PWHT-How to read a PWHT Chart [QAQC Welding]

[@WeldingNDTInspection]

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[@ridhokurniawan2821]

Sir what the references we took the slope kI/Im in that positin of curve ? I mean why we took at 400°c ?

[@raahemaarifat9900]

Why u selected particular location to evalute slope in AB line,,is there any rule ,or random we can select?if i take intersection point at A to B with differenc slope line then value come differeny

[@arul8222]

SIR How to select IM AND PQ LINE.

[@awstalib6213]

Great explanation well done

[@WeldingNDTInspection]

Thanks

[@prashantb4346]

Technique of teaching is really great. Very very nice work. Salute to u sir. Plz make a videos on PWHT requirement according to Code , standards. Also videos on advance NDT technique like TOFD and all.

[@vinishsureshkannan5402]

What is the essential of pwht chart

[@feedbackgenerico6147]

But why IM line is on that particular point you took.

[@WeldingNDTInspection]

This is the example where I can explain you. And if you understand carefully IM line is correct

[@anoopsp6246]

And also multiple thermo couple is using for record the value so different colour will also come.

[@ferozekhan3228]

Sir I want now how to operate the meshing Manuel&remote &how to fould coil & canneckshion

[@samiknag6499]

Sir, Please tell me what is the tolarence of cooling fluctuations

[@sankarvijayan]

I see all of your videos,great job Awsm👏

[@WeldingNDTInspection]

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[@muhammedanzer796]

Please tell me How to decide the location of the slope curve at a rate of the location?

[@WeldingNDTInspection]

Pick two points on the line and determine their coordinates. Determine the difference in y-coordinates of these two points (rise). Determine the difference in x-coordinates for these two points (run). Divide the difference in y-coordinates by the difference in x-coordinates (rise/run or slope).

[@muhammedanzer796]

@@WeldingNDTInspection thank you

[@muhammedanzer796]

@@WeldingNDTInspection when we marking slope curve on heating rateAB, It's should be same position in cooling curve? Suppose I marked 400°c in heating curve, can I make slope curve in 600°c in cooling curve?

[@anoopsp6246]

Can you tell us the latest requirements for do the pwht. Like thickness and c.e.v

[@WeldingNDTInspection]

The 2014 Edition of ASME B31.3, Process Piping [1], introduced significant changes to the post weld heat treatment (PWHT) requirements for P-No. 1 carbon steel materials. In particular, PWHT is no longer a mandatory requirement for any wall thickness provided that multi-pass welding is employed for wall thicknesses greater than 5 mm (3/16 of an inch) and a minimum preheat of 95°C (200°F) is implemented for wall thicknesses greater than 25 mm (1 inch). Detailed fracture mechanics analyses have shown that the lack of a mandatory PWHT requirement for thicker P-No. 1 components may result in a significant increase in risk for brittle fracture failures due to near-yield level weld residual stresses. Given the concern throughout the pressure vessel and piping community regarding potential brittle fracture failures, this updated PWHT guidance is examined.

[@anoopsp6246]

@@WeldingNDTInspection thanks sir

[@anoopsp6246]

@@WeldingNDTInspection is it mandatory to BHN TEST AFTER THE PWHT AND ALSO IF THE VALUE EXCEED THE PERMIT VALUE WHAT WILL DO. AS per ARAMCO STD it's saying more test on all sample need to carried out but in all case still the value exceed what action we can do.

[@mohdfarhad5431]

@@WeldingNDTInspection 7

[@yogeshshinde9400]

Dear Sir, I have a question for you. In my shop, I am welding 5 mm thick mild steel plates continuously ( which is using in high temp. Applications) Is thier any requirement for that case to preheat and post heat heat treatment. If yes.. Please tell accordingly the systematic procedure as below, 1. Which method should I use to preheat and post heat the welding. 2. How much should I consider heating temp., soaking time, cooling time.. Request you to please look into this case immediately. Thank you

[@WeldingNDTInspection]

Dear, it's mild steel with 5 mm thickness, no need preheat and PWHT, thickness more than 25 mm required PWHT.

[@yogeshshinde9400]

Thank you sir 👍

[@WeldingNDTInspection]

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