FR3014713A1 - WIRE GUIDE FOR WELDING DEVICE - Google Patents

Abstract

The present invention relates to a wire guide 20, 24 for welding device 1 comprising a soldering iron tip 11, the wire guide comprising an inner conduit 23 in which a wire 21 to be soldered. The wire guide comprises a compressed air inlet duct 26 opening into the inner duct 23. The duct 26 for supplying compressed air is arranged so as to generate an overpressure preventing a fuming deposit 22 in the internal duct 23. The invention also relates to the welding device 1 using this wire guide, as well as the method of implementation of the wire guide 20.

Description

The present invention relates to the field of welding devices, and more particularly to a wire guide for a welding device, as well as to the associated welding method. The welding devices concerned by the present invention are formed by a soldering iron, comprising a soldering iron tip, and a wire guide automatically feeding wire to be welded. One of the drawbacks of these types of welding devices, and consequently of the method implementing it, comes from the fact that during a welding with these types of devices and an automatic supply of solder wire, such as for example tin the rosin generated by the solder condenses in the wire guide and blocks the output of the wire to be welded. It is then necessary to dismantle and clean the yarn feed system regularly in a preventive manner, but also in a curative manner when using the device. In the latter case, it is then necessary to completely stop the operation of the welding device. The regular shutdown of the device generates a waste of time and causes a decrease in efficiency and effectiveness of welding operations. The present invention therefore aims to overcome one or more of the disadvantages of welding devices of the prior art by providing a wire guide for soldering device, and the welding device using it, not requiring a regular stop of the welding device. For this, the present invention provides a wire guide for soldering device comprising a soldering iron tip, the wire guide comprising an inner conduit in which a wire to be soldered, the wire guide comprising a compressed air supply conduit. opening into the internal conduit. The supply of compressed air creates an overpressure in the guide wire, which prevents rosin fumaroles from entering the guide wire and settle there. According to one embodiment of the invention, the compressed air supply duct is arranged to generate an overpressure preventing a fuming deposit in the inner duct.

According to one embodiment of the invention, the compressed air supply duct is disposed in the middle of the wire guide along the longitudinal axis of the wire guide. This arrangement allows a better distribution of the compressed air in the inner conduit.

The invention also relates to a welding device using the wire guide according to the invention. According to one embodiment of the invention, the welding device is automatic. The invention also relates to an automatic welding process, using the wire guide according to the invention, comprising a step of injecting compressed air. According to one embodiment of the invention, the method according to the invention comprises a prior step of heating a soldering iron of the device. According to one embodiment of the invention, the method according to the invention comprises a welding step carried out at the same time as the compressed air injection step. According to one embodiment of the invention, the flow rate of the injected compressed air is regulated so as not to create an air flow on the soldering iron tip and so as to create a simple overpressure. Other objects, features and advantages of the invention will be better understood and will appear more clearly on reading the description given hereinafter with reference to the appended figures given by way of example and in which: Figure 1 is a schematic representation of the device according to the prior art, - Figure 2 is a schematic representation of the device according to the invention, - Figure 3 is a schematic representation of the method according to the invention. The present invention relates to a wire guide for welding device 1, the welding device 1 comprising such a wire guide, and a method using this welding device 1.

The welding device 1 according to the invention, illustrated in Figure 2, comprises a soldering iron 10 equipped with a soldering iron tip 11. The device 1 also comprises a wire guide 20. The wire guide 20 concerned by the present invention is an automatic wire guide. That is to say, it feeds the wire device 21 to be welded automatically. It is formed by a body 24. According to one embodiment of the invention, the body is of cylindrical external shape, square or rectangle or any other form compatible with its use. The body 24 of the wire guide 20 comprises an inner conduit 23 in which the wire 21 to be soldered.

In the context of the invention, the wire 21 to be welded is made of a tin-based alloy. The welding device 1 also comprises conventional operating means, not illustrated, for controlling the welding and for operating the wire guide 20.

When using the welding device 1 according to the prior art, illustrated in FIG. 1, the tip 11 of the soldering iron heats the tin wire 21 fed by the wire guide 20, which makes it possible to perform the soldering . This welding generates rosin fumaroles 22 which condense at the base of the inner conduit 23 of the wire guide 20, and it is these condensed fumaroles 25 which obstructs it, as can be seen in FIG.

In order to avoid this obstruction, the wire guide 20 of the device according to the invention, illustrated in FIG. 2, comprises an additional compressed air supply duct 26, illustrated in FIG. 2. The inlet duct 26 of FIG. Air opens into the inner conduit 23 of the guide wire 20. This conduit 26 of compressed air inlet is arranged to generate an overpressure preventing the deposition of fumaroles. According to one embodiment of the invention, the inlet conduit 26 of compressed air is disposed in the middle of the wire guide 20 along its longitudinal axis X. This arrangement allows a better distribution of the compressed air in the inner conduit 23 The circulation of the compressed air is illustrated by the arrows 27.

The conduit 26 of compressed air supply is a conventional conduit whose dimensions are adapted to those of the wire guide 20, and allow the injection of compressed air at the desired flow rate. The flow rate of the compressed air injected into the inner conduit is adjusted so as to create a simple overpressure in the wire guide 20, which prevents the rosin fumaroles 22 from entering the wire guide 20 and depositing thereon. The purpose of this supply of compressed air is to provide an overpressure without generating air blast. Thus, this overpressure prevents the fumaroles from entering the base of the conduit 23 of the wire guide, without cooling the tip 11 of soldering iron during welding. Indeed, the flow rate is defined so as to generate an overpressure, without generating air blast that can cool the soldering iron tip 11. The suppression of fumarole deposits in the inner conduit 23 of the wire guide 20 thus avoids necessary stops, with the devices of the prior art, to unclog the wire guide 20.

The injection 32 of compressed air is carried out at the same time as the soldering step 33 of heating the wire 20 to be welded with the soldering iron tip, previously heated 31, and to deposit the molten wire on the element to weld, illustrated in Figure 3. More specifically, the air injection is performed at the same time as the fumaroles release, at least once during the duration of the welding Example of implementation of the invention: The device according to the invention was set up on an automatic welding robot with a soldering iron tip heated to 430 ° C and an automatic system of supply of tin wire. This robot welds 20 points on an ignition ramp.

The compressed air supply is regulated so as not to create airflow on the soldering iron tip. The soldering iron tip is not cooled, and the fumaroles do not settle in the guide wire. The use of this compressed air supply has eliminated the stops necessary to unclog the guide wire. The device according to the invention thus makes it possible to switch from a stop frequency every 4 hours to no stop. It also allows a production rate gain of 3%. The scope of the present invention is not limited to the details given above and allows embodiments in many other specific forms without departing from the scope of the invention. Therefore, the present embodiments should be considered by way of illustration, and may be modified without departing from the scope defined by the claims.

Claims (9)

REVENDICATIONS1. Wire guide 20, for welding device 1 comprising a soldering iron tip, the wire guide 20 comprising an inner conduit 23 in which a wire 21 to be soldered, characterized in that it comprises a feed conduit 2 of compressed air opening into the internal duct 23. 2. Wire guide 20 according to claim 1, wherein the conduit 26 of compressed air inlet is arranged to generate an overpressure preventing a fuming deposit in the inner conduit 23. 3. Wire guide 20 according to one of claims 1 to 2, wherein the conduit 26 of compressed air supply is disposed in the middle of the wire guide along the longitudinal axis X of the wire guide 20. 4. A welding device 1 using the guide wire 20 according to one of claims 1 to 3. 5. The welding device 1 according to claim 4 wherein the device is automatic. 6. Automatic welding process using the wire guide according to one of claims 1 to 3, comprising a step 32 of injection of compressed air. 7. The method of claim 6, comprising a prior step of heating 31 a soldering iron of the device. 8. Method according to one of claims 6 to 7, comprising a soldering step 33 carried out at the same time as the injection step 31 of compressed air. 9. Method according to one of claims 6 to 8, wherein the flow rate of the injected compressed air is regulated so as not to create air flow on the soldering iron tip and so as to create a simple overpressure .25