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Up Topic Welding Industry / Metallurgy / CTOD Testing
- By stef33000 (*) Date 11-09-2019 15:47

Does some have good knowledged in CTOD Testing.

We did a Project 7 yeaars ago and the Specification was:

- CTOD Weld Metal
- Thcchiness 22.2mm
- NP direction ( like Charpy Trasnverse direction)
- Sample B x 2B therfore 20 x 40mm (20mm is the B = 22.22 minus the machined ) 20mm)
- Temperature -10°C
- A/W = 0.45 to 0.55
- CTOD was 0.3-0.4mm

Now for the current project we have

- CTOD Weld Metal
- Thickness 23.4mm
- NQ direction (Notch from Internal Diameter of the pipe)
- Temperature -18°C and +75°C
- A/W = 0.45 to 0.55
- CTOD is 0.15-0.2mm

The previous Value were 0.3 to 0.4mm wheras now we have 0.15 to 0.2mm

That we see is that the temperature is not essential as -18°C versus -10°C as CTOD -18°C is equite egual to +75°C. +/-0.05mm CTOD.

As the Sample was B x 2B with 40mm of thickness and therfore as A0 = 20mm the thickness wasA0 20mm versus A010mm

As I know from CTOD testing the CTOD must be performed for thickness more than 12mm to avoid surface effect. (and not less). The fact is that with A/W = 0.5 the thcikness is now 10mm.

Note that the chapy are egual for the previous Job and the new job around 100J at the same temperature.

My question is:

Why did we get 0.4mm and now we have 0.2mm for the same consumable? What is the interpretation to have?


NP vs NQ direction
BxB vs Bx2B Samples

Up Topic Welding Industry / Metallurgy / CTOD Testing

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