JPS6138914Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a surface treatment device for welding wire.

For example, when welding in a shielding gas atmosphere such as carbon dioxide gas or argon gas, a relatively small diameter welding wire is fed toward the welding area at a speed of 1 to 20 m/min, and a 50 to 500 A Welding work is performed using welding current, but sometimes the welding wire is not fed smoothly, the arc becomes unstable, the weld bead is not uniform, and it becomes impossible to continue the welding work to a satisfactory level.

In order to avoid such inconveniences, a surface treatment agent such as anti-corrosion lubricant is applied to the surface of the welding wire, thereby making the feeding of the welding wire smooth and improving the surface of the welding wire. It has an anti-rust effect.

Conventionally, as a means of applying rust-preventing lubricating oil to the surface of welding wire, for example, when drawing welding wire to a desired diameter with a wire-drawing die, rust-preventing lubricating oil is used on the wire-drawing die. Then, apply anti-rust lubricant continuously to the surface of the welding wire on the exit side of the wire drawing die, or, for example, as shown in FIG.
A traveling welding wire W is held between felts F impregnated with rust-preventing lubricating oil, and the rust-preventing lubricating oil is continuously applied to the surface of the welding wire W.

With these conventional application means, the amount of oil applied to the welding wire is large immediately after the oil is applied, and the amount of oil applied decreases over time.

For example, in the case of the application means shown in Fig. 1, the supply of anti-rust lubricating oil and the replacement of felt F are performed in batches based on a certain standard, but there are individual differences in the amount of oil applied to felt F and The amount of oil applied to the welding wire W varies depending on the type, thickness, etc. of F.

FIG. 2 shows an example of changes in the amount of coating applied to the welding wire W in the case of the coating means using felt F.

By the way, if variations occur in the amount of coating on the surface of the welding wire, the following problems arise in terms of welding workability.

In other words, if too much oil is applied, the feed roller will slip, causing poor feeding of the welding wire, poor current flow and unstable arc, and increased diffusible hydrogen in the weld metal. There are problems such as welding defects.

In addition, if the amount of oil applied is too low, the feeding resistance of the welding wire inside the conduit tube will increase.
There is a problem of feeding defects.

In view of these conventional problems, the present invention was developed to uniformly apply the required anti-rust lubricant to the surface of welding wire. This will be explained below.

In FIG. 3, 1 is a storage tank for rust-preventing lubricating oil, and an atomization chamber 3 equipped with a required number of spray nozzles 2 with spray ports facing upward is provided in the upper part of this tank 1. There is.

Each of the spray nozzles 2 is provided in a common nozzle header 4, and the rust-preventing lubricant in the tank 1 is supplied to each spray nozzle 2 via a high-pressure pump 5 and the nozzle header 4. Rust-preventing lubricant is sprayed from

Further, in the upper opening of the atomization chamber 3, a demister 6 made of a plurality of overlapping fine mesh wire gauze is installed horizontally, and an electrodeposition chamber 7 is provided above the demister 6. A welding wire W runs through the electrodeposition chamber 7 from the center of the front end to the center of the rear end.

Between the front end and rear end of the electrodeposition chamber 7, a plurality of parallel discharge wires 8 are stretched at equal intervals around the welding wire W that runs through the electrodeposition chamber 7.

A negative high voltage of, for example, 5 to 20 KV from a DC high voltage generator 9 is applied to the plurality of discharge wires 8 .

It is assumed that the welding wire W is grounded, and that the discharge wire 8 is insulated from the electrodeposition chamber 7 by an insulator.

The high-pressure pump 5 supplies the anti-corrosive lubricant in the tank 1 to the spray nozzle 2, and the anti-rust lubricant is sprayed from the nozzle 2, and the atomized anti-rust lubricant in the atomization chamber 3 is sprayed. is made fine by demister 6,
A fine mist of rust-preventing lubricating oil is introduced into the electrodeposition chamber 7 through the demister 6 and is filled therein.

Next, a negative high voltage is applied to the discharge wire 8 in the electrodeposition chamber 7, and a welding wire W is placed in the electrodeposition chamber 7.
(running speed is 1000m/min).

The fine atomized rust preventive lubricant is negatively charged in the electric field between the discharge wire 8 and the welding wire W, and the negatively charged fine atomized rust preventive lubricant is applied to the welding wire W by electrostatic attraction. adheres to the surface of

FIG. 4 shows an example of the amount of oil applied to a welding wire using the device of the present invention.

According to the device of the present invention, it is possible to efficiently and uniformly apply the necessary minimum amount of anti-rust lubricant to the surface of the welding wire without having any negative effect on welding workability, thereby automating the oil application process. It can also greatly contribute to reducing the amount of rust-preventing lubricating oil used.

The casing in the device of the present invention is preferably made of an insulating material such as a synthetic resin material.

Further, as a method for atomizing the rust-preventing lubricating oil, ultrasonic atomization means, electrostatic atomization means, high-pressure pneumatic atomization means, airless pressure atomization means, etc. can be adopted.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional example of a means for applying anti-rust lubricating oil to a welding wire, FIG. 2 is a graph showing an example of changes in the amount of oil applied by the conventional means of FIG. The figure is a perspective view showing an embodiment of the device of the present invention.
FIG. 4 is a graph showing an example of the amount of oil applied by the device of the present invention. 1... Rust-proof lubricant storage tank, 2... Spray nozzle, 3... Atomization chamber, 4... Nozzle header, 5
... High pressure pump, 6 ... Demister, 7 ... Electrodeposition chamber, 8 ... Discharge wire, 9 ... DC high voltage generator,
W...Welding wire.

Claims (1)

[Scope of utility model registration request] An atomization chamber equipped with a nozzle for spraying rust-preventing lubricant and having a demister on the outlet side for atomizing the atomized rust-preventing lubricant into fine particles, and a fine atomized rust-preventing lubricant passing through the demister of this atomization chamber. A welding wire surface treatment process consisting of an electrodeposition chamber in which a grounded welding wire is run through the atmosphere, and a discharge wire is stretched parallel to the welding wire in the atmosphere. Device.