JPS6245822Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention uses continuously bent welding wire.
The present invention relates to a current-carrying tip that guides a welding wire to a welding groove without twisting and improves current-carrying performance to the welding wire.

In recent years, CO ₂ arc welding, MIG arc welding or
In MAG welding, etc., as shown in Figure 1, a predetermined width is set according to the oscillation width and welding speed.
L ₁ , the welding wire 1 continuously bent at a predetermined pitch P ₁ is supplied to the part 3 to be welded of the base metal 2, and the welding arc 4 is created without swinging the welding wire 1.
A method of oscillating is adopted. In this method, a cylindrical guide nozzle 6 connected to a power source 5 is used to feed and energize the bent welding wire 1, but since the conventional guide nozzle was simply cylindrical, The welding wire can easily rotate around the welding wire 1 inside the nozzle.
This has the disadvantage that the desired oscillation width cannot be obtained because the oscillation width is twisted.

The object of the present invention is to provide an energizing chip that can stably feed a bent welding wire to a welding groove without twisting, and can also sufficiently energize the welding wire. To achieve this purpose, the present invention has a cylindrical current-carrying tip installed at the tip of the guide nozzle that guides the welding wire, which is continuously bent at a constant width and pitch, to the welding groove. The connecting tip base end has a circular cross section with an inner diameter slightly larger than the bending width of the welding wire, while the tip end facing the welding groove has a circular cross section with an inner diameter slightly smaller than the bending width, and its axis The length in the direction is shorter than 1/2 of the bending pitch of the welding wire.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The current-carrying chip according to the present invention will be described in detail below based on embodiments shown in the drawings.

The present invention relates to an energizing tip that accurately positions the bending width of a bent welding wire by guiding it to the center of the tip and directing it toward the groove. The current-carrying chip according to the present invention, together with the relationship between the guide nozzle that connects the current-carrying chip and the bending wire,
This will be explained with reference to FIGS.

The energizing tip 8 according to the present invention has a cylindrical shape, and the base end portion of the energizing tip 8 connected to the guide nozzle is slightly larger than the bending width L ₁ of the welding wire 7 and has a circular cross section with an inner diameter R ₁ . . For example, R ₁ is about 0.4 to 0.8 mm wider than the bending width L ₁ , and R ₁ ≒ L ₁ +
(0.4 to 0.8). On the other hand, the tip on the welding groove side has a circular cross section with an inner diameter slightly smaller than the bending width _L1 . The inner diameter is, for example, approximately less than the bending width L ₁
It is sufficient to reduce the size by about 0.2 to 0.4 mm. Furthermore, the length T in the axial direction of the tip is made shorter than 1/2 (=P ₀ ) of the bending pitch P ₁ so that the bent welding wire 7 can pass through the tip which is narrower than the bending width L ₁ . In this case, for example, P ₀ ≈T+(0.2 to 0.3) may be used. The tip and base ends of the current-carrying tip 8 have an inclination angle θ so that the welding wire 7 can pass smoothly.
It is formed continuously and integrally. Note that in order to connect to the guide nozzle 6, a thread is provided on the outer periphery of the base end.

FIG. 4 shows an example in which the current-carrying chip formed as described above is connected to a guide nozzle having a rectangular cross section. When a bent welding wire passes through the guide nozzle, the bending direction of the welding wire is determined by the guide nozzle, and the welding wire is guided to the energizing tip. In the current-carrying tip, the welding wire is guided near the center of the current-carrying tip by a tip having a tapered inner diameter, and projects from there toward the welding groove. Therefore, the bending width of the welding wire is regulated with the origin near the center of the energizing chip as shown by L ₂ , L ₃ , and L ₄ in FIG. 4, and the oscillation width can be controlled with high precision.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional bending welding wire guide mechanism, Fig. 2 is a front view of a bending welding wire, Fig. 3 is a cross-sectional view of the current-carrying chip according to the present invention, and Fig. 4 is a guide nozzle equipped with the present invention. 5, 6 and 7 are cross-sectional explanatory diagrams showing usage examples in which the current-carrying chip is attached.
The figures are cross-sectional views showing the AA cross section, the B-B cross section, and the C-C cross section in FIG. 4, respectively. In the drawing, 7 is a welding wire, 8 is a current-carrying chip,
9 is a guide nozzle.

Claims (1)

[Scope of utility model registration request] In a cylindrical current-carrying tip provided at the tip of a guide nozzle that guides a welding wire that is continuously bent with a certain width and a certain pitch to a welding groove, the base end of the tip that connects to the guide nozzle is connected to the welding wire. The tip has a circular cross-section with an inner diameter slightly larger than the bending width, while the tip toward the welding groove has a circular cross-section with an inner diameter slightly smaller than the bending width, and its axial length is the same as the bending pitch of the welding wire. 1/2
A current-carrying chip characterized by being shorter.