JPH01181979A - Consumable electrode type contact chip for arc welding - Google Patents

Abstract

PURPOSE:To obtain a consumable electrode type contact chip for arc welding at low cost dy making the core part getting into contact with a consumable electrode by the Cr copper of specified composition and making the remaining contact chip main body part by the conductive metal softer than the core part. CONSTITUTION:The core part 1 getting into contact with a consumable electrode is formed by winding the Cr copper wire contg. 0.1-5% Cr in a coil shape and inserted to a contact chip main body part 2. Said chip main body part 2 is taken to be made of the conductive metal softer than said core part 1 and a brass(contg. 25-45% Zn), Cu(contg. >=99% Cu), Al, Al alloy, etc., are appropriate. The hard wire having the outer diameter equiv. to the specified inner diameter is inserted into said core part 1. The contact chip 5 having the through hole part 3 of a wire 4 and good durability is easily formed by executing swaging on the chip main body part thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a welding contact tip used in a consumable electrode type arc welding torch.

BACKGROUND OF THE INVENTION FIG. 4 shows an example of a conventional welding contact tip (hereinafter simply referred to as a tip). The tip 6 serves as a guide for supplying a consumable electrode (hereinafter simply referred to as a wire) to the welding area through a wire through hole 3 provided at its center, and as a power supply for supplying welding current to the wire.

The chip 5 performs contact power supply to the wire, and the contact part of the wire does not reach a high temperature during power supply, and the wire passage hole 3 is significantly worn due to the feeding of the hedge wire, and depending on the state of wear, the wire may be damaged. It will no longer be able to fulfill its role of feeding power to the guides and wires.

For this reason, conventional tips were entirely made of chrome steel, which has excellent wear resistance at high temperatures.

Problems to be Solved by the Invention However, such conventional chips are made entirely of expensive ROM copper, resulting in extremely high material costs and some problems in processing.

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems is to divide the chip into two parts, a core part and a chip main part, from the viewpoint of one function.
The material composition is suitable for each.

action The effect of this technical means is as follows.

The minimum part (core part) of the wire hole, which serves as the wire guide and welding current feeding point, is made of chrome copper, which is traditionally used as a strong, heat-resistant, and wear-resistant material. By constructing the chip body from an inexpensive soft conductive metal, most of the chip is comprised of the chip body, so the material cost of the entire chip can be significantly reduced.

Example FIG. 1 shows an embodiment according to the present invention.

In FIG. 1e), 1 indicates the core portion and 2 indicates the chip body. The core part 1 is wound into a coil using a chromium copper wire, and the wire diameter of the coil is effectively 0.1 mm to 2 mm, and the most practical is 0.5 n+m to 1-2 mm. o
-If the thickness is less than 1 mm, the effect of core part 1 will be significantly weakened, and 2
If it exceeds mm, it will be difficult to process the coil and the cost benefit will be reduced. The winding pitch is from 1 (close winding) to 2 times the wire diameter ratio (
(sparse volume) is valid. Twice.

If it exceeds this value, the fixing of the coil becomes unstable, the power supply to the wire 4 becomes unstable, and the stability of the welding current deteriorates. At this time, the leading end of the tip, which is particularly worn, may be tightly wound, and the rear portion may be loosely wound.

In this embodiment, as a method for connecting the core part 1 and the chip body part 2, the core part 1 is inserted into the chip body part 2, and a welding current is supplied to the wire in the core part 1. A hard wire with an outer diameter corresponding to the inner diameter of the chip is inserted, and a die with a conical forming part is applied from the outer periphery of the chip body to apply impact pressure to the chip material while stretching and pressurizing the chip material to form a wire hole. A mechanical joining means is used in which pressure is applied by forming a hole with an inner diameter for supplying welding current to the part (hereinafter referred to as swaging process). In addition, as a joining method, mechanical joining of ponds (screwing of coils) is also possible.

(caulking, etc.), chemical bonding, or metallic bonding. FIG. 1(b) shows a cross-sectional view after the swaging process.

At this time, the length of the coil is either a part of the tip of the tip (20 mm in the example) as shown in FIG.
It may be the entire length of the chip like C"l.

In the case of pressure welding by swaging process, the chip body part 2 is embedded in the gap between each pitch of the chip body part 2 and the coil C core part during the swaging process, as shown in FIG. 1(b). Therefore, the core part 1 is fixed by 6A-zip welding, and when the wire is fed, the core part 1 does not move in the axial direction (without being pushed out) - and even at large currents, no heat is generated at the welding part. Almost unrecognized.

In order to increase the mechanical connection between the core part 1 and the chip body part 2, a structure in which the tip of the chip body part 2 is bent inward, or a structure in which the tip of the chip body part 2 is bent inward, or either A non-uniform portion (an uneven portion, a knurled portion, etc.) may be provided on one or both of the portions.

In the chip, the part that serves as the guide part of the wire 4 and the feeding point of the welding current to the wire 4 is a thin layer part of the inner wall of the wire through hole 3, so this important thin layer part is connected to the core part 1.
By constructing this with hard chrome steel and the remaining part (chip body part 2) with economical soft conductive metal, the life of the chip is almost the same as that of conventional products, and it is also easy to machine. Easy and inexpensive chips can be supplied to the market.

Next, FIG. 2 shows another embodiment of the present invention.

7. In this embodiment, the core portion 1 of the previous embodiment is changed from a coiled core portion to a pipe or a solid round bar with holes formed therein.

The length of the pipe and round rod is the tip end (20 mm in the example) as shown in Figure 2 (a) or - Figure 2 ('b)
It is also possible to set the total length of the chip as shown in . The wall thickness of pipes and solid round bars with holes drilled is from 1mm to 2m.
m is effective.

The joining means was the same as in the previous example, and the effect was equivalent to that in the previous example.

Next, FIG. 3 shows an embodiment of a further pond of the present invention.

In this embodiment, the cross-sectional shape of the core portion 1 is T-shaped. In Fig. 3(a), the single-digit T-shaped core part-2
indicates the chip body. In the figure, a length of -a of 1 mm or more is effective, and a length of 12 mm to 15 ml is most practical. In addition, the length of the mating part should be 2 mm from the mechanical connection surface.
Although the above is desirable, the entire length of the chip may be used as shown in FIG. 3('b).

The joining means was the same as in the previous example, and the effect was equivalent to that in the previous example.

Effect of the invention As described above, according to the present invention, the following effects can be achieved.

(1) By configuring the chip with a core part (chrome steel) and a chip body part (soft conductive metal), the material cost can be reduced while maintaining the same performance and lifespan as conventional chips.

(2) Since the chip body is made of a soft conductive metal, work efficiency such as processing the chip external shape can be improved. Furthermore, the life of processing tools such as cutting tools and rolling rollers is extended.

(3) By making the core part into a coil shape, the step of drilling holes in chrome steel can be omitted. Thereby,
Maintenance due to damage to the drill is eliminated and work efficiency is improved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a chip showing one embodiment of the present invention, and FIG.
3 and 3 are cross-sectional views of chips showing embodiments of the pond of the present invention, respectively, and FIG. 4 is a cross-sectional view of a conventional chip. 1... Core part, 2... Chip body part -
3.---Wire through hole, 4...Wire 5
・・・・・・Contact chimp. Name of agent: Patent attorney Toshi Nakao (Male) 1 person Figure 1? Figure 2 Blade Figure 3 Figure 4

Claims (5)

[Claims] (1) In a contact chip that has a through hole for the consumable electrode in the center, the core part that contacts the consumable electrode is made of chromium copper with a chromium content of 0.1 to 5%, and the remaining contact chip body is the core part. A consumable electrode type arc welding contact tip characterized by being made of a softer conductive metal. (2) The contact tip for consumable electrode type arc welding according to claim 1, wherein the soft conductive metal of the contact tip main body is brass (zinc content: 25% to 45%). (3) The contact tip for consumable electrode type arc welding according to claim 1, wherein the soft conductive metal of the contact tip main body is copper (copper content: 99% or more). (4) Claim 1, characterized in that the soft conductive metal of the main body of the contact chip is aluminum.
Contact tip for consumable electrode type arc welding as described in Section 1. (5) The contact tip for consumable electrode type arc welding according to claim 1, wherein the soft conductive metal of the contact tip main body is made of an aluminum alloy.