JP3464321B2 - Small-diameter steel wire for arc welding - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel wire for arc welding, and more particularly, to a small-diameter steel wire for arc welding having excellent feedability during welding. . 2. Description of the Related Art Small-diameter steel wires for arc welding tend to be used more frequently with the progress of automation and higher efficiency of welding. , High current welding conditions are being adopted. As a result, the wire feeding speed inevitably increases. Also, depending on the target structure, welding is often performed in narrow areas, and from the point of ease of use in those places, the conduit cable from the feed roller of the wire feeder of the welding machine to the welding torch is used. Are tend to be soft and long to make them easy to use. As described above, when the supply speed of the welding steel wire is increased and the wire is used in a long and easily bendable conduit cable, when the wire passes through the conduit tube in the conduit cable during the wire feeding, a frictional resistance is generated. , Which hinders wire feeding during welding, and causes a problem that the arc becomes unstable and welding cannot be performed. For this reason, small-diameter steel wires for welding have
Various measures have been taken to improve the wire feedability, but none are sufficient, and welding workers are often forced to interrupt welding under severe conditions, such as replacing worn conduit tubes. , Is struggling to respond. [0004] To solve the problem of feedability of a small diameter steel wire for welding, conventionally, for example, Japanese Patent Application Laid-Open No. Sho 55-40068.
Patent No. 5,049,049, an ester consisting of a higher fatty acid and a higher monohydric alcohol, and a steel wire for arc welding coated with a mixture of the ester and MoS ₂ , graphite, etc., or graphite and disulfide described in JP-A-58-184095. There has been proposed a steel wire for arc welding in which a mixture of a solid lubricant such as molybdenum and glass powder is applied to the surface of the steel wire. [0005] However, even in these steel wires for arc welding, the above-mentioned soft and long conduit cable is used, and under severe conditions in which welding is performed under high current conditions, the wire is not formed at the feed roller portion. Slippage causes high frictional resistance in the conduit tube, and the inside of the conduit tube becomes hot due to frictional heat and heat generated by the welding cable wrapping the conduit liner, causing the lubricant on the wire surface to partially melt and agglomerate on the wire surface. The feedability was not satisfactory because the lubricant was not evenly coated. SUMMARY OF THE INVENTION Accordingly, the present invention provides a feed roller that is free from slippage even when welding is performed under high current conditions using a soft and long conduit cable. An object of the present invention is to provide a small-diameter steel wire for arc welding with low frictional resistance and good feedability. That is, the gist of the present invention resides in that one or two kinds of molybdenum disulfide and tungsten disulfide are added to the surface of a steel wire for arc welding at 3 to 30 wt%, Fatty acids of 50 ° C or higher, one of fatty acids
Of monohydric or dihydric alcohol and petroleum wax
20 to 60% by weight of a seed or two or more kinds and 5 to 20% by weight of polyethylene glycol, and the remainder is a lubricant composed of a lubricant which is liquid at room temperature and is 0.2 g / kg of wire.
It is characterized by having from 0 to 1.80 g. DETAILED DESCRIPTION OF THE INVENTION One or two types of molybdenum disulfide and tungsten disulfide, a high melting point fatty acid, an ester of a monohydric or dihydric alcohol of a fatty acid, and a petroleum wax are formed on the surface of a steel wire for arc welding. One or two or more of the above, having an appropriate amount of polyethylene glycol and a liquid lubricant, eliminates slippage at the feed roller even under the use of a severe conduit cable and high current conditions, and has a low frictional resistance. The feedability is extremely good. These effects can be achieved by the coexistence effect and synergistic effect of each composition, and the reasons for limiting each composition are described below. First, one or two types of molybdenum disulfide and tungsten disulfide are used in an amount of 3 to 30% by weight. If one or two of molybdenum disulfide and tungsten disulfide is less than 3 wt%, the frictional resistance in the conduit tube increases, and the wire feedability becomes poor. Conversely, if it exceeds 30% by weight, the wire slips at the wire feeding roller portion, causing uneven feeding and making the arc unstable. One or more of fatty acids having a melting point of 50 ° C. or higher, esters of monohydric or dihydric alcohols of fatty acids, and petroleum wax must be 20 to 60% by weight.
These are water repellent and have a rust prevention effect. Further, since it is a solid, molybdenum disulfide and tungsten disulfide can be held uniformly. If the melting point is less than 50 ° C., if the welding is performed for a long time due to the frictional heat of the wire and the heat generated by the welding cable wrapping the conduit liner, the fatty acid, the monovalent or divalent fatty acid in the heated conduit tube is heated.
Esters of polyhydric alcohol and petroleum wax melt on the wire surface and partially coagulate, the lubricant on the wire surface is not uniform, the friction resistance in the conduit tube increases, and the wire feedability becomes poor . On the other hand, if the content is less than 20% by weight, the adhesion of molybdenum disulfide and tungsten disulfide becomes poor. Therefore, the frictional resistance in the conduit tube increases, and the wire feeding property becomes poor. Conversely, if it exceeds 60 wt%, the amount of lubricant on the wire surface is large, and the amount of separation and accumulation in the conduit tube increases, accumulating and increasing the feeding resistance. In addition, the wire is slipped at the wire feeding roller portion and fed. And the wire feedability becomes poor, and the arc becomes unstable. The fatty acids in the present invention are those having a melting point of 50 ° C. or more, such as myristic acid, palmitic acid, stearic acid, and melicic acid, and esters of monohydric or dihydric alcohols of fatty acids are beeswax, carnauba, and the like. It refers to those having a melting point of 50 ° C. or more, such as wax, cotton wax, and synthetic waxes of higher fatty acids. In addition, petroleum wax refers to those having a melting point of 50 ° C. or more obtained by petroleum refining, such as solid paraffin and petrolatum. [0013] Polyethylene glycol is 5 to 20 wt%
Needs to be These are water-soluble whereas fatty acids, esters of monohydric or dihydric alcohols of fatty acids and petroleum wax are water-insoluble,
An ester of a dihydric or dihydric alcohol and a petroleum wax are firmly adhered to the surface of the wire to prevent peeling in the feed roller and the conduit tube. If the polyethylene glycol content is less than 5%, a large amount of water-insoluble components adhere to the wire, which accumulates lubricant in the feed roller portion and the conduit cable, causing the wire to slip at the feed roller portion and cause the conduit cable to slip. The frictional resistance inside becomes large and the arc becomes unstable. If the polyethylene glycol content exceeds 20%, the amount of spatters generated will increase. There are various molecular weights of polyethylene glycol,
In the present invention, those having an average molecular weight of 2000 or more are preferred. [0014] In addition, one or two of molybdenum disulfide and tungsten disulfide on the surface of the steel wire for arc welding.
One or more species of species, fatty acids having a high melting point, esters of monohydric or dihydric alcohols of fatty acids and petroleum wax,
One or more of the metal soaps and the amount of the liquid lubricant should be 0.20 to 1.80 g per 10 kg of wire. If it is less than 0.20 g, the frictional resistance in the conduit tube becomes large, and the wire feeding property becomes poor, so that 1.8
If it exceeds 0 g, the wire slips at the wire feeding roller portion, causing uneven feeding, and the arc becomes unstable. The small-diameter steel wire for arc welding of the present invention refers to a solid wire such as a Si-Mn-based or Si-Mn-Ti-based wire specified in JIS Z3312, or a flux-cored wire specified in JIS Z3313, and has a diameter of 0.8. It is a small-diameter wire of about 2.0 mm. Hereinafter, the present invention will be described in more detail by way of examples. First, molybdenum disulfide and tungsten disulfide on the surface of the steel wire for arc welding, fatty acids,
YGW11 solid wire and JIS Z specified in JIS Z3312 with a wire diameter of 1.2 to 1.6 mm in which the amount of a polyhydric or dihydric alcohol ester and petroleum wax, polyethylene glycol and liquid lubricant are varied.
A prototype of a YFW24 seamless flux-cored wire (with a flux filling rate of 15%) specified in 3313 was produced.
The apparatus shown in FIG. 1 was used for the investigation of the wire feedability. That is, a loop 2 having a diameter of 150 mm is used to increase the feeding resistance.
6m conduit cable 1 with rotation
The wire drawn from the wire was fed by the feed motor 3 and sent to the torch 4, and 10 kg of each wire was welded. Table 1 shows the welding conditions at that time. [Table 1] The wire feedability was examined by measuring the armature current of the feed motor 3. When the armature current exceeds 3.5 A in the wire feedability, the protruding length of the wire changes and the arc becomes unstable. The slip of the wire at the wire feed roller portion was determined by measuring the peripheral speed of the feed roller and the wire speed at the outlet of the feed roller, and calculating the slip ratio by the following equation. When the slip ratio of the wire exceeds 5%, the wire feeding speed becomes slow, and the arc becomes unstable due to uneven feeding of the wire, and the amount of spatter generated increases. Slip ratio = (peripheral speed of feed roller) − (wire speed at feed roller outlet side) / (peripheral speed of feed roller) × 100 The results are shown in Table 2. [Table 2] In Table 2, Test No. 1 to 5 are small-diameter steel wires for arc welding according to the present invention. 6 to 14 are comparative examples. Test No. of the present invention example. The samples Nos. 1 to 5 were very satisfactory because the slip ratio during welding and the armature current of the feed motor were low and the arc was stable. In the comparative examples, Test No. In Test No. 6, the total amount of molybdenum disulfide and tungsten disulfide was large. 9 is a fatty acid,
The total amount of esters of fatty acid monohydric or dihydric alcohol and petroleum wax was large. Sample No. 13 had a high lubricant content per 10 kg of wire, so the slip ratio was high during welding and the arc was unstable. Test No. Test No. 7 has a small total amount of molybdenum disulfide and tungsten disulfide.
Test No. 8 has low melting point of fatty acid, ester of fatty acid monohydric or dihydric alcohol, and lanolin which is one kind of petroleum wax. Test No. 10 has a small amount of fatty acids, esters of monohydric or dihydric alcohols of fatty acids, and petroleum wax. In No. 14, since the lubricant content per 10 kg of wire was low, the frictional resistance of the wire in the conduit tube was increased, the armature current of the feed motor was increased, and the arc was unstable. Test No. Sample No. 11 had a large amount of spatter due to a large amount of polyethylene glycol. Test N
o. In No. 12, since the amount of polyethylene glycol was small, the slip ratio during welding increased, the frictional resistance of the wire in the conduit tube increased, the armature current of the feed motor increased, and the arc was unstable. As described above in detail, according to the thin steel wire for arc welding of the present invention, when a soft and long conduit cable is used and welding is performed under high current conditions. In addition, the feed roller has good feedability such as no slippage and low frictional resistance, and enables welding with stable arc.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a welding device used in an embodiment of the present invention. [Description of Signs] 1 Conduit cable 2 Spool 3 Feed motor 4 Torch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C10M 129: 26 C10M 129: 68 129: 68 145: 28 145: 28 159: 06 159: 06) C10N 10:12 C10N 10:12 20:00 A 20:00 30:00 Z 30:00 30:06 30:06 40:32 40:32 50:02 50:02 (56) References JP-A-55-40068 (JP, A) JP-A JP-A-7-136796 (JP, A) JP-A-58-184095 (JP, A) JP-A-6-285677 (JP, A) JP-A-8-229697 (JP, A) JP-A-8-257788 (JP , A) JP-A-9-70691 (JP, A) Patent 3241522 (JP, B2) Patent 3401344 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 35/36 B23K 35 / 02 C10M 103/06 C10M 105/22-105/48 C10M 107/34 C10M 109/00 C10M 111/04-111/06 C10M 129/26-129/84 C10M 145/26-145/38 C10M 159/06 C10N 10:12 C10N 20:00 C10N 30:00 C10N 3 0:06 C10N 40:32 C10N 50:02

Claims (1)

(57) [Claim 1] One or two kinds of molybdenum disulfide and tungsten disulfide are coated on the surface of a steel wire for arc welding.
20 to 60 wt% of fatty acid, ester of fatty acid monohydric or dihydric alcohol and petroleum wax of 20 to 60 wt%, polyethylene glycol of 5 to 20 wt%, the remainder being liquid at room temperature 0.20 per 10 kg of wire
A small-diameter steel wire for arc welding characterized by having a weight of 1.80 g.