JPS6350120B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a wire for automatic or semi-automatic welding,
In particular, it relates to a welding wire whose surface is coated with a rust-preventing lubricant. Currently, there are two types of automatic or semi-automatic welding wire: solid wire and composite wire in which welding flux, alloy material, etc. are filled inside a formed steel strip. Wires whose seams are welded or so-called seamless wires whose pipes are filled with flux have been put into practical use. As the automation of various welding operations using these welding wires progresses, various highly efficient welding methods using small diameter wires of 2.4 mmφ or less and using high current density have been developed and put into practical use. In this type of welding, the amount of melted wire increases and the wire feeding speed inevitably increases, which makes it difficult to stably feed the welding wire and stabilize the welding arc, which adversely affects the welding result. It will have a negative impact. In particular, if the conduit tube from the drive wheel for wire feeding to the welding torch is long or bent, resulting in large feeding resistance, this will significantly hinder wire feeding and cause the arc to become unstable. In extreme cases, it may even be impossible to continue welding. Under such current circumstances, various countermeasures have been disclosed and implemented as solutions to the problems with welding wires, but nothing perfect has yet been developed. For example, conventional methods include applying solid lubricants such as graphite or molybdenum disulfide alone or in combination with oils and fats to the wire surface to form a film, or applying esters, metal soaps, etc. alone or in combination with oils and fats. A method has been proposed in which the mixture is mixed and diluted with a solvent such as water, acetone, or alcohol, and then applied. Furthermore, there is a method in which the wire surface is coated with lubricating oil, carboxylic acid amine salt, etc. without metal (copper) plating. ,
A method has been proposed in which the wire surface is coated with zinc dithiophosphate or the like to prevent rust and lubricate the wire surface. However, the wires coated with the various antirust lubricants described above have advantages and disadvantages, and are not perfect. That is, there were problems such as contamination due to solid substances such as molybdenum disulfide, accumulation of anti-rust lubricant within the conduit tube during welding, and deterioration of anti-rust properties due to solvents. Furthermore, if copper plating is not applied, there will be problems with rust prevention and conductivity.
The reality is that actual wires have not yet been put into practical use. The present invention has been made in view of the actual situation of conventional welding wires, and aims to provide a welding wire that satisfies the following conditions. In other words, regarding wire feeding performance, no matter how severe the conditions are during welding, for example, high-speed feeding is required and the conduit tube is
Even if the conduit tube is long (20 m), the welding site is narrow, so it is required to be able to feed the wire stably even when the conduit tube is bent. Regarding rust prevention, it is important that the product can withstand long-term storage in the packaged state and that it will not rust even if left in the field for 1 to 2 weeks after opening the package. If the feedability is good, stable welding can be achieved. When using rusted wire, there is a problem of poor feeding performance, unstable arc, and an increase in the amount of hydrogen in the weld metal due to rust. It can also cause outbreaks. The present invention fully satisfies these requirements for a welding wire with excellent rust prevention and lubricity, and its gist is to provide a copper-plated solid welding wire or a flux-cored seamless welding wire. Apply 0.1 g or more of rust-preventing lubricant based on wool grease, lanolin refined from wool grease, or lanolin derivatives to the surface of the wire per 10 kg of wire.
It is on welding wire coated with 1.0g. The main components of the rust-preventing lubricant used in the present invention are wool grease, lanolin refined from wool grease, and lanolin derivatives, which have substantially the same effects as the main components of the rust-preventing lubricant for welding wires, Can be used alone or in any combination. Wool grease and lanolin are mainly composed of esters of higher fatty acids and higher alcohols. Examples of lanolin derivatives include liquid lanolin, acetylated lanolin, lanolin fatty acid PEG ester, and lanolin alcohol. Unlike other animal and vegetable oils, the alkyl groups of these components rarely have a linear structure.
Most have branched chains. Therefore, the present inventors have discovered that it has various properties not found in other oils and fats, and is most suitable as a rust-preventing lubricant for automatic and semi-automatic welding wires. That is, the wool grease, etc., which is the main component of the coating agent for the wire of the present invention, has an alkyl group that has a lubricating ability related to feedability, which is most important for small diameter wires for welding, and also has a polar group. It is extremely superior because it also has the following. Furthermore, lanolin has good adsorption to metals and has great water-retaining properties, so it blends well with metal surfaces, making it easy to apply and having excellent rust prevention properties. It also has the property of forming a strong film on the surface when left in the air, which is effective in preventing rust. Furthermore, it is important that wool grease, lanolin and lanolin derivatives are non-toxic. For example, lanolin has long been widely used in cosmetics because it is non-toxic to the human body, and it is clear that there are no problems in handling it when applying it to wires. Further, there is no generation of toxic gas during welding, and there are no problems in terms of the working environment. Because of these many excellent properties, it has been revealed that various problems associated with conventional anti-rust lubricants for welding wires can be solved, and effects can be obtained with a significantly smaller amount of application. Next, the usage pattern of the rust-preventing lubricant used in the wire of the present invention will be described. First, when lanolin or the like is used alone, it is easier to apply it in liquid form, and in the case of wax, grease, or solid form, it is diluted with a solvent, mineral oil, neutral oil, etc. before use. In the case of liquid lanolin, etc., these diluents can be added as viscosity modifiers, preferably in a range of about 50% or less, if necessary. Viscosity modifiers for these wool greases, lanolin, and lanolin derivatives include kerosene, spindle oil, machine oil, mineral oil alcohols such as liquid paraffin, solvents such as benzene, toluene, xylene, chlorinated solvents, etc., or solvents with relatively high viscosity. It is best to use neutral oils such as rapeseed oil, lard oil, and palm oil. In addition, the rust-preventive lubricant may contain benzotriazole or benzotriazole derivatives (such as alkylbenzotriazole, benzotriazole,・
(monoethanolamine) up to 5%, preferably
It can be added in a range of 0.5 to 2%. Even if benzotriazole or the like is added in an amount of 5% or more, no further effect can be obtained, and this should be avoided since it not only reduces the effect of the main ingredient but also increases cost. According to the present invention, the method for applying the above-mentioned anti-rust lubricant to the surface of the welding wire may be any conventional method. In other words, there are methods of adhering it by using it as a lubricant during the final skin pass wire drawing during the production of welding wire, or coating the product with rolls, cloth or felt in the previous process when winding it into a spool or a pail pack. . Among these coating methods, apply 0.1g to 1.0g/10g/10kg of wire to the wire surface.
The most preferable method to uniformly apply a small amount of rust-preventing lubricant (Kg) over the entire surface of the wire is to sandwich the running wire between felts impregnated with lanolin, etc., and have a predetermined width and thickness, and then pass a predetermined amount of the wire through. This is a method in which the position where the felt grips the wire is changed by stepwise movement, and coating is always carried out at the new contact position. Next, the present invention will be explained based on examples. First, Table 1 shows formulation examples of rust-preventing lubricants applied to welding wires of the present invention and the results of measuring their viscosity, together with comparative examples. In Table 1, the rust-preventing lubricants for welding wires of the present invention are Nos. 5 to 12, which are mainly composed of wool grease, lanolin, or lanolin derivatives, and suitably contain diluents and anti-discoloration agents. 1~
4 is a comparative example. The method of coating on the wire surface is No. 1, 2, 6, 7,
12 is application using a die during final skin pass wire drawing during manufacturing, No. 4, 9, and 11 are roller application, No. 5, 6,
8 and 10 are felt coating. The welding wire used at this time was a copper-plated copper wire with a wire diameter of 1.2 mm (components: C0.07%, Si0.80%, Mn1.61%).
It is. Table 2 shows the amount of the anti-rust lubricant deposited, and also shows the results of tests on feedability and anti-rust properties for each wire. The wire feedability test was conducted using the same welding machine under the same conditions, and evaluated by the variation range and magnitude of the armature current value of the feed motor due to the load when feeding the wire, and the larger the current value, the better the wire feed rate. On the other hand, the smaller the value, the better. As shown in FIG. 1, the test apparatus includes a welding wire spool 2 mounted on a welding machine 1, and a wire 4 is fed to a welding torch 6 via a wire feed roller 3 and a conduit tube 5, and The test was carried out by sending the steel material 8 along with shielding gas from the base metal to generate an arc, and moving the steel material 8, which is the base material, at a predetermined speed. The conduit tube is 3m long, and there is a 200mmφ tube in the middle.
A turn and a 25mm radius bend were provided. The welding conditions are as follows. Welding current (A) 300 Welding voltage (V) 30 Welding speed (cm/min) 20 Shielding gas CO ₂ flow rate (/min) 20 Wire protrusion length (mm) 25

【table】

[Table] As is clear from Table 2 and Figure 2, the wire of the present invention has a coating amount per 10 kg of wire as shown in Nos. 5 and 8.
Even at 0.14 and 0.19 g, the coating was uniformly applied, and the feedability and rust prevention properties were in the A/A range, which was extremely good. FIG. 2 shows the relationship between the amount of rust-preventing lubricant applied and feedability. In areas where the amount of adhesion is less than 0.1 g per 10 kg of wire, it is difficult to adhere uniformly to the wire surface, resulting in poor feeding. On the other hand, the amount of adhesion is
If you apply more than 1.0g per 10kg, no better effect will be obtained, and dust in the air will easily adhere to it.
As with the solid lubricant of the comparative example, the feedability is adversely affected. In the comparative example, both the feedability and rust prevention properties are poor due to poor adsorption and film-forming properties to metals, and if the amount of adhesion is increased to compensate for this, the effectiveness as a lubricant is inhibited. That is, during long-term use, accumulation within the conduit tube causes poor feeding performance and chip clogging. To summarize the above, according to the present invention, rust prevention

[Table] Automatic or semi-automatic wire coated with wool grease, lanolin, or a lanolin derivative-based lubricant can achieve satisfactory feed performance and rust prevention with an extremely small amount of application, and can be easily welded. The amount of hydrogen in the metal was small and the welding results were very good.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the welding machine used for the feedability test.
FIG. 2 is a diagram showing the relationship between the amount of rust-preventing lubricant deposited and feedability. In Figure 2, the areas marked with ○ and ○ are extremely good, and △
The mark indicates good wire feeding speed, but the wire feeding speed changes, and the cross mark indicates poor feeding performance.

Claims (1)

[Claims] 1 Apply a rust-preventive lubricant containing one or more of wool grease, lanolin, or lanolin derivatives as a main component to the surface of a copper-plated welding wire.
A welding wire characterized by having a coating of 0.1g to 1.0g per kg.