Mr. Elavarasan,
For a 25 mm test coupon, the welder is qualified to weld base metal thicknesses from 5 mm to 50 mm as per ASME Section IX,
specifically Table QW-452.1(a) for plate welding.
Your WQT was performed on a 25 mm-thick plate, which covers both your 8 mm and 25 mm base plate requirements.
There is no impact requirement for the welder qualification itself unless the construction code or project specification requires
notch toughness testing (impact testing) for the WQT. If impact testing is required, additional restrictions may apply, and you
should refer to the relevant code section for notch toughness requirements.
Always check if impact requirements are imposed by the construction code or client specification, as this can affect qualification limits.
No additional welder qualification is needed for the range 8 mm to 25 mm if the WQT was done on a 25 mm plate.
C Sridhar.
Dear SridharIn my case we have qualified WPS with impact requirementWPS 1. BASE PLATE THICKNESS 8 mmWPS 2. BASE PLATE THICKNESS 25 mmQUALIFIED WQT : 25 mm PLATEWelder qualifications need to be consider impact requirement or not as per ASME sec IXAbove mentioned 25 mm thick base plate WQT. can use production weld ( 8mm to 25mm) please clarifyELAVARASAN--On Wed, 16 Apr 2025 at 2:33 PM sridhar cn <sridharcn305@gmail.com> wrote:Dear Mr. Elavarasan,Plate to Pipe Qualification: A welder qualified on a plate is qualified to weld on pipe, but there are diameter and position restrictionsPipes of OD 24 and 26 inches, are well above 73 mm, so diameter is not a restricting factor for your case.For your 25 mm plate: The qual. range is 12.5 to 50 mm for production welds (with impact testing).24-inch pipe (9.5 mm wall): Not qualified, as the wall thickness is less than the minimum qualified thickness of 12.5 mm.26-inch pipe (14 mm wall) : Qualified, as the wall thickness is within the qualified range.8 mm wall thickness pipe: Not qualified, as it is below the minimum qualified thickness.Welder Qualification (WQT): The same thickness rules apply to the welder as to the procedure, unless the welder was qualifiedon pipe directly, in which case the thickness and diameter ranges may differ.If you need to weld pipes with wall thickness less than 12.5 mm (such as 8 mm or 9.5 mm), you mustrequalify the procedure and welder for that thickness range.Conclusion:
You cannot use the current plate WPS and WQT to weld a 24-inch pipe with 9.5 mm wall thickness or any pipe with 8 mm wall thickness.
You can use them for a 26-inch pipe with 14 mm wall thickness.
To weld thinner pipes (8 mm, 9.5 mm), you must qualify a new WPS and WQT for those thicknesses.
Both 9.5 mm and 14 mm pipes generally require impact testing (as per ASTM A333/A333M-15 and other standards, especially
if impact properties are specified in the material grade or project specifications specify impact toughness as a mandatory property.
References:
ASME Section IX, Table QW-451.1 and QW-452
Welder qualification diameter and thickness ranges.
Hope it is clear.
rgds,
C Sridhar.
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On Wed, 16 Apr 2025 at 12:27, Elavarasan Mech <elavarasan1861994@gmail.com> wrote:Dear Allwe have qualified WPS for ( ASME SEC IX)1. BASE plate 8 mm ( 8TO 16 mm RANGE WITH IMPACT )2 . BASE plate 25 mm ( 16TO 50mm RANGE WITH IMPACT )Qualified WQT BASE PLATE THICKNESS :25 mm( 50 mm max )My question is Can we use this plate WPS and WQT to weld 24inch pipe (9.5mm wall thickness )and 26 pipe(14mm wall thickness ) ,Welder can weld 8 mm wall thickness pipe ? he qualified in 25 mm plate only .please quide meRegardELAVARASAN----
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