JPH09206987A - Seamed flux cored small diameter wire for arc welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the seamed flux cored small diameter wire for arc welding having good feedability and capable of welding with stabilized arc for long time when a soft and long conduit cable is used as bent. SOLUTION: The wire has, on the surface of the seamed flux cored small diameter wire for arc welding, 0.20-1.80g per 10kg wire of a lubricant having a composition consisting of 20-50% one or >=2 kinds among graphite, molybudenum disulfide and tungsten disulfide, 3-40% one or >=2 kinds among fatty acid of >=50 deg.C melting point, monohydric or dihydric alcohol ester of fatty acid and petroleum wax, 0.5-5% one or >=2 kinds among lubricants and the balance an inorganic carrier material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding-flux-containing thin wire for arc welding, more specifically,
The present invention relates to a coiled flux-cored thin wire for arc welding (hereinafter, referred to as flux-cored wire), which has excellent feedability during welding and maintains stable arc and good workability.

[0002]

2. Description of the Related Art Flux-cored wires tend to be used more and more with the progress of automation and higher efficiency of welding. However, depending on the target structure, the welding length may be long or the welding may be performed in narrow spaces. In many cases, from the viewpoint of ease of use in those places, the conduit cable 6 from the feeding roller 4 to the welding torch 5 of the wire feeding device of the welding machine shown in FIG. 2 is flexible and long for easy use. Tends to become. When the conduit cable 6 is long and bent in this way, the frictional resistance increases when the flux-cored wire W passes through the conduit tube in the conduit cable, which hinders the feeding of the wire during welding, causing an arc. Becomes unstable and welding becomes impossible.

On the other hand, in the manufacturing process of the flux-cored wire, since it is a winding type flux-cored wire, when wet drawing, the lubricant penetrates from the seam of the outer cover, so that the wire is drawn dry and wet. However, with metal soaps commonly used in dry wire drawing, lubricant removal treatment (eg,
Since it is necessary to perform a baking process), a wire is drawn with an inorganic or anhydrous lubricant that does not require a lubricant removal treatment, and the inorganic or anhydrous lubricant is applied to the flux-cored wire surface of the product.

To solve the problem of the feedability of the flux-cored wire, for example, Japanese Patent Publication No. 63-15073 has been proposed.
Japanese Patent Laid-Open Publication No. Hei 5-23731, in which a solid lubricant such as graphite, molybdenum disulfide, or glass powder is mixed and applied to the surface of a flux-cored wire.
Various flux-cored wires, such as wire drawing with a lubricant made of polytetrafluoroethylene, molybdenum disulfide, graphite or the like, and flux-cored wires coated with the lubricant, have been proposed in Japanese Patent Laid-Open Publication No. 2003-242242.

[0005]

However, as described above with respect to these flux-cored wires, when the flexible and long conduit cable is bent and used, the flux-cored wire slips at the wire feeding roller portion. However, the friction resistance in the conduit tube is large, and the lubricant is accumulated in the conduit tube to increase the feeding resistance, resulting in chip clogging. It was Therefore, the present invention provides a winding-up flux-contained thin wire for arc welding, which has good feedability and can perform stable arc welding for a long time even when a flexible and long conduit cable is bent and used. The purpose is to provide.

[0006]

That is, the gist of the present invention is that one or more of graphite, molybdenum disulfide, or tungsten disulfide is added to the surface of a wire having a small diameter and containing flux for arc welding. ~ 50
%, A fatty acid having a melting point of 50 ° C. or more, an ester of a monohydric or dihydric alcohol of a fatty acid, and 3 to 40% of one or more petroleum waxes, and 0.5 to one or two or more lubricants.
It is a thin wire with arc-welding flux for winding, characterized in that it contains 0.2 to 1.80 g of a lubricant composed of an inorganic carrier material per 10 kg of wire. The winding-up flux-containing thin wire for arc welding refers to the flux-containing wire with various seams shown in FIG. In the figure, 1 is an outer skin, 2 is a flux, and 3 is a joint.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION One or more of graphite, molybdenum disulfide or tungsten disulfide, a fatty acid having a melting point of 50 ° C. or more, an ester of a monohydric or dihydric alcohol of a fatty acid, and petroleum wax on the surface of a flux-cored wire. In the case of bending and using a long conduit cable that is soft and contains one or more kinds, and one or more kinds of lubricants, and the balance has an appropriate amount of a lubricant made of an inorganic carrier material. In addition, since there is no slip at the feeding roller portion and the frictional resistance is small, the feeding performance is good, and stable arc welding is possible even for a long time.

These effects can be achieved by the coexistence effect and the synergistic effect of each composition. The reasons for limiting each composition will be described below. First, one kind or two or more kinds of graphite, molybdenum disulfide or tungsten disulfide is set to 20 to 50%. Graphite,
If the content of one or more of molybdenum disulfide and tungsten disulfide is less than 20%, the frictional resistance in the conduit tube becomes large, resulting in poor wire feedability. On the other hand, if it exceeds 50%, the wire is slipped in the wire feeding unit and the feeding is uneven, and the arc becomes unstable.

The fatty acid having a melting point of 50 ° C. or higher, the ester of a monohydric or dihydric alcohol of the fatty acid, and one or more petroleum waxes must be 3 to 40%. These are water-repellent, have a rust-preventing effect on a winding type flux-cored wire whose surface is not plated, and prevent the flux filled from the joint from absorbing moisture. In addition, graphite, molybdenum disulfide, or tungsten disulfide can be uniformly held. When the melting point is less than 50 ° C., the fatty acid, the monohydric or dihydric alcohol of the fatty acid is heated in the conduit tube when the welding is performed for a long time due to the frictional heat of the flux-cored wire and the heat of the welding cable wrapping the conduit cable. Of the ester and petroleum wax melt on the surface of the flux-cored wire and partially agglomerate, the lubricant on the surface of the flux-cored wire is not uniform, and the friction resistance in the conduit tube increases and the wire feedability increases. It becomes defective.

If it is less than 3%, the adhesion of graphite, molybdenum disulfide or tungsten disulfide will be poor. Therefore, the frictional resistance in the conduit tube becomes large, and the wire feedability becomes poor. Conversely 4
If it exceeds 0%, it is peeled off in the conduit tube and accumulated, and when it is welded for a long time, the feeding resistance is large, and the wire slips at the wire feeding roller portion to cause uneven feeding, and the arc becomes unstable.

The term "fatty acid" as used in the present application means myristic acid, palmitic acid, stearic acid, melissic acid and the like having a melting point of 50 ° C. or higher, and is a fatty acid monohydric or dihydric alcohol ester, carnauba wax. , Waxes such as cotton wax and synthetic waxes of higher fatty acids, and those having a melting point of 50 ° C. or higher. Petroleum wax refers to those having a melting point of 50 ° C. or higher obtained by refining petroleum, such as solid paraffin and betrolatum.

[0012] One or more lubricants are 0.5 to 5%
Needs to be These further reduce the wire feeding resistance in the conduit tube without promoting slipping of the wire at the feeding roller portion during welding. If one kind or two or more kinds of lubricants is less than 0.5%, it is not effective, and if more than 5%, the lubricant is accumulated in the conduit tube to increase frictional resistance and the arc becomes unstable.

The term "lubricant" as used herein means talc, mica, sericite, etc., and is preferably a fine powder of 74 μm or less. The balance refers to inorganic carrier materials such as carbonates, metal oxides, silicic acid compounds, and fluorides.
One or more of graphite, molybdenum disulfide or tungsten disulfide, a fatty acid having a melting point of 50 ° C. or higher, an ester of a monohydric or dihydric alcohol of fatty acid, and one or more of petroleum wax, and a lubricant. The amount of one or more types is adjusted, but starch having a diameter of 105 μm or less is preferable.

Further, one or more of graphite, molybdenum disulfide or tungsten disulfide on the surface of the flux-cored wire, a fatty acid having a melting point of 50 ° C. or higher, an ester of a monohydric or dihydric alcohol of fatty acid, and one of petroleum wax. Alternatively, the amount of two or more kinds, one or more kinds of lubricants and the inorganic carrier material needs to be 0.20 to 1.80 g per 10 kg of the wire. If it is less than 0.20 g, the friction resistance is large in the conduit tube and the wire feeding property is poor. If it exceeds 1.80 g, the wire is slipped at the wire feeding roller portion and uneven feeding occurs, resulting in an arc failure. Be stable.

[0015]

The present invention will be described in more detail with reference to the following examples. First, JIS with a wire diameter of 1.2 to 1.6 mm
Figure 1 of YFW-C50DR specified in Z3313
Graphite, molybdenum disulfide, tungsten disulfide, fatty acids, monohydric or dihydric alcohol esters of fatty acids, petroleum wax, lubricants and inorganic substances are formed on the surface of the flux-cored wire having a cross section shown in (c) (flux filling rate 15%). The amount of the carrier material of the system was variously changed and used as a wire-drawing lubricant, and coating was carried out. The coating amount was adjusted by changing the wire area reduction rate during wire drawing. The apparatus shown in FIG. 2 was used for the investigation of wire feedability. That is, the flux-cored wire W drawn from the spool (not shown) is fed to the 6 m conduit cable 6 by the feeding roller 4 to feed the torch 5.
And 10 kg of each flux-cored wire was welded.
The conduit cable 6 was provided with two rotations of a loop having a diameter D of 150 mm shown in FIG. 3 for the purpose of increasing the feeding resistance.
Table 1 shows the welding conditions at that time.

[0016]

[Table 1]

Wire feedability was investigated by measuring the armature current of the feed motor. Regarding the wire feedability, when the armature current exceeds 3.5 A, the arc length changes and the arc becomes unstable. For slipping of the flux-cored wire at the wire feeding roller portion, the circumferential speed (TG) of the feeding roller and the passing speed (PG) of the flux-cored wire are measured by installing the measuring roller 7 on the welding torch 5. The slip ratio was calculated by the following formula and examined. When the slip ratio of the flux-cored wire exceeds 5%, the wire feeding speed is moderated, and the arc becomes unstable due to the uneven feeding of the flux-cored wire, and the amount of spatter is increased. Slip rate = (TG-PG) 100 / TG The results are summarized in Table 2.

[0018]

[Table 2]

In Table 2, the test No. Nos. 1 to 8 are flux-cored wires of the present invention, and test No. 9 to 17 are comparative examples. Test No. of the present invention example. 1 to 8 are one or more of graphite, molybdenum disulfide, or tungsten disulfide on the surface of the flux-cored wire, and have a melting point of 50.
A fatty acid having a temperature of ℃ or higher, a monohydric or dihydric alcohol ester of fatty acid and one or more petroleum waxes, one or more lube lubricants, and the remainder a lubricant comprising an inorganic carrier material Since it has an appropriate amount, there is little slippage at the feed roller portion, and there is little frictional resistance, so the feedability is good, and stable arc welding for a long time was possible.

Comparative Example Test No. 9 is graphite,
Since the total amount of one kind or two or more kinds of molybdenum disulfide or tungsten disulfide is small, the test No. 11 is
Since the melting point of fatty acids, esters of monohydric or dihydric alcohols of fatty acids, and lanolin, which is one of petroleum waxes, is low, test No. No. 12 has a small total amount of one or more fatty acids having a melting point of 50 ° C. or higher, esters of fatty acid monohydric or dihydric alcohols, and petroleum waxes.
o. Test No. 14 has a small total amount of one kind or two or more kinds of lubricants, and therefore, Test No. No. 15 was too large in the total amount of one kind or two or more kinds of lubricants, so test No. 16 is the wire 1
Since the amount of lubricant per 0 kg was small, the friction resistance of the wire increased in the conduit tube, the armature current of the feed motor increased, and the arc was unstable.

Test No. Test No. 10 has a large total amount of one or more of graphite, molybdenum disulfide, or tungsten disulfide. In No. 17, since the amount of lubricant per 10 kg of wire was large, the slip ratio became high during welding and the arc was unstable. Test No. 13 is a fatty acid having a melting point of 50 ° C. or higher, 1 of fatty acids
Of dihydric or dihydric alcohols and petroleum wax 1
Since the total amount of one or more types is large, it peels off and accumulates in the conduit tube, resulting in a large feed resistance. Also, the wire feed roller part causes the wire to slip and the feed to be uneven, resulting in an unstable arc. Met.

[0022]

As described in detail above, according to the winding wire containing arc-welding flux for arc welding of the present invention, a flexible and long conduit cable is used. It is possible to perform welding with stable feedability such as less slippage and less frictional resistance at the feed roller.

[Brief description of drawings]

FIG. 1 is a diagram showing a cross-sectional shape of a winding-flux-containing small-diameter wire for arc welding.

FIG. 2 is a diagram showing a wire feeding process.

FIG. 3 is a diagram showing a bending load state of a conduit cable used in an example of the present invention.

[Explanation of symbols]

 1 Outer skin 2 Flux 3 Joint 4 Feed roller 5 Welding torch 6 Conduit cable 7 Measuring roller W Flux-cored wire

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C10M 103: 00 103: 06 129: 26 129: 68 159: 06 125: 30) C10N 10:12 40 : 32 (72) Inventor Seiji Inoue 7-6-1, Higashi Narashino, Narashino, Chiba Narashino Factory, Nittetsu Welding Industry Co., Ltd.

Claims (1)

[Claims] 1. A graphite wire, molybdenum disulfide, or tungsten disulfide, which may be used alone or in combination of two or more, in an amount of 20 to 50 on the surface of a small diameter wire containing a winding flux for arc welding.
%, A fatty acid having a melting point of 50 ° C. or more, an ester of a monohydric or dihydric alcohol of a fatty acid, and 3 to 40% of one or more petroleum waxes, and 0.5 to one or two or more lubricants.
A small-diameter wire with arc-welding flux for arc welding, characterized in that it contains 0.2 to 1.80 g of a lubricant comprising an inorganic carrier material in an amount of ˜5% per 10 kg of the wire.