DE-102019214276-B4 - Powder feed nozzle and welding device

Abstract

Powder feed nozzle (100) for a welding device, with a base body (110) which has a main section (111) and an outlet section (112) adjacent to the main section (111), wherein the outlet section (112) has an outlet opening (113), with at least one coolant supply line (115A, 115B, 115C) extending axially along the main section (111) and with at least one coolant discharge line (116A, 116B, 116C) extending axially along the main section (111), wherein the at least one coolant supply line (115A, 115B, 115C) and the at least one coolant discharge line (116A, 116B, 116C) are connected via at least two coolant connecting lines (117A, 117B, 117C) extending radially at least partially around the outlet section (112), characterized in that at least two coolant pairs (114A, 114B, 114C) are each provided with a coolant supply line (115A, 115B, 115C), a coolant discharge line (116A, 116B, 116C) and at least two coolant connecting lines (117A, 117B, 117C), wherein the coolant connecting lines (117A, 117B, 117C) of the individual coolant pairs (114A, 114B, 114C) are arranged parallel to each other in a row along at least one part of the length of the exit section (112).

Inventors

• Lisa Evertz
• André Bitter
• Lars Lemke

Assignees

• VOLKSWAGEN AKTIENGESELLSCHAFT

Dates

Publication Date

20260513

Application Date

20190919

Claims (7)

1. Powder feed nozzle (100) for a welding device, comprising a base body (110) which has a main section (111) and an outlet section (112) adjoining the main section (111), wherein the outlet section (112) has an outlet opening (113), with at least one coolant supply line (115A, 115B, 115C) extending axially along the main section (111) and with at least one coolant discharge line (116A, 116B, 116C) extending axially along the main section (111), wherein the at least one coolant supply line (115A, 115B, 115C) and the at least one coolant discharge line (116A, 116B, 116C) extend via at least two coolant connecting lines (117A, 117A, 116C) extending radially at least partially around the outlet section (112). 117B, 117C) connected The devices are characterized in that at least two pairs of coolants (114A, 114B, 114C) are provided, each with a coolant supply line (115A, 115B, 115C), a coolant discharge line (116A, 116B, 116C) and at least two coolant connecting lines (117A, 117B, 117C), wherein the coolant connecting lines (117A, 117B, 117C) of the individual pairs of coolants (114A, 114B, 114C) are arranged parallel to each other in a row along at least a region of the length of the outlet section (112).
2. Powder feed nozzle (100) after Claim 1 , characterized in that the at least two coolant connection lines (117A, 117B, 117C) have a smaller diameter than the coolant supply line (115A, 115B, 115C) and the coolant discharge line (116A, 116B, 116C).
3. Powder feed nozzle (100) after one of the Claims 1 or 2 , characterized in that the at least two coolant connection lines (117A, 117B, 117C) each run at an angle of 2° ≤ α ≤ 20° to a perpendicular axis (A) of a longitudinal axis (L) of the base body (110).
4. Powder feed nozzle (100) after one of the Claims 1 until 3 , characterized by a protective gas supply (118) arranged on the base body (110).
5. Powder feed nozzle (100) after Claim 4 , characterized in that the protective gas supply (118) has a protective gas supply line (119) extending axially along the main section (111), which in the area of the outlet section (112) is split into several protective gas outlet lines (121), wherein the several protective gas outlet lines (121) each have a protective gas outlet opening (122), wherein the protective gas outlet openings (122) of the several protective gas outlet lines (121) are arranged in a ring-shaped distribution around the outlet opening (113) of the outlet section (112).
6. Powder feed nozzle (100) after Claim 5 , characterized in that the protective gas supply (118) in the area of the outlet section (112) has a protective gas distribution line (120) extending radially around the base body (110), which is connected to the protective gas outlet lines (121).
7. Welding device, with a powder feed nozzle (100), which according to one of the Claims 1 until 6 is trained.

Description

The invention relates to a powder feed nozzle for a welding device. Furthermore, the invention relates to a welding device with such a powder feed nozzle. Powder feed nozzles of this type are typically used to supply a powder-gas mixture during a welding process. In a welding process, a weld pool is created on the surface of a component, into which a powdered filler material is introduced via a feed nozzle. The filler material melts, forming a layer on the component surface that is fused to the base material at the joint. Welding can be performed, for example, using a laser beam. During the welding process, a high level of heat is generated, particularly high reflected heat, which affects the feed nozzle. It is therefore necessary to cool the feed nozzle during the welding process. However, feed nozzles are usually very long and have a very small diameter, which makes cooling such nozzles difficult. The DE 26 51 185 A1 This describes a cooling device for a plasma torch in which the nozzle is surrounded by a coolant flow. Supply and discharge channels are located between the nozzle body and a surrounding housing, through which the coolant is directed. The nozzle is externally finned to improve heat transfer and enable more efficient cooling. This design serves to reliably dissipate the extremely high temperatures of the plasma jet (up to several tens of thousands of degrees Celsius) generated by plasma torches. The DE 10 2017 215 839 A1 The invention relates to an optical module for a machine for processing workpieces and/or for producing shaped parts by selectively solidifying material powder into contiguous areas using a laser beam. The optical module comprises a housing with means for detachably mounting the optical module to the machine and a collimation optics changer detachably arranged in the housing, with at least two collimation optics movable into a beam path of the laser beam for collimating the laser beam. According to the invention, the collimation optics changer has a mechanism for automatically changing the collimation optics. The plasma generation system of the US 4 780 591 A The system comprises a plasma gun with a hollow cylindrical anode element, a hollow cylindrical intermediate element that is electrically insulated and arranged coaxially to the anode element to form a plasma gas channel through the intermediate element and the anode element, and an axially movable cathode element. The intermediate element consists of tubular segments separated from each other by elastic, pressurized insulating rings. The arc radiation is shielded from the spacer rings by meanders in the slots of the intermediate segments and additionally by ceramic barrier rings. An electric motor or a pneumatic piston, responding to a measurement of the arc voltage, continuously adjusts the axial position of the cathode tip relative to the anode nozzle to maintain a predetermined arc voltage. The DE 41 20 790 A1 Figure 1 shows a nozzle for the surface treatment of metallic workpieces, in which a protective gas and powder are guided through the nozzle to apply materials or treat surfaces in a targeted manner. The design includes a guide for the powder and protective gas, a protective cap, and a specially designed nozzle to ensure uniform powder distribution and a stable flow of the protective gas. The device serves to process metallic surfaces more efficiently and uniformly using application processes such as coating, alloying, or similar methods. The WO 2018 / 132 566 A1 describes a laser soldering or laser brazing system that has a special design for cooling the wire feed. The US 2014 / 0 251 973 A1 The figure shows a cooled welding torch with a cooling circuit that extends from a nozzle holder to a gas nozzle. The gas nozzle is attached to the welding torch by means of a defined rotation. The cooling circuit is guided by a deflector located above the nozzle holder, which can be rotated together with the gas nozzle. The path of the cooling circuit can be switched by the position of the gas nozzle. From the US 4 373 657 A An automated device for feeding solder or brazing material (e.g., wire or strip) into a soldering or welding process is known. The invention optimizes both the thermal management and the material feed to enable more precise and faster soldering or brazing. It is therefore the object of the present invention to provide a powder feed nozzle and a welding device in which the process can be further improved. This problem is solved by the features of the independent claims. Advantageous embodiments and further developments of the invention are specified in the dependent claims. The powder feed nozzle according to the invention has a base body comprising a main section and an outlet section adjacent to the main section, the outlet section having an outlet opening. Furthermore, the powder feed nozzle has at least one coolant supply line extending axially along the main section and at least one coolant discha