PSI - Issue 42

Tadeu Messias Donizete Borba et al. / Procedia Structural Integrity 42 (2022) 276–283 Tadeu Messias Donizete Borba / Structural Integrity Procedia 00 (2019) 000 – 000

280

5

In the FCAW joint, it was obtained a linear fusion line on the straight side of the bevel, an important feature for notching the CTOD specimens. However, due to the low heat input used, 35 weld passes were deposited, distributed in 11 layers, which provided the generation of a narrow HAZ of 1.56 ± 0.08 mm, with several regions reheated by subsequent passes, characteristics that make it difficult to correctly mark the notch and enhances the formation of LBZ which, as will be presented, will compromise the results of CTOD. The SAW joint has a lower deposition of passes (18 spread over 7 layers), which was expected due to the high heat input used, providing the formation of an extensive HAZ, 3.89 ± 0.21. However, due to the higher welding energy used, there is a greater attack of the bevel wall during the deposition of each pass, forming an irregular fusion line that will compromise the fraction sampling of the CGHAZ region by the CTOD notch.

Fig. 2. Optical image of FCAW Joint (0.8 kJ/mm). 35 passes and 11 layers. Etched with 4% Nital.

Fig. 3. Optical image of SAW Joint (4.5 kJ/mm). 18 passes and 7 layers. Etched with 4% Nital.