JP2000343272A - Welding wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve various troubles caused by winding tendency and to realize stable welding by giving a cast having not higher than a specified value of the difference between the max. diameter and the min. diameter to a wire for welding wound as a coil-state with a spool. SOLUTION: To the wire for welding wound as the coil-state with the spool, the cast having <=20 mm difference between the max. diameter and the min. diameter, is given. For giving this cast, the wire for welding, stored to wind around a bobbine 7 after producing, is uncoiled and e.g. the wire is wound at few turns around dancer rollers 8, in which the upper roller 8a is fixed and the lower roller 8b is free, and further, after winding at about one turn around a capstan 9, the wire is passed through straightening roller group 10 and successively, passed through a reforming roller group 11. The winding tension in the spool 2 is held to the constant by passing through this process. The straightening roller group 10 disposes plural rollers as zigzag state and the strain leaving in the wire after producing, is removed. The desired cast is given to the wire by passing through the reforming roller group 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to welding for use in automatic welding in which a consumable electrode wire for arc welding, particularly a welding wire wound in a coil shape is unwound and continuously fed by a feed roller. Related to wires.

[0002]

2. Description of the Related Art Arc welding performed using a welding wire is roughly classified into automatic welding performed using a traveling vehicle or a robot and semi-automatic welding performed manually. In either case, as shown in FIG. 1, a welding wire 1 serving as a consumable electrode is unwound by a feed roller 3 from a state of being wound up in a coil shape on a spool 2, and is fed by a conduit tube 4. Then, it passes through the inside of the current-carrying chip 5 and is sent out from the tip of the current-carrying chip 5 to the welding portion.

As described above, in order to use the welding wire 1 for automatic welding or semi-automatic welding, it is necessary to wind the welding wire 1 around a spool 2 in advance and attach the spool 2 to a welding machine. Here, the welding wire 1 wound around the spool 2 is cast so that the welding wire 1 is wound neatly in a coil shape on the winding drum of the spool 2, in other words, so as not to collapse. That is, a winding habit is given.

[0004]

By the way, the welding wire 1 unwound from the spool 2 when welding is performed naturally has a winding habit. Therefore, the welding wire 1 passes through the feed roller 3 and the conduit tube 4. Welding wire 1 sent into current-carrying tip 5 and projected from the tip of current-carrying tip 5
Usually arrives at the welded portion with a deviation from the axis l of the current-carrying tip 5, as shown in FIG. In addition, since the strength of the winding habit remaining on the welding wire 1 is uneven in the length direction of the welding wire, the amount of displacement of the welding wire 1 from the axis l changes, and the direction of the displacement does not become uniform. . Then, the orientation of the welding wire 1 derived from the current-carrying tip 5 with respect to the welding portion is disturbed, and the tip of the welding wire swings as the welding proceeds. As a result, the arc point deviates from a predetermined position on the welding line, and welding is often performed out of the original line shown in FIG.
As shown in FIG. 3B, the weld bead 6 meanders.

Further, since the strength of the curl remaining on the welding wire 1 is not uniform in the length direction of the welding wire, when the welding wire 1 is passed through the conduit tube 4, the passing posture of the welding wire 1 is set. Changes in various ways. When the resistance when passing through the conduit tube 4 increases, the feeding speed of the welding wire is reduced, or in the worst case, the feeding itself is hindered, which also adversely affects the formation of the weld bead. Will have an effect.

Accordingly, the present invention is to provide a new welding wire which solves the above-mentioned problems caused by the winding habit by giving the welding wire an appropriate winding habit.

[0007]

That is, the present invention relates to a welding wire wound in a coil on a spool, wherein a cast having a difference between a maximum diameter and a minimum diameter of 20 mm or less is provided. It is a featured welding wire.
The diameter of the cast given to the welding wire is 200 to
Preferably it is in the range of 700 mm.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, in a state where an arbitrary winding of the welding wire 1 wound on a spool is cut from the spool and placed on a flat surface without restraint, FIG.
As shown in, the cast difference between the maximum diameter d ₁ of one turn of the welding wire 1 and the minimum diameter d ₂ is 20mm or less, be imparted over the entire length of the welding wire, it is important.

That is, FIG. 5 shows the relationship between the amount of bending caused by meandering of the weld bead during automatic welding and the difference d ₁ -d ₂ between the maximum cast diameter d ₁ and the minimum cast diameter d ₂ . When the difference d ₁ -d ₂ is 20 mm or less, the amount of bending due to meandering is settled within an allowable range of 1 mm, and it is found that bead meandering cannot be visually observed.

The experiment whose results are shown in FIG.
As shown in FIG. 6, as shown in FIG. 6, when welding wire of mφ was fed and automatic welding of gas shield arc welding was performed under welding conditions of 300 A-30 V and a welding speed of 40 cm / min, as shown in FIG. The maximum bend t was measured and evaluated.

The diameter of the cast applied to the welding wire is preferably in the range of 200 to 700 mm. Because, when the cast diameter is less than 200 mm, the passage resistance of the wire in the conduit tube for guiding the welding wire to the current-carrying tip becomes large, and it becomes difficult to send the welding wire at a constant speed. This is because the welding wire wound around the spool may protrude from the spool and induce winding collapse.

Next, a method for giving a cast according to the present invention to a welding wire will be specifically described.
As shown in FIG. 7, the welding wire wound around the bobbin 7 after manufacturing is unwound from the bobbin 7, and the upper and lower rollers 8
a and 8b, for example, the upper roller 8a is fixed, and the lower roller 8b is wound several times around the free dancer roller 8 and further wound around the capstan 9 once, then the straightening roller group 10, and then the curling roller Group 1
The winding tension in the spool 2 is kept constant by passing through the steps 1 and 2. For example, the tension applied to the welding wire 1 on the exit side of the bobbin 7 is usually 0 to 1
0 kgf, but thereafter, through the dancer roller 8 and the capstan 9, the spool 2
The tension applied to the welding wire 1 on the entry side can be suppressed to, for example, a fluctuation of ± 1 kgf, and can be wound around a spool under a constant tension. Here, the tension applied to the welding wire 1 on the entry side of the spool 2 may be constant within a range of 2 to 7 kgf. As a result, the cast applied to the welding wire 1 becomes almost a perfect circle, and the diameter difference d ₁ -d _{2 of the} cast is suppressed to 20 mm or less.

The straightening roller group 10 includes a plurality of rollers arranged in a zigzag pattern, and a welding wire is passed through these rollers to remove distortion remaining on the manufactured wire. Thereafter, a desired cast is given to the wire by passing the welding wire through the group of rollers 11. Here, in order to control the casting of the welding wire, the curling roller 1 constituting the curling roller group 11 is controlled.
1a, 11b and 11c, the curling roller 11c
As shown in FIG. 8, the casting can be controlled by pressing against the welding wire 1 and adjusting the pressing amount. For example, when the curling roller 11c is raised, the cast becomes smaller, and when it is pressed down, the cast becomes larger.

[0014]

As described above, by using a welding wire provided with an appropriate cast according to the present invention, fluctuation of the arc point and fluctuation of the wire feeding speed during welding are suppressed. Stable welding can be realized.

[Brief description of the drawings]

FIG. 1 is a view showing an automatic welding machine.

FIG. 2 is a diagram showing a displacement of a welding wire with respect to a current-carrying tip.

FIG. 3 is a view showing a shape of a weld bead.

FIG. 4 is a view showing a casting of a welding wire.

FIG. 5 is a graph showing the relationship between the amount of bending due to meandering of a welding bead and the casting of a welding wire.

FIG. 6 is a view showing bending of a weld bead due to meandering.

FIG. 7 is a view showing a step of winding a welding wire around a spool.

FIG. 8 is a diagram illustrating a group of curling rollers.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding wire 2 Spool 3 Feeding roller 4 Conduit tube 5 Current supply tip 6 Welding bead 7 Bobbin 8 Dancer roller 9 Capstan 10 Straightening roller group 11 Curling roller group

Claims (2)

[Claims] 1. A welding wire wound in a coil on a spool, wherein a difference between a maximum diameter and a minimum diameter is 2 mm.
A welding wire provided with a cast of 0 mm or less. 2. The method according to claim 1, wherein the diameter of the cast is 2
A welding wire having a size of from 00 to 700 mm.