JPH0959667A - Lubricant for flux-cored wire for stainless steel - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: Even when a soft and long conduit tube having good wire drawability is bent and welded, slip at the feeding roller portion and friction resistance in the conduit tube are small, and arc Provides a flux cored wire lubricant for stainless steel, which enables stable welding. SOLUTION: One or two kinds of molybdenum disulfide and tungsten disulfide are contained in 5 to 50%, one or more kinds of metal soap is contained in 1 to 10%, and lanolin is contained in 1 to 10%, and the balance is substantially contained. Lubricant for flux-cored wire for stainless steel, which is composed of water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant for a flux-cored wire for stainless steel, and more particularly to a lubricant for a flux-cored wire for stainless steel, which has excellent wire drawability and feedability during welding. .

[0002]

2. Description of the Related Art Conventionally, the wire drawing of a flux-cored wire for stainless steel is performed by applying a chloric or fluorocarbon resin as an external protective film, and then using a lubricant of a mixture of calcium stearate and barium stearate containing molybdenum disulfide. , Calcium stearate-based lubricants containing polytetrafluoroethyl termer, powdered lubricants such as potassium stearate, water-based lubricants containing polyglycol derivatives, such as oleic acid and linoleic acid A liquid lubricant such as a lubricant made of unsaturated fatty acid or a combination of the former and the latter is drawn to a predetermined product wire diameter.

To improve the feedability of the wire, for example, a mixture of solid lubricants such as graphite, molybdenum disulfide and glass powder in JP-B-63-15073 is applied to the wire surface. In addition, JP-A-57-199594
It is proposed in Japanese Patent Application Laid-Open Publication No. 1994-53200 to coat wool grease, lanolin or a lanolin derivative with a neutral oil as a viscosity modifier on the wire surface.

[0004] However, although the powder lubricant has good wire drawability, the amount of lubricant adhered to the wire surface tends to be non-uniform, and if the amount is large, it will accumulate in the contact tip or conduit during welding, or in the conduit. However, there are drawbacks such that the contact resistance with the wire is increased, the arc becomes unstable, and the amount of spatter increases. In the case of a liquid lubricant, the wire appearance is good, but the wire drawability is poor and the feedability during welding cannot be said to be good either.

Furthermore, depending on the structure made of stainless steel to be welded, welding is often performed in a narrow space, and from the viewpoint of ease of use at those places, the wire feeder of the welding machine is used. The conduit cable from the feed roller to the welding torch is bent to make it easier to use.
And tends to be long. In this way, when a long conduit cable is bent and used, friction resistance increases when the wire passes through the conduit tube inside the conduit cable when the wire is fed, and the above-mentioned lubricant is used for feeding the wire during welding. This causes a problem and causes a problem that the arc becomes unstable and welding cannot be performed.

[0006]

SUMMARY OF THE INVENTION Therefore, according to the present invention, even in the case of bending and welding a flexible and long conduit cable having good wire drawability, slippage in the feeding roller portion and in the conduit tube are prevented. A feature of the present invention is to provide a flux-cored wire lubricant for stainless steel, which has a low frictional resistance and enables stable arc welding.

[0007]

[Means for Solving the Problems] The outer coat of a flux-cored wire for stainless steel has a large work hardening property, and after the flux is filled into a strip steel or a pipe, several times of wire drawing-bright annealing (about 1
050 ℃, H ₂ atmosphere) repeatedly, 0.1 from the product diameter
Finish drawing wire several times from 0 to 0.5 mm larger diameter to obtain product diameter. Of these, we paid particular attention to the fact that the lubricant used in the finish wire drawing process, in which the wire is drawn to the product diameter, has a large effect on the wire feedability, and we have conducted intensive research into lubricant components. As a result, a molybdenum disulfide and tungsten disulfide, a metal soap, and lanolin were used to draw a wire using a lubricant consisting of an appropriate amount and the balance substantially water. It has been found that even when the cable is bent and welded, the friction resistance is small and the wire feedability is extremely good.

That is, the gist of the present invention is to
5 to 50% of one or two kinds of molybdenum disulfide and tungsten disulfide, 1 to 10% of one or more kinds of metal soap, and 1 to 10% of lanolin, and the balance substantially consisting of water. This is a lubricant for flux-cored wires for stainless steel.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. First, in the flux-cored wire for stainless steel according to the present invention, a stainless pipe is filled with a flux in which various alloy powders, a slag agent, a deoxidizer, etc. are mixed, or a stainless steel strip is formed into a U-shape and the flux is filled. Welding the back seams,
Alternatively, the product is wrapped as it is to obtain a raw wire, and wire drawing-bright annealing is repeated, and final drawing is carried out to obtain a final diameter of 0.8 to 1.6 mm to obtain a product.

Next, the reasons for limiting the lubricant component in the present invention will be shown. First, one type or two types of molybdenum disulfide and tungsten disulfide are made 5 to 50%. Molybdenum disulfide and tungsten disulfide improve the wire feedability. 1 of molybdenum disulfide and tungsten disulfide
If less than 5%, the friction resistance in the conduit tube increases and the wire feedability deteriorates.
On the other hand, when it exceeds 50%, it is not uniformly dissolved in metal soap, lanolin and water, and cannot be evenly attached to the wire surface. Therefore, the wire is slipped at the feeding roller portion, the frictional resistance is increased in the conduit tube, and the arc becomes unstable.

One or more kinds of metal soaps are 1 to 10
Must be%. Metal soap adheres molybdenum disulfide and tungsten disulfide firmly to the wire surface,
Improves the wire drawability of the flux-cored wire for stainless steel, which is a difficult wire drawing material, and prevents peeling in the feeding roller section and the conduit tube. If the content of one or more metal soaps is less than 1%, the wire surface will be scratched during wire drawing, and molybdenum disulfide and tungsten disulfide will peel off in the feeding roller and conduit tube during welding. The arc may become unstable due to slippage at the feed roller section or increased resistance friction in the conduit tube. On the other hand, if it exceeds 10%, the amount of spatter generated increases. The metal soap refers to potassium soap, sodium soap, calcium soap and the like.

Lanolin is 1 to 10%. Lanolin uniformly adheres molybdenum disulfide and tungsten disulfide to the wire surface, and improves wire drawability and wire feedability. If the lanolin content is less than 1%, molybdenum disulfide and tungsten disulfide in the lubricant cannot be mixed uniformly, scratches occur on the wire surface during wire drawing, and molybdenum disulfide and tungsten disulfide are evenly distributed on the wire surface. Does not adhere, the wire slips at the wire feeding roller during welding, and the friction resistance in the conduit tube increases, making the arc unstable. Conversely 10
If it exceeds%, the wire drawability and wire feedability are good, but the amount of spatter increases. It should be noted that the lubricant of the present invention has a diameter of 0.1 to 0.5 mm larger than the product diameter in the finish wire drawing step.
It is used as a lubricant for 3 dies, but may be used for all dies or only 1 die.

[0013]

EXAMPLES The effects of the present invention will be described more specifically with reference to the following examples. First, an alloy powder, a slag agent, and a deoxidizer are mixed in an appropriate amount, granulated with an inorganic binder, dried, and sized to obtain a flux of SUS3 having an outer diameter of 12 mm and a wall thickness of 1.2 mm.
It was filled into a 04 L stainless steel pipe at a target filling rate of 21%, and the wire drawing process-bright annealing was repeated to obtain a J of 1.50 mm diameter.
A flux-cored wire equivalent to IS Z 3323 YF309LC was obtained. Then, wire drawing was performed with 3 dies up to a product diameter of 1.2 mm, but the lubricant shown in Table 1 was used for one part or all of the dies, and each wire was drawn for 1000 kg and spooled for 12.5 kg. It was a wire. The wire feedability investigation used the apparatus shown in FIG. That is, for the purpose of increasing the feeding resistance, a wire pulled out from the spool 2 is fed by a feeding motor 3 to a 6 m conduit cable 1 in which a loop having a diameter of 150 mm is provided once and twice and is fed to a torch 4, 10 kg of each was welded.
The welding conditions at that time are as follows.

Welding current: 200 A Welding voltage: 31 V Welding speed: 30 cm / min Shielding gas: CO ₂ 20 liters / minute The wire feedability was examined by measuring the armature current of the feed motor 3. The wire feedability is 3.5 for the armature current.
If it exceeds A, the arc length changes and the arc becomes unstable.

The slip of the wire at the wire feeding roller portion was investigated by measuring the peripheral speed of the feeding roller and the wire speed at the outlet side of the feeding roller, and calculating the slip ratio by the following formula. When the slip ratio of the wire exceeds 5%, the wire feeding speed becomes slow and rapid, and the arc becomes unstable due to uneven feeding of the wire. Slip rate = (peripheral speed of feed roller) − (wire speed at exit of feed roller) / (peripheral speed of feed roller) × 100 The results are summarized in Table 1.

[0016]

[Table 1]

In Table 1, symbols A to F are examples in which a flux-cored wire for stainless steel was drawn by using the lubricant of the present invention and a lubricant was adhered thereto, and symbols G to L are comparative examples. The symbols A to F in the examples of the present invention impair the wire drawability because they contain 1 or 2 or more molybdenum disulfide and tungsten disulfide, 1 or 2 or more metal soap, and lanolin in an appropriate amount in the lubricant. Even if a long conduit cable is bent and welded, the wire slip ratio at the feed roller is small, the friction resistance in the conduit tube is small, and the arc is stable. .

In the comparative example, the symbol G indicates that the amount of molybdenum disulfide in the lubricant is small, so that the friction resistance in the conduit tube becomes large, the wire feeding performance deteriorates, and the arc becomes unstable. The symbol H indicates that the lubricant contains a large amount of molybdenum disulfide and tungsten disulfide, so it did not melt uniformly in the lubricant and was non-uniformly attached to the wire surface, causing the wire to slip at the feed roller and also inside the conduit tube. The friction resistance of the wire became large and the wire feedability was poor and the arc became unstable.

The symbol I indicates that the amount of metallic soap in the lubricant is small, and the symbol K indicates that the amount of lanolin is small. Therefore, the wire surface is scratched during wire drawing, and the wire slips at the feeding roller portion even during welding. The friction resistance also increased and the wire feedability was poor and the arc became unstable. The symbol J indicates that the metallic soap in the lubricant is large, and the symbol L indicates that the amount of lanolin is large, so that the wire feeding property was good.
Spatter generation increased.

[0020]

As described above in detail, according to the lubricant for a flux-cored wire for stainless steel of the present invention, a soft and long conduit tube can be bent and welded at the time of welding without impairing the wire drawability. Also, it is possible to perform welding in which the arc is stable with less slippage in the feeding roller portion and frictional resistance in the conduit tube.

[Brief description of 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 Feed motor 4 Torch

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area B23K 35/36 B23K 35/36 G // (C10M 173/02 103: 06 129: 40 159: 06 ) C10N 10:12 40:32 (72) Inventor Yoshiharu Yoshihara 4-2-1 Asae, Hikari-shi, Yamaguchi Nittetsu Welding Industry Co., Ltd. Hikari Plant

Claims (1)

[Claims] 1. Molybdenum disulfide and tungsten disulfide, one or two kinds, 5 to 50% by weight (hereinafter,%), one or more kinds of metal soap, 1 to 10%, and lanolin 1
A flux-cored wire lubricant for stainless steel, containing 10% to 10%, and the balance substantially consisting of water.