JPS59212192A - Flux cored stainless steel wire - Google Patents

Abstract

PURPOSE:To provide a titled wire which has improved slag detachability by packing a flux consisting of a slag forming material contg. limited compsn. of S, Bi component, TiO2, SiO2 and ZrO2 and a specific amt. of a deoxidizing agent in a tubular sheath of a stainless steel. CONSTITUTION:A stainless steel is formed to a tubular shape, and a flux contg. a flux forming material consisting, by the total weight of a wire, of 0.001-0.1% S simple substance or as a compd., 0.001-0.3% Bi simple substance or as a compd., 1-10% TiO2, 0.1-7% SiO2 and 0.1-5% ZrO2 and 0.05-3% deoxidizing agent of Si, Ti, Al, Mg, etc. in total is packed in the sheath formed in such a way. The packed flux is wet mixed with water glass if necessary. Detachability of slag in gas shielded arc welding is improved by such flux cored wire and the all-position welding is accomplished with good workability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stainless steel welding material for gas-shielded arc welding, and more particularly to a stainless steel shear wire with good welding workability in gas-shielded arc welding.

Stainless steel has excellent resistance to corrosion, corrosion, and oxidation.
Although it is widely used in various fields due to its heat resistance, there is a problem in that manual welding with a covered arc welding rod is a living body and the welding efficiency is poor. As an alternative to this, MIG welding using solid wire has become popular.

However, although the MIG welding method using solid wire is superior in terms of efficiency, when applied to stainless steel, blowholes are likely to occur, and it is difficult to obtain a spread of weld metal in multilayer welding, resulting in poor fusion, making it difficult to use properly. There are some problems, such as a very narrow range of conditions. For these reasons, it is necessary to establish a welding method that is highly efficient, has good welding workability, and is less likely to cause welding defects such as blowholes and poor fusion.

Disadvantages of solid wire? 7 as a means of solving
Small diameter wire containing lux 1.6 mm φ, 1.2 w
A method of performing welding by using nφ and further flowing seal gas has been attracting attention.

In gas shield arc welding by reducing the diameter of flux-cored shear wire, the weld metal is maintained in both the slag shield and the gas shield due to the included slack, so the weld metal can be spread 9 and the bead shape can be improved. Good quality, less welding defects such as blowholes and poor fusion.
It is also capable of high-efficiency welding, and has become rapidly popular in recent years.However, up until now, most applications have been for downward or horizontal fillet welding; is good, but there is a problem with the adhesiveness of the slab. Regarding slag flaking, it has been found that addition of bismuth e-chloride etc. is effective in conventional methods.
For example, as disclosed in Japanese Patent Application Laid-open No. 56-4393, adding bismuth oxide or the like can improve the releasability of slag; There is a phenomenon in which the susceptibility to hot cracking increases and the bead shape becomes more disordered.

As for the applicable welding positions, as mentioned above, studies have been made targeting downward and horizontal fillet, but there is an increasing demand for application to welding in all positions. Vertical and horizontal welding is disclosed in Japanese Patent Application Laid-open No. 109192/1983, but this study only deals with vertical and horizontal positions, and in order to perform welding in all positions, it is necessary to Two types of wires have to be prepared and used depending on the welding position, one for vertical and one for vertical (horizontal), and there is a problem in that it takes time to replace and store the wires.

In view of the above-mentioned problems, an object of the present invention is to provide a stainless steel 72x shear wire that exhibits good slab peeling and good welding workability in all positions.

That is, the inventor has determined that Tmu o2°S i in the filling 7 lux
02, Zr 02, 8, old, and by adding an appropriate amount of deoxidizing agent, the synergistic effect of these elements becomes remarkable, and in all-position welding, slag peeling is good and a bead with a beautiful appearance can be obtained. It has been learned that all-position welding can be easily performed with one type of wire without any other deterioration in welding workability, high temperature cracking susceptibility, or mechanical performance deterioration.

In addition, by wet-mixing the filling 7 lacs with water glass, it has been found that when the Nogib is used as the outer shell, the filling can be evenly and uniformly filled, and a wire of uniform quality can be obtained.

In addition, as used in this specification, it means weight (wl)%.

In the present invention, inside the outer skin formed of stainless steel into a tubular shape, the total weight of one or more types of S alone or compounds is 8 o, o o, based on the total weight of the wire.
i~0.1%, and the sum of one or more types of Bi alone or compounds is 0.001~0.1% in terms of Bi alone.
3%, Ti0.1-10%, 8i020.1-7%,
Furthermore, a slag forming material containing 1 to 5% of ZrQ2O and a filling flux containing a deoxidizing agent of 1m or more of 8i, Ti@kl HMI with a total content of 0.05 to 3% is filled. Optionally, the filling 7 lacs is wet mixed with water glass.

The present invention will be explained in detail below.

First, what is the flux-cored shear according to the present invention?

An example of this is shown in FIG. 1, i.e., ξ-ib is used as the outer skin, or a steel strip is used as the outer skin.

Motsu wire refers to the cross section of the wire with the end of the steel band folded inside.Flux 2 is filled inside the outer shell l made of stainless steel ξ-ib or steel band formed into a tubular shape.
It is filled with In addition.

The shape of the outer skin is different from that shown in Figure 1, using a steel band as the outer skin.

It is possible to make 5 different shapes, such as making a tubular shape by butting the end faces of a steel strip together, making a tubular shape by overlapping the end faces of a steel strip, and making a tubular shape by folding a steel strip in a complicated manner. This does not detract from the purpose of the invention.

Next, the range of components of the slag formed into the wire will be described. S greatly improves slab delamination and bead shape and appearance. That is, it has a very high surface activity and lowers the interfacial tension between the molten metal and molten slag, thereby making the bead shape flat and improving the conformability of the bead toe. Furthermore, since the bead surface and the slab surface in contact with the bead surface are smooth, the appearance of the bead is also beautiful.

In addition, by increasing the bonding force between the slags near the slag surface that contacts the bead surface, and at the same time reducing the bonding force between the weld metal and the slag, the bead surface and toe become smooth, and the slag peels off. Become good. However, if it is less than o, ooi%, the above effect will not be observed, and if it exceeds 0.1%, the temperature cracking sensitivity of the welded metal will greatly increase by 1. Therefore, in the present invention, there are two types of hmma of S alone or a compound. Converting the above maxim 4 into a single unit p-shi is 0.0
The content was set at 01 to 0.1%. In particular, when an appropriate amount of B1, which will be described later, is added at the same time, the synergistic effect of both will significantly improve the releasability of cis-slag.

Here, the compound S refers to sulfides such as zinc sulfide, lead sulfide, iron sulfide, copper sulfide, norium sulfide, calcium sulfide, manganese sulfide, aluminum sulfide, calcium sulfate, norium sulfate, iron sulfate, and sulfuric acid. Sulfur such as lead, WljAk, alone or any compound has been found to be effective in stripping slag.

Next, when Bi is added, the melting point of the molten slag is lowered, the fluidity is improved, the interfacial tension is lowered, and the releasability of the slag is significantly improved, but if it is less than 0.001%, the above effect is not achieved. No particular effect can be expected even if sO is added in excess of 35Ak, and on the contrary, the shape of the pead will be slightly disturbed, so the upper limit is set at 0.3%.

Note that the Bi compound refers to bismuth metal, bismuth oxide, bismuth fluoride, bismuth sulfide, bismuth hydroxide, bismuth chloride, etc., and it has been found that either a single bismuth compound or any bismuth compound is effective for stripping slag.

TiO2 covers the weld metal uniformly, forms a complete slag with good followability, and improves the bead shape, but at 1% TiO2
If the amount is less than l, the effect will not be exhibited.

%, the amount of slag becomes too large and the slag tends to lead in the groove, causing defects such as slag entrainment. It is limited to 1 to 10% because TIO can be used alone or in combination with rutile, illuminite, titanium white, titanium slag, etc. It was found that the effects were the same when used in equal amounts.

sio forms a slag with good encapsulation and good concentration. However, the slag formed only from 8i02 and Tie tends to have problems in terms of flaking.9 By adding appropriate amounts of the aforementioned S and Bi, the slag coverage, followability, and sputtering condition can be improved. This makes it possible to significantly improve slag removal without causing any damage.

If the additive amount of 5102 is less than 1, the effect will be insufficient, and if it exceeds 7%, the slag will become hard and seize, which will actually cause a loss.

Limit to 0.1-7%.

In addition, 810. Silica sand, potash feldspar, mica, tartar, kaolin, zircon sand, etc. are used alone or in combination, but the amount added is sio,
It was found that the effect was the same in both cases when the same amount was used.

Zr01 smoothes the solidification of the slag, controls the viscosity of the slag, prevents the molten metal from dripping during all-position welding, and is effective in obtaining a good bead shape.

When the amount of kado is less than 1%, the effect is insufficient, and when it exceeds 5%, coagulation may be too rapid.
Since defects such as slag entrainment are more likely to occur,
01-5%. .

As ZrO2, zirconium oxide or zircon sand is used singly or in combination, but it has been found that the effect is the same when either a single substance or a compound is used in an equivalent amount in terms of ZrO2.

The deoxidizers Si, TJ, A/, Mll prevent blowholes and improve X-ray performance, but also TiUz
.

By adding an appropriate amount of these deoxidizing agents to the slag formation material, which is mainly composed of ZrO2f, the arc condition becomes better and the solidification state of the weldable metal becomes better in all position welding, making it easier to form a smooth and beautiful bead shape. If automatic welding equipment is used, long welding in all positions can be performed with high efficiency.

SM, Tj, AI! , M# is used singly or in combination with other metals, but if the amount added is less than 0.05%, deoxidation will be insufficient and the weld metal will become porous.
Line performance deteriorates.

On the other hand, if the content exceeds 3%, the deoxidizing element causes a decrease in the yield and cracking resistance of the weld metal and impairs the ductility of the weld metal, so it is limited to 0.05 to 3%.

The main components of the present invention are as described above, except that iron oxide and alumina are used to adjust the fluidity of the slag.

Magnesium oxide, and various compounds such as sodium fluoride and potassium titanate can be added to improve arc stability. Furthermore, Mn was added to adjust the composition of the weld metal.

Or, Nb*Mo, Nb, Ou, etc. can be added.

The outer skin is made of stainless steel, and the outer shell is made of austenitic, austenitic, ferritic, and ferritic stainless steel. Examples of its components are as follows: austenitic stainless steel contains 0116 to 26%, Ni3.
The main component is 5-22%.

Furthermore, Mo 1.2-6%, Oul-2.5%, NO
, 30% or less, NbO, 15% or less, or 1OxC% or more, 1Ti5XO% or more, and 0
0.15% or less, EN 5% or less, MnlO% or less, P
It contains 0.040% or less and 80.030% or less.

Austenitic/7-elite stainless steel is Ni3
~6%, 0r23~28%, Mo1~3% as main components, and o o, o s% or less, Sl1% or less, Mn
1.5% or less, P O, 040% or less, 80.030%
It contains the following:

7 elite stainless steel is 0r11.5~215%
is the main component, and MoQ is 75 to 2.5%.

AI! 0.10 to 0.30%, TI, Nb, Zr, or a combination thereof, containing 8×(0%×N%) to 0.80% singly or in combination, and CO112% or less, Sl1%
Below, Mo 1% or less, P 0.040% or less, So,
0.030% or less, and NO, 0.025% or less.

In addition, when Tsukuib is used as the outer skin, the outer diameter is 5 to 15 U, the wall thickness is 0.2 to 2 mm, and the outer skin is not formed using band steel.

If the thickness is 0.1 to 1. OMb width 5-12.5
It is preferable to form the steel strip into an outer diameter of 1.6 to 4 mm by using a steel strip of 1.6 to 4 mm.

Here, referring to an example of the manufacturing method of the stainless copper flux-cored shear wire of the present invention, when forming a 1 ft. outer sheath into a tubular shape from a steel band, mix and stir the filling flux into a groove formed into a 't-U shape. After filling the wire, it is formed into a round shape, drawn to a predetermined wire diameter, and dried at 10L1 to 500° C. for 30 minutes or more as necessary.

In addition, if the outer shell is a pipe, the flux is filled by vibrating the filling 7lux and/or tube.
If the filling slack is mixed and stirred and then filled, the filling will not be done smoothly, it will become uneven, or it will clog in the middle, making it impossible to fill.It is difficult to fill uniformly, but if the filling slack is wet-filled with water glass. By mixing and forming 5 grains, filling can be done smoothly and uniformly. Potassium silicate, sodium silicate, lithium silicate, etc. can be used as water glass. In the case of the 7 lux composition of the present invention, the amount of water glass added is from L5 to 100 kg of 7 lux.
About 71 is enough. After filling, the wire is drawn to a predetermined diameter and heated at 100 to 500℃ for 30 minutes depending on the required g.
It should dry for more than a minute.

The effects of the present invention will be described in more detail below using examples.

Table 1 shows the chemical composition of the stainless copper used as the outer skin.

Table 2 shows the composition of the shear wire containing slacks, which is a combination of the outer skin and the 7 lux filler.

The shape and dimensions of the outer skin are as follows:
9 #10 #11.12, 16.17, 20, 21
, 22゜23j 24 and 25 are made of a steel strip with a wall thickness of 0.2 M and a width of 8 u formed into an outer diameter of 2 to 2.2 Hφ, and wires with slacks are coded &3.4*13m14s1.
5.18 and 19 used pipes with an outer diameter of 12 gφ and a wall thickness of ``law''.

Table 73 shows the chemical composition of the base metal, and the plate thicknesses are 20 mm and 30 mm, respectively.

Table 4 shows the results of the narrow gap solution workability test, the vertical welding workability test results, the chemical composition of the deposited metal, and the hot cracking properties conducted using the flux shear wire shown in Table 2 and the base metal shown in Table 3. Show the test results.

Note that the narrow gap solution workability test was conducted using a wire diameter of 1.61r.
Using rInφ, welding position is downward, welding current is 300A,
Welding voltage 32■, welding speed 40 CWL/mln s
The power supply is a constant DC voltage, the polarity is reversed, and the shielding gas is 00.
, the gas flow rate was 20 t/min, and the groove shown in FIG. 2 was welded and tested.

In Fig. 2, the plate thickness @ = 3 Q ttvn, the groove angle θ = 20°, the shape R of the groove bottom has a radius of 2, the root face f = 3wi, and the root gap at this time was in close contact. b is a solid notching material, which was used to form the back bead of the first layer well.

The vertical welding workability test used a wire diameter of 1.2 m + nφ, a welding current of 150 A, a welding voltage of 26 cm, and a welding speed of 6 to 8.
crfL/min, power supply is DC constant voltage, polarity is reverse polarity, shield gas co, gas flow rate 2017m1
n, and the groove shown in FIG. 3 was welded.

In Figure 3, plate thickness t = 20 mm, groove angle θ-65
°, root face f = 1.5 rran, and root gap G = 5 trun. b is a knotting material and was used to form a good back bead in the first layer.

The chemical composition of the weld metal is determined by welding the groove shown in Figure 2.
Samples were taken from welded areas where the base metal would not be mixed.

The hot cracking susceptibility test was conducted after welding the first layer of the groove shown in Figure 2.
A dye penetrant test was conducted to investigate the presence or absence of cracks.

Flux wire symbols 1 to 10 are comparative examples, M,
Lx 1-25 are of the present invention.

As is clear from the results in Table 4, the wire of Otori 1, in which S and Bi were not added to the filler powder, had extremely poor slab peeling.

In the wire of cup 2, the added amounts of S and Bi are each 0.
When the content exceeds 10% or 0.3%, the slag peeling is good, but in the narrow groove solution workability test, the bead shape was disturbed and hot cracking was observed.

Kei 3's wire is T10. was less than 1%, and as a result of the poor encapsulation of the slag, the appearance of the peas was poor.

In case of F, 4, T i 02 exceeds 10% and the amount of slag is too large, resulting in poor slag peeling and poor pead shape.

In case 5, 5to2 was less than 0.01%, the slag encapsulation was poor, and the bead appearance was poor. E6 is 8ip2
If it exceeds 7%, the amount of slag is too large and peeling of the slag is poor.

In No. 7, ZrO2 was less than 0.1%, the solidification state of the molten metal was poor during vertical welding, and the bead shape was poor.

In case 8, the ZrO2 content exceeds 5%, the slag solidifies too quickly during vertical welding, and the bead shape is poor, which is dangerous.

/lL9 has a deoxidizer content of less than 0.05%, and the weld metal becomes porous due to insufficient deoxidation, resulting in poor X-ray performance.

In addition, the solidification state of molten metal is poor during vertical welding.
The peak shape was poor.

In L 10, the total amount of deoxidizing agents exceeded 3%, and the weld metal contained a large amount of St. 9, hot cracking occurred.

On the other hand, the wires of Melon 11-1 and 25 of the present invention both obtained good results in the narrow gap welding workability test and the vertical welding workability test, and cracked even in the hot cracking test. I can't see it.

As explained above, the 7 lux cored wire according to the present invention has T10. ．． 810B, Zr
By containing Os, S, Bi, and a deoxidizing agent within a predetermined range, the synergistic effect of these elements can improve the steel type,
Regardless of plate thickness or groove shape, slab peelability is good, welding workability in all position welding is excellent, and sound welds can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the Flaxman Siwire. FIG. 2 is a diagram showing a groove shape for a narrow gap welding workability test, and FIG. 3 is a diagram showing a groove shape for a vertical welding workability test. l...Outer skin, 2...Filling flux,
θ...Bevel angle, 几...Radius of the bottom of the groove, f...Root face, b...//
9 pieces and 7 pieces of material, T...Plate thickness 1g...Root gap. Agent Patent Attorney Masaaki Akizawa Mitsugai 2 Patent Commissioner General 1. Tenant Indication Patent Application No. 85589 No. 1985 2 Title of the invention Stainless steel slack-cored wire 3, Supplement 11 Relationship to the matter Applicant residence 191 (residence) 2 Otemachi, Chiyoda-ku, Tokyo Chome 6-3
No. Name (665) Nippon Steel Corporation 4,
Agent Residence: 5, Taiyo Building, 12-1, Honkyo Kabuto-cho, Chuo-ku, Tokyo, Ura: 1''+1iiiel'lil'11. +1. l:l,,l HfJ Showa year month date (shipment) correction
Content 1, page 2 of the specification, lines 14-15, "There is a problem with spacing, such as being narrow." is corrected to "There is a problem, such as being narrow." 2. At the end of page 15 of the same statement [Shield gas C02J is corrected as "Shield gas C02J.

Claims (2)

[Claims] (1) Inside the outer sheath made of stainless steel formed into a tubular shape, the total weight of one or more types of S alone or compounds is 0.001 to 8 when converted to 8 elements, based on the total weight of the wire.
Q, 1wt%, one or two of the old simple substances or compounds
The total number of species or more is 0.0 when converted to Bi alone. U U l~
0.3wt%, TiO21~lQwt%, 8 iol
0.1 to 7 wt%, and further Zr010. l ~5
wt % of the slab formation containing 84. Tl,l,M
A stainless steel flux-cored shear wire, characterized in that it is filled with a filling slack containing one or more deoxidizing agents of 0.05 to 3 wt% in total. (2) A stainless steel flux-cored wire according to claim 1, wherein the entire filling flux is wet mixed with water glass.