PSI - Issue 38

Tobias Jonsson et al. / Procedia Structural Integrity 38 (2022) 411–417

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Jonsson, Narström and Barsoum / Structural Integrity Procedia 00 (2021) 000 – 000

Figure 3. Butt welds in Strenx ® 1100Plus a) as-welded, b) HFMI treated, c) TIG dressed.

4. Results 4.1. Weld Quality

With the Winteria® system it could be determined how many welds that fulfilled the criteria for each quality level. A limit of 90 % of the total weld length was set which must fulfill the criteria for the weld quality level to be qualified for the current quality level. The overall quality level of each specimen is presented for each post treatment in figure 4 where the overall quality level of the specimen is set to the lowest of the two sides.

Figure 4. Distribution of weld quality levels (classes) for Strenx® 1100Plus butt welds a) as-welded, b) TIG dressed and c) HFMI treated.

4.2. Static Strength According to Eurocode 3 the load condition is fulfilled if

(1) where σ ⊥ is the tensile stress perpendicular to the weld, τ ⊥ is the shear stress perpendicular to the weld, τ ││ is the shear stress parallel to the weld, f u is the ultimate tensile strength of the weaker part of the weld, β w is a constant depending on the weld filler γ M2 is a safety factor which in this case is 1.25. In the investigated load case with butt welds τ ││ is zero and the other two stress components can be derived

(2)