Method for producing a heater by means of ultrasound welding; Heater produced according to the method

摘要

The method for the production of a heating body (10), comprises joining two parts (12, 13) of the heating body by torsional ultrasonic welding or transversal ultrasonic welding, where one of the parts is made of steel and/or the other part is made of aluminum alloy. The part consists of aluminum alloy of the type AA3xxx, AA4xxx, AA5xxx, AA6xxx, AA8xxx or of a composite material with a layer of pure aluminum and a layer made of aluminum alloy or of composite material with two layers of aluminum alloys. Sonotrodes are used during the tortional ultrasonic welding. The method for the production of a heating body (10), comprises joining two parts (12, 13) of the heating body by torsional ultrasonic welding or transversal ultrasonic welding, where one of the parts is made of steel and/or the other part is made of aluminum alloy. The part consists of aluminum alloy of the type AA3xxx, AA4xxx, AA5xxx, AA6xxx, AA8xxx or of a composite material with a layer of pure aluminum and a layer made of aluminum alloy or of composite material with two layers of aluminum alloys. Sonotrodes are used during the tortional ultrasonic welding. The part is a heating plate with heating channels (18) running parallel to each other, or a tube body of a heating wall for the perfusion by a fluid heating medium, and another part is a convector with convector channels (20) that are arranged between a surface of the convector and an adjoining surface of the heating plate or the tubular body. A division dimension of the heating plate corresponds to a division dimension of the convector. The joined parts are connected by linear, point-like welding positions with an interval. A periodical linear relative movement takes place between sonotrodes arranged in a row and the convector joined on the heating plate around a common division dimension of the heating plate, and a welding process is carried out between two relative movements. The sonotrodes are lifted before the relative movement around a lift in a direction vertical to a tangential plane on the heating plate and are lowered before the welding process. The lift corresponds to the height of the convector. The sonotrodes are guided in the form of a guide beam equipped with breakthroughs for the sonotrodes. The thickness of the parts is 0.2 mm. The heating plate consists of steel plate with a thickness of 1.11-1.25 mm, and the convector is produced from aluminum alloy with a thickness of 0.12-0.2 mm. The welding duration per point-like welding position is 200-250 ms. The welding pressure with which a contact surface of a sonotrode of a welding device is pressed on a surface of a part to be connected with another part is 20-25 N/mm 2>. The power with which the sonotrode is subjected is 1000-2000 W. An independent claim is included for a heating body.