JP3209619U - Welding equipment - Google Patents

Abstract

A welding apparatus that eliminates the effects of air or residual gas in a pipe at the start of welding and stably switches between a shield gas suitable for starting welding and a shield gas suitable for stabilizing welding. I will provide a. An arc welding welding apparatus using a shielding gas, comprising a welding machine, a wire feeding device, a welding torch, and a shielding gas supply device. Is composed of a first shield gas supply device 20 connected in the vicinity of the welding torch 3 and a second shield gas supply device 30 connected upstream of the first shield gas supply device 20. . The shield gas supplied from the first shield gas supply device 20 is a mixed gas of argon gas and carbon dioxide gas, and the shield gas supplied from the second shield gas supply device 30 is carbon dioxide gas. [Selection] Figure 1

Description

  The present invention relates to a welding apparatus for arc welding using carbon dioxide gas, mixed gas or inert gas as a shielding gas.

  In welding of steel materials, an arc welding method using carbon dioxide gas, mixed gas or inert gas as a shielding gas is widely used. The advantages of this welding method are that the mechanical properties of the weld are as excellent as the welding method using a low hydrogen-based coated arc welding rod, high efficiency, large penetration, and welding in all positions. It is possible, it is a visible arc, etc.

  Carbon dioxide gas used as a shielding gas is characterized by being very inexpensive as compared with an inert gas or mixed gas of argon or helium, but has an insufficient welding performance. The mixed gas includes carbon dioxide mixed with argon gas, oxygen gas mixed, carbon monoxide mixed gas, argon gas mixed with oxygen gas, etc. Compared with carbon dioxide alone Thus, it is expensive but cheaper than inert gas, and the welding performance is improved. For example, in a mixed gas of carbon dioxide gas and argon gas, the bead shape is improved, the amount of spatter generated decreases, the arc temperature rises, and the amount of penetration increases. In the mixed gas of carbon dioxide gas and oxygen gas, the arc temperature rises, the melting rate of the wire increases, and the penetration amount increases.

  Conventional welding equipment for arc welding using shield gas is composed of a welding machine, wire feeding device, welding torch and shield gas supply device as main components, and the shielding gas is made of the material and shape of the welding object. Alternatively, one optimum gas was selected from carbon dioxide, mixed gas, and inert gas depending on the welding conditions. However, since such a welding apparatus uses one kind of shield gas from start to finish and always supplies the amount of shield gas supplied at the start of welding, the welding performance and the amount of shield gas consumed at the start of welding are as follows. There was a problem.

  On the other hand, in Patent Document 1, in arc welding using carbon dioxide, mixed gas or inert gas as a shielding gas, the welding performance at the start of welding is improved and the consumption of the shielding gas is reduced. A welding device has been proposed.

  FIG. 3 is an overall configuration diagram showing a welding apparatus according to a conventional example described in Patent Document 1. In FIG. In FIG. 3, the welding apparatus 200 includes a welding machine 1, a wire feeding device 2, a welding torch 3, and a shield gas supply device 40 as main components. The welding machine 1 is pipe-connected so that the shield gas is supplied from the shield gas supply device 40 via the connection pipe 7a and the shield gas is supplied to the welding torch 3 via the connection pipe 7b. The welding machine 1 is connected so as to supply a welding current to the welding torch 3 via the power cable 5a and to the workpiece 10 via the power cable 5b. The wire feeding device 2 includes a wire reel 2 a and supplies a welding wire 6 to the welding torch 3.

  The shield gas supply device 40 further includes two types of shield gas supply sources, that is, a mixed gas cylinder (shield gas supply source) 41a in which a mixed gas of carbon dioxide gas and argon gas having good welding performance is filled at high pressure, and an inexpensive carbon dioxide. Carbon dioxide gas cylinder (shield gas supply source) 41b filled with gas at a high pressure, a set of switching devices 44, a connecting pipe 43a, a connecting pipe 45a, a connecting pipe 43b, and a connecting pipe for connecting the switching apparatus 44 and the gas cylinders 41a and 41b 45b and a regulator 42a and a regulator 42b provided in the middle thereof. The switching device 44 further includes an electromagnetic valve 44a and an electromagnetic valve 44b each having one end connected to the connection pipe 45a or the connection pipe 45b and the other end connected to the connection pipe 7a.

  When welding is performed by the welding apparatus 200, first, the supply amount of the mixed gas required at the start of welding is set with the regulator 42a, and the supply amount of carbon dioxide gas required at the time of steady welding is set with the regulator 42b. Next, the electromagnetic valve 44 a of the switching device 44 is opened (the electromagnetic valve 44 b is closed), and the mixed gas is supplied from the mixed gas cylinder 41 a to the welding machine 1. Next, the welding machine 1 is operated to start supplying the mixed gas and the welding current to the welding torch 3, and also to start supplying the welding wire 6 from the wire feeding device 2 to the welding torch 3, so Start. Even when the arc formation conditions of the welding started in this way are unstable, the shielding gas is a mixed gas with good welding performance, so that the penetration is sufficient and the bead shape is good. Spatter generation is small and good welding is performed.

  After starting welding, when the arc forming conditions and the state of the formed arc are stabilized, the switching device 44 is operated to switch the shield gas from the mixed gas to the carbon dioxide gas while continuing the welding. That is, carbon dioxide is supplied to the welding machine 1 from the carbon dioxide cylinder 41b side. At the time of switching, the electromagnetic valve 44b is opened and then the electromagnetic valve 44a is closed and the two kinds of shielding gas are temporarily supplied simultaneously so that the supply of the shielding gas is not interrupted. Thereafter, in this state, a necessary amount of carbon dioxide gas is supplied as a shielding gas, and welding is continued.

  In this way, the welding apparatus 200 supplies an expensive shield gas with good welding performance only for a short time at the start of welding with poor welding performance, and then supplies an inexpensive shield gas after a stable state with good welding performance. It is supposed to be. Thereby, while improving the welding performance at the time of a welding start, the consumption of shielding gas can be reduced.

Registered Utility Model No. 3035005

However, the above welding apparatus 200 has the following problems.
(1) At the start of welding, air was present in the pipe, and no consideration was given to purging the pipe with a shielding gas.
(2) There was no stability in switching between mixed gas (shield gas suitable at the start of welding) and carbon dioxide gas (shield gas suitable after welding was stabilized).
(3) At the end of welding, carbon dioxide (shield gas suitable after welding is stabilized) remains in the pipe, and carbon dioxide gas (shield gas suitable after welding is stabilized) remaining at the start of the next welding is the welding torch. This has affected the welding performance at the start of welding.

  The present invention solves the above-described conventional problems, eliminates the influence of air in pipes and residual gas at the start of welding, and provides a shielding gas suitable for starting welding and a shielding gas suitable for after stable welding. The welding apparatus which performed switching of these stably is provided.

  In order to solve the above problems, a welding apparatus of the present invention is a welding apparatus for arc welding using a shielding gas, which includes a welding machine, a wire feeding device, a welding torch, and a shielding gas supply device, The shield gas supply device includes: a first shield gas supply device connected in the vicinity of the welding torch; and a second shield gas supply device connected upstream of the first shield gas supply device. It is configured.

  Preferably, the shield gas supplied from the first shield gas supply device is a mixed gas of argon gas and carbon dioxide gas, and the shield gas supplied from the second shield gas supply device is carbon dioxide gas. It is characterized by that.

  The welding apparatus of the present invention is an arc welding welding apparatus using a shielding gas, which includes a welding machine, a wire feeding device, a welding torch, and a shielding gas supply device. The shield gas supply device includes a first shield gas supply device connected in the vicinity of the welding torch and a second shield gas supply device connected upstream of the first shield gas supply device. Has been. Therefore, at the start of welding, the shield gas from the first shield gas supply device can be preferentially supplied to the welding torch, and after welding is stable, the shield gas supply from the second shield gas supply device is switched to. be able to.

  If the first shield gas supply device is filled with a suitable shield gas at the start of welding and the second shield gas supply device is filled with a suitable shield gas after welding has been stabilized, it is suitable at the start of welding at the start of welding. The shielding gas can purge the air in the pipe near the welding torch and the remaining gas to eliminate the influence thereof, and after welding is stabilized, welding can be performed with a suitable shielding gas after welding is stabilized.

  The shield gas supplied from the first shield gas supply device is preferably a mixed gas of argon gas and carbon dioxide gas, and the shield gas supplied from the second shield gas supply device is preferably carbon dioxide gas. It is.

  In addition, when switching from the first shield gas supply device to the second shield gas supply device, the supply can be made stable by overlapping the supply from each.

  As described above, according to the present invention, the influence of air and remaining gas in the piping at the start of welding is eliminated, and switching between a shield gas suitable for starting welding and a shield gas suitable for after welding is stably performed. The welding apparatus which was made can be provided.

1 is an overall configuration diagram of a welding apparatus according to an embodiment of the present invention. It is explanatory drawing of the switching method at the time of use of a welding apparatus. It is a whole block diagram of the welding apparatus which concerns on a prior art example.

  Next, with reference to FIG.1 and FIG.2, the welding apparatus which concerns on embodiment of this invention is demonstrated. FIG. 1 is an overall configuration diagram of a welding apparatus 100 according to an embodiment of the present invention. In addition, about the component same as a prior art example, the same code | symbol is attached | subjected and demonstrated.

  The welding apparatus 100 includes a welding machine 1, a wire feeding device 2, a welding torch 3, and a shield gas supply device 4 as main components. Further, the shield gas supply device 4 includes two devices, a shield gas supply device 20 (first shield gas supply device) and a shield gas supply device 30 (second shield gas supply device).

  The welding machine 1 is pipe-connected so that the shield gas is supplied from the shield gas supply device 30 via the connection pipe 7a and the shield gas is supplied to the welding torch 3 via the connection pipe 7b. The welding machine 1 is connected so as to supply a welding current to the welding torch 3 via the power cable 5a and to the workpiece 10 via the power cable 5b. The wire feeding device 2 includes a wire reel 2 a and supplies a welding wire 6 to the welding torch 3.

  The shield gas supply device 20 is a mixed gas cylinder (shield gas supply source) in which a mixed gas of argon gas and carbon dioxide gas having good welding performance is filled at high pressure in order from upstream to downstream (the direction in which the shield gas flows). 21, a connecting pipe 23, a regulator 22, a connecting pipe 25, and an electromagnetic valve 24. The connecting pipe 8 and the adapter 9 connected to the electromagnetic valve 24 are connected to the vicinity of the welding torch 3.

  The shield gas supply device 30 includes a carbon dioxide gas cylinder (shield gas supply source) 31, a connecting pipe 33, a regulator 32, and a connection, which are filled with inexpensive carbon dioxide gas at high pressure in order from upstream to downstream (the direction in which the shield gas flows). It consists of a pipe 35 and an electromagnetic valve 34, and is connected to the welding machine 1 via a connecting pipe 7 a connected to the electromagnetic valve 34.

  As described above, the shield gas supply device 4 includes the first shield gas supply device 20 connected in the vicinity of the welding torch 3 and the second shield connected upstream of the first shield gas supply device 20. And a gas supply device 30. Therefore, the first shield gas supply device 20 is closer to the welding torch 3, and the gas supply to the welding torch 3 can be performed first (preferentially).

  A gas supply amount from the shield gas supply device 20 is set by a regulator 22, and supply start / supply stop is performed by opening and closing the electromagnetic valve 24. Similarly, the gas supply amount from the shield gas supply device 30 is set by the regulator 32, and supply start / supply stop is performed by opening / closing the electromagnetic valve 34. The gas supply from the shield gas supply device 20 and the shield gas supply device 30 can be independently controlled.

  Next, the usage method of the welding apparatus 100 is demonstrated. When welding is performed by the welding apparatus 100, first, the supply amount of mixed gas required at the start of welding is set by the regulator 22, and the supply amount of carbon dioxide gas required after stable welding (at the time of steady welding) is set by the regulator 32, respectively. . FIG. 2 is an explanatory diagram of a switching method when the welding apparatus is used. The upper stage, the middle stage, and the lower stage in FIG.

  First, the electromagnetic valve 24 is opened (the electromagnetic valve 34 is closed), and the mixed gas is supplied from the mixed gas cylinder 21 to the welding torch 3. Next, the welding machine 1 is operated to start supplying the welding current, and the supply of the welding wire 6 from the wire feeding device 2 to the welding torch 3 is started. At this time, after starting the mixed gas supply from the mixed gas cylinder 21, the welding wire is supplied after a predetermined time has elapsed (T1 in FIG. 2). The time T1 is for purging the air existing in the pipe and the carbon dioxide remaining in the pipe at the end of the previous welding with the mixed gas before starting the welding. By providing the time T1, it is possible to purge the air in the pipe and the remaining carbon dioxide gas at the start of welding to eliminate the influence. In particular, since the first shield gas supply device 20 is connected in the vicinity of the welding torch 3, it can be purged in a short time.

  Next, when the welding arc is stabilized after elapse of a predetermined time (T2 in FIG. 2), the electromagnetic valve 34 is opened, and carbon dioxide gas is supplied from the carbon dioxide gas cylinder 31 to the welding torch 3 via the welding machine 1. At this time, the electromagnetic valve 24 is also in an open state, and both the mixed gas and the carbon dioxide gas are supplied (overlap) until a predetermined time elapses (T3 in FIG. 2). Thereby, switching between mixed gas and carbon dioxide gas can be performed stably.

  Next, when the welding arc is stabilized after elapse of a predetermined time (T3 in FIG. 2), the electromagnetic valve 24 is closed, and supply of the mixed gas from the mixed gas cylinder 21 to the welding torch 3 is stopped. Thereafter, only carbon dioxide gas is supplied and welding is performed to the end.

  Switching control for supplying the welding wire, supplying the mixed gas, and supplying the carbon dioxide gas is automatically performed by sequence control. Note that the switching time in the above description is appropriately set depending on the specific configuration of the device, and for example, T1 = 0.6 seconds, T2 = 1.0 seconds, and T3 = 0.6 seconds. be able to.

  In the above description, the case where a mixed gas of carbon dioxide gas and argon gas and a carbon dioxide gas are used as the two types of shielding gas has been described, but the technology of the present invention is applied to a mixed gas other than these, for example, carbon dioxide gas, The same applies to the case where oxygen gas is mixed, carbon monoxide gas is mixed, argon gas and oxygen gas are mixed, or argon gas, helium gas, etc. (inert gas) is used as the shielding gas. is there.

  A welding apparatus 100 according to the present embodiment is an arc welding welding apparatus using a shielding gas, which includes a welding machine 1, a wire feeding device 2, a welding torch 3, and a shielding gas supply device 4. The shield gas supply device 4 includes a first shield gas supply device 20 connected in the vicinity of the welding torch 3 and a second shield gas supply connected upstream of the first shield gas supply device 20. The apparatus 30 is comprised. Therefore, the shield gas from the first shield gas supply device 20 can be preferentially supplied to the welding torch 3 at the start of welding, and after the welding is stabilized, the shield gas from the second shield gas supply device 30 can be supplied. Can switch to supply.

  If the first shield gas supply device 20 is filled with a shield gas suitable for starting welding, and the second shield gas supply device 30 is filled with a suitable shield gas after welding is stabilized, The air in the piping near the welding torch 3 and the remaining gas can be purged with a suitable shielding gas to eliminate the influence thereof, and after welding is stabilized, welding with a suitable shielding gas can be performed after welding is stabilized. .

  The shield gas supplied from the first shield gas supply device 20 is preferably a mixed gas of argon gas and carbon dioxide gas, and the shield gas supplied from the second shield gas supply device 30 is carbon dioxide gas. Is preferred.

  In addition, when switching from the first shield gas supply device 20 to the second shield gas supply device 30, the supply from each overlaps, so that the switching can be performed stably.

  As described above, according to the welding apparatus 100 according to the present embodiment, the influence of the air in the pipe and the remaining gas at the start of welding is eliminated, and the shield gas suitable at the start of welding and the shield gas suitable after the welding is stabilized. Switching can be performed stably.

DESCRIPTION OF SYMBOLS 1 Welding machine 2 Wire feeding apparatus 3 Welding torch 4 Shielding gas supply apparatus 5a Power supply cable 5b Power supply cable 6 Welding wire 7a Connection pipe 7b Connection pipe 8 Connection pipe 9 Adapter 10 Workpiece 20 Shield gas supply apparatus 21 (Gas cylinder)
22 Regulator 23 Connection pipe 24 Solenoid valve 25 Connection pipe 30 Shield gas supply device 31 Shield gas supply source (gas cylinder)
32 Regulator 33 Connection pipe 34 Solenoid valve 35 Connection pipe 40 Shield gas supply device 41a Shield gas supply source (gas cylinder)
41b Shield gas supply source (gas cylinder)
42a regulator 42b regulator 43a connection tube 43b connection tube 44 switching device 44a solenoid valve 44b solenoid valve 45a connection tube 45b connection tube 100 welding device 200 welding device

Claims (2)

A welding apparatus for arc welding using shield gas, having a welder, a wire feeding device, a welding torch, and a shield gas supply device,
The shield gas supply device includes: a first shield gas supply device connected in the vicinity of the welding torch; and a second shield gas supply device connected upstream of the first shield gas supply device. It is comprised, The welding apparatus characterized by the above-mentioned.   The shield gas supplied from the first shield gas supply device is a mixed gas of argon gas and carbon dioxide gas, and the shield gas supplied from the second shield gas supply device is carbon dioxide gas The welding apparatus according to claim 1.

Images