JPS5820717B2 - electric welding wire - Google Patents

Description

[Detailed description of the invention] Concerning improvements in wire used for electric welding.

Conventionally, welding wires have been coated with a thin layer of copper on the outer periphery of the steel core wire by drawing or electroplating to reduce the hydrogen content of the deposited steel.
It is recommended that heat treatment be performed prior to welding, but in this case, the above hydrogen content should be reduced to 1.0 g per 100 g of welded steel.
It was difficult to maintain it below 0CC.

The present invention was made to eliminate these disadvantages, and includes distributing pinholes in the thin metal layer around the outer periphery of a wire with a diameter of 1 to 6 mm at a ratio of 5 to 200 pinholes per 100 wire lengths, and degassing the wire. To provide an electric welding wire characterized in that at least the pinholes are filled with antirust paint after welding.

An embodiment of the present invention will be described with reference to the drawings.

In Figures 1 and 2, 1 is a wire for electric welding, 2 is a steel core wire, and the outer diameter is 3 m - 3 is a thin layer of copper plated on the outer periphery of the core wire 2 by electrolysis, and the thickness is 0.5 m. The pin holes/L/FC of the copper plating layer 3 are distributed over the entire length at a ratio of 10 to 100 microns per 100 mm of the length of the wire 1.

Pinhole detection and judgment conforms to Japanese Industrial Standard JISH8.
The test may be carried out in accordance with the method according to 612-1960 Feroxyl Test.

The number of pinholes 4 can be reduced by adjusting the conditions during electroplating, but the number of pinholes 4 can be reduced by adjusting the conditions during electroplating.
The wire 1 is deaerated by heat treatment at 00° C. for 1 hour, and then the antirust paint 5 is press-fitted into the pinhole A/4, filled and dried.

If the same wire 1 is heat treated as described above, wire 1
The hydrogen content per 00g can be 0.1cc or less.

This wire is used to perform submerged arc welding,
The hydrogen content in the welded steel analyzed according to the provisions of JIS-73113 was 0.08 to 0.20 CC per 100 g.

The number of pinholes 4 is set depending on the cross-sectional area of the core wire 2 and the density of water and elements contained, but the larger the number is, the more effective it is for degassing treatment. Considering these two conditions, the diameter of the core wire is 1 to 61 mm as a practically preferable range since it is desired that it be small.
For rLrIL, it is appropriate to set the number to 5 to 200 per 100 mm.

The copper plating layer 3 adheres well to the outer periphery of the core wire 2 to improve electrical conductivity from the surface to the core wire 2, and also prevents moisture penetration and rusting, making it effective as an electric welding wire. can be increased.

Since the pinholes 4 are evenly distributed over the entire length of the wire 1, most of the hydrogen absorbed by the core wire 2 during the plating of the thin copper layer 3 is quickly removed during the heat treatment described above. The antirust paint filled in the pinhole A prevents moisture from penetrating into the core wire 2 and rust formation, and the performance of the wire 1 will not deteriorate even if left as is after this treatment.

It is effective to mix an appropriate solvent and curing agent with the urethane resin, alkyd resin, etc. that fills the pinhole 4, since the amount of hydrogen generated during welding is small.
The most preferable base material is a urethane-based or alkyd-based resin mixed with an appropriate solvent and curing agent, and a fluorine-containing polymeric substance such as fluorine oil as a dehydrogenating agent or a slag-forming agent. It contains calcium carbonate, calcium oxide fluorite, quartzite, clay, asbestos, ferrosilicone, ferromanganese, etc. as deoxidizers, or a combination of two or more, and according to this, it has a long-term lifespan. In addition to preventing rusting of the welding wire over time, it is also possible to improve weldability in terms of blowholes and pinholes caused by hydrogen and oxygen, mechanical strength, etc. during welding.

In the above embodiment, the thin copper layer 3 was provided on the outer periphery of the core wire 2 by electroplating, but it is also effective to provide a thin copper layer by drawing, in which case the pinhole 4 is formed. It may be provided by electrical discharge machining.

Also, instead of providing a thin layer of copper, other metals such as aluminum may be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic view of one embodiment of the electric welding wire of the present invention, and FIG. 2 is a partially enlarged view of FIG. 1. 1... Wire, 2... Core wire, 3...
... Thin layer of copper plating, 4... Pinhole, 5.
...Filled anti-rust paint.

Claims (1)

[Claims] 1. Distribute pinholes in the thin metal layer around the outer periphery of a wire with a diameter of 1 to 6 mm at a ratio of 5 to 200 pinholes per 11L of wire length, and apply antirust paint to at least the pinholes after degassing treatment. An electric welding wire characterized by being filled.