JP2002361481A - Iron based consumable welding material having excellent fatigue strength in welded joint part and welded joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron based consumable welding material which can obtain a welded joint having excellent fatigue strength, and which can make the most of the figure strength characteristic of the steel sheet even when a high tensile strength steel sheet is used as a base metal, and a welded joint which can exhibit the above characteristics. SOLUTION: The iron based consumable welding material has a composition containing 0.005 to 0.40% C, 0.2 to 8.0% Mn and >1.1 to 8.0% Si, and further containing 0.01 to 1% Se and/or 0.01 to 1% Te.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron-based material such as a coated welding rod, a flux-cored wire, a solid wire and the like which is used when performing fillet welding of a thin high-strength steel plate or the like, or horizontal fillet welding of a long leg. The present invention relates to a consumable welding material, a welded joint assembled using such an iron-based consumable welding material, and in particular, an iron-based consumable welding material capable of obtaining a welded joint having excellent fatigue strength, and exhibiting such properties. It relates to a welded joint.

[0002]

2. Description of the Related Art In recent years, as steel materials have been reduced in weight in various applications, high-strength steel sheets have been used in thin steel sheets typified by automobiles and thick steel sheets typified by shipbuilding, steel frames, bridges, and the like. Movement to use is becoming active. In these applications, each structure is often assembled by welding.
However, when a high-strength steel plate is used, the fatigue strength at the welded joint (welded portion) can be secured only to the level of conventional mild steel, and there is a problem that the fatigue strength inherent in the high-tensile steel plate cannot be exhibited.

It is known that the fatigue strength of a weld is closely related to the shape of the weld bead toe with respect to the base metal. FIG. 1 is an explanatory diagram showing a cross-sectional shape of a welded joint when two base materials 1 and 2 are overlapped and fillet welded,
ρ is the radius of curvature of the continuous portion of the base metal 1 and the weld metal 3 in the vertical cross section of the weld bead toe, and θ is the contact angle of the continuous portion (hereinafter simply referred to as “the radius of curvature of the weld bead toe, the contact angle”). Are shown below. That is, it is said that the larger the radius of curvature ρ and the contact angle θ of the toe portion of the weld bead shown in FIG. 1 become, the more particularly the larger the radius of curvature ρ becomes, the more a welded joint excellent in fatigue strength can be obtained.

In view of the above, various techniques have been proposed so far from the viewpoint of increasing the radius of curvature ρ and the contact angle θ as much as possible. For example, JP-A-8-
No. 25080 uses solid wire whose chemical composition is properly adjusted and strictly defines welding conditions such as welding voltage, welding current, welding speed, welding torch inclination angle and advance angle, and has excellent fatigue characteristics. There has been proposed a welding method for obtaining a radius of curvature ρ in order to obtain the same.
However, with such a technique, it is difficult as a practical problem to continuously and stably maintain the above welding conditions from the start to the end of welding, and there is a problem in terms of quality stability.

[0005] Japanese Patent Publication No. Hei 7-106471 discloses a melting method.
If the viscosity of the slag is too high, it will over the weld bead toe
Wraps are easily formed, while if the viscosity is too low,
Suitable viscosity based on the finding that
Slag component system (TiO _Two-MgO-ZrO_Two-Si
O_Two-Flux for horizontal fillet welding forming iron oxide)
Wires with wires have been proposed.

However, in such a slag flux cored wire, a large amount of slag is formed on the surface of the weld bead at each welding pass, so that a slag removal operation is required in a welding assembly process, and in some cases, slag separation. However, there is a problem that workability is remarkably reduced.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a welded joint having excellent fatigue strength. An object of the present invention is to provide an iron-based consumable welding material that can sufficiently utilize the original fatigue strength of a steel sheet even when a high-tensile steel sheet is used as a base material, and a welded joint that can exhibit such characteristics. .

[0008]

The iron-based consumable welding material that can achieve the above object is C: 0.005 to 0.5.
40%, Mn: 0.2-8.0% and Si: 1.1%
More than 8.0% or less, and Se: 0.0
It has a gist in containing 1 to 1% and / or Te: 0.01 to 1%.

In the iron-based consumable welding material of the present invention, it is also effective to include the following components as necessary, and the properties of the weld metal are improved according to the components contained. (1) at least one member selected from the group consisting of Ni: 0.01 to 5%, Nb: 0.01 to 1%, and V: 0.01 to 1% (2) Cr: 0.005 to 3% ( 3) Mo: 0.005 to 3% (4) Cu: 0.05 to 1.5% (5) Ca: 0.001 to 0.05% and / or rare earth element: 0.001 to 0.05% (6) B: 0.0005 to 0.05%

As the iron-based consumable welding material of the present invention, specifically, a solid wire (bare wire), a coated welding rod or a flux-cored wire (for example, a metal-flux-cored wire or a slag-based flux-cored wire), etc. Is mentioned.

[0011] A welded joint assembled using the iron-based consumable welding material as described above has excellent fatigue strength. In particular, when the weld metal portion contains Fe as a main component, Si: 0.7 to 5.5%, Se and / or T
e: A welded joint that is particularly excellent in fatigue strength as long as it contains 0.005 to 0.6%, respectively. Such a welded joint can be obtained by appropriately adjusting the combination of the chemical components of the welding material and the welding base material and the welding conditions.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have studied from various angles from the viewpoint of improving the shape of the weld bead toe. In particular, even if welding conditions such as welding voltage, welding current, welding speed, welding torch angle and advancing angle are not strictly defined, in order to stably obtain a good bead shape, the wettability of the molten metal to the base metal must be Based on the guideline of whether it is advisable to make it better, we conducted intensive research.

As a result, molten metal (weld metal before solidification)
In order to improve the wettability of Si, Se and Te are contained in the molten metal, and their contents and the content of Si are adjusted to an appropriate range [Si: 0.7 to 5.5%, Se and / or Or Te: 0.005 to 0.6%]. Then, when a relationship between the content of these elements contained in the welding material and the weld bead and a fatigue test were performed, Se and / or Te in the welding material were examined.
When the content of Si is set to 0.01% to 1% and the content of Si is set to more than 1.1% and 8.0% or less, the bead shape becomes good and the fatigue strength is stably exhibited. Thus, the present invention has been completed.

In the iron-based consumable welding material of the present invention, the contents of Se, Te and Si are adjusted to an appropriate range as described above, but the basic components C and Mn are also adjusted appropriately. There is a need. The reasons for limiting the ranges of these components are as follows.

C: 0.005 to 0.40% C is a component effective for improving the strength of a steel material (accordingly, a weld metal). Considering the yield of the components in the iron-based consumable welding material to the weld metal, if the C content is less than 0.005%, the desired strength cannot be imparted to the weld metal. However, when the C content in the iron-based consumable welding material exceeds 0.40%, not only deterioration of weldability (for example, low-temperature cracking and delayed fracture) is caused, but also high carbon martensite is formed and toughness is reduced. Will decrease. The preferred lower limit of the C content is 0.01%, and the preferred upper limit is 0.3%.

Mn: 0.2 to 8.0% Mn exerts an effect of improving both the strength and toughness of a weld metal by actions such as solid solution strengthening, transformation strengthening, and grain refinement strengthening. In order to exhibit such effects, the Mn content needs to be 0.2% or more. However, when the Mn content is excessive, the crack resistance and the toughness are remarkably deteriorated, so that the Mn content needs to be 8.0% or less. Note that a preferable lower limit of the Mn content is 0.6%,
A preferred upper limit is 7.0%.

[0017] Si: 1.1% greater, 8.0% or less Si is a component that lowers the viscosity of the Fe-based molten metal.
In order to increase the wettability of a liquid that solidifies rapidly such as welding, it is not sufficient to reduce the surface tension by adding Se and / or Te. Need to be increased. Furthermore, it is not only effective in increasing the strength of steel, but also exerts a strong deoxidizing effect, so it is extremely important to prevent the generation of bubbles and the oxidation of the weld metal to prevent the strength from decreasing. Plays a role. However, when the Si content is 1.1% or less, the viscosity of the molten metal does not sufficiently decrease to improve the wettability, so that the bead shape is not improved. On the other hand, when the Si content is excessive and exceeds 8.0%, the toughness of the steel is deteriorated, and cracks are easily generated in the weld metal. The Si content is preferably 1.2% or more, more preferably 1.3% or more, and most preferably 1.5% or more.

Se: 0.01-1% and / or T
e: 0.01 to 1% Se is an element effective for lowering the surface tension of the Fe-based molten metal, and has an effect of improving the wettability with the base material (steel material). However, Se is easily oxidized and easily evaporates in a welding arc due to a high vapor pressure, so that the yield from the welding material to the molten metal is poor. In order to improve the wettability between the molten metal and the base metal, Se contained in the welding material needs to migrate into the molten metal. Taking into account the yield of the welding material component to the molten metal, the value of 0.
If it is less than 01%, the expected wettability cannot be secured. However, when the Se content exceeds 1%, the amount of Se evaporating increases and spatter increases, and welding workability deteriorates significantly.

On the other hand, Te is an element exhibiting the same effect as Se, and the effect of enhancing the wettability is originally higher than Se. However, Te is more easily oxidized than Se and has a high vapor pressure, so that the yield from the welding material into the molten metal is extremely poor. Therefore, although the effect is recognized even if the amount of Te contained in the molten metal is smaller than Se, it is 0.01% in consideration of the yield.
It is necessary to contain the above. Further, for the same reason as Se, it is necessary to be 1% or less.

Although the effects of Te and Se can be exerted by containing each of them alone, the effects are further enhanced by containing them in combination. The preferable lower limit of these components is about 0.02%, and the preferable upper limit is 0.9%.
It is about.

The basic chemical components of the iron-based consumable welding material of the present invention are as described above.
It is also effective to include Nb, V, Cr, Mo, Cu, Ca, a rare earth element, B, and the like, and the characteristics of the weld metal are improved according to the contained components. The reasons for limiting the range of these components are as follows.

Ni: 0.01 to 5%, Nb: 0.01 to
1% and V: selected from the group consisting of 0.01 to 1%
One or more of Ni, Nb and V are all effective elements for improving the toughness and strength of the weld metal. If the content of Ni is less than 0.01%, such effects cannot be exhibited. On the other hand, if the Ni content exceeds 5%, primary grain boundaries develop and the toughness is rather deteriorated.
On the other hand, Nb and V exert the same effect as Ni, and also contribute to improvement in high-temperature strength. In order to exhibit these effects, it is preferable to contain 0.01% or more of all. However, if the content of Nb or V exceeds 1%, toughness and crack resistance are reduced due to the formation of carbides. In addition, a more preferable lower limit of these elements is about 0.02%, and a more preferable upper limit is about 0.8%.

Cr: 0.005% to 3% Cr not only strengthens the weld metal but also exerts effects such as improvement of corrosion resistance and high-temperature strength by the oxide film. In order to exhibit such effects, the Cr content must be 0.0
It is preferably at least 05%. However, Cr
When the content is excessive and exceeds 3%, the self-hardening property is increased and the crack resistance is reduced. Note that a more preferable lower limit of the Cr content is about 0.1%, and a more preferable upper limit is 2.
It is about 7%.

Mo: 0.005 to 3% Mo has the effect of enhancing the hardenability of the weld metal,
It contributes to improving the strength. In order to exert such effects, it is preferable to contain 0.005% or more.
However, if the Mo content is excessive and exceeds 3%, carbides are generated and the toughness deteriorates.

Cu: 0.05 to 1.5% Cu exerts an action of forming an amorphous film having an anticorrosion effect. To achieve these effects, 0.05
% Is preferable, but if it exceeds 1.5%, the effect is saturated and adverse effects such as welding cracks occur. Note that a more preferable lower limit of the Cu content is about 0.1%, and a more preferable upper limit is about 1.2%. When the surface of the iron-based consumable welding material is plated with Cu (for example, a coated welding rod), the Cu content is a value including the Cu content of the plating.

Ca: 0.001 to 0.05% and / or
Or rare earth element: 0.001 to 0.05% Ca and rare earth element (REM) are effective elements mainly for increasing the strength of the weld metal, improving the ductility, and stabilizing the arc. Are all 0.
It is preferable to contain 001% or more. However, when the content of these elements exceeds 0.05%, the amount of nonmetallic inclusions in the weld metal increases, and the ductility deteriorates. Note that a more preferred lower limit of these elements is about 0.002%, and a more preferred upper limit is 0.04%.
%. Further, the REM is scandium (S
c), yttrium (Y) and lanthanoid series rare earth elements (atomic numbers 57 to 71), and one or more of these elements may be used.

B: 0.0005 to 0.05% B, when added in a small amount, makes the structure finer and exhibits excellent low-temperature toughness. In order to exert such effects, it is preferable to contain 0.0005% or more. However, the B content becomes excessive and becomes 0.05%
If it exceeds, weld cracking resistance is significantly deteriorated. Note that a more preferable lower limit of the B content is about 0.0007%,
A more preferred upper limit is about 0.04%.

The basic chemical components and the effective components to be contained as necessary in the iron-based consumable welding material of the present invention are as described above, and the balance is substantially composed of iron. Means that, besides Fe, it is permissible to include a trace component that does not impair its properties. P, S, As, S
unavoidable impurities such as b. In addition, even if each of the above-mentioned active ingredients is contained below the preferable lower limit, it corresponds to an inevitable impurity. Further, among impurities, particularly, P and S, it is preferable to suppress the content thereof as described below.

P: 0.05% or less and S: 0.05%
When the P content is excessive, the P dissolved in ferrite not only impairs the toughness of the matrix but also causes welding cracks. For these reasons, the P content is preferably suppressed to 0.05% or less. Further, when the S content is excessive, when Se or Te is contained, similarly to P, deterioration of ductility and crack resistance of the weld metal portion is caused. For these reasons, it is preferable to suppress the content of S to 0.05% or less.
In consideration of the above-described effects, it is more preferable that the content of each of P and S is less than 0.03%.

The iron-based consumable welding material of the present invention may further contain a deoxidizing agent such as Al, Ti, or Zr, if necessary. The reasons for limiting the range when these are contained are as follows.

Al: 0.01-1%, Ti: 0.01-
1% and Zr: selected from the group consisting of 0.01 to 1%
One or more of these elements all act as a deoxidizing agent.
It is preferable to contain the above. However, if the content of Al is excessive and exceeds 1%, a large amount of Al ₂ O _3, which is a deoxidation product, remains in the weld metal, and the toughness is significantly reduced. .

On the other hand, Ti and Zr are both strong deoxidizing agents and not only prevent oxidation of the deposited metal,
Since an oxide is formed, it is effective in increasing strength by precipitation hardening and improving toughness by making the structure finer. However,
If the content of Ti or Zr is excessive and exceeds 1%, weldability is deteriorated, and toughness is significantly reduced due to formation and precipitation of carbides. In addition, a more preferable lower limit of these elements is about 0.02%, and a more preferable upper limit is about 0.9%.

Typical examples of the iron-based consumable welding material of the present invention include a steel solid wire (bare wire) and a coated welding rod. Metal powder and slag are formed inside a steel sheath material. The present invention is also applicable to a metal flux cored wire or a slag flux cored wire filled with an agent. When used as a slag-based flux-cored wire, it is necessary to improve the slag peelability after welding in order to prevent a decrease in welding workability.
From this point of view, it is effective to add bismuth oxide, but in this case, the addition amount is preferably about 0.002 to 0.1% based on the total mass of the iron-based consumable welding material.

For the purpose of adjusting the stability of the arc and the amount of slag, oxides, fluorides, metals, alloys and the like can be appropriately added as flux components, if necessary. For example, an oxide such as CaO, MnO, or Al ₂ O ₃ is added as a slag forming agent for adjusting the amount of slag, or CaF ₂ , SrF ₂ , MgF ₂ , or the like is used as a dehydrogenating agent.
It is also effective to add a fluoride such as K ₂ SiF ₆ .

When the iron-based consumable welding material of the present invention is used as a flux-cored wire, the sectional shape of the wire, the material of the casing, the diameter of the wire and the like are not particularly limited. In addition, mild steel or the like is usually used as the shell metal for the form of addition of the components, but the components and the amount of addition that are insufficient with the shell metal alone are supplemented by blending into the flux, and the predetermined content relative to the total weight of the wire is reduced. Good. Further, the outer shell component is not particularly limited. The flux filling rate is not particularly limited, but about 5 to 25% is appropriate in consideration of the workability of the wire.

The iron-based consumable welding material of the present invention is as described above.
Although it can be used in various forms, whether the form is a solid wire or a flux-cored wire, the shielding gas for welding is not particularly limited. In addition to carbon dioxide gas arc welding, it can be used for gas arc welding mainly using Ar gas. Is also applicable. Whichever form is adopted, excellent fatigue strength can be imparted to the welded joint by assembling the welded joint using the iron-based consumable welding material of the present invention.

As described above, the weld metal containing Fe as a main component according to the present invention contains Si: 0.7 to 5.5% and Se and / or Te: 0.005 to 0.6%, respectively. However, the reasons for limiting these ranges are as follows.

Si: 0.7-5.5% The basic operation of Si is the same as that described in the description of the welding material. However, Si contained in the welding material reacts with oxygen contained in the gas phase or the like in a molten state to form a slag such as SiO _2, so that not all of the Si contained in the welding material is yielded. As described above, the content is preferably set to 0.7 to 5.5% in consideration of the yield.

Se and / or Te: 0.005 to
The basic operation of 0.6% Se and Te is the same as that described in the description of the welding material. However, Se and Te are easily oxidized, and not all Se and Te contained in the welding material are necessarily contained in the weld metal. Therefore, it is necessary to consider the yield.

In order to exert the effect of improving the fatigue strength by Se or Te, it is necessary that Se or Te alone or in combination is contained at least 0.005% in the weld metal, but exceeds 0.6%. And the welding workability is extremely deteriorated.

In the case of a base metal to be welded using the welding material of the present invention, the effect is most exhibited in the case of high-tensile steel, but the type of base metal used in the present invention is high. Not only for tensile steel, but also for mild steel, other steel materials, etc., in such a case,
By appropriately adjusting the combination of the chemical components of the welding material and the welding base material and the welding conditions so that the chemical component of the weld metal portion falls within the above range, a welded joint having excellent fatigue strength is obtained. be able to.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following Examples do not limit the present invention, and any design change based on the above and following points is not limited to the present invention. It is included in the technical range of.

[0043]

EXAMPLES Lap arc welded joints were produced under the following welding conditions using steel sheets having the chemical components shown in Table 1 below as a base material. Fig. 2 shows the welding state (the target position of the wire) at this time.
Shown in In FIG. 2, reference numerals 1 and 2 denote a base material (see FIG. 1) and reference numeral 4 denotes a welding material. As a welding material at this time, a metal-based flux-cored wire (diameter: 1.2 mm) was prepared by filling a mild steel casing with metal powder and adjusting the overall chemical composition to be as shown in Table 2 below. Was served. (Welding conditions) Welding current: 240 A Welding voltage: 33 V Welding speed: 80 cm / min Projection length: 20 mm Shielding gas: 100% CO ₂ (supply amount: 20 L / mi)
n)

[0044]

[Table 1]

[0045]

[Table 2]

With respect to each of the produced welded joints, the radius of curvature ρ and the contact angle θ of the toe of the weld bead shown in FIG. 1 and the fatigue strength, and the chemical composition of the weld metal were examined. In addition, the chemical composition analysis of the weld metal part was performed by the following method.

(Chemical component analysis method) A chip was collected from the surface layer of the weld metal portion shown in FIG.
The analysis of each component of e was performed by the following method. Si: Mo blue absorption spectrophotometry (≦ 1%), gravimetric method (≧ 1%) Se: 2.3 Diaminonaphthalene extraction absorption spectrophotometry Te: Tetra n-hexylammonium iodide extraction atomic absorption method

At this time, the radius of curvature ρ of the toe of the weld bead is
And the contact angle θ were determined by averaging the values of 10 points arbitrarily selected. As for the fatigue strength, FIG.
(2) In the figure, the oscillating plane bending fatigue test was performed using a welded joint (as-welded state) as a test piece (reference numerals 1 to 3 in the drawing are the same as those in FIG. 1) (frequency: 25 Hz,
Sine wave stress, stress ratio: -1) It was determined as the maximum load that can withstand 2 × 10 ⁶ repetitions.

The results are shown in Table 3 below. Table 3 also shows the results of the evaluation of welding workability by evaluating the occurrence of spatter during welding.

[0050]

[Table 3]

From the results, the following can be considered. First, test no. 10 to 17 are examples in which both the welding material and the welding metal used satisfy the chemical composition range defined in the present invention, and both the radius of curvature ρ and the contact angle θ of the toe of the weld bead are large. It can be seen that the fatigue strength was high.

On the other hand, Test No. Samples Nos. 1 to 9 and 18 to 21 are comparative examples in which the chemical components of the welding material and the welding metal are out of the range specified in the present invention, and high fatigue strength is not obtained in the welded joint (Test No. 1). 20, 21
No. was not evaluated because the amount of generated welding spatter was extremely large and welding workability was significantly deteriorated). These comparative examples can be evaluated as follows.

Test No. In Comparative Examples 1 to 6, Si, S
Since the content of each of e and Te is less than the range specified in the present invention for both the welding material and the welding metal, at least one of the improving effects of the wettability improvement of the molten metal and the steel sheet and the viscosity reducing effect of the molten metal is small. The radius of curvature ρ and the contact angle θ of the weld bead toe are small.

Test No. In Comparative Example 7, since the contents of C and Mn were small, the strength of the weld metal part was low, so that the fatigue strength of the weld metal part was reduced, and as a result, the strength of the weld joint part was reduced. Is declining.

Test No. In the comparative example of No. 8, since the content of Mn exceeds the range specified in the present invention, the toughness of the weld metal part is reduced, micro cracks are generated in the weld metal part, and the fatigue strength of the weld joint part is reduced. ing.

Test No. In the comparative example of No. 9, since the content of C exceeds the range specified in the present invention, the strength of the weld metal part is reduced, micro cracks are generated in the weld metal part, and the fatigue strength of the weld joint part is reduced. are doing.

Test No. In Comparative Examples 18 and 19, the Si content of both the welding material and the welding metal exceeded the range specified in the present invention, so that the toughness of the welding metal portion was reduced, and minute cracks occurred in the welding metal portion, and the weld joint The fatigue strength of the part has decreased.

[0058]

The present invention is configured as described above, and by appropriately adjusting the contents of Si, Se, and Te in the welding material and the welding metal, the radius of curvature of the weld bead toe and the contact radius can be improved. It is possible to realize iron-based consumable welding materials and welded joints that can increase the angle and obtain high fatigue strength without welding welding without reworking the welding bead. Even if it is used, the original fatigue strength of the steel sheet can be fully utilized and it is extremely useful.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a cross-sectional shape of a weld joint when two base materials are overlapped and fillet welded.

FIG. 2 is an explanatory view showing a state of welding (a target position of a wire) when a welded joint is manufactured in the example.

FIG. 3 is an explanatory view showing the shape of a test piece when a swing plane bending fatigue test is performed.

[Explanation of symbols]

 1, 2 Base metal 3 Weld metal 4 Weld material

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masao Kibuchi 1-5-5 Takatsukadai, Nishi-ku, Kobe In Kobe Research Institute, Kobe Steel Ltd. (72) Inventor Eiichi Tamura 1 Takatsukadai, Nishi-ku, Kobe-shi Kobe Steel Co., Ltd.Kobe Research Institute

Claims (10)

[Claims] 1. C: 0.005 to 0.40% (meaning% by mass with respect to the total mass of iron-based consumable welding material; the same applies to welding materials below), Mn: 0.2 to 8.0% and S
i: more than 1.1% and not more than 8.0%, respectively;
Se: 0.01-1% and / or Te: 0.01-
An iron-based consumable welding material excellent in the fatigue strength of a welded joint, characterized by containing 1%. 2. Ni: 0.01 to 5%, Nb: 0.01
2. The iron-based consumable welding material according to claim 1, wherein the iron-based consumable welding material contains at least one member selected from the group consisting of -1% and V: 0.01-1%. 3. The iron-based consumable welding material according to claim 1, which contains 0.005 to 3% of Cr. 4. The iron-based consumable welding material according to claim 1, containing Mo: 0.005 to 3%. 5. The iron-based consumable welding material according to claim 1, which contains 0.05 to 1.5% of Cu. 6. Ca: 0.001 to 0.05% and / or
The iron-based consumable welding material according to any one of claims 1 to 5, wherein the iron-based consumable welding material contains 0.001 to 0.05% of a rare earth element. 7. The iron-based consumable welding material according to claim 1, containing B: 0.0005 to 0.05%. 8. The iron-based consumable welding material according to claim 1, wherein the iron-based consumable welding material is any one of a solid wire, a coated welding rod, and a flux-cored wire. 9. A welded joint assembled using the iron-based consumable welding material according to any one of claims 1 to 8. 10. The weld metal portion contains Fe as a main component and Si: 0.7 to 5.5% (mass% in the weld metal portion).
, And the same applies to the weld metal portion hereinafter), and Se and / or Te: 0.005 to 0.6%, respectively.