JPH05261539A - Wire for welding - Google Patents

Abstract

PURPOSE:To reduce the swinging width of a wire, the rocking of arc point and the fluctuation of supplying speed by regulating the cast pitch between two adjacent coils of spool-wound welding wire to be equal or less than a specific value. CONSTITUTION:The cast pitch between arbitrary two adjacent coils of a spool- wound welding wire 1 wound such as a multiple layered coil state is confined to <=150mm. Thus, the swinging of the coils from the bottom layer to the uppermost layer is fixed to the minimum value. Consequently, the arc point rocks little and the supplying speed becomes stable. The torch resisting feeling in a semiautomatic welding is reduced and stable welding is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a consumable electrode for arc welding, and more particularly to a spool winding welding wire wound in multiple layers in a coil shape.

[0002]

2. Description of the Related Art For welding work performed using a wire, a traveling carriage or a robot is used to unwind a welding wire wound in a coil and continuously feed it with a feeding roller. There are two types of automatic welding, one is semi-automatic welding and the other is manual welding. In any welding form,
The welding wire as a consumable electrode is sequentially unwound from a coiled state, and is passed through the conduit tube and the energizing tip hole with a wire feeding roller,
It is fed from the tip of the tip to a predetermined position of the weld.

The method of winding the coil of the welding wire includes alignment winding, twill winding, random winding, and the coil winding shape includes coil winding, rim winding, spool winding, and drum winding.

[0004]

The coil winding welding wire described above remains unwound in the unwound state, and the degree thereof varies depending on the position of the wire. Therefore, as shown in FIG. The directional direction of the derived wire 1 changes, and the runout γ of the wire changes as welding progresses.
The steeper the change in the degree of winding of the wire, the more rapid the fluctuation of the deflection γ, and the arc point often deviates from a predetermined portion on the welding line.

Further, since the wire in the conduit tube is slightly distorted due to the degree of curling, the wire feeding speed also changes with time. The change in the wire feed rate causes the arc point to swing and impairs the stability of the arc. Further, in the semi-automatic welding, a change in the wire feeding resistance causes a feeling of resistance in the hand of the operator holding the welding torch, and the welding workability is significantly reduced.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and provides a welding wire in which the runout width of the wire led out from the current-carrying tip is reduced. It means that the cast pitch of any two adjacent loops of the spool winding wire to be wound on is less than 150 mm.

[0007]

1 is an explanatory view of the cast pitch of the welding wire, D is the cast diameter, which is the diameter of the wire ring in the free state when the wire 1 is released from the coil-shaped restraint,
P is a cast pitch, which is a pitch between two adjacent wire rings in a free state when the wire is released from the coil-shaped restraint.

[0008] The cast pitch P of a normal spool winding wire varies depending on each wire ring and is generally irregular and irregular from the beginning to the end of winding as shown in FIG. The larger the cast pitch of each of the coils, the more pronounced the above-mentioned adverse effects due to winding. In the conventional welding wire, the cast pitch width of two adjacent wire rings is 180-300mm
However, the stability of welding work was impaired.

According to the experiments conducted by the inventors of the present invention, by adjusting the cast pitch of any two adjacent wire rings to 150 mm or less, the fluctuation of the wire runout γ and the fluctuation of the arc point are hardly caused. It has been found that the feeding speed is stable and the unpleasant feeding resistance feeling in the semi-automatic welding can be remarkably alleviated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 4A is a structural view of an example of a welding wire rewinding device, and FIG. 4B is a detailed view of the spool of the winder shown in FIG. 4A. In the drawing, reference numeral 1 denotes a welding wire, which is supplied with a wire having a cast diameter D and a cast pitch P already provided to a supply 3, and is continuously wound around a winder 5 through a washing machine 4. The winding machine 5 is shown in FIG.
By rotating in the direction of the arrow (B), the spool 6 is rewound without changing the cast diameter D and the cast pitch P of the welding wire 1.

Table 1 shows the measurement results of the cast pitch and the deflection γ of the wire from the tip of the welding machine tip according to the present invention. Each supply wire has a wire diameter of 1.2 mmφ and a weight of 5 to 10
It is a kg spool coil. The upper, middle, and lower layers of the wire runout are the fluctuation range of wire runout γ at the winding start, middle, and end of each coil, and the maximum width is left and right around the welding line from the beginning to the end of winding of one coil. The maximum value of the swing width of is shown. The deflection of the wire was measured by pulling out the wire from the tip hole using the torch shown in FIG. 2 and measuring the value of the deviation γ from the welding center at the position of distance l = 150 mm from the tip of the tip. ..

[0012]

[Table 1]

As shown in Table 1, the conventional wire (No. 1)
~ No. In the case of 5), the maximum cast pitch of the two wheels exceeds 150 mm, and the No. with the smallest fluctuation value. One wire is about 180 mm, while the wire of the present invention (No. 6 to No. 10) has the largest No. No. 6 is less than 150 mm. Comparing the deflection γ of the wire when actually welding using this,
With the conventional wire, the runout γ is large and unstable until the coil moves from the lower layer to the upper layer.
On the other hand, the wire of the present invention shows a substantially constant value in each layer, while the maximum width of the entire coil is stable at about 20 mm or less.

It was also confirmed that in the actual welding work, by using the wire of the present invention, stable welding work can be performed without fluctuations in the arc point, feeling of torch resistance, and fluctuations in the wire feeding speed.

[0015]

As described above, according to the welding wire of the present invention, the swing width of the wire is reduced, the fluctuation of the arc point and the fluctuation of the feeding speed are small, and the wire feeding is performed in the semi-automatic welding. The torch resistance at the time is reduced, and stable welding can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a cast pitch of a welding wire.

FIG. 2 is an explanatory diagram of deflection of a welding wire.

FIG. 3 is a diagram showing variations in a cast pitch of a coil winding wire.

4A is a configuration diagram of an example of a welding wire rewinding device, and FIG. 4B is a detailed view of a spool of the winder of FIG. 4A.

[Explanation of symbols]

 1 Welding wire 2 Current-carrying tip 6 Spool

Claims (1)

[Claims] 1. A welding wire, characterized in that any two adjacent windings of the spool winding welding wire wound in multiple layers in a coil shape have a cast pitch of 150 mm or less.