JPS63165076A - Method for feeding welding wire - Google Patents

Abstract

PURPOSE:To make a welding bead continuous and to prevent the generation of a welding defect by performing the feeding of a filler wire by advancing and retreating the tip of the filler wire periodically inside the arc under shielding gas atm. CONSTITUTION:A nonconsumable electrode 1 is provided for the base metal 9 to be welded and the wire reel 4 feeding a filler wire 3 into the arc 11 under a shielding gas atm., a feeding motor 5, etc., are arranged. In this case the filler wire 3 is fed into the arc 11 with advancing and retreating repeatedly at a specific period via a control device. When the wire 3 tip is melted inside the arc 11, the wire 3 retreats outside the arc 11 to prevent the spheroidizing of the tip. Consequently the filler wire 3 is fed without forming spherical part at its tip and the welding bead is made continuous. Owing to the discontinuity in the transfer of a droplet being eliminated the generation of a welding defect is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a non-consumable electrical gauge type gas shield welding wire feeding method suitable for welding low melting point materials.

[Conventional technology]

In the conventional non-consumable electrode type gas shield welding method, as shown in the perspective view of FIG. The filler wire 3, which is determined by the material of the base material 9 to be welded, is fed out from the wire reel 4 by a filler wire feed roller 6 and a pressure roller 7 driven by a filler wire feed motor 5. The welding wire is fed with its tip toward the vicinity of the non-consumable electrode 1 via the filler wire guide tip 8, and while a shielding gas 10 such as argon gas is spouted from the tip of the shielding gas nozzle 2, a filler wire is supplied from a welding power source (not shown). Electric power is supplied between the consumable electrode 1 and the base material 9 to be welded to create an arc 1.
1 is generated, the filler wire 2 is inserted into the arc 11 and melted, and welding progresses.

However, when the base metal 9 to be welded is an aluminum alloy, the filler wire 3 is also made of an aluminum alloy, but with such a low melting point metal, the addition of the filler wire A may be small for thin plate welding, etc. If the speed is slow, the tip of the filler wire 3 will become a large ball and normal addition will not be possible.

That is, as shown in the explanatory diagram in FIG. If the addition feed speed is slow, metals with low melting points such as aluminum alloys will form a large spherical 3 at the tip of the filler wire 3, and this spherical 3 will be inserted into the arc 11 and melt and fall, but the remaining The tip of the filler wire 3 is again formed into a large spherical shape by the radiant heat of the arc 11. Therefore, in such a situation, the transfer of the droplets becomes discontinuous, and good welding cannot be expected.

[The key point that the invention attempts to solve]

The present invention was proposed in view of these circumstances, and
When the filler wire of non-consumable electrode type gas shield welding is fed at low speed, the tip of the filler wire is prevented from becoming spherical, a continuous weld bead is obtained, and a good welded joint without weld defects is obtained. Further, it is an object of the present invention to provide a welding wire feeding method that can effectively and accurately carry out non-consumable electrode type gas shield welding of low melting point materials.

Means for Solving Problem C] To this end, the present invention provides the above-mentioned method for feeding a filler wire in non-consumable electrode type gas shield welding into an arc generated between a non-consumable electrode and a base material to be welded. It is characterized by feeding the filler wire while periodically moving its tip forward and backward into an arc in a sealing gas atmosphere.

[For production]

The cleaning structure described above prevents the tip of the filler wire from becoming spherical when feeding the filler wire at low speed in non-consumable electrode type gas shield welding, resulting in a continuous weld bead and a good weld without defects. A welding joint can be obtained, and a welding wire feeding method that can effectively and accurately perform non-consumable electrode type gas shield welding of low melting point materials can be obtained.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the method of the present invention, and FIGS. 2 and 3 are operation explanatory diagrams, respectively.

First, in FIG. 1, a non-consumable gas such as thoriated tungsten protrudes from the center of the tip of the shield gas nozzle 2 and is directed toward the surface of the base material 9 to be welded. A determined filler wire 6 is passed from a wound reel 4 to a filler wire feed roller 6 and a pressure roller 7 driven by a filler wire feed motor 5.
The filler wire guide tip 8 guides the filler wire guide tip 8 and feeds the filler wire so that its tip is inserted correctly into the welding arc 11. The filler wire feed motor 5 is driven by a control device (not shown) to advance and retreat the filler wire 3 periodically.

In such a device, a shield gas 10 such as argon gas is ejected from the tip of a shield gas nozzle 2 to create a shield gas atmosphere around the non-consumable electrode 1, and a welding power source (not shown) is used to connect the non-consumable electrode 1 to the workpiece. Electric power is supplied between the base metal 9 and a high-temperature arc 11 is generated between the two, and when the tip of the filler wire O is inserted into this arc 11, the filler wire 3 is exposed to the high heat of the arc 11. As the filler wire 3 is fed, the tip of the filler wire 3 is inserted into the arc 11 and melted, as shown in FIG. Immediately, as shown in FIG. 3, the tip of the filler wire 3 is moved back outside the arc 11 to prevent it from being melted by the radiant heat of the arc 11.

This advance and retreat of the filler wire 3 is repeated periodically to prevent the tip of the filler wire from forming a spherical shape, and the repetition period is appropriately set depending on the wire diameter, material, etc. Further, the retracted position of the tip of the filler wire is set at a position where there is little arc radiant heat in the shielding gas atmosphere and the tip does not melt.

According to this method, when the filler wire is fed at a low speed such as when welding thin plates of materials with a low melting point such as aluminum alloy, the tip of the filler wire is prevented from becoming spherical and a continuous bead is obtained. A good welded joint with no welding defects can be obtained.
[Effects of the Invention] In short, according to the present invention, when feeding the filler wire in non-consumable electrode type gas shield welding into the arc generated between the non-consumable electrode and the base material to be welded, When feeding a filler wire at low speed in non-consumable electrode type gas shield welding, the filler wire is Spheroidization of the tip is prevented, a continuous weld bead is obtained, and a good welded joint with no weld defects is obtained, which in turn enables effective and accurate non-consumable electrode type gas shield welding of low melting point materials. The present invention is extremely useful industrially because it provides a welding wire feeding method that can be used.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the welding wire feeding method of the present invention, and FIGS. 2 and 3 are explanatory views of the same operation. FIG. 4 is a perspective view of the conventional method, and FIG. 5 is an explanatory diagram of the same operation. 1... Non-consumable electrode, 2... Shield gas nozzle, 3
...Filler wire, 4...Wire reel, 5...Filler wire feeding motor, 6...Filler wire feeding roller, 7...Pressure roller 18... Filler wire guide tip, 9... Base material to be welded, 10...
Shielding gas, 11. ·,arc. Sub-Agent Patent Attorney Masaru Tsukamoto Letter Box 1 Figure 2 Figure 3v! J Figure 4 Figure 5

Claims (1)

[Claims] When feeding the filler wire of non-consumable electrode type gas shield welding into the arc that occurs between the non-consumable electrode and the base metal to be welded, the tip of the filler wire is periodically inserted into the arc in the sealing gas atmosphere. A welding wire feeding method characterized by feeding the welding wire while moving it forward and backward.