JPH10272576A - Conduit tube for feeding wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide excellent welding workability by providing a clearance at a spiral part of a spring corner of a conduit tube for the gas-shielded metal arc welding to reduce the wire feeding resistance and to smooth the wire feedability. SOLUTION: A clearance W is provided at a spiral part of a spring coil liner 5 of a conduit tube to be used for the gas-shielded metal arc welding. The clearance W of the spring coil liner is 2.0<=W<=15 mm, and the angle θof the spiral part is preferably θ<=70 deg.. When the spring coil liner 5 is used, the friction resistance in feeding the wire is reduced, and the wire is smoothly fed, and the stability of the arc is secured and a sound weld zone can be obtained. The spring coil liner 5 is difficult to generate the blinding condition with impurities, and the clearance W of the spring coil liner can be easily cleaned, ensuring the long-term service.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shielded arc welding tube (hereinafter referred to as a "conduit tube") which is capable of improving wire stability and improving arc stability in gas shielded arc welding. Abbreviated).

[0002]

2. Description of the Related Art In recent years, the demand for gas-shielded arc welding is widely used in the automobile industry, the construction machine industry, and the like, and there is an increasing trend toward automation and unmanned welding. Further, higher efficiency and higher quality are required, and the quality of weldability is also strictly required in gas shielded arc welding. Factors that affect the weldability include the welding material and welding conditions as well as the welding condition, and their selection and management are important.

[0003] The wire diameter used for gas shielded arc welding is often 0.9 to 2.0 mmφ, and in order to ensure good weldability, how to stabilize the wire feedability is as follows.
It is one technology, and its feedability is the material, diameter, coil liner of the conduit tube for feeding wire.
It depends on the form of use.

In general, the material of the spring coil liner 5 of the conduit tube 2 for gas shielded arc welding for guiding a welding wire is a steel for wear resistance or a hard-plated spring, and the inner diameter of the coil liner is 2 to 2. The one of about 5 mm is applied. FIG. 3 shows the structure,
Spring coil liner 5 wound in a coil shape
There is a structure in which a stranded wire 4 made of steel is provided on the outer peripheral side to maintain the rigidity of the entire conduit tube, or a structure in which the spring coil liner 5 is directly covered with the rubber tube 3. In any case, the spring coil liner 5 has a structure that can be pulled out and removed.

FIG. 1 shows a case of semi-automatic welding using a small amount of wound wire. A conduit tube 2 of a guide member for guiding a wire from a welding wire feeder 7 to a welding torch 8 is in a bent state and a torch. Is frequently used while the conduit tube is not fixed while moving frequently.

FIG. 2 shows the case of automatic welding. In an automatic welding line for the purpose of improving the welding efficiency, a wire for gas shielded arc welding with an increasingly larger capacity is used. The large pack wound wire 6 corresponding to it has become mainstream, and the conduit tube 2 has also become longer. For this reason,
As the contact area between the wire and the spiral portion of the coil liner in the conduit tube increases, the frictional resistance increases, causing unstable wire feedability and adversely affecting the arc weldability.

[0007] Further, in a normal gas shielded arc welding wire, lubricating oil or the like is applied to the surface of the wire in order to improve rust resistance and feedability. In order to ensure rust resistance and electrical conductivity, the plated copper is rubbed and peeled off inside the spring coil liner, becoming copper powder and clogging the gap between the spiral portions of the spring coil liner. For this reason, the feed resistance is increased and the feedability is deteriorated,
The wire feedability became unstable, and as a result, the arc of welding became unstable, causing problems such as uneven welding beads and the generation of welding defects.

[0008] From these, productivity has been greatly reduced due to an increase in repair welding, etc., which has led to an increase in cost and a reduction in the quality of the welded portion. Until now, regarding the welded wire feeding conduit tube,
Japanese Patent Publication No. 37564 proposes a configuration in which the material of the conduit tube is different, but does not take into consideration the manufacturing cost and the like. In addition, 2-9796
Japanese Patent Publication No. 9 proposes a conduit tube for gas metal arc welding, and proposes to increase the inner diameter of the conduit tube. However, there is a concern that weight reduction cannot be achieved.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art, to reduce the wire feedability load resistance by improving the spring coil liner structure of the conduit tube, and to reduce the wire resistance. An object of the present invention is to provide good welding workability by making the feedability smooth.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a spring tube liner of a conduit tube used for welding by generating an arc in a shield gas using a consumable electrode. The spiral portion has a structure in which a gap is provided, and the spiral portion gap of the spring coil liner member is set to 2.0 ≦ W ≦
The angle is set to 15 mm, and the angle θ of the spiral portion is set to 70 ° or less.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The operation and configuration of a conduit tube according to the present invention will be described with reference to the following drawings while comparing with a conventional conduit tube. FIG. 3 shows a structure of a conventional spring coil liner, and FIG. 4 shows a spring coil liner of the present invention.

When a conventional spring coil liner is used, the contact area between the wire and the inner surface of the coil liner is large, the frictional resistance is increased, the wire feedability becomes unstable, and arc stability cannot be ensured. When the spring coil liner according to the present invention is used, the frictional resistance at the time of wire feeding becomes small and the wire feeding becomes smooth, so that the stability of the arc can be secured and a sound weld can be obtained.

Further, copper powder, lubricant, impurities, etc. generated in the conduit tube during welding may become clogged in the gap between the spring coil liners, but conventionally, removal of clogged impurities, etc. Because cleaning was difficult, the spring coil liner had to be discarded and a new one used. However, in the spring coil liner of the present invention, clogging of impurities and the like is unlikely to occur, and the spring coil liner is easily removed and cleaned in the gap between the spring coil liners, thereby enabling long-term use.

This spring coil liner can be used alone as a guide when feeding a wire, and also used for a conduit tube integrated with an energizing cable or a shielding gas supply hose, such as a semi-automatic welding torch. Is done.

When the gap W of the spiral portion of the spring coil liner member is less than 2.0 mm, the feed resistance did not decrease, the feedability was uneven, and the arc became unstable. If the spiral gap W is more than 15 mm, the wire is twisted and fed, so that the target position of welding is shifted, which causes poor welding. Further, even when the angle θ of the spiral portion exceeds 70 °, the wire fed in the same manner is twisted, so that the welding target position fluctuates and induces welding defects.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spring coil liner according to the present invention was manufactured, and the wire feeding speed when performing bead-on-plate welding using a 1.2 mmφ welding wire under the welding conditions shown in Table 1 was measured by a non-contact laser. The measurement was carried out by a feeding speed device of the system, and the result of the wire feeding speed at that time is shown in FIG. FIG. 6 shows the results of a survey on the feeding speed of a conventional spring coil liner. As a result of comparison, it is clear that the variation in the wire feeding performance according to the present invention is small. However, in the conventional type shown in FIG. 6, the dispersion of the wire feedability is large and the contact resistance is large, so that the feed speed tends to decrease on average compared to the present invention.

[0017]

[Table 1]

Further, even in a severe condition in which the bending radius of the conduit tube is severely bent, good welding can be continued for a long time without inferior wire feedability, and a sound welded portion can be obtained. . When the gap W between the spring coil liner members is ≦ 15 mm and the coil liner angle θ is ≦ 70 °, the fed wire can be sent out of the torch without twisting.

[0019]

The present invention relates to a conduit tube for gas shielded arc welding, in which a gap is provided in a spiral portion of a spring coil liner to reduce a wire feeding load resistance and to improve wire feeding performance. Since welding workability can be secured, repair welding can be reduced and productivity can be reduced, and production costs can be reduced and the quality of welded parts can be stabilized.

[Brief description of the drawings]

FIG. 1 shows a case of semi-automatic welding.

FIG. 2 shows a case of automatic welding.

FIG. 3 is a sectional view showing the structure of a conventional spring coil liner.

FIG. 4 is a sectional view showing the structure of the spring coil liner of the present invention.

FIG. 5: Results of wire feedability survey

FIG. 6: Results of wire feedability survey

[Description of Signs] 1 Welding wire 2 Conduit tube 3 Rubber coating 4 Stranded wire 5 Spring coil liner 6 Pack wound wire 7 Wire feeder 8 Welding torch W Spring coil liner gap θ Spring coil liner angle

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihiko Chiba 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Takuzo Kawamoto 20-1 Shintomi, Futtsu-shi, Chiba New Japan Steel Technology Co., Ltd.

Claims (3)

[Claims] 1. A condensed tube spring coil liner used for welding by generating an arc in a shield gas using a consumable electrode, wherein a gap is provided in a spiral portion of a spring coil liner member. A conduit tube for gas shielded arc welding, characterized in that: 2. The conduit tube for gas shielded arc welding according to claim 1, wherein the gap between the spiral portions of the spring coil liner member is set to 2.0 ≦ W ≦ 15 mm. 3. The conduit tube for gas shielded arc welding according to claim 1, wherein the angle of the spiral portion of the spring coil liner member is set to θ ≦ 70 °.