Pressure welding forces the cross bar into the bearing bar under heat and pressure, producing a joint that is part of both bars rather than a bead sitting on top of them. That is what lets a welded panel carry load across its span without the cross bars working loose.

Cross bar shape is the choice most buyers skip. A twisted bar gives grip underfoot and is the right answer on a walkway; a flat bar gives a cleaner appearance and a surface that sweeps and washes more easily, which is why it appears in architectural and food area work.