JPS603914B2 - Steel solid wire for welding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding steel solid wire that is not plated with copper or the like.

Generally, welding steel wire used for welding in a shielding gas such as carbon dioxide gas or argon gas has a diameter of 0.8 to 2.
Enemy? A wire with a small diameter, such as , is fed toward the welding area at a speed of 1 to 2 skins per minute, and a welding current of 50 to 500 A is applied to the wire in order to melt the wire and the workpiece. I was welding it. Conventionally, when such welding wires have been used, the tip and wire may be locally fused in the feeder (hereinafter referred to as the tip) hole that supplies welding current to the wire, resulting in failure of wire feeding. It became stable, and the arc was disturbed and it was easy to not be able to perform good welding.

Furthermore, when the arc becomes unstable in this way, the tip is replaced with a new one so that stable welding can be performed again. Conventionally, no other concrete measures have been taken to deal with arc instability other than simply replacing the tip. Also, why does this kind of local fusion between the wire and the tip occur and what can be done to prevent it? I knew what I was going to do, and I didn't know what to do.

The present invention was discovered as a result of various experiments and studies in order to improve these conventional problems. It was determined that the cause of this phenomenon was free metal powder adhering to the wire surface. That is, the inventors found that in the case of copper-plated wire,
Since iron powder and copper powder were observed near the fused part within the chip, soft copper powder was generated due to friction between the wire and the channel wall through which the wire is fed, and some of this was on the wire surface. We assumed that the adhesion was carried to the chip and caused local fusion between the chip and the wire, so we conducted an experiment by making a prototype wire without copper coating to avoid the risk of generating steel powder. However, there were still cases where the chip and the wire were fused together. For this reason, the present inventors continued to investigate and research various causes of this fusion, and as a result, even in bare wire without copper plating, which is usually obtained by general methods, it is necessary to They found that free metal powder was attached to the surface.

In this case, we investigated the relationship between the free metal powder attached to the wire surface and the amount of wire used until the chip and wire were locally fused and the arc was interrupted.
The result is shown in the figure.

As is clear from this figure, when the amount of free metal powder is less than 0.1 ta per 10 k9 of wire, the wire is
9 (1 volume of 20k 9-volume spool) There was no interruption in the arc until the end of use, and the arc continued stably, but...
The amount of metal powder deposited is 0.175 per 10k9 of wire.
．． In the case of 37 pm and 0.88 pm, fusion occurred early and the arc was interrupted. In addition, this wire was cleaned to remove free metal powder, and the remaining amount was 0 per 10 kg of wire.
．． When the experiment was carried out again with the wire used at 1 ta or less, no arc breakage occurred until the amount of wire used was 20k9. These results revealed the following.

'1' If the amount of free metal powder adhering to the wire surface is 0.1 ta or less per 10k9 of wire, the tip and wire will not be fused and welding can be performed stably over a long period of time.

[2- It is better not to have copper plating because the plated copper will not be removed when the wire is in the path.

It became clear that

In addition, since the metal powder adhering to the wire surface is generated during the manufacturing process, when actually producing a wire with an amount of adhering metal powder of 0.1 ta or less per 10 kg of wire as in the present invention, We use a wire drawing lubricant with excellent lubricity to minimize the amount of metal powder generated, and we also use water-soluble and highly washable wire drawing lubricants, such as sodium stearate, to reduce the amount of metal powder generated during the cleaning process after wire drawing. All you have to do is enter the .

In addition, to measure the amount of metal powder, first add a specific amount (
For example, 1 kg), the wire was thoroughly washed to remove free metal powder, and the metal powder was then separated from the cleaning solution and measured, and the amount was calculated based on the amount per 10 kg of wire.

As described above, according to the steel solid wire for welding of the present invention, there is no fusion between the tip and the wire, and stable welding can be performed over a long period of time, and the wire surface can be plated with copper or other plating. Since it does not break down, it is easy to manufacture.

Further, the effects of the present invention can be obtained in the same way even if the wire feeding speed conditions change, and the point is that the amount of adhered free metal powder is 0 per 10k9 of wire.
．． A bare wire of 1 tare or less is sufficient.

[Brief explanation of drawings]

The figure is a characteristic diagram of the amount of wire used versus the amount of metal powder deposited per 10k9 of wires.

Claims (1)

[Claims] 1 Used for welding in shielding gas, and 1 to 20
It is fed towards the welding part at a speed of 50 m/min.
The diameter to which ~500A of welding current is applied is 0.8~2.0
mmφ solid wire for welding, characterized in that it is made of bare wire that is not plated with copper plating or the like and has a deposit of free metal powder of 0.1 g or less per 10 kg of wire. solid wire.