JPS6289577A - Mig welding method - Google Patents

Abstract

PURPOSE:To increase the joining strength by supplying the component which evaporates in case of MIG welding by dipping the component adjusting material in a molten pool. CONSTITUTION:The component adjusting material 3 which moves horizontally with a MIG welding wire 2 is held at the upper part of the joining part 1a of a base metal 1. A molten pool 5 is formed with the tip 2a of the wire 2 being melted when an arc 4 is generated by approaching the wire 2 to the joining part 1a. In this case, the component adjusting material 3 which is melted with the arc heat comes into the molten pool 5 to supply one part of the compo nent having evaporated in the atmosphere. Consequently the effective component inside the molten pool 5 is secured properly and a bead 6 is formed. In this way, the component evaporating with the arc heat is supplied effectively by the component adjusting material 3 and the bead 6 of uniform component is formed as well with the molten pool 5 being stirred by the force and convective action of the arc 4. Consequently the joining strength is increased.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for welding base materials (workpieces) to be joined by MIG welding wire V.
The present invention relates to a MIG (HiG) welding method in which welding is performed while adjusting the composition of the weld metal using a composition adjustment wire.

[Technical direction 1H of the invention and its problems] In general, the MIG welding method uses a MIG welding wire X7 (rod) that also serves as an electrode to emit an arc at the joining part of each base material, and joins the wires while melting them. It has become. Also, when an arc is emitted from the MIG welding wire during welding, the tip of the MIG welding wire melts due to the Joule heat and arc heat caused by the flowing current, and the molten droplets form a workpiece. 1 also seems to be moving to the moon joint and welding. In this case, since the droplets of the MIG welding wire are exposed to arc heat, some of the components in the droplets evaporate and disappear, and the weld metal that solidifies at the joint of the base metal is Normal (standard) by MIG welding wire ψ
It is made of a leather ingredient that has changed from its ingredients.

In this way, when using MIG welding wire, it is necessary to predict and adjust the dissipated component in advance. , it changes depending on the welding current, and differences occur depending on the welding conditions of the weld metal components, and it is difficult to predict and adjust this in advance.

On the other hand, in the MIG welding method, when adjusting the composition of the MIG welding wire, it may be considered to include in advance 10 evaporation loss due to arc heat, but in the case of alloy material, in advance, In the case of a small metal with a B1 solid solubility limit that you want to contain in a large amount, there is a drawback that it is not possible to create an alloy with the required component ratio. The joint may not be properly joined due to welding strength.

That is, for example, when using a MIG welding wire containing ln, vapor from the easily evaporated Zo is generated violently from the tip of the MIG welding wire as an arc generation point, disturbing the stability of the arc during welding, and damaging the base metal. This may impair bead formation at the joint and cause weld defects.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and supplies the components that evaporate during MIG welding to the molten pool used to form the rod, while providing an appropriate effect on the joints of the base metals. The present invention provides a MIG welding method that performs welding with a certain amount of chemical components and also aims to improve the high electrical strength of the joint.

[Summary of the invention]

In the present invention, a MIG welding wire that also serves as an electrode is brought close to the joint of each base material to avoid generating an arc and form a molten pool, and the components that evaporate during MIG welding are removed from the molten pool using a composition adjusting material. In order to improve the joint strength, MIG welding with the appropriate active ingredients was carried out.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 indicates each base material to be joined, and a MIG welding wire 1 (also referred to as a welding rod) 2 is placed directly above the joint portion 1a of each base material 1 to be joined. EJ month 1
It is designed to be able to move horizontally with respect to the joint portion 1a. Further, at a position close to the MIG welding wire V2, for example, a component adjusting material (wire) 3 in the form of a thin wire is held so that it can move horizontally together with the MIG welding wire 2.

Therefore, when performing MIG welding on the joint 1a of the base material 441, the tip 2a of the MIG welding wire 2, which also serves as an electrode, is brought close to the joint 1a of each base material 1 and the current is applied. By flowing, an arc 4 is generated between the tip 2a of this MIG welding wire V2 and the joint portion 1a, and this MIG welding wire V
Due to the Joule heat and arc heat caused by the current flowing in 2,
The tip 2b of the MIG welding wire 72 is melted, and the molten droplets are transferred to the welded part 1 of the base material 1 heated by arc heat.
Although some of the components in the droplets evaporate into the atmosphere and disappear, they are immersed in the molten pool 5 and melted by arc heat. The component adjustment material 3 replenishes some of the components that have evaporated into the atmosphere, thereby ensuring an appropriate amount of active ingredients and forming beads 6.

Next, when the base material 1 is made of Cu-Zn alloy, the MIG welding wire V2 is made of pure copper, and the composition adjustment material 3 is made of 70, when the arc 4 is generated by the MIG welding wire 2, The droplet moves to the joint 1a, and in this process, the droplet C is made of pure copper, which is a material that is relatively difficult to evaporate.
Only a small portion of the copper evaporates. On the other hand, the base material 1 is heated by the arc 4 and melts to form a molten pool 5, and the Zn of the base material 1, which easily evaporates, partially evaporates and disappears. , is replenished by the component adjusting material 3, and is stirred by the force of the arc and the convection action to produce uniform components and solidify.

Note that since the component adjusting material 3 is located at a sufficient distance from the arc 4, there is no risk of being affected by the heat from the arc 4, and there is less risk of loss of components that are easily evaporated. In addition, the component adjustment of the component adjustment material 3 is the same as the MIG welding wire 2! ! ! This is done by adjusting the supply of 4113.

Next, in another embodiment of the present invention shown in FIGS. 2 and 3, the composition adjustment material 2 is made into two composition adjustment wires, and moreover, it can be buried in the joint part 1a during welding. The welding is carried out using the same method, thereby improving the welding strength.

In particular, although the composition adjustment material 2 according to the present invention has been described as a wire made of a metal material, for example, a powdered non-metal such as a powdered metal or a powdered ceramic may be used within a range that does not change the gist of the present invention. That is freedom.

〔Effect of the invention〕

As described above, according to the present invention, the joint portion 1 of each base material 1
The MIG welding wire 2, which also serves as an electrode, is brought close to a to generate an arc 4 to form a molten pool 5, while the components that evaporate during MIG welding are removed by the composition adjusting material 3.
Therefore, it is possible to perform MIG welding without using normal active ingredients, and at the same time, it is possible to improve the joint strength of the joint portion 1a.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the MIG welding method of the present invention,
FIGS. 2 and 3 are diagrams showing other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Base metal, 1a... Joint part, 2... MIG welding Mitsuya, 3... Composition adjustment material, 4... Arc, 5...
- Molten pool, 6...bead.

Claims (1)

[Claims] 1. A MIG welding wire that also serves as an electrode is brought close to the joint of each base material to generate an arc and form a molten pool, while
A MIG welding method characterized in that components that evaporate during MIG welding are replenished into the molten pool using a component adjusting material to perform MIG welding with appropriate effective components. 2. The MIG welding method according to claim 1, wherein the component adjusting material is made of wire powder metal or powder non-metal.