Fig. (1) Residual stresses in the HAZ: a) profile after [6]; b) mean values observed on the cut surface at half thickness; σ₁₁ and σ₂₂ are the principal directions, respectively along and perpendicular to the laser cut (cf. ϕ=0° and ϕ=90° in a)); σ₁₂ is at ϕ=45° from the principal directions.