A method of welding by concentrating a laser beam onto approximately a 0.5 mm (0.020 in) diameter spot to melt and join the two surfaces.
The steel’s appearance, quality, and material characteristics are only slightly changed by the laser’s heat.
The width of the laser welding bead is less than 1 mm. Laser welded tailored blanks are most commonly used for automobile parts.

A method of welding where two layers of steel panels are overlaid and pressure is applied to while the parts are eclectically welded. Mushroom welding is superb in formability but poor in appearance.
The width of the welding bead is roughly 5 mm (0.20 in).

A method of welding where a high temperature plasma current is applied to the butted area joining the parts using thermal conduction.
It is suitable for automated processes with a low equipment cost.
The width of the welding bead is 3-4 mm (0.12-0.16 in).