Abstract: Provided is a laser welding process, including: emitting and propagating a laser beam having a diameter of between 30 pm and 1.5 mm along a first optical axis; refracting said laser beam including deviating the faster beam along a second optical axis that is different to said first optical axis; and moving the laser beam simultaneously with said refracting step, comprising rotating said laser beam in relation to an axis of rotation substantially parallel to said first optical axis maintaining the arrangement of said second optical axis constant with respect to said first optical axis, wherein said moving step, said second optical axis is moved in a feed direction so as to execute a helicoidal weld bead, and said rotation is performed at a speed of between 10 Hz and 500 Hz, and in that said laser beam has a diameter of between 30 pm and 1.5 mm.