JPH01186277A - Arc welding method - Google Patents

Abstract

PURPOSE:To stabilize welding work by coating heat resistant insulating films on presser fittings parts where an arc is easily generated and limiting width between the coated presser fittings in a specific range. CONSTITUTION:The heat resistant insulating films 9 such as ceramic with abt. 0.1mm thickness are coated on the presser fittings 6 and 6' surface parts where the arc 8 is easily generated. Further, the width between the presser fittings 6 and 6' on which the heat resistant insulating films 9 are coated is made to more than the nozzle diameter of a torch 7 and less than the maximum diameter of the arc 8. By this method, the welding work is stabilized and the bead external appearance is made fine and further, the thermal strain is prevented from being generated.

Description

[Detailed description of the invention] [Industrial application field] In the present invention, the object to be welded is held down with a presser metal fitting.

The present invention relates to an arc welding method for welding objects to be welded by generating an arc between a non-consumable electrode and the objects to be welded.

(Prior art) Generally, when thin steel plates are overlapped or butted together and welded using an arc such as a plasma arc,
rR along the moving direction of the arc as shown in Figure 2.
1 is formed with a backing metal fitting 2 made of, for example, brass.
Fit it into the recess 4 of the table 3 so that it is almost at the same height as the table 3, and place the workpiece 5.5゜ on the backing metal fitting 2 and the table 3 so that the welding point is on the groove l. At the same time, the objects to be welded 5 and 5'' are welded while being placed and held by two presser fittings 6.6'' made of brass, for example, to hold the objects to be welded 5, 5''.

In this case, in order to minimize the thermal influence on the workpiece 5.5', the width a between the presser fittings 6.6' that hold down the workpiece 5, 5' should be made as narrow as possible. This is a condition for obtaining beautiful beads with a burn-free finish.

[Problem that the invention seeks to solve]

However, in this arc welding method, the presser metal 6.6'
When fixing the workpiece 5.5" with The arc 8 is not connected to the object to be welded 5, but is connected to the presser metal fitting 6 or point A of the presser metal fitting 6' as shown in Figure 2.

There is a drawback that the objects to be welded 5 and 5' cannot be welded together.

[Means for solving problems]

In order to eliminate the above-mentioned drawbacks, the present invention provides a 7-way welding method in which the objects to be welded are welded together by generating an arc between the non-consumable electrode and the objects to be welded while holding the objects with a presser metal fitting. In order to prevent the above-mentioned presser metal fittings from forming gaps, a heat-resistant insulating film is coated on at least the part of the presser metal surface where arcs are likely to be formed, and the width between the metal fittings coated with the heat-resistant insulating coating is set using a torch. The present invention provides an arc welding method characterized in that the nozzle diameter is greater than or equal to approximately the maximum diameter of the arc.

[Function] According to this arc welding method, stable welding can be performed even when the torch is brought close to the thickness of the presser metal fitting, making it possible to weld with a thinner arc and in a high temperature range, resulting in a beautiful finish with no burning. You can get a bead of

(Example〕 FIG. 1 is a diagram for explaining one embodiment of the present invention.

As shown in the figure, a portion of the presser metal surface where an arc is likely to be formed, that is, a portion of the presser metal surface near the arc 8, has a height of 1 m, for example, a side surface of the presser metal, and a width of 10 m of the upper surface.
The crane is coated with a ceramic-like heat-resistant insulating wave 119 having a film thickness of about 0.1 mm. Also,
Holder metal fitting coated with heat-resistant insulation coating 9 6.
The workpiece to be welded 5,5° is fixed in a state where the width between the torches 7 and 6" is narrowed to the thickness of the arc ejected from the nozzle of the torch 7. In this state, the torch 7 is held between the metal fittings 6 and 6". Bring it close to the thickness (it is okay to touch it).

The objects to be welded 5 and 5' are welded. In this arc welding method, the width between the presser fittings 6 and 6 is narrowed to within the range from the nozzle diameter of the torch 7 to almost the maximum diameter of the arc,
Moreover, even if the height of the torch approaches the thickness of the holding metal fitting 6.6', the heat-resistant insulated wave I! has a dielectric strength that is at least higher than the torch voltage. 19 electrically insulates between the arc and the presser metal fittings 6.6, so the arc
Good and stable welding results can be obtained.

The arc emitted from the nozzle of the torch 7 becomes thicker as it moves away from the nozzle, and the temperature of the arc also decreases, but in this arc welding method, the torch 7 is brought close to the thickness of the metal fitting 6.6 degrees, so the arc becomes thinner and the temperature of the arc decreases. It is possible to weld in a high temperature range, and it is possible to obtain a beautiful bead with a burn-free finish. In addition, conventionally the presser metal fitting 6.6
Since the width between the arc and the arc had to be wider than the thickness of the arc emitted from the torch, stable welding on the extremely thin workpiece 5.5' of 20 μm to 30 μm required W%. This was not possible because the workpiece 5.5" would rise due to distortion, but with the present invention, the width between the presser fittings 6, 6" is narrowed to the thickness of the arc, and the workpiece 5.5" Since it is now possible to fix the workpiece 5.5゛, it will no longer be lifted up due to thermal distortion, and it will be possible to perform beautiful welding on the workpiece 5.5゛ with no burn marks. Became.

(Effects of the Invention) As described above, the present invention provides an arc welding method for welding objects to be welded by generating an arc between a non-consumable electrode and the objects to be welded while holding the objects with a presser metal fitting.
In order to prevent the formation of arcs on the presser metal fittings, a heat-resistant insulating film is coated on at least the portion of the metal fitting surface where arcs are likely to be formed, and the width between the metal fittings coated with the heat-resistant insulating coating is adjusted to the nozzle of the torch. The present invention, which is an arc welding method characterized in that the diameter is greater than or equal to the approximate maximum diameter of the arc, is less than or equal to the approximate maximum diameter of the arc.

(1) In this arc welding method, even if the width between the presser fittings is narrowed to the thickness of the arc and the height of the torch is brought close to the thickness of the presser metal fittings, the arc will not be connected to the presser metal fittings, resulting in stable welding. Welding results are obtained.

(2) The arc emitted from the torch nozzle becomes thicker and the temperature of the arc decreases as it moves away from the nozzle. However, with this arc welding method, the torch can be brought close to the thickness of the metal fitting, resulting in a thinner arc and a higher temperature. It becomes possible to weld in this area.

You can get a beautiful bead with no burnt finish.

(3) Previously, the width between the presser metal fittings had to be wider than the thickness of the arc coming out of the torch, so
To perform stable welding on workpieces with extremely thin plate thicknesses of m to 30μm, it is necessary to perform stable welding on workpieces with a thickness of 5.5μm due to M strain.
3. This was impossible because the angle would rise, but with the present invention, it is now possible to fix the workpiece while narrowing the width between the presser fittings to the thickness of the arc. The object to be welded no longer lifts up, and it is now possible to perform beautiful welding with no burn marks on the object.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining one embodiment of the present invention. FIG. 2 is a diagram for explaining a conventional arc welding method. ■... Skin 2... Backing metal fitting 3... Base 4... Concavity 5.5゛... Work to be welded 6.6°... Holding metal fitting 7... Torch 8... Arc 9...Heat-resistant insulation coating patent applicant Origin Electric Co., Ltd.

Claims (1)

[Claims] In the arc welding method, in which the objects to be welded are welded together by generating an arc between a non-consumable electrode and the object while holding the object with a presser, the surface of the presser is A heat-resistant insulating film is coated on at least a portion where an arc is likely to be formed, and the width between the presser fittings coated with the heat-resistant insulating film is set to be greater than or equal to the nozzle diameter of the torch and less than or equal to the approximate maximum diameter of the arc. arc welding method.