Re: [MW:35075] test coupon dimension for mechanical testing

Dear,

According to ASME Section IX, the dimensions of the test coupon plate for mechanical testing depend on the type of test being performed and the thickness of the material. Here is an overview based on the thicknesses you mentioned (6mm, 20mm, and 25mm):

1. Tensile Test Specimens:

For tensile tests, the standard dimensions for the test coupon are defined in QW-462.1(a) and QW-462.1(b) of ASME Section IX.

• Plate Thickness ≤ 8 mm (e.g., 6 mm):

  • For plate thickness less than or equal to 8 mm, the entire thickness of the test specimen shall be tested.
  • The specimen width shall be 12.5 mm.
  • The length of the reduced section should be at least 50 mm for the tensile test.

• Plate Thickness > 8 mm (e.g., 20 mm and 25 mm):

  • For thicker plates, the thickness of the test specimen taken from the coupon should match the thickness of the welded plate.
  • The width of the test specimen is typically 12.5 mm.
  • The length of the reduced section should be at least 50 mm for the tensile test.

2. Bend Test Specimens:

For bend tests, the dimensions of the test coupons are specified in QW-462.2 of ASME Section IX.

• Plate Thickness ≤ 10 mm (e.g., 6 mm):

  • The width of the bend specimen is 38 mm.
  • The length of the bend specimen should be sufficient to ensure that a 180-degree bend can be made without the specimen being constrained.

• Plate Thickness > 10 mm (e.g., 20 mm and 25 mm):

  • The width of the bend specimen is typically 38 mm.
  • The thickness of the bend specimen should be 10 mm, so for plates thicker than 10 mm, the bend specimen is typically machined down to 10 mm thickness.

3. Charpy V-Notch Impact Test Specimens (if required):

For impact testing, the dimensions are given in QW-462.3 of ASME Section IX.

• Standard Charpy V-Notch Test Specimens:

  • The standard specimen size is 10 mm x 10 mm x 55 mm with a V-notch.

• Sub-Size Specimens:

  • If the material thickness does not allow for a full-size specimen, sub-size specimens can be used, e.g., 10 mm x 7.5 mm or 10 mm x 5 mm.

Summary of Specimen Dimensions by Thickness:

• 6 mm Thickness:

  • Tensile: Full thickness, 12.5 mm width, 50 mm reduced section length.
  • Bend: 38 mm width, full thickness.

• 20 mm Thickness:

  • Tensile: Full thickness, 12.5 mm width, 50 mm reduced section length.
  • Bend: 38 mm width, machined down to 10 mm thickness.

• 25 mm Thickness:

  • Tensile: Full thickness, 12.5 mm width, 50 mm reduced section length.
  • Bend: 38 mm width, machined down to 10 mm thickness.

It is essential to follow the exact requirements specified in ASME Section IX for the dimensions of test coupons to ensure compliance and the validity of the mechanical tests.

AB

On Thu, 13 Jun 2024 at 15:53, Mashood Khan <mashood@epic.com.pk> wrote:

I would like to know about the dimensions of the test coupon plate which needs to be cut for mechanical testing , as per ASME SEC IX.

Thickness are 6mm, 20mm 25mm.

Regards,

Mashood Ahmed Khan

Site Engineer

EPIC Pvt. Ltd.

P:03462794988, 0309-8885421

E: Mashood@epic.com.pk, mashoodrak1@gmail.com            

 "The man who best understands time is he who is not taken aback by its proceedings." 

 (Ali Ibn Abi Talib)

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06/13/24, 02:14:36 PM

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Best regards,

Amol K.B

B.E(Mech), CSWIP 3.2.2, NACE CIP 1 & ASNT LII(4M)

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