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Re: [MW:35512] ASME SEC IX JOJNT DESIGN

By Materials & Welding
Dear Mr. Elavarasan,
As per ASME Section IX, a Welding Procedure Specification (WPS) does not strictly require a joint design 
sketch, but it must address certain variables such as groove design and root spacing. These variables are 
considered non-essential for most welding processes, meaning changes in them do not require requalification 
of the procedure. However, they must be specified in the WPS to guide the welder.
1.Groove Design: While a change in groove design is a non-essential variable for most processes, the WPS should 
   specify the types of joints permitted in production. Stating "all groove designs" is not acceptable; instead, the WPS 
   should list specific types (e.g., V-groove, U-groove) or reference a drawing that illustrates the allowable joints.
2. Root Spacing: This is also a non-essential variable. The WPS should address root spacing but does not need to 
    include a sketch. However, if a sketch or drawing is used, it must be accessible to the welder and accurately depict 
    the joint details.

Client's Request:
Your client's request to add a sketch (like root gap, root face, included angle) to the WPS is reasonable for clarity and 

to ensure that the welder understands the joint requirements. While not mandatory, including such details can enhance 

the WPS's effectiveness in guiding the welder and ensuring consistency in production welds.

Best Practice:

  • Include specific details about the joint design in the WPS.

  • If a sketch is added, ensure it is clear and accessible to the welder.

  • Alternatively, reference a manufacturing drawing that includes these .

Trust it is clear,
rgds,
C Sridhar.

On Sun, 6 Apr 2025 at 08:45, Elavarasan Mech <elavarasan1861994@gmail.com> wrote:

Dear expert 

As per ASME SEC IX in WPS  joints design sketch is required or not  .our client commented in our WPS need to add sketch (like root gap, root face ,included angel )please guide me 


Regards 
ELAVARASAN 

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