JPS63256277A - Gas shielded arc welding equipment - Google Patents

Abstract

PURPOSE:To reduce weld defects due to the defective shielding by providing a means to output the undermentioned fact when an actual condition value of shielding gas exceeds a reference condition value to change a nozzle automatically based on the output. CONSTITUTION:The reference condition value of the shielding gas is set in a setting means 14 so as to attain a proper gas shielded condition during welding. The actual condition value of the shielding gas flowing out from a welding torch 9 is detected by a detection means 13. With a judgement means 15, it is judged whether or not the actual condition value exceeds the reference condition value and in case the actual condition value exceeds the reference condition value, an output means 17 outputs the fact. This output is utilized to carry out the automatic change of the torch nozzle or the display to the fact, etc. The pressure or flow rate are used as the condition value of the shielding gas.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a gas shielded arc welding device.

(Prior art) Shielding gas is flowed out from the nozzle of a welding torch, and this shielding gas shields the metal arc and molten pool from the surrounding air, thereby preventing oxidation, nitridation, etc. of the molten metal. Gas-shielded arc welding equipment that prevents welding defects such as blowholes from impairing the performance of welded parts has been well known.

(Problems to be Solved by the Invention) By the way, in the above gas shielded arc welding device,
During welding, spatter may adhere to the vicinity of the inner periphery on the tip side of the gas nozzle through which the shielding gas flows out. The amount of such spatter gradually increases as the arc time increases, and as a result, the flow path of the shielding gas is disturbed at the tip of the gas nozzle. As a result, the state of the shielding gas flowing out from the welding torch changes, the shielding state of the metal arc and molten pool deteriorates, oxygen, nitrogen, etc. enter from the surrounding air, and the molten metal oxidizes, nitrides, etc. However, there is a problem in that welding defects such as blowholes occur.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and its purpose is to be able to automatically output changes in the state of outflow of shielding gas from a welding torch; An object of the present invention is to provide a gas-shielded arc welding device that is capable of automatically replacing nozzles based on signals.

(Means for Solving the Problems) Therefore, the gas shielded arc welding device of the present invention has a first
As shown in the figure, a setting means for setting a reference state value of the shielding gas flowing out from the welding torch, a detection means for detecting the actual state value of the shielding gas, and the setting means and the detection means. determining means for determining whether the actual state value exceeds the reference state value based on respective signals from the; and output means for outputting that the actual state value exceeds the reference state value. It has

(Function) In the gas shielded arc welding apparatus having the above configuration, when the state of the shielding gas flowing out from the welding torch changes due to adhesion of spatter, etc., the state value of the shielding gas flowing out from the welding torch, For example, by paying attention to the fact that the flow rate, pressure, etc. fluctuate, first, a standard state value of the shielding gas is set in advance so as to realize an appropriate gas shielding state during welding. On the other hand, as the arc time increases, the actual state value of the shielding gas is detected as appropriate. Then, it is determined whether or not this actual state value exceeds the reference state value, and if the actual state value exceeds the reference state value, an output to that effect is output. Therefore, using this output, automatic torch replacement,
It becomes possible to automatically replace the nozzle or display a message to that effect.

(Example) Next, a specific example of the gas shielded arc welding apparatus of the present invention will be described in detail with reference to the drawings.

FIGS. 2 and 3 show an embodiment of the present invention. In FIG. 2, 1 is a control section, to which a gas cylinder 2 is connected via a hose 3,
A wire 5 wound around a reel 4 is introduced, and one pole of a welding power source 6 is connected by a wire 7a. This control section 1 is connected to a welding torch 9 via a conduit cable 8. This conduit cable 8 is internally equipped with a flow path for shielding gas, a wire liner, and a power supply conductor.
The wire 5 from the welding torch 9 and the current from the welding power source 6 can be supplied to the welding torch 9 via the conduit cable 8. Note that lO is a base metal, and the other pole of the welding power source 6 is connected to this base metal 10 by a wiring 7b. Further, 11 is a gas nozzle, and the shielding gas sent to the welding torch 9 is passed through this gas nozzle 1.
It will be leaked through 1. On the other hand, a flow rate adjustment section 12 is connected to the hose 3 extending from the gas cylinder 2. The flow rate of the shielding gas supplied from the gas cylinder 2 to the welding torch 9 is adjusted by the adjustment section 12. Further, the shielding gas flow path in the welding torch 9 is connected to a pressure detection section 13, and this pressure detection section 13
It is designed to detect the pressure of shielding gas.

Various conventionally known pressure sensors can be used to detect the second pressure. On the other hand, 14 is a reference pressure setting section, which sets the pressure in the shielding gas flow path of the welding torch 9, that is, the reference pressure, so as to realize an appropriate gas shielding state during welding. Note that this setting method will be described later. The setting signal from the reference pressure setting section 14 and the detection signal from the pressure detecting section 13 are output to the determining section 15. Here, it is determined whether the pressure of the shielding gas detected by the pressure detection section 13 has fluctuated with respect to the reference pressure based on each of the above-mentioned signals. In this embodiment, the determining section 15 is configured by a microcomputer. The judgment signal from the judgment section 15 is outputted to the display section 16 from the output -17.

The display section 16 is composed of, for example, a light emitting diode, and displays by, for example, a blinking operation thereof.

Next, the operating state of the gas shielded arc welding device is
The explanation will be given based on the flowchart shown in the figure. First, a new gas nozzle 11? It is attached to the capacitive torch 9, and the gas flow rate of the shielding gas is adjusted in the flow rate adjustment section 12 (see FIG. 2) (step Sl). This adjustment is made so that the flow rate of the shielding gas flowing out from the gas nozzle 11 of the welding torch 9 becomes such that it can optimally shield the molten pool and the like. When the flow rate of the shielding gas is determined (step S2), the gas pressure PO at that time is measured in the shielding gas flow path within the welding torch 9 (step S3). As described above, this pressure measurement can be performed by the pressure detection section 13 (see FIG. 2). Next, this pressure PO is set as a reference pressure in the reference pressure setting section 14, and is read into the judgment section 15 (step S4). With the above steps, the work of setting the reference pressure is completed.

Note that since the pressure and the like may vary depending on the surrounding environment, etc., it is preferable that each of the above steps be performed appropriately at the welding site as well. Thereafter, this gas-shielded arc welding apparatus is used for welding work (step S6), and when a predetermined arc time has elapsed, the welding work is interrupted. First, the shielding gas at the flow rate initially adjusted by the flow rate adjustment valve 12 is supplied to the welding torch 9 (step S6). The gas pressure P1 at that time is detected by the pressure detection section 13, and this pressure P1 is read into the judgment section 15 (step S7), and in step S8, this gas pressure pt is compared with the reference pressure PO.

At this time, if Pi>(PO+ΔP), it is determined that spatter has adhered to the gas nozzle 11, and a nozzle replacement indication is made, for example, by a light-emitting diode extinguishing operation (step S9). Then, it is determined whether the gas nozzle 11 has been replaced (step 5IO), and if the gas nozzle 11 has not been replaced, the light emitting diode continues blinking, and if it has been replaced, the process moves to step S5 by operating a reset button or the like. Gas shielded arc welding equipment is used for welding work. On the other hand, if Pl is within the range of PO±ΔP in step S8, the process moves to step S5, and the gas shielded arc welding apparatus continues to be used for welding work. Further, if PI<(PO-ΔP), it is determined that there is little shielding gas remaining in the gas cylinder 2, and an indication to replace the gas cylinder is made, for example, by a blinking operation of a light emitting diode other than the above (step 5ll). When the gas cylinder 2 has not been replaced, the light emitting diode continues blinking, and when it has been replaced, the process moves to step S5 by operating a reset button or the like, and welding work is started. In the above steps, step S4,
The reference pressure PO and gas pressure P1 are each read into the microcomputer in S7, and step S8 is processed according to the program.

As described above, in the above embodiment, when the gas pressure Pi of the shielding gas flowing out from the welding torch 9 becomes larger than the set pressure value PO by a certain value ΔP, spatter adheres to the gas nozzle 11. When it is determined that the nozzle replacement is required and the gas pressure P1 of the shielding gas becomes smaller than the set pressure value PO by a certain value ΔP, it is determined that the remaining amount of gas in the gas cylinder 2 is small, Since the display is configured to display the gas cylinder replacement, it is possible to display a change in the state of the shielding gas flowing out from the welding torch 9 in the above manner. Therefore, it is possible to take measures such as replacing the gas nozzle 11, replacing the gas cylinder 2, etc. to prevent the problem of welding defects occurring in the weld metal due to insufficient shielding of the metal arc or molten pool.

Although specific embodiments of the gas shielded arc welding apparatus of the present invention have been described above, the present invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of the invention. For example, as shown in FIG. 4, the configuration may be such that the flow rate is used instead of the pressure as the state value of the shielding gas. In that case, a pressure adjustment section 12a is used instead of the flow rate adjustment section 12, a flow rate detection section 13a is used instead of the pressure detection section 13, and a reference flow rate setting section 14a is used instead of the reference pressure setting section 14. The unit 15, the output unit 17, and the display unit 16 are employed and configured in the same manner. In that case, after a predetermined arc time has elapsed, the pressure of the shielding gas is adjusted to the pressure at the time of setting the standard flow rate in the pressure adjustment part 12a, and when the flow IQI of the shielding gas becomes smaller than the standard flow rate QO, the gas nozzle 11 What is necessary is to determine that spatter has adhered to the surface and display the message. Further, in the above embodiment, the pressure range in which the pressure value PO has a predetermined width ΔP is set as the reference state value, but the value of the pressure value PO or the flow rate itself may not be used as the reference state value. It's okay. Furthermore, in the embodiment described above, the display unit 16 is configured to display that spatter has adhered, but based on the output from the output unit 17, the welding equipment itself can be automatically stopped, the welding torch 9 and the nozzle 11 It is also possible to perform automatic exchange.

(Effects of the Invention) As described above, the gas shielded arc welding apparatus of the present invention is configured to output that the actual state value of the shielding gas flowing out from the welding torch exceeds the reference state value, Therefore, by using this output signal, spatter etc. may adhere and good welding cannot be performed (
It is possible to display a message indicating that the welding torch and nozzle have changed automatically, and to automatically replace the welding torch and nozzle. Therefore, welding defects caused by poor shielding can be reduced more than in the past.

[Brief explanation of drawings]

, Fig. 1 is a diagram corresponding to the claims of the gas shielded arc welding apparatus of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is a flowchart diagram explaining its operating state, and Fig. 4 is a diagram corresponding to the claims of the gas shielded arc welding apparatus of the present invention. FIG. 3 is a block diagram of another embodiment of the invention. 9... Welding torch, 13... Pressure detection section (detection means), 14... Reference pressure setting section (setting means), 15...
- Judgment section (judgment means), 17... Output section (output means)
, 13a...flow rate detection section (detection means), 14
a...Reference flow rate setting section (setting means). Patent applicant: Nippon Binzel Co., Ltd. Agent: Masahiro Nishimori, ′!
7.1i i'1 1 hand 1 ramie 1- Figure 1

Claims (1)

[Claims] 1. A setting means for setting a reference state value of the shielding gas flowing out from the welding torch, a detection means for detecting the actual state value of the shielding gas, and each of the settings from the setting means and the detection means. The apparatus further comprises a determining means for determining whether the actual state value exceeds the reference state value based on a signal, and an output means for outputting that the actual state value exceeds the reference state value. A gas shielded arc welding device featuring: