JPH09122974A - Fine flux cored wire for stainless steel - Google Patents

Abstract

(57) [Abstract] [Problem] To use a soft and long conduit cable,
(EN) Provided is a small-diameter flux-cored wire for stainless steel, which has good wire feedability with little slippage in the wire feed roller portion and friction resistance in the conduit tube even when bent and welded. SOLUTION: One or two kinds of molybdenum disulfide and tungsten disulfide are added to the surface of a small-diameter flux-cored wire for stainless steel in an amount of 0.01 to 10 per 10 kg of the wire.
0.60 g, 0.01 or more of one or more metal soaps
.About.0.15 g and 0.01 to 0.15 g of lanolin, and a thin flux cored wire for stainless steel.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a small-diameter flux-cored wire for stainless steel, and more particularly to a small-diameter stainless steel thin-diameter wire having excellent wire feedability when welding a wire diameter of 0.8 to 1.6 mm. Regarding flux-cored wire.

[0002]

2. Description of the Related Art Small-diameter flux-cored wire for stainless steel tends to be used more and more with the progress of automation and higher efficiency of welding. However, depending on the target structure, welding is performed in a narrow space. However, since the conduit cable from the feeding roller of the wire feeder of the welding machine to the welding torch is bent to make it easier to use, it tends to be soft and long. When such a long and easily bendable conduit cable is used, the friction resistance increases when the wire passes through the conduit tube of the conduit cable during wire feeding, which interferes with wire feeding during welding and causes arcing. There is a problem that it becomes unstable and welding cannot be performed. For this reason, various measures have been taken so far for the small-diameter flux-cored wire for stainless steel in order to improve the wire feeding property, but there is still not sufficient one.

Regarding the problem of wire feedability, in the conventional small-diameter steel wire for carbon steel, vegetable oil,
Apply animal oil and mineral oil or their mixed oil. Further, Japanese Patent Application Laid-Open No. 55-40068 discloses a steel wire for arc welding coated with an ester composed of a higher fatty acid and a higher monohydric alcohol and a lubricant prepared by mixing the ester with MoS ₂ , graphite, or the like.
15073 discloses graphite, molybdenum disulfide,
A steel wire for arc welding in which a mixture of a solid lubricant such as glass powder is applied to the wire surface has been proposed.

However, even in these arc welding wires for carbon steel, when the above-mentioned soft and long conduit cable is used and the conduit cable is bent and welded, the wire slips at the feeding roller portion. The wire resistance is not sufficient due to the increased frictional resistance in the conduit tube, let alone the small diameter flux-cored wire for stainless steel, the wire sheath is hard and the wire transferability becomes even worse, making welding impossible. .

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention uses a soft and long conduit cable, and even when it is bent and welded, it causes a slip in the wire feeding roller portion and friction in the conduit tube. An object of the present invention is to provide a small-diameter flux-cored wire for stainless steel with low resistance and good wire feeding property.

[0006]

That is, the gist of the present invention is that the surface of a small-diameter flux-cored wire for stainless steel contains one or two kinds of molybdenum disulfide and tungsten disulfide per 10 kg of wire. 01-
0.60 g, 0.01 or more of one or more metal soaps
.About.0.15 g, and lanolin 0.01 to 0.15 g.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION One or two kinds of molybdenum disulfide and tungsten disulfide, one or more kinds of metal soap and lanolin are appropriately contained on the surface of a small-diameter flux-cored wire for stainless steel. Even when a soft and long conduit cable is used and bent and welded, slipping at the wire feeding roller portion and frictional resistance in the conduit tube are small, and therefore wire feeding performance is extremely improved. These effects can be achieved by the coexistence effect and the synergistic effect of each composition. The reasons for limiting each composition will be described below.

First, one or two kinds of molybdenum disulfide and tungsten disulfide were mixed with 0.
It is set to 01 to 0.60 g. When molybdenum disulfide and tungsten disulfide are contained in an amount of less than 0.01 g, the friction resistance in the conduit tube becomes large, resulting in poor wire feedability. On the other hand, if it exceeds 0.60 g, the wire is slipped at the wire feeding roller portion and uneven feeding occurs, and the arc becomes unstable.

One or more metal soaps should be used in an amount of 0.01 to 0.15 g per 10 kg of wire. One kind or two or more kinds of metal soap adheres molybdenum disulfide and tungsten disulfide firmly to the surface of the wire to prevent peeling in the wire feeding roller portion and the conduit tube. When the amount of one or more of the metal soaps is less than 0.01 g, molybdenum disulfide and tungsten disulfide are separated in the wire feeding roller portion and the conduit tube and slip at the wire feeding roller portion, The friction resistance in the conduit tube increases and the arc becomes unstable. On the other hand, if it exceeds 0.15 g, the amount of spatter generated increases.

The metal soap means potassium soap, sodium soap, calcium soap and the like. Lanolin should be 0.01 to 0.15 g per 10 kg of wire. Lanolin uniformly adheres molybdenum disulfide and tungsten disulfide to the surface of the wire to improve the wire feedability. If the lanolin content is less than 0.01 g, molybdenum disulfide and tungsten disulfide do not adhere evenly to the wire surface, so the wire slips at the wire feeding roller and friction resistance inside the conduit tube increases, causing arcing. Becomes unstable. On the other hand, if it exceeds 0.15 g, the amount of spatter generated increases. The cross-sectional shape of the small-diameter flux-cored wire for stainless steel according to the present invention includes not only various seams but also seamless wires without seams.

[0011]

The present invention will be described in more detail with reference to the following examples. First, a seamless flux-cored wire (corresponding to JIS Z3323 YF309LC) in which the adhesion amount of molybdenum disulfide and tungsten disulfide, metal soap and lanolin on the surface of a fine flux-cored wire for stainless steel with a wire diameter of 0.8 to 1.6 mm ( A flux filling rate of 20.5%) was prototyped. Figure 1 shows the wire feedability survey.
The apparatus shown in was used. That is, the wire pulled out from the spool 2 is fed to the torch 4 by the wire feeding motor 3 to a 6 m conduit cable 1 spool provided with a loop 2 rotation of 150 mm diameter for the purpose of increasing the feeding resistance.
And 10 kg of each wire was welded. Table 1 shows the welding conditions at that time.

[0012]

[Table 1]

The wire feedability was examined by measuring the armature current of the wire feed motor 3. The electric current is 3.
If it exceeds 5 A, the arc length changes and the arc becomes unstable. The wire slip at the wire feeding roller portion was determined by measuring the peripheral speed of the wire feeding roller and the wire speed at the wire feeding roller outlet side, and calculating the slip ratio by the following equation. If the slip ratio of the wire exceeds 5%, the wire feed speed becomes slow and unstable, and the arc becomes unstable due to uneven wire feed. Slip ratio = {(peripheral speed of feed roller) − (wire speed at feed roller outlet side)} / (peripheral speed of feed roller) × 100 The results are shown in Table 2.

[0014]

[Table 2]

In Table 2, the test No. 1 to 6 are examples of the present invention and test Nos. 7 to 12 are comparative examples. Test No. of the present invention example. Nos. 1 to 6 have one or two kinds of molybdenum disulfide and tungsten disulfide, one or more kinds of metal soap, and lanolin attached to the wire surface in an appropriate amount,
Even when a long conduit cable was bent and welded, the wire slip ratio at the wire feeding roller portion was small, the friction resistance in the conduit tube was small, and the arc was stable, which was a very satisfactory result. Comparative Example Medium Test No. In No. 7, since the amount of tungsten disulfide deposited is small, the friction resistance in the conduit tube is large,
The wire feedability deteriorated and the arc became unstable.

Test No. In No. 8, since the amount of molybdenum disulfide and tungsten disulfide attached was large, the wire slipped at the wire feeding roller portion and the arc became unstable. Test No. No. 9 is metallic soap, and test No. Since No. 11 had a small amount of lanolin, the frictional resistance was large in the conduit tube, and the wire slipped at the wire feeding roller portion, resulting in poor wire feeding performance and unstable arc. Test No. 10 is metallic soap, also test N
o. Since No. 12 had a large amount of lanolin attached, the wire feedability was good, but the amount of spatter generated was large.

[0017]

As described above in detail, according to the small diameter flux cored wire for stainless steel of the present invention, even if a soft and long conduit tube is bent and welded, slip and wire in the wire feeding section and The friction resistance in the conduit tube is small and stable arc welding is possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing a welding device used in an embodiment of the present invention.

[Explanation of symbols]

 1 Conduit cable 2 Spool 3 Wire feeding motor 4 Torch

Claims (1)

[Claims] 1. One or two kinds of molybdenum disulfide and tungsten disulfide in an amount of 0.01 to 10 per 10 kg of wire on the surface of a fine flux-cored wire for stainless steel.
0.60 g, 0.01 or more of one or more metal soaps
.About.0.15 g and 0.01 to 0.15 g of lanolin, and a thin flux cored wire for stainless steel.