JPS62270280A - Tip shape shaping method for welding wire - Google Patents

Abstract

PURPOSE:To perform the welding without a difficulty at the time of the next welding by drawing the wire tip immediately after the welding is finished into a chip and shaping a shape of the wire tip. CONSTITUTION:A molten bead 6b larger than a diameter of a wire 2 is formed to the tip of the wire 2 immediately after the welding is finished and the wire 2 is drawed into an insertion hole 3a in the chip 3 by a wire feeder 5 at the time of a high temperature state. The molten bead 6b is forcibly separated at the tip of the chip 3 by the drawing and the wire tip 6a is shaped and made linear same as the diameter of the wire 2. Next, in order to bring the shaped part 6a back to the former position, the wire 2 is projected by the drawing length from the tip of the feed chip 3 by the feeder 5. In this way, the next welding is performed without the difficulty.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a consumable electrode type welding method such as MIQ or MAG, and particularly relates to a molten ball formed at the tip of a welding wire after welding is completed. This invention relates to a method for shaping the tip shape of a welding wire by removing and shaping it.

[Prior Art] Conventionally, in consumable electrode welding such as M f G and MAG, a welding wire is sent through a tip at the tip of a torch nozzle, and an arc current is supplied to the tip of the wire through the tip, and a depth is surrounded. Welding is performed by spraying an inert gas or a shielding gas made by mixing an appropriate amount of an active gas with an inert gas from a nozzle, and spraying droplets from the wire onto the welding part.

In this consumable electrode type welding, the molten material remains at the tip of the wire after welding is completed, and this solidifies into a spherical shape, and when welding is performed next time, the arc for the solidified molten ball remains. Occurs irregularly.

For this reason, each time we weld, the tip of the wire is cut to remove the molten ball and shape the tip of the wire.

[Problems to be Solved by the Invention] However, if the tip of the wire is cut off every time weld, the work is troublesome.

The present invention has been made in consideration of the above circumstances, and provides a method for shaping the tip of a welding wire by removing a molten ball formed at the tip of the wire after welding is completed, and which does not interfere with the next welding. The purpose is to cover Jt.

[Means and effects for solving the problems] In order to achieve the above object, the present invention provides a welding method for welding by feeding a welding wire through the tip of a torch nozzle and passing an arc current through the tip of the wire. In this method, the tip of the wire is pulled into the tip immediately after welding (within about 0.5 seconds) to shape the tip of the wire, and even if a molten ball is formed at the tip of the wire after welding is finished, When this molten ball is in a high temperature state, the tip of the wire is drawn into the tip, so the molten ball is forcibly separated from the wire at the tip of the depth, and the tip of the wire is shaped into a linear shape, so that the next welding is difficult. At that time, welding could be carried out without any problems.

[Example] Hereinafter, a preferred example of the method for shaping the tip shape of a welding wire according to the present invention will be described with reference to the accompanying drawings.

In Figures 1 to 3, reference numeral 1 denotes a consumable single-pole torch nozzle such as MIG or MAG, which has a depth 3 made of a conductor and its tip 3 to guide a welding wire 2 and to flow an arc current through the wire 2. It is formed of a nozzle 4 for surrounding the white t2 and ejecting an inert gas, Ar gas, and a shielding gas such as CO2 gas.

The welding wire t72 is sequentially moved to the tip 3 by the wire feeding device 5.
It is designed to be sent through.

Next, a method for shaping the tip shape of a welding wire according to the present invention will be explained.

First, at the end of welding, in order to finish the surface shape of the welded part, the welding current value is lowered and a crater treatment is performed on the surface of the welded part so that no pockmarks remain, and then welding is completed. Immediately after this welding is completed (within approximately 2.2 seconds), the first
As shown in the figure, a molten ball 6 larger than the diameter of the wire 1'72 is formed at the tip of the wire 2, but while this molten ball 6 maintains a molten state or is in a high temperature state, in other words, during welding Immediately after completion (within about 0.5 seconds), the wire feeding device 5 pulls the wire 2 into the insertion hole 3ak in the chip 3 in the opposite direction to the feeding direction of the wire 2 as shown in FIG. As the wire 2 is drawn in, the molten balls 6b are separated from each other at the tip 3 in a strong tIII manner, and the wire tip 6a is shaped into a linear shape having the same diameter as the wire 2.

Since the molten balls 6b separated at this time are in a high temperature state, they may adhere to the tip of the chip and form a shape 19 as shown in FIG.

Next, in order to return this shaped portion 6a to its original position, as shown in FIG. .

With the molten ball 6 formed at the tip of the wire 172, insert the wire 172 into the insertion hole 3a in the chip 3.
By pulling it in and making it protrude from the depth 3 again, the next welding can be performed without any problem.

This shaping of the wire tip after welding is completed can be done automatically, and can be easily incorporated into an automatic welding process 17-1-, for example, as shown in FIG.

In other words, crater treatment is performed by lowering the current and voltage from normal self-welding, and immediately after the crater treatment is completed (approximately 0,
S@), pull in the wire at a speed that allows the molten ball to be shaped (wire retract for 1+ seconds), hold it until the molten ball 6b is solidified (wire stop for t2 seconds), and then retract at the same speed as the retraction speed. Then, the machine performs WY V @ embedding (1+ seconds of "noiya inding"). After that, it detects and judges whether there is a workpiece to be welded in the same way as normal automatic VJ welding, and then performs automatic welding again.

Furthermore, in J3 according to the present invention, the molten ball 6 formed at the tip of the wire 2 can be removed and shaped immediately after the end of welding (within about 0.5 seconds), so for example, in the automatic welding flowchart shown in FIG. +=- When sensing the shape of a workpiece with the chi nozzle 1, the sensing can be performed more reliably. That is, in conventional sensing, sensing has been performed at the tip of the wire 2, but the length of the wire 2 protruding from the tip of the depth 3 varies, and it is difficult to say that it is accurate. , since there is no molten ball 6 left, the wire 2 is pulled into the tip 3, and the tip of the tip 3 touches the workpiece 7, as shown in FIG.
The shape and position of the object can be sensed and measured accurately.

[Effects of the Invention] As is clear from what has been described in detail above, the present invention provides the following distinct effects.

(1) Immediately after the end of welding (within about 0.5 seconds), the tip of the wire V can be pulled into the tip to remove the molten ball that is formed at the end of welding, thereby shaping it into a wire shape.

+21 Since the shape of the wire tip after welding is shaped, the next welding can be performed without any problem.

[Brief explanation of drawings]

1 to 3 show a method for shaping the tip shape of a welding wire according to the present invention, FIG. 1 is a sectional view showing the state immediately after welding, and FIG.
The figure is a cross-sectional view of the wire A7 drawn in, Figure 3 is a cross-sectional view of the wire after shaping, Figure 4 is a diagram showing the 70-shaft of the present invention, and Figure 5 is the wire shaped by the present invention. It is a perspective view which does not show an example of sensing a work later. In the figure, 1 is a torch nozzle, 2 is a welding wire, 3 is a tip, 5 is a wire feeding device, and 6 is a molten ball. Patent Applicant: Ishikawajima Harima Jut Rin Co., Ltd. Representative Patent Attorney: Nobuo Tani Figure 1, Figure 2, Figure 5, Figure 4, Figure 5

Claims (1)

[Claims] Feed the welding wire through the tip of the torch nozzle,
A method for shaping the tip of a welding wire in a welding method for welding by flowing an arc current from the tip of the wire, which is characterized by pulling the tip of the wire into the tip immediately after welding is completed to shape the tip of the wire.