JPH0663754A - Gas shielded arc welding method - Google Patents

Abstract

PURPOSE:To increase the quantity of deposition without increasing heat input, especially and to facilitate the cooling and the solidification of a molten pool. CONSTITUTION:In the gas shielded arc welding method, the tip of a filler wire 19 which is not energized is inserted into the molten pool 17 formed on the surface of base metal 12 by an electrode wire 15. Since the filler wire 19 in addition to the primary electrode wire 15 are molten by the heat of an arc 16 and the heat of the molten pool 17 in the molten pool 17, the quantity of deposition can be increased even without increasing the heat input, especially. In addition, since the filler wire 19 absorbs the heat of the molten pool 17 at the time of melting, the cooling and the solidification of the molten pool 17 are facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding electrode type gas shield arc welding method such as a MIG welding method and a MAG welding method.

[0002]

2. Description of the Related Art In the conventional gas shielded arc welding method of this type, as shown in FIG. 2, a current is passed through a conducting tip 4 in an atmosphere of a shield gas 3 sprayed from a shield nozzle 1 onto a surface of a base material 2. The electrode wire 5 is automatically fed and the electrode wire 5 is energized to generate an arc 6 between the electrode wire 5 and the base material 2, and the heat of the arc 6 causes the electrode wire 5 and the base material 2 to Was melted to form a molten pool 7 on the surface of the base material 2, and the molten pool 7 was cooled and solidified to form a weld bead 8 and the base material 2 was welded.

[0003]

However, according to the above-mentioned conventional welding method, when the current value and the voltage value to the electrode wire 5 are determined, the physical state of the arc 6 is determined, and the heat input to the molten pool 7 is The melting amount of the base material 2 and the melting rate of the electrode wire 5 are almost determined. Therefore, if you want to accelerate the solidification with a large current, such as when you want to prevent the molten metal from dripping in welding in the upright or upright position, or increase the amount of welding without increasing the heat input at the normal current value. In some cases, there is a problem that the conventional welding method cannot meet these requirements.

An object of the present invention is to improve the conventional welding method and solve the above problems.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is a gas shielded arc welding method in which the tip end portion of a filler wire that does not conduct electricity in the molten pool formed by the electrode wire on the surface of the base material. Is configured to be inserted.

[0006]

In the welding method of the above construction, in addition to the original melting of the electrode wire, the tip of the filler wire is melted by the heat of the arc and the heat retained by the molten pool. Therefore, the welding amount can be increased without increasing the heat input. Further, since the filler wire takes away the heat held by the molten pool as the heat of fusion during melting, the molten pool is cooled and solidification is promoted.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the present embodiment, as shown in FIG. 1, in the atmosphere of the shield gas 13 sprayed from the shield nozzle 11 onto the surface of the base material 12, the original electrode wire 15 is passed through the current-carrying tip 14.
Is automatically fed and the electrode wire 15 is energized,
An arc 16 is generated between the electrode wire 15 and the base material 12, and the heat of the arc 16 melts the electrode wire 15 and the base material 12 to form a molten pool 17 on the surface of the base material 12.

On the other hand, the filler wire 19 which does not conduct electricity is automatically fed through the guide tip 18, and the tip end of the filler wire 19 is inserted into the molten pool 17. For the filler wire 19, a solid wire, a flux cored wire, a metal cored wire, or the like is used. Molten pool 17
The tip of the filler wire 19 inserted in the
It is melted by the heat of 16 and the heat of the molten pool 17. At that time, the ratio of the heat of the arc 16 and the heat of the molten pool 17 absorbed by the filler wire 19 is substantially determined by the position where the tip of the filler wire 19 is inserted.

Thus, the weld bead 20 is formed by cooling and solidifying the molten pool 17 in which the base material 12, the electrode wire 15 and the filler wire 19 are melted, and the base material 12 is welded.

According to the welding method having the above structure, the electrode wire 15
In addition, since the filler wire 19 is melted in the molten pool 17, the amount of welding can be increased without particularly increasing heat input. Further, the filler wire 19 is melted in the molten pool 17 when melted.
Since the heat is absorbed by the molten pool 17, the molten pool 17 is cooled and solidification is promoted.

[0011]

As described above, according to the present invention, the tip of the filler wire that does not conduct electricity is inserted into the molten pool formed by the electrode wire on the surface of the base material. The filler wire is melted in addition to the wire, and the amount of welding can be increased without particularly increasing heat input, and the filler wire takes heat of the molten pool at the time of melting to promote cooling and solidification of the molten pool. as a result,
In welding in the upright or upright position, cooling and solidification of the molten pool are promoted, which makes it difficult for the molten metal to drip, widens the welding current range that can be welded, and improves welding efficiency. . Also, in a general welding position,
A smaller heat input than before can be used to obtain the desired amount of welding, and the heat input is reduced by the cooling effect of the molten pool, so the heat effect on the base material is reduced and the deterioration of the material is prevented. At the same time, the mechanical properties of the deposited metal are improved, and the thermal strain of the product is reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view of a gas shield arc welding method showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a conventional gas shielded arc welding method.

[Explanation of symbols]

 12 Base metal 13 Shield gas 15 Electrode wire 16 Arc 17 Molten pool 19 Filler wire

Claims (1)

[Claims] 1. The gas shielded arc welding method according to the gas shielded arc welding method, wherein the tip of a filler wire that does not conduct electricity is inserted into a molten pool formed by the electrode wire on the surface of the base material.