JPH0494874A - Torch cooling system welding equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water-cooled torch welding device in which a welding torch is cooled by cooling water.

Conventional technology In conventional torch water-cooled welding equipment, no special consideration is given to the difference between the air temperature around the equipment and the cooling water temperature, and the difference between the shielding gas temperature and the cooling water temperature, and no processing is done regarding temperature. Cooling water was being circulated to the welding torch.

Problems to be Solved by the Invention In general, water-cooled welding torches have a structure in which cooling water circulates to the vicinity of the gas nozzle at the tip of the torch, and the cooling water hose is connected to a shield gas hose, a control cable, and a welding cable. The hoses and cables are bundled together and routed through a leather tube to protect them from welding spatter and UV rays, as well as the grit from the welding torch.

Inside, cables, hoses, connection fittings, and torch switches are intricately assembled.

If the temperature of the cooling water circulated through such a torch is lower than the surrounding air temperature, the outer surface of the cooling water hose, the connection fitting between the cooling water hose and the torch body, and even the gas nozzle
There was a problem that dew condensation formed on the metal parts, corroding metal parts, and degrading electrical insulation.

Additionally, if the temperature of the cooling water circulated through the torch is lower than the temperature of the shielding gas supplied to the torch, the cooling water path and the shielding gas path are in contact with each other, especially at the tip of the torch, so welding may not start. 6. Before welding or during a welding pause, dew condensation occurs on the inner surface of the shielding gas path near the torch tip, including the inner surface of the gas nozzle, and the shielding gas, which has a temperature higher than the water temperature, contains a large amount of moisture in the gas path caused by condensation. Since it is fed to the welding part by
There was a problem in that it impairs the shielding effect and generates plowholes, which can cause welding defects.

The present invention provides a water-cooled torch with high reliability and good shielding properties that does not cause dew condensation on or near the welding torch even if there is a difference between the cooling water temperature and the ambient air temperature, or between the cooling water temperature and the shielding gas temperature. The purpose is to provide welding equipment.

Means for Solving the Problems In order to achieve the above object, the first means is a water temperature measuring device that measures the temperature of the cooling water supplied to the welding torch using a water temperature measuring element and outputs the water temperature as a water temperature value signal, and an ambient temperature measuring device. an ambient temperature measuring device that measures the ambient air temperature using an element and outputs the air temperature as an air temperature value signal; and a six-beam device that receives the water temperature value signal and the air temperature value signal as input and outputs a heating signal when the water temperature is lower than the air temperature. The welding torch is equipped with one computing unit and a heater that heats cooling water for cooling the welding torch when the heating signal is input.

The second means measures the temperature of the shielding gas using a gas temperature measuring element instead of the means for converting the ambient temperature into a temperature value signal in the first means, and outputs the temperature of the shielding gas as a gas temperature value signal. It comprises a gas temperature measuring device, and a second computing unit replacing the first computing unit that receives the gas temperature value signal and the air temperature value signal as input and outputs a heating signal when the water temperature is lower than the gas temperature. , the other configurations are the same as the first means.

The third means is the first means plus a means for converting the gas temperature in the second means into a gas temperature value signal and a second arithmetic unit, so that the water temperature is at least one of the ambient air temperature or the gas temperature. The configuration is such that a heating signal is input to the heater when the temperature is lower than that of the current temperature.

The fourth means is that in any of the first to third means, the difference between the water temperature and the ambient air temperature and/or the difference between the water temperature and the gas temperature is equal to or less than a preset value ΔT ℃ by 7 degrees. In this case, the configuration is such that the cooling water for cooling the welding torch is not heated.

According to the first means, since there is no difference between the temperature of the welding torch cooling water and the ambient temperature, condensation that corrodes the metal parts of the welding torch and deteriorates the electrical insulation does not occur, and the second method According to this method, since there is no difference between the temperature of the welding torch cooling water and the temperature of the shielding gas, dew condensation does not occur on the inner surface of the gas path near the torch tip, including the inner surface of the gas nozzle, and moisture gets mixed into the shielding gas and the shielding There is no loss of effectiveness, and therefore no welding defects occur.

According to the third means, at least one of the ambient air temperature and the shielding gas temperature is higher than the temperature of the welding torch cooling water, and at least the other one is equal to the temperature of the welding torch cooling water, so that the metal part is not heated. At the same time, condensation that corrodes and deteriorates electrical insulation does not occur, and at the same time, condensation does not occur on the inner surface of the gas path near the torch tip, including the inner surface of the gas nozzle, and moisture does not enter the shielding gas and impair the shielding effect. Therefore, welding defects will not occur.

Furthermore, according to the fourth means, since no condensation occurs when the difference between the water temperature and the air temperature and between the water temperature and the gas salt is small, the cooling water is not heated while the temperature difference is small, resulting in an energy saving effect. .

Example Examples will be described below with reference to the drawings.

FIG. 1 shows the first embodiment, where 1 is a welding power source, 2 is a cooling water source, 3 is a shielding gas source, 4 is a water temperature measuring device, 4 & is a water temperature measuring element, 6 is an ambient temperature measuring device, and 51L is a water temperature measuring device. An ambient temperature measuring element, 7 a first computing unit, 9 a torch cooling water heater, 13 a welding torch, and 14 an object to be welded.

In the configuration shown in FIG. 1, the temperature of the cooling water for cooling the torch is detected by the water temperature measuring element 4a, and the water temperature measuring device 4 converts the cooling water temperature into a water temperature value signal T1, which is input to the first computing unit 7. On the other hand, the ambient temperature is measured by nine vanes in the ambient temperature measuring element 5a, and the ambient temperature is converted into a temperature value signal of 2 by the ambient temperature measuring device 5 and inputted to the first computing unit 7. The first computing unit 7 receives two input water temperature value signals T1.
and the temperature value signal T2, and when the temperature value signal T2 is larger, the heating signal S1 is output, and the heating signal S1 is input to the heater 9 to heat the torch cooling water (outward path) Wl.

FIG. 2 shows a second embodiment. In FIG. 2, the same parts as in FIG. 1 are given the same numbers and detailed explanations are omitted, and different parts will be explained below.

In the second embodiment, the ambient temperature measuring element 5 in FIG.
A gas temperature measuring element 61L is provided in place of 1L, a gas temperature measuring device 6 is provided in place of the ambient temperature measuring device 50, and a second computing device 8 is provided in place of the first computing device 70. The gas temperature measuring element is directly attached to the gas path to measure the gas temperature, and the gas temperature measuring device 6 converts the gas temperature into a gas temperature value signal of 3 and inputs it to the second computing unit 8. This second computing unit 8 compares two inputs, that is, the water temperature value signal T1 and the gas temperature value signal T3, and when the gas temperature value signal T3 is larger than 10ba-7, the heating signal S2 is outputted, and the heating signal S2 is output. The signal S2 is input to the heater 9 to heat the torch cooling water (outward path) Wl.

FIG. 3 shows a third embodiment. In FIG. 3, the same parts as in FIGS. 1 and 2 are given the same reference numerals, detailed explanations are omitted, and different parts and different configurations will be explained.

In the third embodiment, a gas temperature measuring element 6a used in the second embodiment and a gas temperature measuring device 6 are added to the configuration shown in FIG.
, a second arithmetic unit 8 is added, and an OR element 10 is further added.

In FIG. 3, the air temperature value signal T2 and the water temperature value signal T1 are the first
When the temperature value signal T2 is larger than the temperature value signal T2, the heating signal S1 is outputted.

On the other hand, the second computing unit 8 compares the gas temperature value signal T3 and the water temperature side signal to be 1, and when the gas temperature value signal T3 is larger, the heating signal S2 is output. The heating signals S1 and 82 are connected to be input to the OR element 1o, and when either heating signal S1 or 82 is input to the OR element 10, the heating signal is input from the OR element 116 to the OR element 10. The signal SO is output, and the heating signal So is input to the heater 9 to heat the torch cooling water (outward path) Wl.

Figure 4 is a diagram explaining the functions added to each of the above embodiments. Since condensation does not occur when the difference between water temperature and air temperature and between water temperature and gas temperature is small, the difference between water temperature and air temperature and water temperature and gas temperature If the difference is 31° C. or less, the torch cooling water is not heated.

In FIG. 4, the same parts as those in FIGS. 1 to 3 are given the same numbers and detailed explanations are omitted, and different parts and structures will be explained.

In FIG. 4, numeral 11 is a subtracter for determining the difference between the temperature value signals T2, and 12 is a ΔT generator for generating an electrical value signal ΔT corresponding to the temperature difference ΔT°C. The difference signal (T2-
T1) and ΔT times the signal are input to the first arithmetic unit 7, and when the difference signal (T2-TI) is greater than ΔT, the first arithmetic unit 7
outputs a heating signal S1. That is, when the water temperature is lower than the ambient air temperature and the difference therebetween exceeds ΔT''C, a heating signal is output, and the torch cooling water is heated.

The circuit that detects that the difference between air temperature and water temperature exceeds ΔT °C and outputs a heating signal has been described above with reference to FIG. 4. The ambient temperature measuring element 51L of FIG. If the ambient temperature measuring device 6 is replaced with the gas temperature measuring device 6 and the first computing device 7 is replaced with the second computing device 8 in the element 61L, when the difference between the gas temperature and the water temperature exceeds 37°C. A circuit that outputs a heating signal can be realized.

Effects of the Invention As is clear from the above explanation, in the present invention, by heating the welding torch cooling water when the temperature of the welding torch cooling water is lower than the ambient temperature, the temperature difference between the two is eliminated.
Condensation that corrodes the metal parts of the welding torch and deteriorates the electrical insulation is eliminated, maintaining the reliability and safety of the welding equipment, and also when the welding torch cooling water temperature is lower than the shielding gas temperature. By heating the cooling water for the welding torch at 13-degrees, the temperature difference between the two is eliminated, and dew condensation does not occur on the inner surface of the gas path near the torch tip, including the inner surface of the gas nozzle, and moisture gets mixed into the shielding gas and the shielding The effect is not impaired, therefore welding defects are not caused, and welding quality can be improved.

Furthermore, if the temperature of the welding torch cooling water is lower than either the ambient air temperature or the shielding gas temperature, if the welding torch cooling water is heated, the temperature of the welding torch cooling water will be lower than the ambient air temperature or the shielding gas temperature. The temperature will be the same as the higher of the two, preventing any condensation, increasing the reliability and safety of the welding equipment, and at the same time improving the quality of welding.

In addition, if you stop heating the welding torch cooling water at a temperature lower than the ambient air temperature and shielding gas temperature so that no condensation occurs, you can save energy without sacrificing the above effects. I can do it.

[Brief explanation of drawings]

147, -7 Figure 1 is a block diagram showing the configuration of the first embodiment, Figures 2 and 3 are block diagrams each showing the configuration of other embodiments, and Figure 4 is an addition to each of the above implementations. FIG. 2 is a partial block diagram showing the principle of the function. 4...Water temperature measuring device, 41L...Water temperature measuring element, 5...Ambient temperature measuring device, 6a...
...Ambient temperature measuring element, 6...Gas temperature measuring device, 61L...Gas temperature measuring element, 7,8...
...Arithmetic unit, 9...Heater, 13...
・Welding torch.

Claims (4)

[Claims] (1) A water temperature measuring device that uses a water temperature measuring element to measure the temperature of the cooling water that cools the welding torch and outputs the water temperature as a water temperature value signal, and an ambient temperature measuring element that measures the surrounding air temperature and outputs the water temperature as an air temperature value signal. an ambient temperature measuring device that outputs as
a calculator that receives the water temperature value signal and the air temperature value signal, compares both signals, and outputs a heating signal when the water temperature is lower than the air temperature; and a cooling device that cools the welding torch when the heating signal is input. A torch water-cooled welding device characterized by being equipped with a heater that heats water. (2) A water temperature measuring device that measures the temperature of the cooling water that cools the welding torch with a water temperature measuring element and outputs the water temperature as a water temperature value signal, and a water temperature measuring device that measures the temperature of the shielding gas with a gas temperature measuring element and measures the temperature of the shielding gas. a gas temperature measuring device that outputs the water temperature value signal as a gas temperature value signal, and a computing device that receives the water temperature value signal and the gas temperature value signal as input, compares both signals, and outputs a heating signal when the water temperature is lower than the gas temperature. and a heater that heats cooling water for cooling the welding torch when the heating signal is input. (3) A water temperature measuring device that uses a water temperature measuring element to measure the temperature of the cooling water that cools the welding torch and outputs the water temperature as a water temperature value signal, and an ambient temperature measuring element that measures the surrounding air temperature and outputs the water temperature as an air temperature value signal. an ambient temperature measuring device that outputs as
The temperature of the shielding gas is measured by the gas temperature measuring element,
A gas temperature measuring device that outputs the temperature of the shielding gas as a gas temperature value signal, and the water temperature value signal and the air temperature value signal are input, the two signals are compared, and a heating signal is output when the water temperature is lower than the air temperature. a first computing unit; a second computing unit that receives the water temperature value signal and the gas temperature value signal as input, compares both signals, and outputs a heating signal when the water temperature is lower than the gas temperature; 1 and a heater for heating cooling water for cooling a welding torch when a heating signal from at least one of the first and second computing units is input. . (4) Claims 1 to 3 in which the cooling water for cooling the welding torch is not heated when the difference between the air temperature and the water temperature and/or the difference between the air temperature and the gas temperature is less than a preset value ΔT°C. The torch water-cooled welding device according to any one of the above.