METHOD FOR PRODUCING A CONNECTION INTERFACE IN A FILTER ELEMENT AND DEVICE FOR PRODUCING THE SAME

摘要

The invention relates to a method for producing a connection interface in a tubular filter element for filtering liquids, comprising a filter mat (10), the opposite ends (14) of said filter mat being interconnected in a connection position by means of a plane weld seam (28) which is provided with an impressed strip in the region of the free ends (14) of the filter mat. A region is provided between the impressed weld seam (30) formed in such a way and the beginning of the transition towards the tubular filter mats, in which a smooth weld seam (32) is applied without impression in a flat strip along the ends (14) of the filter mat. This enables the ends of the filter mat to be welded together in a strong and long-lasting manner, the impressed weld seam being simultaneously unloaded of any stress by means of the smooth weld seam. The invention also relates to a device for carrying out the method.