As in, "Channel girders are used in the construction of bridges or highway overpasses."

As used here, the word "artesas" is related to "artesa" ("chute, tray, or box [such as the long boxes in which mortar is mixed]") and "arteson" ("caisson, coffer, tub, or U-shaped trough"). It has nothing to do with "artesano/na" ("skilled worker, artisan, or mechanic") or "artesiano/na" ("artesian"). -- Hope this helps!