SA06270412B1 - Sintered Flux for Submerged Arc Welding - Google Patents

Abstract

Sintered Flux for Submerged Arc Welding Abstract The present invention relates to a sintered flux for submerged arc welding comprises: from 12 to 24% by weight SiO2, 24 to 38% by weight wt.% Al2O3, 6 to 13 wt.% TiO2, 2 to 9 wt.% CaO, 7 to 14 wt.% CaF, 12 to 23 wt.% MnO, 2 to 17 wt.% MgO, and 1 to 5% by weight of Na2O, K2O, Li2O, or mixtures thereof. The basicity (B) of the sintered flux molten, Formula 1 satisfies the following: 26.5 . Furthermore, the sintered flux used in submerged arc welding comprises 5 wt% or less of particles larger than 1 mm, and 90 wt% or more particles of 0.2 to 1 mm in diameter. mm, to 5 wt% or less of particles and particles smaller than 0.2 mm. Therefore, sintered flux can be used for welding structures, bridges, pipes, ships, marine structures, etc..., made of steel, which need good weld-forming ability even when welding at high speed.

Description

: ' Fused Flux for Submerged Arc Welding Sintered Flux for Submerged Arc Welding Full Description

Invention background

The present invention relates to a sintered flux flux used in electric arc welding

Submerged arc welding comprises, more specifically, a molten arc welding

It is used in submerged arc welding of light steel and high-tensile steel (Je) steel ° which is estimated at Oc kg ft / “aa ¢ used in structures, bridges, pipes and ships

marine structures; etc; manufactured from steel and the molten flux is capable of

good arc stability; Good resistance to pockmark defeats

resistance (blister marks); Good slag detachability

The metal “pled” has good resistance to etching and reaches a good granular shape when used in sally at high speed.

Submerged arc welding is one of the welding methods in which a flux is distributed

powder of a certain thickness on a part to be welded; An electrode wire is inserted into the flux aid and generated

An electric spark (an electric arc) between the tip of a wire and a base metal creates heat

resulting from the electric spark on the wire melting; base metal; Melting assistant. The vo from the molten flux results in the formation of “slag” and the molten metal results in the formation of a weld pellet.

. and in submerged arc welding.” Whereas the welding arc is generated in the flux; It does not expose Jos ll to the outer surroundings. in submerged arc welding; And since the flux sintered flux is not in Alla molten at the moment of welding start; It does not pass any electric current. And therefore; to facilitate the generation of M0 arc (spark); A steel wool is inserted between the base metal and the wire; Or the frequency of Je is used. When the arc is generated, Jala slag and a gas are generated from the heat of the arc and help. The amalgam used in submerged arc welding comprises can be classified as molten arc or molten arc depending on the method of manufacture. The molten auxiliary material is made by mixing raw materials ¢, melting them, and cooling them in an electric furnace; Then it is crushed to a predetermined particle size and this leads to obtaining the shapes of a powdered glass body. The molten flux has the advantages of a homogeneous chemical composition; And the relative ease of slag detachability and the lack of moisture adsorption, which allows jew to be stored and treated; and consistency of yo particle size and composition when ale) is used. cad 3) Whereas, molten flux is formed during Af a high-temperature melting process; It is impossible to add any deoxidizer or any alloying element. And this Cua colina that the necessary alloy element must be supplied from wire; It is important to choose the wire properly in Als use of fusible flux aid. Yes

¢ The particle size of the molten flux affects the melting point of the flux; and in any state of gaseous discharge; Jey the shape of the granule and the finer the particle; The greater the current applied to the -particles and when a high current is applied to the large flux particles; It is possible to damage the arc protection device; This makes the pellets coarse; It generates defects such as pores and undercuts. The molten auxiliary is manufactured by crushing raw materials and alloy elements to reach a suitable size, then mixing them together and adding sodium silicate fia to bind them together to a certain size. Then it is dried and melted in a range of temperatures in which the raw materials do not decompose. Whereas it causes 0 slight loss of Fe-Si Jie deoxidizer, 0-74 or annealing agent for Ni Jie, Cr ¢, Mo, 7; of sintered flux fusing aid; It is easy to deoxidize the molten metal, control the chemical composition of the deposited metal ¢, and control the microstructure of the deposited metal - vo, and for this The molten flux mainly uses high-tensile steel, Je, and low alloy steel, which needs strong deoxidation or adjusting the chemical composition. On the “sal” side, the molten refractory has disadvantages represented in the disadvantages of relatively easy adsorption and the change of the chemical composition of each layer in the multi-layer in multi-Yr welding.

layer welding ¢ and the difficulty of reusing it as it rots after using it for the first time. Therefore, the sintered flux must be selected, processed, stored and used; Carefully. Bina Engineers are looking to increase welding speed and improve productivity when constructing structures, bridges, pipes, ships and marine structures; made of steel; using submerged arc welding comprises 0 but when welding at high speeds using sintered flux flux is traditional in submerged arc welding; it is difficult to achieve electric arc stability, pockmark resistance, slag detachability, pit resistance, and reaching the particle shape, and this reduces formability. thusing lowering welding workability and productivity | Submerged electric arc and suitable for light steel and high-tensile steel 0, which is estimated at 00 kg ft / pa ¢ and enables good arc stability » and good resistance to defeats pockmark resistance [ traces of pockmark resistance _sil ] ; good slag detachability (leftover from smelting ore); Good resistance to being cial) and reaching granule shape when used in high speed welding.

To reach the previous goals; The molten flux used in submerged arc welding according to a representative embodiment of the present invention comprises 11 to 774 by weight of 0:8; and YE to 778 wt. of AOr, 1 to 717 wt. of ,110, 1 to 749 wt. of CaO, 7 to 714 wt. of CaFy, 11 to 7277 wt. of CaFy MnO© and “to 7017 by weight of MgO and 1 to 70 by weight of 118.0 or 16.0 or 1120 or a mixture thereof. preferably; The sintered flux used in submerged arc welding according to the present invention; It is characterized by the fact that the basicity (B) expressed by formula 1 lies in the range of who? to Se 0 [Formula 8 de ACaF2+ MnO), with CaO + MgO and better; that the molten flux used in submerged arc welding according to the invention Jal contains 75 by weight or less of particles larger than 1 mm; and 0 by weight or ST thereof of particles ranging in diameter from 107 to 1 mm; and 759 ve by weight or less of particles smaller than 0.7 mm. ,b8:0: 11 to 774 wt Yeu

SiOy is considered an acidic component, and it works to adjust the basicity, viscosity, and melting point of molten slag to form a uniform bead of 0 shape. 510 may be added in the form of oxide or an oxide compound of (5:07) 003:12 Quartz Jay 0 (5:07)., (0N) and Wollastonite (CaSiOr). and when the flux contains 7117 wt. or less of SiO, it is likely to form aggregate pellets or bottom cavities due to non-AAS viscosity and irregular particle width; Convex beads are born due to lack of diffusion. When the flux contains by weight or more SiO, the alkalinity of the molten slag decreases and 0 oxygen increases in the precipitated metal; this spoils the toughness. In addition to this, the viscosity increases greatly, which generates irregular pellets Ye ALO, to 778 by weight, 1.0 is a natural component necessary for slag formation and adjusts the basicity of slag shape 10680 to improve weld formability Vo 1,0 adjusts the viscosity and melting point of slag; improves arc concentration and stability wl - Welding with “dle” current, which improves the ability to form the weld. Lovie flux contains 774 by weight or less than AlOr Both the viscosity and the melting point decrease, which makes the grain width irregular, as well as the grains and generates defects such as pockets (YT) ‏

A

The degree of ALOr increases and when the flux contains 778 or more of . lower undercuts heat-hardening; causing deformation of the granule; The viscosity also increases, which leads to the formation of spheroids or causes slag. Convex beads Aluminum oxide and “(AlyOreYH:O) Bauxite derivation: from sources such as Say oo (ALLOr) by weight 71 to 1:170, and a slag-generator as it works to transfer 11 to an acidic component. 110. An acidic component is considered the slag detachability of the welded metal during welding in order to improve the toughness and the ability to remove slag -welded metal. welded 0 to 7% by weight or less than 110.7; It is possible that the flux contains Lovie's flux; and impart toughness of the welded metal and may form cavities slag detachability increased slag removal potential 0 reduced lower TiOy moreover when flux contains 717 wt. or more causing beads with rough electric arc is not stable; Which makes the pellets with coarse grains 1 0 5, which increases the possibility of (Ti). In addition, the welded metal contains an excessive amount of + low-temperature cracks, cracks occur at low temperatures.

Yeu q -(FeTiOr) Imenite «(TiO+) Rutile from sources such as TiOy can be derived to 79 by weight 1 cao and in reducing ¢ viscosity and viscosity bead shape is a key component useful in controlling the basicity of CaO 0 is considered in the molten metal »causing an increase in the bladder efficiency of the welded metal oxygen, this creates an effect «CaO on 7 by weight or less than flux and when the flux contains © the particle shape “CaO is weak. When the flux contains 74 by weight or more of viscosity, it deforms and the weld formation buoyancy is negatively affected, which leads to the generation of turbulence; the viscosity increases, which makes the pellets irregular. From sources such as CaO, it is possible Derivation - Wollastonite (CaSiOy), Dolomite (MgCOyr=CaCOy), Anorthite (CaO°AlyOyeY SiOy), 1 wt. 7104, km: 7 to To reduce pressure, fluorine gas is a useful alkaline component in improving slag liquefaction; The generation of CaFy is considered efficient in the precipitated metal. Partial hydrogen of the vapor; resulting in a reduction of the amount of Cay, this has a weak effect when the flux contains 77 by weight or less than with respect to blocking the welded metal. when the flux contains 714 by weight or more than 1 the arc is not stable and the particle is deformed; A gas is generated causing CaF + undercuts to have a distinctive odor; aftershocks and undercuts are generated.

a CaF , can be derived from Fluospar (CaFy) Jie sources . MnO: 11 to 77 by weight MnO is a useful base ingredient in improving particle shape and adjusting the melting point and viscosity of slag during high speed welding. E and when the flux contains 717 by weight or 3 th of MnO ; This makes a weak effect. and when the flux contains 77 by weight or more MnO ; 0 reacts significantly with a molten fraction causing significant deformation of the particle shape or significantly negatively affecting slag detachability 0 slag detachability MnO can be derived from sources such as Ferro-Manganese 0 (MnO) Manganese oxide 7211 JY MgO 0 by weight MgO is a useful alkaline component in increasing the alkalinity of fused slag; It moves hydrogen in the metal into the slag; Which reduces hydrogen and improves durability. When the flux contains 77 by weight or less of MgO, its effect is insufficient so that the slag sticks to the surface of the welding balls, which affects the possibility of its removal. and when 0 the flux contains 717 by weight or more of MgO the electric arc is unstable resulting in the formation of convex globules; The melting point of slag increases significantly; Which negatively affects the possibility of its removal. Yeu

11

Magnesite (MgCOy), Magnesia clinker (MgO), from sources such as MgO 0 Dolomite (MgCOy>CaCOy), can be derived by wt / o to yo: or 1+0 or 110 or a mixture thereof 170 18.0, 620 and 11.0 or a mixture of terminations are important components for achieving electric arc stability; specifically; maintain arc stability during welding at high speed. o or LivO by weight or less than 118.0 or 16.0 or 71 on flux and when the flux contains a terminating mixture the arc stability is significantly reduced; weld penetration is reduced; This causes and when the flux contains 75 by weight or more of . slag inclusion

Like convex beads or a mixture of which NayO convex spheroids are formed, which affects the possibility of weld formation; And the electric arc is not very stable, which reduces the resistance of 0 moisture adsorption and 6 water glass Jie water glass _from LivO, KO and NayO sources and can be derived; Which is used in the manufacture of Cryolite Auxiliary (NarAlF+), Potassium titanate (K+TiOy), 11-51, molten arc welding auxiliary. At the same time; In addition to what the melting aid contains from the previous formula; Preferably ve

Le AY in the range from 1 expressed by the basic formula (B) to 1 [formula > 2(CaF2 + MnO) this is CaO + MgO

Ye

VY

They are chemical components with a low melting point; MnO and CaFy 6) in the formula are chemical constituents with a high melting point. Therefore the ratio between MgO and CaO (percentage of MgO and CaO (percentage by weight) to the sum of MnO and CaFy is the sum of the sintered flux in the flux fluidity of the slag by weight); on the melting and liquefaction point of the slag according to the invention, submerged arc welding, used in the current submerged arc welding. As a result of this, the ability to form the weld is affected, such as the stability of the electric arc; the removeability and shape of the granule; etc.; to a great extent. For this reason, it is possible to reduce 0 slag detachability fluidity of the slag for the purpose of controlling the melting point and liquefaction of slag 1 from the range of values for the appropriate weight formula among the chemical components with a low melting point daw on the presence of 86 chemical components with a high melting point; which can reach 0 ¢ forming ability and good slag removal ability “good arc stability” and good particle shape; etc.; This is what is required in the present invention. As a ratio by weight between the chemical components having 1 and when the baseness is (8); Expressed by the formula Low melting point and high melting point chemical components; Less than 9 the particle shape, Wa removal ability and slag viscosity increase significantly; which affects lead point vo -pockmarks defeats are likely lly and moreover . slag detachability When the basicity (8) is greater than 1.0, the arc stability decreases; This reduces the melting point of slag and negatively affects the ability to remove slag

Ye)

Therefore 0 to obtain a molten flux used in submerged arc welding having good weld-forming ability even during high-speed welding” Rule (B) defined in the present invention shall be in the range of ? to 0 and to reach the weld forming potential; Such as good electric arc stability and good slag removal capability; the shape of the granule (cand), etc.; as required by the present invention; the completed melt aid should have an appropriate particle size distribution; And when the melting aid does not have an appropriate particle size distribution; The arc protection is negatively affected and the pellets become coarse; Defects such as pores and undercuts are likely to appear and any suitable particle size distribution may include sintered flux used in dl 5 submerged arc welding comprises of the above chemical formula and has the aforementioned (B) alkalinity of 75 wt. or less of particles larger than 1 mm; and 7950 wt or more particles with a diameter of 17 to 1 mm 0 and Te wt or less particles smaller than 0.7 mm. and when Sidi flux particles larger than 1 mm over 75 wt.; The distance vo between the particles becomes too large and the arc protection decreases; This makes the pellets coarse and easily crumbles. Moreover when it represents flux particles with a diameter of 1 to 1 mm; less than 7900 wt.; Convex beads are generated, and the granules become coarse. daly when flux aid particles smaller than 17 mm represent more than 705 wt.; And where it does

Yeu

V¢ The gas generated during submerged arc welding is discharged; sufficiently It generates slag AY, and in addition to this, this negatively affects ih and may generate clip . detachability The specific weld properties of the flux of the present invention will be understood by the following embodiments. 0 hereafter; Representative embodiments of the present invention will be described in detail; Under no circumstances should the scope of the invention be considered. Tags The following description has been considered after samples of a melting agent have been manufactured that have the chemical compositions and alkaline values mentioned in the table. the following 1 No. 01; The water glass was dried, and after distributing the particles of the flux compounds #10 in water glass to obtain a fusible arc welding agent used for arc welding, the water glass was sintered and sintered with the compositions listed below. The abbreviation “15:0” listed in Table 1 indicates that FeO and BaO are conclusively present in mixtures of 0,2 and 1 in every flux formulation.

Yi

, : [Schedule No. 1] 1470 or Class 1.0 or Etc) MgO| MnO |CaFy|CaO|TiOy|AlyOy| SiOy | Total LiyO or ah, I am with me when I am with you. L a z [sia count the horizon ve mata cov As for the Aree revel cor you died what ah ce a mah [1a navel safari] cen ove hee ven ree afr env for ne [ene] ces | ree for pele] ee 8+ = example of the invention; *CE = Comparative Example Welding Wire Welded; mentioned in a table? subsequent with a base metal listed in the following Table 1; Using flux compositions listed in Table 1. YET

He then mentioned the welding conditions in the following table ¢ and recorded the results of evaluating the possibility of forming the weld in the tables from © to 1. And in the tables from © to 7; The test results for the ability to form welds at welding speeds of Yoo cm/min are reported; and Yo. cm/min; and Yoo cm/min; And at the same polarity, current and voltage. The symbols shown in the tables from © to 1 have the following meanings: m >: good; 0 : normal; #” : Weak [Table 1] Steel 1 Thickness (mm) Chemical composition of the base metal; Percentage by weight or by weight [Table No. [V] Wire diameter (mm) Chemical composition of the wire; Weight Percentage NNN [Table ¢] 2k | to test ad | Lond) 03 | (cm/min) [el Yeo current | 18. 01 06 7 vo. | On the basis of reciprocating layer welding ‎Ye

[0 [Table No. cm/min.‎ 001 - volts VE - p 1761010: AC + © ampere] welding conditions arc stability fall form resistance slag rating resistance to slags slag Detachability oo oe |e my oo oo | oo mr oo |e | eo ara op ole le |e [me el oo le le |e [me] ole |e lo |e [my ole Le fe Te [my oo le le |e [ma] el ole 1 oo |e [ my

ERE Er rT ele lo |e [eo elo le |e [a [eer eo le [eo |e] ele [ee [a [cee ele |e fe [eo Jan elo le fe Te] ev

ES EN EE Let us be ele fe | «| they are]

YET

VA

] 6 [Table No. cm/min. Yoo — volt VE - ampere 750 cad sia 1761: current √ welding conditions arc stability resistance etching resistance particle shape | slag Classification malignancy ° Electrophoretic detachability eo Le fe [Te [mr]

Ceo le be Te [mr eo | oo le lo |e er faq |e Te Te [me ole |e |e |e [me vo |e |e] [oe |e [mv of oo Le |e |e [my oe le be le [ en ole le le |e tooth IES EEE EE del Er rT ee be Te Te amr e |e [oe |e Jer x |e le Te eee ele be bee [ems ele oe Lox |e [eer ele oe [oe fe ey] ee lox fe Ten

Celebe Toe [en

[V [Table No. cm/min. Yoo - Volt VE - Ampere Yoo cay sie current : Welding conditions Realizing that representative models of the present invention eo and by reference to Tables From © to Arc stability Grain shape ial resistance | slag Rank Resist defeats! Electroslag detachabilit cle fe le [ele

Ce | oo |e |e |e [mr ee Le l [mr oo |e |e |e [me aq |e le fe fe [me]

Ce le |e |e |e Ten ele |e fe le Tey

Ce |e |e |e | ah [ma

Ce le |e |e ame ma aa aa [en xe aa Te Tae

Ce |e |x Le x Ten ele fox fe [x [an

Yel

Y. It has good weld forming ability; any; arc stability; resistance to shocks; the possibility of removing; And the shape of the particle even when the pit resistance and pitting resistance are increased ¢ slag detachability slag detachability Welding speed. Since the content of 0:5 is greater than the specific range 1 in the case of the comparative example No. (B) less than the range of the present invention; and basic CaO of the present invention; and the content of 0 as defined herein is greater than the range of the present invention; The results recorded in slag table © related to arc stability, earthquake resistance, and slag removal capacity cm/min; not good. Premium 001 and the shape of the beloved; at a welding speed of 062 cm/min; This increased from 151 on this table 6+ shows that when the welding speed increased to 1 it shows that when the welding speed increased the deterioration of the resistance to defeats and the ability to remove slag. And the; schedule 0 cm/min; The stability of the electric arc was also negatively affected. 001 to greater than the range of ALLOY and since the content of oY and in the case of the comparative example number is less than the range of the present invention; The MRO results of the present invention; The content of GAREY cm/001 listed in Table 0 and related to particle shape at a welding speed of cm/min; 010 was not good. In addition to this, the table “shows that when the welding speed is increased to ve weak; Table 7 indicates that when the slag detachability increased, the slag removal potential became cm/min; This increased the deformation of the particle. 001 Welding speed to 110 Whereas the content is greater than the range of oF and in the case of comparative example No. of the present invention; and the content of 118.0 or 16.0 or 0,:A or a mixture thereof is less than the specific range, the results in Table © relating to the arc stability and Jad form of the invention ©

P the particle at a welding speed of 100 cm/min; not good. In addition to this, Table + shows that when the welding speed is increased to 1501 cm/min; Results regarding granule shape became poor; Table 7 indicates that when the welding speed is increased again to 701 cm/min; This negatively affected the stability of the electric arc.

0 and in the case of comparative example No. of and where the content of ,5:0 is less than the range of the present invention; The results recorded in Table © related to the shape of the particle at a welding speed of 100 cm/min; not good. In addition to this, Table 1 shows that when the welding speed is increased to 1051 cm/min; Results regarding granule shape became poor (weak); Table 7 indicates that when the welding speed is increased again to Yoo cm/min; Results regarding pellet shape remained poor

0 (weak). In the case of comparative example No. 0 and the CaFy content being less than the range of the present invention; and the content of MnO is greater than the range of the invention Jad the results reported in a table of cul jel strength, slag detachability ¢ and particle shape at a welding speed of 100 fan min; Not good. Moreover, Figure 1 shows that when the welding speed is increased to 151 cm/min; The slag removal ability deteriorated by oof and Table 7 indicates that when the welding speed was increased again to 100 cm/min; The shape of the granule was affected

a pal all is less than the range ALO; In the case of the comparative example No. ; Whereas the content of and the content of 080 are greater than the range of the present invention; The results are Mal) by the invention

0, which is listed in a table related to pockmark resistance; And the shape of the pellet at speed

Oh

YY

welding of 001 cm/min; not good. In addition to this, Figure 1 shows that when the welding speed is increased to Yoo cm/min; resistance to defeats became weak; Table 7 indicates that when the welding speed is increased again to 701 cm/min; The shape of the pellet was also negatively affected. In the case of comparative example No. 7; Whereas the content of MEO is greater than the range of the present invention; and the basicity (B) as defined herein is less than the range of the present invention; The results recorded in Table * related to resistance to shocks. slag detachability; the shape of the particle at a welding speed of 100 cm/min; not good. In addition to this, a table shows that when the welding speed was increased to A880 [Yoo], the cil resistance became weak; Table “ indicates that when the welding speed is increased again to 001 cm / 0 min; This affected Lhe on both the etching resistance and the particle shape. and in the case of comparative example No. eA, where the content of 0:1 is less than the range of the present invention; and the content of 118.0, 16.0, 11.0, or a mixture thereof is greater than the range of the present invention; The results recorded in Table 0 related to the stability of the electric arc; the possibility of removing slags; The drilling resistance at an ore velocity of 100 cm/ARES is not good. In addition to this, ve Table 1 shows that when the welding speed is increased to 100 cm/min; slag removal capability becomes poor; Table 7 indicates that when the welding speed is increased again to Yoo cm/min; The arc stability La is affected and in the case of comparative example No. 8 and since the content of CaFy is greater than the range of the present invention; and the content of MgO is less than the range of the present invention; and the basic (B) LS© defined herein is greater than the range of the present invention; The results are posted in

YY

Table related to the electric arc stability, slag removal ability, particle shape, and hertz resistance cm/min; not good. In addition to this, 001 de yu welding at pockmark resistance cm/min; The stability of the electric arc has become 151. When the welding speed is increased to 1, a table of cm/min appears; effect 001 weak; Table 7 indicates that when the welding speed is increased again, this negatively affects the possibility of slag detachability. The sintered flux used in ill submerged arc welding comprises exemplary model 1 given in Table 1; which satisfies the basic inequality ? < 8 - CaO) [(MnO + CaFY) 1 + to > (MgO) to eight flux particle size distributions; shown in Table A and the results of the weldability evaluation of the fused flux used are shown In submerged arc welding, which is characterized by the particle size distributions shown in Table A in Table No. 4. The welding conditions were AC - Vou Ampere - VE Volt = 001 cm / min. The symbols used in Table 4 has the following meanings: ix dle :0 das to weak vo 2 Ye

[Table No. [A] [Table No. 3] Electrocardiogram row | Defeats detachabilit excavations | e Tv] Slow down Le |e Te |e i.e. Ce lel eo [ee Tew Ce Jel ee Te Ter eT a aq a x Ce x |e Te Tee Cox Le | Tae Tae ah | A with reference to Tables A and 1; It can be seen that the invention Mal provides good arc stability.” good shock resistance; good slag detachability da glia i slag detachability good catalyst and good particle shape; This is when the fusing aid contains sintered flux

Yo

Zo on submerged arc welding comprises used in submerged arc welding by weight or more than 7400 mm; over 1 particle by weight or less than particle mm; and on 78 by weight or less particles 001 to 17 particles with a diameter of 0.7 mm smaller than 0.7 mm in Alls Comparative Example No. 01 shown in Table oA and where that the content of particles larger than 1 mm is in excess of the range of the present invention; Table 4 shows weak results related to the stability of the electric arc; Pockmark resistance and the shape of the beloved. and in the case of Comparative Example No. 11 shown in Table A, wherein the content of particles (i) of 117 mm is in excess of the range of the present invention; Table 4 shows weak results related to pockmark resistance and drilling resistance. and in the case of Comparative Example No. 1 shown in Table A, wherein the content of particles larger than 1 mm is in excess of the range of the present invention; and the particulate content of 1-7 mm to 1 mm in diameter is less than the range of the present invention; Table 9 shows weak results related to arc stability, resistance to shocks, and slag detachability Kis 1 granular. and in the case of Comparative Example No. 1” shown in Table A and since the content of particles with a diameter of between 17 mm and 1 mm is less than the range of the present invention; and the content of particles smaller than 117 mm is in excess of the range of the present invention; Table 1 shows weak results related to impact strength, slag removal ability, pitting resistance, and particle shape.

As is clear from the above; The present invention provides a chemical composition used in a sintered flux molten aide that is used in submerged arc welding comprises and is characterized by a basicity (B) that achieves the inequality oe) 2 (CaF2 + MnO): >y =F 27 q.0> 3 5 wt or less n particles CaO + MgO ; and contains fo by weight or less than m particles larger than 1 mm; at 7490 wt or more particles of Yow to 1 ca in diameter and at To by weight or less of particles smaller than 0.7 mm. According to this, it is possible to obtain a sintered flux molten auxiliary used for submerged arc welding, characterized by a good ability to form the weld; i.e. the stability of the electric arc; ela yell resistance and slag detachability; pit resistance and particle shape; Even at 0 increments in welding speed. Although the present invention has been described with reference to certain representative embodiments thereof; Ald those with experience in the art may understand that de gia modifications and changes may be made to the present invention without departing from the content or scope of the present invention which is specified in the enclosed claims; And what rewards her. \o YE).

Claims (1)

YY elements_ides-1 1 fused flux auxiliary sintered flux JL all submerged arc welding comprises Y contains: 11 to 774 by weight, 0:58; and YE to AYA wt AKOr 5 wt IVY to TiOy * to 74 wt; from 0e; and 7 to 714 by weight from 7©; and 11 to 777 wt. of 0000 and * to 0 717 wt. of MgO and 1 to 70 wt. of 118.0, 16.0, 14.0, or a mixture thereof. 1 "- sintered flux for use in submerged arc welding comprises of claim 1; Cus check basic (B) ¥ for sintered flux fused ; the following 1 formula: 3 [Formula] 1d and ACaF2+ MnO), b CaO + MgO 1 ¥—sintered flux for submerged arc welding welding comprises 1 0 according to claim 1 or oY where - sintered flux used in submerged arc welding comprises ¢ contains 5 by weight or less particles 0 larger than 1 mm; 7980 wt or more particles of 0.7 1 to 1 mm in diameter; 70 wt or less particles smaller than 0.7 mm. ‏