JPH0539765U - Arc welding equipment - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a device that illuminates a welding spot before an arc occurs, and automatically turns off the arc when it occurs so as to accurately align the arc welding spot. [Structure] A holder, a power supply unit, and an aiming illumination unit are provided in the holder. The aiming illumination unit can be turned on / off by a switch and automatically turned off even when an arc occurs.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an arc welding device used for arc welding a steel structure.

[0002]

[Prior Art]

 In general, this type of arc welding apparatus is composed of a welding rod 1 and a power source section 3 which are held by a welding torch or holder, as shown in FIG. Then, for welding, the welding rod 1 is connected to the electrode A of the power supply unit 3, the base material 2 is connected to the electrode B, and the voltage is applied between both electrodes while maintaining an appropriate interval. An arc is generated due to a discharge phenomenon caused by an electric current flowing through the space between them, and the temperature of heat generated from the arc is about 4000 to 5000 ° C.

That is, the welding rod 1 that is a consumable electrode that is melted by the heat of the arc and the base material 2 to be welded are melted, and the base materials 2 are joined together.

The base material 2 is made of steel and is a part of a steel structure to be arc-welded. Depending on the plate thickness, a thin plate structure, a medium plate structure, a medium thick plate structure, or a thin pipe structure may be used. , Medium-thickness, thick-walled, etc., and the welding standard differs depending on the structure.

The power supply unit 3 can select appropriate working conditions such as welding current, arc voltage, welding speed, and gas flow rate according to the welding method, steel type and plate thickness, and working environment. Can be roughly classified into DC arc welding or AC arc welding, and designed to be suitable for welding work by allowing high current (100 to 100 A) to flow at low voltage (20 to 40 V). Has been done. Such an arc welding device needs to protect the eyes of the welder from the intense light when an arc occurs. Therefore, when welding, the welding position of the base material 2 such as a steel material is confirmed through the light-shielding glass 14 and the welding is performed.

[0006]

[Problems to be solved by the device]

 However, the light-shielding glass that protects the welder's eyes from the light rays generated by the arc is in a dark state even when the intended weld is seen through the light-shielding glass when the arc is not generated.

[0007] Therefore, since the place where the steel material is welded is determined and operated based on the experience and intuition of the welder, a welding defect at the welding start point (hereinafter, referred to as a start point defect) is caused, or the base metal is unnecessary. The arc was scattered (hereinafter referred to as arc strike) outside the welded part. In some cases, such welds with starting point defects may have weld defects exceeding the allowable limit, which impairs the structural yield strength. Weld defects must be repaired by scraping and re-welding, or necessary measures such as replacing the base metal must be taken.

For example, welding defects that can be prevented by confirming the welding position in advance and performing arc welding include surface irregularities, overlaps, cracks, poor fusion, and poor penetration.

[0009] There is a problem in that it has a large effect on the time wasted in testing and inspection for preventing such welding defects and on the progress of construction work such as buildings.

Therefore, the above-mentioned conventional example has a problem that it is necessary to solve the problem so that the experience and intuition of the welder can be maximized, and at the same time, the starting end defect can be prevented.

[0011]

[Means for Solving the Problems]

 As a concrete means for solving the problems of the conventional example, the present invention is an arc welding apparatus composed of a holder for detachably sandwiching a welding torch or a welding rod and a power source section, and illuminating a welding position. The arc welding apparatus is characterized by having an aiming illumination unit. The aiming illumination unit can be turned on / off by a switch and is turned off when an arc occurs.

[0012]

[Action]

 Since the aiming illumination unit that illuminates the welding position is provided, it is possible to confirm the welding position in advance through the light-shielding glass and the position of the base metal to be welded to the tip of the welding rod. In addition, the aiming lighting unit can be turned on / off by a switch, and can be turned off by the occurrence of an arc, which shortens the illumination time, and the tip of the welding rod and the base metal after the arc has occurred. The appropriate positional relationship can be maintained as in the conventional case without being obstructed by the lighting at the distance.

[0013]

【Example】

 Next, the first embodiment of the present invention will be described in more detail with reference to FIGS. 1 and 2 and the second embodiment with reference to FIG. The same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. The arc welding apparatus according to the first embodiment is configured to include a welding torch 9, a power supply unit 3, and a sighting illumination unit 10 that illuminates a welding position.

Although not shown in the figure, the welding torch 9 is used for arc welding using a consumable electrode wire, and includes a sighting illumination unit 10, a torch switch 11 for generating an arc, and a sighting illumination. A lighting switch 12 for turning on / off the unit is attached, and the rear end side is connected to the power supply unit 3.

The aiming illumination unit 10 is for illuminating and positioning the welding position in advance during arc welding, and is not affected by the heat of the arc from the nozzle portion of the welding torch 9 and the influence of the spatter by the arc. This structure is provided at an appropriate position on the torch 9.

Here, since the light-shielding glass 13 has a degree according to the light amount of the light beam generated from the arc, when the object is viewed through the light-shielding glass 14 before the arc is generated, it is almost dark. is there. Therefore, the amount of light generated from the aiming illumination unit 10 may be such that the tip portion of the welding torch 9 and the welded portion can be confirmed through the light shielding glass 14. For example, to confirm the proper position, it is sufficient to generate a strobe beam for several seconds and illuminate it. Therefore, the light amount of the aiming illumination unit 10 is a structure that can be freely adjusted according to the working environment such as a construction site.

The torch switch 11 is a switch for generating an arc provided at a position for supporting the welding torch 9. The illumination switch 12 is a switch for illuminating the arc through the light-shielding glass 14 in the direction of arc generation from the welding torch 9 before arc generation. Then, the illumination switch 12 has a structure in which, when an arc is generated, a light ray caused by the arc is detected and automatically turned off. The structure for automatically turning off the light may detect electrical changes such as changes in current caused by the arc.

Next, the arc welding apparatus according to the second embodiment is an arc welding apparatus for manual welding as shown in FIG. 3, and includes a holder 9 a for removably sandwiching the welding rod 1 and a power source section 3. And the aiming illumination unit 10.

Except that the holder 9a that detachably holds the welding rod 1 is different from the welding torch 9 described in the first embodiment, the location of the aiming illumination unit 10 is the same, and the description thereof is omitted.

[0020]

[Effect of the present invention]

 As described above, the arc welding apparatus according to the present invention is provided with the aiming illumination part for illuminating and positioning the welding position in advance during arc welding, by providing the welding torch or the holder at an appropriate position. In addition to the welding based on the experience and intuition, the positional relationship between the tip of the welding rod and the weld can be confirmed through the light-shielding glass before welding. As a result, the time spent for testing and inspection can be greatly reduced, and the progress of construction work made of steel structures can be accelerated. Also, since it is possible to confirm the appropriateness of the welded part before the arc occurs, it is possible to reduce the arc strike.

[Brief description of drawings]

FIG. 1 is a schematic view of irradiating a welding part with a light beam from an aiming illumination unit before welding according to an embodiment of the present invention.

FIG. 2 is a schematic view in which the welding portion according to the embodiment of the present invention is illuminated and the welding is performed after confirming an appropriate position.

FIG. 3 is a schematic view of irradiating the welding part with a light beam from the aiming illumination part before welding according to the second embodiment of the present invention.

FIG. 4 is a schematic view of welding in a conventional example.

[Explanation of symbols]

 1 Welding Rod 2 Base Material 3 Power Supply Section 4 Arc 9 Welding Torch 9a Holder 10 Aiming Illumination Section 11 Torch Switch 12 Lighting Switch 13 Light-shielding Mask 14 Light-shielding Glass

Claims (2)

[Scope of utility model registration request] 1. An arc welding apparatus comprising a holder for removably sandwiching a welding torch or a welding rod and a power source section, comprising an aiming illumination section for illuminating a welding position. Arc welding equipment. 2. The aiming illumination unit is turned on / off by a switch.
The arc welding device according to claim 1, wherein the arc welding device can be turned off and is turned off when an arc is generated.