Figure 13.

Longitudinal sections (top) and appearances (bottom) of the simulated weld seams (3000 W, 24 m/min) while $\mathrm{d}\sigma /\mathrm{d}T=0$: (a) $\sigma =1.26 \mathrm{N}·{\mathrm{m}}^{-1}$, (b) $\sigma =1.76 \mathrm{N}·{\mathrm{m}}^{-1}$.