes
so answering your question in brief: it is the part of the base metal only. and it changes based on the heat input and also based on the thickness of the base metal.
it is not part of any code
simply: more heat you put: more heat affected zone and less heat you put less heat affected zone.
for the welding of an alloy steel: sometimes we do not give enough time to cool down for the heat affected zone and because of that hardness changes of that area. that is why HAZ for alloy steel is important in terms of proper cooling down..
let me know if you have more questions
What is min. In piping, Pwht required
hardness 3 region haz deposited and parent metal
Why it's pwht required for alloy steel???
Pls say about it sir
Hello Sir , briefly, allow is the mixture of various metals. to melt and fuse them properly, we need to do PWHT
Very informative video. Thanks a lot. I will give cwi in 2 month.
You can help me. Because u did this exam
Thank you
you are welcome
Sir, minimum how much thickness does it require for preheat or pwht?
it depends on the code and type of metal.
for example for low carbon steel anything more than 1.5" requires pre heat
if you have any specific case: I can explain based on that
Pwht different soaking temperatures for different materials? How can we know that pwht is successful or not
By hardness test
Sir, one question, for pwht, can heat gradually by oxy heating torch is OK, or must need oven?
well, for critically post weld heat treated parts not possible because cooling shall be slow and uniform. and it will be tough to hold certain temp with the torch
Thanks sir
I have a question for you for the p number 1 asme b31.3 what is the requerments for pwht
www.eng-tips.com/viewthread.cfm?qid=377727
this will help Sir
Can you explain IBR rules regarding PWHT
sure, i will make a video
Can dpt be done after pwht? And if there comes delayed stresses or cracks then welding is going to be done again? And again we have to do pwht?
Hello Hasan Azam, DPT shall be done after PWHT once the metal reach to the ambient temperature. some metals like A514 shows delay cracking, in this case code specifies which metals/welding shall be tested after 24 to 48 hours.
Does anyone knows how to calculate # of cycles for simultated PWHT? That’s for a H2S wet service, SA516-70N 1 3/4” thk.
How it is related with radiology..
0.8;to 1
What happens if material is over soaked ?!
Hello Ajin , over soaked ? do you mean over heating ?
@@weldinginspection7239 what will happen to 25 mm plate, if 25 mm thick plate and 60 mm thick plate soaked (pwht) simultaneously in furnace according to 60mm plate requirement
@@Ajin0077 good questions : heat transfer works based on the conduction heat transfer phenomenon , so it does not over heat or over soaked: hear transfer happens uniformly per cross section of both plates. so you can say more length will be heated for 25 mm plates vs 60 mm plate.
if you review iron carbon phase diagram: there is a large temperature range for the heating condition which will cover both metal thickness under same phase.
also , design/welding engineer do consider this fact and provide heating requirement according to the thickness.
@@weldinginspection7239 is there any chance of sensitisation in 25mm plate?
@@Ajin0077 there may be warpage but can be control by proper clamping
how to counting tc
apology, could not get your question , can you please elaborate ?
Sar Hindi mein video Banai hai na
thik hain,
Why is it always an indian
Thank u sir
thank you !