Abstract: The present invention relates to a method of joining a metal part 1 and a non-liquid polymer part 2. The first step of the method is to attach a primer 4 to a metal surface 3 of the metal part 1. The primer 4 is then polymerized so that the metal surface 3 is at least partly covered with surface immobilized polymer brushes 5. Then the metal surface 3 with the polymer brushes 5 is brought into contact with a polymer surface of the polymer part 2, so that an interface is obtained comprising the metal surface 3, the primer 4, the polymer brushes 5 and the polymer surface. Finally, the interface is heated by use of laser welding until the polymer brushes 5 and a part of the polymer part 2 melt or soften and mix to such an extent that the metal part 1 and the polymer part 2 remain joined after cooling. The welding may e.g. be performed so that so that welding seams are obtained along equidistant lines across the surface.

Abstract: A method of processing material with a laser beam. The material has two surfaces. The beam is focused by a multilens objective in a number of focal points which are approximately positioned on a common axis with an angle to the first surface. The focal points are spaced apart and used for cutting plates with several focal points being utilized for melting and cutting the plate material. As a result, a good cutting notch is obtained with good separation of the cut parts and poor adhesion of slag.