Method and arrangement for ultrasonic welding

A method for ultrasonic welding of material webs which move in a feeding direction between ultrasonic horns of an ultrasonic welding arrangement and an anvil holder on which anvils are disposed in a given pattern, so as to enable high-speed webs to be welded, said method comprising:

• determining a welding width of an ultrasonic horn, said determining step including:
• (a) performing a first test welding of the webs while the webs move at a desired speed, said horn having a first width in a direction transverse to the feeding direction;
• and
• (b) performing further test-welding of the webs while the webs move at the desired speed with ultrasonic horns having different widths until a strong welding bond is obtained;
• after determining the welding width of said ultrasonic horn, disposing a requisite number of said ultrasonic horns for obtaining a total weld width of the welding arrangement sequentially across the webs transversely in relation to the direction of web movement;
• and
• welding the material webs across the total weld width.