JP2003103396A - Wire for low current high-speed welding for austenite- based stainless steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire for welding austenite-based stainless steel exhibiting excellent arc stability under the welding condition of low current short circuiting transfer of welding speed 30-70 CPM. SOLUTION: By providing the wire for welding the austenite-based stainless steel, wherein on the basis of a Hv 1 hardness tester, the difference between the center part of the wire and the surface part is 18 or less, the difference among the hardness measured at a distance of arbitrary 200 mm in the longitudinal direction of the wire is 15 or less, and the value of a trace element (Si+P +S+N)/Mn is 0.19-0.62, the arc stability is enhanced, and excellent welding quality and welding workability are secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an austenitic stainless steel welding wire, and more specifically, it improves wire feedability and arc stability during low current and high speed welding, thereby providing high quality welding. The present invention relates to an austenitic stainless steel welding wire that can achieve quality.

[0002]

2. Description of the Related Art Stainless steel is made by adding chromium to steel.
It is a type of alloy steel with improved corrosion resistance and is roughly classified into chromium type and chromium-nickel type depending on its composition, and depending on the metal structure, martensite type, ferrite type, austenite type, austenite-ferrite type and precipitation hardening type. It is classified into 5 types.

Austenitic stainless steel is a chromium-nickel system, and a typical example thereof is 18% chromium-8% nickel, which is known as the most economical composition.
There is 8-8 stainless steel, and various types of improved steels have been developed.

Recently, high-speed and high-efficiency welding is required to improve productivity throughout the industry. Therefore, even in the welding of stainless steel, the thin-film (3 mm or less) low current and stable welding arc in high-speed welding are required. It is a situation in which sex is urgently required.

The problems in the low current and high speed welding can be roughly classified into the stability of the arc and the feedability of the wire, but if the stability of the arc is not good, the welding is not performed at the start of the arc. In some cases, the arc may break during welding.

In particular, if the above-mentioned situation occurs in automatic welding, additional post-processes such as grinding and repair welding are required, leading to an increase in manufacturing cost.
Further, in some cases, defective products are produced, which causes deterioration of manufacturing quality. Moreover, if the arc stability is not good, the change in arc length and the change in welding current will be large and large spatters will be generated.In this case, there is a risk of fire due to spatter removal work and spatter scattering. With sex.

There is also a method of adding various trace elements in the steelmaking process in order to improve the stability of the arc, but if the feedability in high-speed welding is not secured, a stable welding arc can be obtained only by adding the above elements. It is difficult to secure.

On the other hand, if the wire feeding property is not good, the wire feeding becomes poor during high-speed welding, so that it is difficult to pass through the welding cable, and there is a possibility that the arc may break. The phenomenon that the arc breaks makes the wire feeding unstable, changes the length of the arc, and makes the electron transfer between the base material and the filler material unstable. Such unstable electron movement is the main cause of arc breakage and welding bead discontinuity, together with rapid movement of the molten pool due to high speed welding.

On the other hand, conventionally, a method of applying a lubricating oil to the surface of the wire in order to improve the feeding property of the wire (Japanese Patent No. 2682814, Japanese Patent Publication No. 11-147).
174, Japanese Patent Publication No. 2000-94178, etc.) and a method for making the surface shape uniform (Korean Patent No. 134).
No. 857) etc., but if the welding cable length is long or twisted only by controlling the surface of the wire, the wire will be subjected to a large load, and the wire will be twisted or bent. There is a risk that feeding failure will occur.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and improves the arc stability at the time of low current and high speed welding of austenitic stainless steel to obtain high quality. It is an object of the present invention to provide an austenitic stainless steel welding wire capable of obtaining the above welding quality.

[0011]

In order to solve the above-mentioned problems, the present invention adjusts the hardness difference between the central portion and the surface on the cross section of the austenitic stainless steel welding wire and the hardness difference in the longitudinal direction, and sends the wire. It is an object of the present invention to provide an austenitic stainless steel welding wire capable of obtaining high welding quality by improving the feedability and adjusting the trace elements contained in the wire within a certain range.

That is, the austenitic stainless steel welding wire according to the present invention has a welding speed of 30 to 70 CP.
M (cm / min) low current short circuit transition (short cir)
Hv1 hardness tester (Vickerssha) as an austenitic stainless steel welding wire that exhibits excellent arc stability under welding transfer conditions.
rdness tester (hereinafter referred to as Hv1) as a reference, the hardness difference between the central portion and the surface on the cross section of the wire is 18 or less, and the hardness difference measured at an arbitrary 200 mm interval in the longitudinal direction of the wire is 15 or less, a trace element (Si + P +) contained in the wire.
The value of (S + N) / Mn is 0.19 to 0.62.

[0013]

DETAILED DESCRIPTION OF THE INVENTION Referring to the accompanying drawings,
The present invention will be described in detail. This application is June 28, 2000
Korean Patent Application No. 2000-3612 filed on the date
No. 6 (Japanese Patent Application No. 2001-18 corresponding thereto)
9298), which is hereby incorporated by reference as if fully set forth herein.

The wire referred to in the description and claims of the present application means a solid wire for welding austenitic stainless steel for MIG welding, and the term arbitrary section refers to all parts of the wire. When the section to be welded for 0.1 second is arbitrarily selected, it means the arbitrarily selected section.

The inventor of the present application, when welding at a welding speed of 30 to 70 CPM under a low current short-circuit transfer welding condition for austenitic stainless steel welding wire, the variation coefficient ratio (variation coefficient of welding current / It was found that the arc stability was significantly improved when the value of the variation coefficient of the welding voltage) was kept in the range of 0.3 to 0.7, and the inventors conducted diligent research to find a wire that meets the above conditions. As a result, H
The difference in hardness between the central portion and the surface on the wire cross section is 18 or less based on the v1 hardness tester, and the hardness difference measured at any 200 mm interval in the longitudinal direction of the wire is 15 or less. Trace elements (Si + P + S
It was found that when the value of + N) / Mn is 0.19 to 0.62, the wire feedability and arc stability are excellent.

First, based on the experimental results of the present inventor, when the welding speed was welded to 30 to 70 CPM under the low current short-circuit transfer welding condition of the austenitic stainless steel welding wire, the variation coefficient ratio, ie, 'welding' was obtained. A phenomenon in which the stability of the arc is improved when the value of the coefficient of variation of current / the coefficient of variation of welding voltage 'is maintained in the range of 0.3 to 0.7 will be described.

First, the transition to a short circuit will be described with reference to FIG. As shown in FIG. 1, arc welding is performed while a short circuit section in which the arc is short-circuited and an arc generation section in which the arc is held are subsequently repeated. In the short circuit section, the arc does not appear during the period in which the droplets are moved from the filler material to the base material. However, when the movement of the droplets ends, a new arc is generated to melt the filler material and generate new droplets. Arc welding is performed while repeating this process.

On the other hand, the reason why the variation coefficient ratio is limited to 0.3 to 0.7 is as follows. When the variation coefficient ratio exceeds 0.7, the variation coefficient of the welding current becomes larger than that of the welding voltage, which means that the variation of the welding voltage with respect to the arc length is too small or the variation of the welding current is small. It means that it is too large, but under such conditions, the short circuit transition is not sufficiently performed in any section where the measurement is performed, or the maximum value of the current becomes large due to the excessive fluctuation of the welding current. The above) will generate spatter.

On the other hand, if the variation coefficient ratio is less than 0.3,
The variation coefficient of the welding voltage is larger than the variation coefficient of the welding current, which means that the variation of the welding voltage with respect to the arc length is too large or the variation of the welding current is too small. Instantaneous short circuit (2)
(msec or less) may occur frequently, and if the fluctuation of the current is too small, the arc generation time may be extended, which may result in insufficient short circuit. Therefore, the fluctuation coefficient ratio is less than 0.3. In this case, the arc cannot be evaluated as stable.

Therefore, the inventor of the present invention sets the variation coefficient ratio expressed as "variation coefficient of welding current / variation coefficient of welding voltage" to 0.3 to.
It was set as a condition for ensuring the stability of the arc that it was limited to the range of 0.7.

On the other hand, it is important to keep the short-circuit variation coefficient within a predetermined range in order to smoothly generate the next arc even in the short-circuit section, but the short-circuit variation coefficient (standard deviation / average time) in the short-circuit section is 0. The stability of the arc is further improved by maintaining it in the range of 0.25 to 0.6. The reason is that if the short circuit variation coefficient is less than 0.25 or exceeds 0.6,
This is because the next arc generation becomes somewhat irregular and the smooth short-circuit transition does not proceed. In this case, it is difficult to obtain a beautiful bead appearance.

Therefore, the present inventor is selective but more effective for ensuring arc stability and a clean weld bead when welding at a welding speed of 30 to 70 CPM under low current short circuit transfer welding conditions. As a condition for obtaining the result, the short-circuit variation coefficient in the short-circuit section, which is expressed as “standard deviation / average time”, is kept within 0.25 to 0.6.

As described above, the objective standard for evaluating the arc stability of the austenitic stainless steel welding wire for low current high speed welding is set, and the variation coefficient ratio or the variation coefficient ratio is set under the short-circuit transfer welding condition. As a result of earnest research on means for keeping both the short-circuit variation coefficient and the short-circuit variation coefficient within the above range, when the Hv1 hardness tester is used as a reference, the hardness difference between the center and the surface on the wire cross section is 18 or less, and the length of the wire is The hardness difference measured at an arbitrary 200 mm interval with respect to the direction is 15 or less, and the value of the trace element (Si + P + S + N) / Mn contained in the wire is 0.19 to 0.62.
In this case, the variation coefficient ratio or the variation coefficient ratio and the short circuit variation coefficient are all included in the range proposed by the present invention, and the arc stability was found to be the most satisfactory.

In the wire of the present invention, when the Hv1 hardness tester is used as a reference, the hardness difference between the central portion and the surface on the wire cross section is 18 or less, and any 2 in the longitudinal direction of the wire.
The reason why the hardness difference measured at intervals of 00 mm is set to 15 or less is to make the residual stress distribution of the final product line uniform and improve the feedability of the wire.
Korean Patent Application No. 2000 filed on June 28, 2012
-36126 (Japanese Patent Application No. 2001-1892)
98), and only the gist thereof will be described below.

Generally, various kinds of wires including welding wires are passed through dies of various sizes from the first original wire (ROD) to the final product wire, and the surface is gradually reduced from a large diameter to a small diameter. The finished product line is drawn.

In the wire drawing (WIRE DRAWING) process, as factors relating to the wire feedability, the drawing schedule according to the area reduction rate for drawing the final product wire to the desired wire diameter (wire drawing), and the tensile strength of the wire The distribution of internal stress through adjustment of the deviation of the drawing ratio, the straightness of the wire, and the like are possible. Of these, the uniformity of the internal stress distribution of the wire is
It is the most important factor to consider in the wire feedability.

Conventionally, in the wire drawing process for improving the wire feedability, only the area reduction rate of the formula of simply changing the large diameter to the small diameter is taken into consideration, or the tensile strength and the drawing rate of the wire are taken into consideration. It was common to consider the homogenization of the distribution of internal stress through the adjustment of the deviation of.

However, in the wire drawing step, every time wire drawing (wire drawing) overlaps, the outside of the wire, that is, the surface contacting with the die, has a denser structure than the center and hardens. However, each time such hardening is overlapped, the wire cannot be stretched, and the distribution of residual stress in the outer portion and the central portion of the wire becomes more uneven. Therefore, in adjusting the drawing schedule and controlling the tensile strength of the drawn wire by the conventional simple reduction of area, there is a limit to making the distribution of residual stress inside and outside the final product wire uniform.

Further, the hardening of the wire surface following the continuous wire drawing induces wear of the die that comes into contact with the wire and damages the surface of the drawn wire, thus improving the quality of the final product wire. It has no effect and, as a result, hinders smooth wire feeding during welding.

The wear of the die due to the contact between the wire having the hardened surface and the die causes the contact area with the wire to be non-uniform, and therefore the distribution of residual stress in the longitudinal direction of the final product line is caused. Also becomes uneven.

Therefore, the present inventor has attempted to improve the wire feeding property by making the distribution of the stress inside the wire uniform by adjusting the hardness deviation in the wire cross section and the hardness deviation in the wire longitudinal direction in the wire drawing step.

On the other hand, as shown in FIG. 2, the method of equalizing the distribution of the stress inside the wire reduces the contact area actually reduced when the wire passes through the die by reducing the contact area 20 and the area thereof. When the contact area where the wire diameter is corrected is called the correction contact portion 200 and the area is called the correction contact area, it is achieved by managing the total area of the reduced surface contact area and the correction contact area. it can.

The reduced surface contact area and the correction contact area will be described in detail with reference to FIG. The contact area between the wire (W) and the die (D) is largely determined by i) the contact area between the die (D) and the wire (W) where the surface reduction of the wire (W) is actually performed. , Ii) The straightness of the wire and the wire (W) and the bearing portion (20) according to the straightness of the wire.
0) is the contact area. The bearing part (200)
The diameter of the wire is corrected by and the straightness is improved.

First, considering the former case, when the contact area of the portion where the wire (W) is actually reduced (reduced contact portion) is too small, on the (circular) cross section of the wire. The difference in residual stress between the inside (center) and the outside (surface) of the wire becomes large, and the hardness difference between the outside of one side of the wire and the outside of the other side becomes large, and the wire passes through the feed roller during welding. The continuous local load that is sometimes received cannot be withstood, and the wire is twisted, causing the tip of the tip to sway, which may cause arc instability.

If the contact area is too large, the local work hardening phenomenon has a bad influence on the surface quality of the wire. The stress deviation may be so large that wire drawing may become impossible.

Next, considering the latter case, when the contact area between the wire (W) to be drawn and the bearing (200) is too small, the inside of the wire (W) in the longitudinal direction is The stress deviation is so great that the wire is not fed smoothly, which means that the wire cannot withstand the continuous and localized load that the wire receives as it passes through the feed roller, twisting or entanglement. Is it the cause of separation from the feeding roller?
The straightness of the wire (W) is insufficient and the wire is likely to be deformed after passing through the feeding roller or the cable during welding, and the wire cannot have straightness even after passing through the contact tip. This causes welding defects (meandering beads).

Conventionally, as a method of controlling the deviation of the internal stress, the deviation of the tensile strength and the drawing rate of the product line due to the stable surface reduction rate is managed. That is, there is a limit to the control of the stress on the outer surface of the wire, which receives the load during feeding, and the stress on the central portion of the wire, which transmits the load from the surface.

Therefore, the present inventor, as shown in FIG.
The contact area where the wire is actually reduced when passing through the die is referred to as a reduced contact area 20 and its area is referred to as a reduced contact area, and the contact area where the wire diameter is corrected is the corrective contact portion 2.
00 and the area thereof are referred to as a straightening contact area, and it was found that the distribution of the internal stress can be made uniform by controlling the total area of the reduced surface contact area and the straightening contact area.

Next, the influence of the constituents contained in the welding wire on the coefficient of variation was considered as a part of keeping the coefficient of variation within the above range. As a result, Mn, Si, S, N, and P, which are added in a small amount but affect the stability of the arc or the austenite,
As a result of intensive research on the content of (Si + P + S
It has been found that when the value of + N) / Mn is in the range of 0.19 to 0.62, the variation coefficient ratio range can be easily maintained.

Each component of the trace element will be described as follows. Mn has a deoxidizing effect on the weld metal and acts as an austenite stabilizing element. However, if the Mn is added in an excessive amount, the corrosion resistance and the oxidation resistance are deteriorated, the surface tension formed at the wire tip during welding is increased, and the transfer of droplets is disturbed in the low current short circuit transition section, and the short circuit section is prevented. It will cause the extension.

Si is an effective deoxidizer and arc stabilizer. Oxidation resistance is increased by the addition of Si,
Although it has the effect of improving the wettability of the molten metal, if it is added in an excessive amount, it causes weld solidification cracking.

S is added during MIG welding in order to improve the bead shape and to stabilize the welding arc and reduce the amount of spatter. Also, MnS is added for the purpose of preventing coarsening of crystal grains during hot working, but when it is excessively added, the amount of slag formed on the bead is increased to form a compound having a low melting point and hot cracking. Excessive addition is not preferred because it causes

P and N are usually elements that are not useful for improving the weldability, and when an excessive amount is added, the problem of impairing the hot workability occurs during the production of the wire rod, so it is generally adjusted to the minimum amount. However, in the present invention, it was decided to add a small amount in order to stabilize the welding arc.

In consideration of the above points, the inventor of the present application has found that the trace elements (Si + P + S +) contained in the wire.
It was decided to set the value of (N) / Mn in the range of 0.19 to 0.62.

The effects of the present invention will be described below with reference to the invention examples included in the above-mentioned range proposed by the present invention and the comparative examples outside the scope of the present invention.

Table 1 below shows the solid wires for austenitic stainless steel used in the test, and the unit of the amount of spatter is g. Table 2 shows the low current short circuit transfer welding conditions.

[Table 1]

[Table 2]

The wires in Table 1 were obtained by gradually changing the composition of trace elements based on the AWS ER309 standard, and the reduction area of the wires was 5.5 mm → 1.2 mm.

In the feedability test of Table 1, a two-turn form is used,
The wire drawing process is as follows: primary wire drawing → heat treatment → secondary wire drawing → heat treatment → 3
The subsequent wire drawing (final wire drawing) is performed in order, and the final wire drawing stage is performed by separating the wire drawing (drawing) into two stages, and the contact area ratio in each wire drawing stage (in the final wire drawing process). For each wire, the Vickers hardness tester (Vicke hardness tester
rs hardware tester, Hvl
Hardness) was measured.

In the wire drawing step, heat treatment is performed after the primary wire drawing.
In addition, the heat treatment after the primary wire drawing is often performed before the final wire drawing, and in the case of stainless steel, a large amount of work hardening occurs. Therefore, the work hardening of the wire draw is solved for continuous wire drawing. The heat treatment, which is a heat treatment before the final wire drawing, is a heat treatment for minimizing and uniformizing the internal residual stress of the final product wire.

This is because the relaxation of the stress when the wire passes through the die is important, but the distribution of the residual stress of the service wire (service wire) is also important.

In the heat treatment before the final wire drawing, the stress is relieved to some extent after the primary wire drawing, but the distribution of the residual stress inside is nonuniform due to the continuous secondary wire drawing, and the excellent wire feeding is achieved. Since it is difficult to obtain a residual stress distribution that exhibits feedability, heat treatment before final wire drawing is an important step.

In the case of cross-section hardness deviation, the hardness deviation is obtained by measuring the hardness of the center and the surface of the cross-section of the wire, and in the case of the longitudinal direction, it is continuously measured at arbitrary 200 mm intervals of the wire.
The hardness is measured and the difference is arithmetically averaged (arithmetic mean value of three samples).

The wire drawing in the final wire drawing (that is, the third wire drawing) is separated into two steps, and the first step is to adjust the area-reducing contact ratio, that is, the contact angle between the wire and the die, to reduce the area-reducing contact area. In the second step, the straightening contact ratio, that is, the straightening contact area in the step of straightening the wire diameter of the wire drawing is regulated to reduce the hardness deviation on the cross section of the wire and the hardness deviation in the longitudinal direction.
This is a uniform distribution of residual stress in the wire.

That is, in the first stage, the contact angle between the wire and the die is reduced, the hardness deviation on the wire cross section is reduced, and the tip breakage due to the twisting of the wire during welding is prevented. In the stage, the bearing length of the die,
That is, the length of the bearing part where the wire is straightened is lengthened,
The hardness deviation in the longitudinal direction of the wire was reduced to prevent welding defects (serpentine beads) caused by bending or twisting of the wire as it passed through the cable. In the above, the magnitude of the contact angle between the wire and the die in the first drawing step and the degree of contribution to the contact area ratio with respect to the length of the bearing portion in the second drawing step are as follows. Within the range of 0.5, both are about 1/3 (1 to 1.17) to 1 /
2 (1.5 to 1.75) is required.

Tables 3, 4, and 5 below show welding currents in arbitrary 13 sections for each wire while performing low-current short-circuit transfer welding under the welding conditions of Table 2 using the wires of Table 1 above. The welding voltage and the variation coefficient ratio are measured and represented. Table 3 is 30 CPM and Table 4 is 50 CP.
M, Table 5 shows the case where the welding speed is 70 CPM.

The welding current, the welding voltage and the variation coefficient ratio are the Arc monitoring WAM-400 of Monitec Korea.
It was measured using 0D version 1.0. The coefficient of variation ratio means “variation coefficient of welding current / variation coefficient of welding voltage”. In addition, when welding the wire of Table 1 by 25 cm, the short-circuit section average time in any section, its standard deviation, and the short-circuit variation coefficient are shown. Here, the short circuit variation coefficient means'standard deviation / average time '. Then, in order to investigate the influence of the measured variation coefficient ratio and the short-circuit variation coefficient on the welding bead, 1.5 after the welding arc is started.
n = 50 for the weld bead width measured from cm onwards
The standard deviation was calculated as the standard, and the results are also shown. on the other hand,
In Tables 3, 4, and 5, the "current" item means the coefficient of variation of the welding current, the "voltage" item means the coefficient of variation of the welding voltage, and the "average" item means the averaging time.

[0057]

[Table 3]

[Table 4]

[Table 5]

To summarize Tables 3, 4, and 5, first, in Comparative Examples 1 to 3, the trace elements are included in the scope of the present invention, but the hardness deviation of the wire falls within the range proposed by the present invention. Since it exceeded, the feeding load was greatly expressed, and the range between the minimum value and the maximum value of the coefficient of variation ratio and the coefficient of short circuit variation was also greatly expressed.

In Comparative Examples 4 to 6, the hardness deviation of the wire was included in the range proposed by the present invention, and the feeding load was slightly low, but the trace elements were out of the range proposed by the present invention. The width of the minimum value and the maximum value of the coefficient of variation ratio and the coefficient of variation in short circuit was large as in Comparative Examples 1 to 3. Moreover, it was revealed that spatter was generated in a considerably larger amount than in the inventive examples.

On the other hand, in Comparative Examples 7 to 9, both the hardness deviation of the wire and the contents of the trace elements deviate from the ranges proposed in the present invention, and it is proved that the evaluation items of the feed load and the spatter generation amount are not good. It was Further, it can be seen that the range of the minimum value and the maximum value of the variation coefficient ratio and the short circuit variation coefficient is the largest.

However, in Inventive Examples 10 to 12, both the hardness deviation of the wire and the contents of trace elements are included in the range proposed in the present invention, so the feeding load is low, the spatter generation amount is small, and the fluctuations occur. It can be seen that the range of the minimum value and the maximum value of the coefficient ratio and the short circuit variation coefficient is the smallest.

Inventive examples had a bead width standard deviation of less than 0.25, and it was shown that a substantially constant bead width was obtained, whereas in the comparative example, a bead width with a standard deviation of 0.26 or more was constant. It was revealed that it was difficult to obtain the width.

Further, in the case of the amount of spatter of 1 mm or more generated during welding (see Table 1) and the feeding load, the invention example in which the variation coefficient ratio and the short circuit variation coefficient are maintained within a certain range as compared with the comparative example was obtained. It can be seen that it occurs less often.

From these results, the welding speed is 30 to 70 CP.
The austenitic stainless steel welding wire that exhibits excellent arc stability under the low current short circuit transfer welding condition of M is Hv
1 The hardness difference between the center and the surface of the wire cross section is 18 or less on the basis of the hardness meter, and the hardness difference measured at any 20 mm interval in the longitudinal direction of the wire is 15 or less, and the hardness is contained in the wire. Trace elements (Si + P + S + N)
It can be seen that the value of / Mn should be limited to the range of 0.19 to 0.62.

[0065]

As described above, according to the present invention, the arc stability is improved during austenitic stainless steel welding under low current short-circuit transfer welding conditions, and a good weld bead shape can be obtained. The amount of spatter generated is also reduced, and as a result, the effect of improving welding quality and workability is obtained.

[Brief description of drawings]

FIG. 1 shows the relationship between the short circuit period of low current short circuit transfer arc welding and the current and voltage at that time.

FIG. 2 illustrates a reduced surface contact portion and a straightening contact portion as a wire passes through a die.

Claims (2)

[Claims] 1. An austenitic stainless steel welding wire exhibiting excellent arc stability under a low current short-circuit transfer welding condition with a welding speed of 30 to 70 CPM, the center of the cross section of the wire being based on an Hv1 hardness meter. The hardness difference of the surface is 18 or less, the hardness difference measured at an arbitrary 200 mm interval in the longitudinal direction of the wire is 15 or less, and the trace elements (Si + P + S + N) / contained in the wire are
Austenitic stainless steel welding wire having a Mn value of 0.19 to 0.62. 2. The difference in hardness between the center and the surface of the cross section of the wire and the difference in hardness in the longitudinal direction of the wire are specified by a contact area ratio defined by the following formula within a range of 3 to 3.5. The austenitic stainless steel welding wire according to claim 1, which is adjusted by: Contact area ratio = Reduced surface contact ratio + Straightening contact ratio However, Reduced surface contact ratio = Reduced surface contact area / Drop wire cross-sectional area Straightening contact ratio = Straightening contact area / Leader wire cross-sectional area