JPH01321091A - Wire for welding - Google Patents

Abstract

PURPOSE:To provide the wire having the good stability of droplet transfer by applying an aluminum plating layer on a stock wire and providing a porous film on the surface of this plating layer, then impregnating a lubricating oil contg. the fine powder of an alkali metal into the fine pores of this film. CONSTITUTION:The stock wire is pickled in a pickling cell 6 contg. hydrochloric acid and is rinsed with a water spray 7; thereafter, the stock wire is passed through an aluminum plating cell 8 and is thereby plated with aluminum. The wire is then drawn by a drawing machine 9 and is coiled to a coil 10. After the wire is passed through a degreasing cell 11 and is degreased, the wire is passed through an oxalic acid bath of a prescribed temp. and prescribed concn. in an anodic oxidation cell 12, by which the wire is anodized at the prescribed voltage and current density. This wire is passed through a heated water tank 13 where the wire is rinsed with the hot water; thereafter, the wire is dried by a heater 14 and is subjected to drawing by a skin pass drawing device 15. The lubricating oil (vegetable oil) mixed with the fine powder of lithium carbonate as the alkali metal is impregnated therein so that the wire is finished to the product. The wire which has the good stability of the droplet transfer and good wire feedability is obtd. in this way.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a welding wire with excellent workability, in particular a welding wire with stable transfer of droplets during carbon dioxide encapsulated welding, and a so-called spray-like arc. The present invention relates to a welding wire that can obtain the following properties.

(Prior art) Conventionally, in order to stabilize the transfer of droplets during carbon dioxide gas encapsulation welding using carbon dioxide gas or other inert gas as a shielding gas, and to obtain a so-called spray arc, a coating such as C3 was applied to the wire surface. It is known to apply oxides of alkali metals.

(Problem to be Solved by the Invention) However, in the conventional technology, it is said that it is difficult to apply an alkali metal oxide to the surface of a welding wire and ensure that it adheres to the surface of the wire. Because it is flat, it does not have sufficient alkali metal oxide retention ability, and there is a big problem with the uniformity of the amount of coating, and the applied alkali metal oxide only adheres to the wire surface. , during wire feeding, it may peel off from the wire surface and adhere to the spring liner.

In addition, the distance from the power supply tip to the tip of the welding wire is generally 1
There is a problem that there is a distance of 0+nm or more, and the alkali metal oxide adhering to the surface is vaporized by heating during this time, making it useless for improving welding workability.

An object of the present invention is to provide a welding wire with good feedability that allows stable transfer of droplets during welding and allows a so-called spray-like arc to be obtained.

(Means for Solving the Problems) As shown in FIG. 1, a welding wire according to the present invention has an aluminized layer 2 covering a wire strand 1, and has numerous fine particles on the surface of the aluminized layer 2. A porous coating 4 having pores 3 is provided, and the micropores 3 of this porous coating 4 are impregnated with lubricating oil containing fine powder of alkali metal.

According to the present invention, the countless micropores on the aluminum plating surface have a pore diameter of about 50 to 400 as obtained by anodizing treatment, and the number of pores per square inch is (1 to 1000).
) It is preferable to set it to about XIO'.

In addition, in the welding wire manufacturing method according to the present invention, after aluminizing the wire surface, anodizing is performed to form countless micropores on the aluminized surface, and lubricating oil containing fine alkali metal powder is applied to the aluminized surface. It is characterized by impregnation into micropores.

(Function) According to the present invention, the porous film 4 provided on the surface of the aluminum plating layer 20 by, for example, anodizing treatment has micropores 3 with a pore size of about 50 to 400 per square inch (for example). 1 to 1000) There are an infinite number of XIO' pieces,
Since these micropores are impregnated with lubricating oil containing fine powder of alkali metal oxide, the surface is coated more uniformly with lubricating oil containing alkali metal oxide than if the alkali metal oxide was applied only to the surface. Moreover, a stable product with less adhesion to the spring liner during wire feeding can be obtained. In addition, compared to those that adhere only to the surface, the alkali metal is impregnated within the very fine pores, so
There is little vaporization at the wire protrusion, and since the alkali metal is effectively contained in the arc, it can be reliably sprayed.

Conventionally, aluminizing the surface of welding wire was
For example, as described in Japanese Unexamined Patent Publication No. 13399.9/1980, aluminum plated wire has a disadvantage in that wire feedability during welding is very poor compared to copper plated wire.

However, according to the present invention, such drawbacks of the aluminized wire are overcome, and the welding wire has good feedability due to the lubricating oil coating layer 5 uniformly adhered to the surface of the welding wire.

The above-mentioned anodic oxidation treatment is a process in which a porous film is formed on the aluminum plating layer using an electrolyte such as phosphoric acid, cylinic acid, chromic acid, or sulfuric acid. There are approximately 50 to 400 tubular micropores per square inch (1 to 1000).

The alkali metal oxides impregnated into the above-mentioned micropores according to the present invention are, for example, Cs2O, K, 0. Na2O.

Li and O are preferably used and are mixed with lubricating oil as a fine powder of 74μ or less to be impregnated.

The aluminum plating layer is designed to prevent aluminum oxide from entering the weld metal and causing negative effects during welding.
The thickness shall be 30μ or less.

(Example) Example I JIS Z3312, YGW16 wire strands were pickled in a pickling tank 6 containing hydrochloric acid, rinsed with water spray 7, passed through an aluminization tank 8, and plated with aluminium.
An aluminum plating layer with a plating thickness of 20 μm was formed. Next, the wire was drawn by a wire drawing machine 9 and wound into a coil 10. Next, after being degreased by passing it through a degreasing tank 11, it is passed through 2% sinuic acid at a liquid temperature of 24°C in an anodizing tank 12, anodized at a voltage of 20v1 and a current density of 3 A/am'', and passed through a heating water tank 13. After washing with hot water, drying with a heater 14, and drawing with a skin pass wire drawing machine 15, a lubricating oil (vegetable oil in weight ratio: L12CO3 = 97 :
3) was impregnated into a product with a diameter of 1.2 mm.

Example 2 It was produced under the same conditions as Example 1 except that cesium carbonate (CS2CO3) was used as the alkali metal.

Example 3 Mineral oil as lubricating oil in weight ratio: Mineral oil: Li2CO5
It was produced under the same conditions as in Example 1 except that they were mixed at a ratio of 95:5.

Comparative Example 1 Type of wire strand; JIS 23312, YG 6 (
Wire diameter 1.6m> Pickling: Hydrochloric acid aluminum plating: After plating with a plating thickness of 20μm, diameter 1.2
The wire was drawn to a length of mm and degreased.

Comparative Example 2 ”) Year 9.800 types; JIS 23312, YG
lil16 (wire diameter 1.6 mm) Pickling: After drawing with hydrochloric acid, degreasing and applying vegetable oil (vegetable oil: L12CO3'97
'3) Skin pass wire drawing was performed.

Example 1 above. 2. The welding workability and wire feedability of the welding wires manufactured according to No. 3 and Comparative Example were tested, and the results are shown in Table 1.

Table 1 (Effects of the Invention) According to the present invention, as is clear from Table 1, the stability of droplet transfer is better than that of the conventional one shown as a comparative example.
Furthermore, it is possible to provide a welding wire with good wire feedability and excellent workability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a welding wire according to the present invention, and FIG. 2 is a schematic explanatory diagram showing a wire manufacturing process according to the present invention.

Claims (1)

[Claims] 1. The wire has an aluminum plating layer covering the wire, and a porous film having countless micropores is provided on the surface of the aluminum plating layer, and the micropores of the porous film contain A welding wire characterized in that it is impregnated with lubricating oil containing fine powder of alkali metal. 2. After the wire surface is plated with aluminium, countless micropores are formed on the aluminized surface by anodizing, and the micropores on the aluminized surface are impregnated with lubricating oil containing fine alkali metal powder. A method for manufacturing welding wire.