JPH02280972A - Contact tip for consumable electrode type arc welding torch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a contact tip (hereinafter simply referred to as a tip) for a consumable electrode type arc welding torch used for inert gas welding.

(Prior Art) This type of conventional chip will be explained with reference to the perspective view of FIG.

In the figure, a tip 1 is formed with a through hole 1a through which a wire 2 serving as a consumable electrode is inserted, and serves to guide the wire 2 and supply welding current to the wire 2.

(Problem to be Solved by the Invention) However, in the above configuration, the wire 2
If the supply speed and melting speed do not match, if the supply speed is faster than the melting speed, the arc will be shortened and the tip of the wire 2 will plunge into the base metal.

On the other hand, if the melting speed was faster than the supply speed, the arc would become longer, and the arc would eventually reach the tip of the tip 1, causing seizure of the wire 2.Seizing is caused by the elongated arc. molten wire 2
When the tip of the wire reaches the tip of the tip 1, the entire periphery of the through-hole 1a will be melted, and in severe cases, the wire 2 will be burned to the tip of the tip 1, making it impossible to continue welding, and welding must be performed again. When doing so, there was also the problem that the chip 1 had to be replaced.

The present invention solves the above problems and provides a chip that is less likely to cause burn-in and does not require replacement even if burn-in occurs.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a notch ranging from an acute angle to an obtuse angle at the tip of the tip, and also opens the wire guide surface of the provided notch first. It is shaped like a cone. Moreover, the above-mentioned notch portion is formed of an insulating material such as ceramics.

(Function) With the above configuration, even if the bead-shaped molten part at the tip of the wire reaches the tip of the tip, the notch is provided, so the possibility of the wire sticking to the tip of the tip is reduced. Even if the wire is notched, the wire can be easily separated from the tip by applying a force in the direction of the notch, so there is no problem in feeding the wire during the next welding, and therefore there is no need to replace the tip.

Further, if the wire guide surface of the above-mentioned notch is formed into a conical shape with an open end, the wire will be less likely to seize, and even if it seizes, it will be limited to the tip, making it easier to separate.

Furthermore, if the notch is made of an insulating material, the wire will not seize and the length of the notch in the axial direction can be reduced, which not only allows the wire to be guided stably, but also reduces the length of contact with the wire. is longer, which increases the stability of the welding current.

(Example) The present invention will be explained with reference to FIGS. 1 to 5 regarding a third example.

FIG. 1 is a perspective view of a chip 1 showing a first embodiment of the present invention. The chip 1 has a through hole 1a at its tip, and has a notch angle θ and a notch length shown by dimension lines in the figure. A notch 1b is formed.

The chip 1 is made of chrome steel or copper and is formed by machining it with a lathe and then cutting it with a milling machine. The notch angle θ is 2
A range of 0 degrees to 200 degrees is effective, and a range of 90 degrees to 180 degrees is most practical.

FIG. 4 shows the relationship between the notch angle θ and the probability that the wire 2 will seize at the tip of the chip 1 when seizing occurs. If the notch angle θ is greater than 200 degrees, the wire 2 will seize in the middle of the notch 1c or at the base of the notch 1c, and a large force will be required to separate the wire 2 from the chip 1. Moreover, the effect as a guide is weakened, and the wire cannot be supplied to the targeted welding point, and the stability of the welding current is reduced due to a decrease in the contact area with the wire 2.

FIG. 5 shows the notch angle θ and the ease with which the chip 1 and the wire 2 can be separated when the wire 2 seizes at the tip of the chip 1. In this case, since the larger the notch angle θ is, the smaller the force is required to separate the wire 2 from the chip 1, the notch angle θ can be said to be 90 degrees to 180 degrees.

Moreover, the notch length a is practically 1 to 10 cm.

If it is less than IW, it will not be effective in separating the wire 2 from the chip 1 when seizing occurs, and if it exceeds 10 degrees, the guiding effect of the first through hole 1a will weaken and the arc will tend to become unstable.

Next, a second embodiment of the present invention will be explained with reference to FIG.

The difference between this embodiment and the first embodiment shown in FIG. 1 is as follows.
The cutout portion 1c is formed of an insulating material. By making the notch 1c of an insulating material, such as ceramics, the wire 2 is prevented from sticking to the notch 1c. As a result, the notch angle θ and the notch length a can be reduced, the guiding effect of the tip 1 is improved, and the stability of the welding current is increased.

The method for joining the notch 1c and the chip 1 is as follows.

Mechanical or chemical joining such as screwing, caulking, press-fitting, etc. is used.

Next, a third embodiment of the present invention will be described with reference to FIG.

The difference between this embodiment and the first embodiment shown in FIG. 1 is as follows.
The guide surface of the notch portion 1c is a conical surface with an open end. Since the guide surface of the notch 1c is a conical surface, if the wire 2 seizes to the tip of the notch 1c, the degree of welding to the tip is small, and the gap between the wire 2 at the tip is large, so the wire 2 can be removed with an extremely small force. can be separated.

(Effects of the Invention) As explained above, according to the present invention, wire seizure can be prevented or significantly reduced, and welding efficiency can be improved.

Furthermore, even if seizure occurs, the wire and chip can be easily separated, improving work efficiency, eliminating the need to replace chips due to seizure, and extending the life of the chip.

[Brief explanation of drawings]

1, 2, and 3 show the first and second embodiments according to the present invention.
FIG. 4 and FIG. 5 are diagrams showing the relationship between the angle of a notch provided in the chip and its effect, and FIG. 6 is a perspective view of a conventional chip. 1... Contact tip (chip) for consumable electrode type arc welding torch, 1a... Through hole, 1b... Notch, le... Notch portion. 2...Wire. Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1 ■ Figure 3 Figure 2 Figure 1b...Notches lc゛°b1 missing δ Figure 6 Figure 4 Procedure correction drop t (voluntary) Figure 5 Notches笈θ (ya) Month 21, 1990

Claims (4)

[Claims] (1) In a contact tip for a consumable electrode type arc welding torch that has a through hole in the center through which the consumable electrode is inserted, a notch is formed at the tip of the contact tip with two surfaces whose axial cut surface passes through the center. Contact tip for consumable electrode type arc welding torch featuring (2) The contact tip for a consumable electrode type arc welding torch according to claim (1), characterized in that the notch angle is in the range of 20 degrees to 200 degrees and the axial notch length is in the range of 1 mm to 10 mm. (3) The contact tip for a consumable electrode type arc welding torch according to claim (1), wherein the notch portion is made of an insulating material. (4) The contact tip for a consumable electrode type arc welding torch according to claim (1), wherein the inner circumferential surface of the notch portion is a conical surface with an open tip.