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(a) Correlation of the porosity and the welding speed for the arc modes CMT, CMT-ADV and CMT-PADV with a wire-feed speed of approx. vw = 9.4 m/min and (b) the optically observed porosity in the cross-sections of the five-layer wall structures for the different arc modes at a welding speed of vS = 0.4 m/min.
