CN1336264A - Composite welding rod contg. shielding gas and welding agent for heat-resisting steel - Google Patents

Composite welding rod contg. shielding gas and welding agent for heat-resisting steel Download PDF

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Publication number
CN1336264A
CN1336264A CN01123730A CN01123730A CN1336264A CN 1336264 A CN1336264 A CN 1336264A CN 01123730 A CN01123730 A CN 01123730A CN 01123730 A CN01123730 A CN 01123730A CN 1336264 A CN1336264 A CN 1336264A
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welding
content
solder flux
resisting steel
heat
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CN01123730A
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CN1191912C (en
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金周晳
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Hyundai Welding Co Ltd
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Hyundai Welding Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

Provided is a composite wire for gas shield arc welding for heat resistant steel, which can obtain welded metals with superior impact toughness at low temperatures while preventing cracks during welding operation. The flux of composite wire for gas shield arc welding comprises C 0.01-0.15%, Mn 0.5-1.5%, Si 0.3-1.0%, Cr 1.0-5.0%, Mo 0.4-1.5%, Ti 0.01-0.1%, Fe 10-20%, N 0.004-0.02%, 0.05-0.30% of two or more compounds selected from K2O, Na2O, Li2CO3 and TiO2, a balance of Fe and other inevitable impurities. Herein, total amount of metal powder is adjusted to be 95-98wt.%, based on the total weight of the flux.

Description

Contain the composite electrode of the heat resisting steel of gas shield with solder flux
Technical field
The present invention relates to the composite electrode that contain gas shield solder flux of heat resisting steel with the steel welding.In more detail, the present invention relates to not only obtain the good weld metal of low-temperature impact toughness, but and the heat resisting steel that contains gas shield that is used for the heat-resisting steels welding of multilayer welding that relates to the good welds operation with the composite electrode of solder flux.
Background technology
In the past contain the welding rod that rutile is a solder flux, because of containing Cr, Mo, Al, C, Si, S, P, B, metals such as Nb, slag inclusion forms a large amount of crackles that cause when causing sclerosis and welding.Specifically, rutile in the past is the welding rod of solder flux, is the formation of slag inclusion, has added a large amount of slag inclusion and has formed agent, and this slag inclusion forms that agent is partly transferred in the weld metal and crackle when causing welding.
Therefore, form agent, adopt the construction method of cancellation preheating and weld heating, but do not solve root problem for removing slag inclusion.
And rutile in the past is the welding rod of solder flux, because only be used for hot environment, do not require its low-temperature impact toughness, and now, the temper embrittlement weld metal that the huge and high temperature and high pressure environment of works produces descends its low-temperature flexibility, and these problems have seriously limited its use.
Therefore, for improving the shortcoming that rutile is the welding rod of solder flux, promptly the low-temperature impact toughness characteristic improves welding efficiency and maximum productivity, presses for the composite electrode that exploitation contains solder flux.
Summary of the invention
For this reason; the present invention proposes for the problem that solves above-mentioned conventional art; the generation of crackle when not only preventing to weld promptly is provided; and obtain weld job and productivity is good; the weld metal that low-temperature impact toughness is good is provided for the composite electrode that contains the gas shield solder flux that heat-resisting steels welds thus.
For achieving the above object, the invention provides heat resisting steel with the composite electrode that contains the gas shield solder flux, it is characterized in that with respect to welding rod each constituent content weight % is, by C:0.01～0.15%, Mn:0.5～1.5%, Si:0.3～1.0%, Cr:1.0～5.0%, Mo:0.4～1.5%, Ti:0.01～0.1%, Fe:10～20%, the metal dust that N:0.004～0.02% constitutes; From K 2O, Na 2O, Li 2CO 3And TiO 2The middle arc stabilizer of selecting two or more compositions, it adds up to content is 0.05～0.2%; F:0.05～0.30%, and the solder flux of composition such as other unavoidable impurities is filled with, and with respect to the gross weight of above-mentioned filling solder flux, the content of controlling above-mentioned metal dust adds up to 95～98%.
At first, the composite electrode that contains heat resisting steel with solder flux of the present invention, it is characterized in that the generation of crackle when suppressing welding and guarantee complete metal solder, preferably suitably control the metal dust in the flux constituent that is filled in the metal sheath, can prevent the increase of the diffusivity amounts of hydrogen of weld metal thus.
And, the invention is characterized in that be the impact flexibility of guaranteeing more than the 40J at-20 ℃, control forms the nitrogen content of nitride.
The solder flux constituent that constitutes welding rod of the present invention, i.e. metal dust at first are described below.
C forms carbide when being the welding after-baking, and the element of intensity and draftability is provided.But when its content was lower than 0.01%, hot strength reduced, and is difficult to keep engineering properties under the high temperature, and impact flexibility reduces sharply; And when its content surpassed 0.15%, hot strength increased severely, and the possibility that crackle takes place is arranged, and extensibility also descends.Therefore, preferably to control C content be 0.01～0.15% in the present invention.
It is 0.5～1.5% that Mn preferably controls its content in the present invention.When its content is lower than 0.5%, because of the not enough reduction that produces impact flexibility of deoxidation, or is difficult to guarantee required intensity, and when its content surpasses 1.5%, has because of heat treated crackle.
It is 0.3～1.0% that Si preferably controls its content in the present invention.When its content is lower than 0.3%, produce defective and intensity decline because of deoxidation is not enough, be difficult to guarantee elevated temperature strength.In addition, when its content surpasses 1.0%, produce temper embrittlement, impact flexibility reduces, and crackle takes place during welding.
Cr at high temperature has good stability, and the creep strength height combines with C during heat treatment, forms carbide, improves intensity, and improves the effective element of oxidative resistance, and preferably controlling its content is 1.0～5.0%.When its content is lower than 1.0%, can not get desired effect; When its content surpassed 5.0%, weld crack took place.
Mo has the characteristic that is similar to above-mentioned Cr, and high-temperature stability is good, particularly can improve high temperature creep strength on a small quantity, improves the effective element of hot strength.And, combine with C during heat treatment, form carbide, improve intensity.Preferred its content of control is 0.4～1.5% among the present invention.When its content is lower than 0.4%, can not get desired effect; When its content surpasses 1.5%, weld crack and impact flexibility take place reduce.
Ti uses as deoxidier, improves the effective element of impact flexibility and intensity.When its addition is lower than 0.01%, can not get desired effect; When its addition surpassed 0.1%, not only welding arc was unstable and increase the sputter generating capacity, and the slag inclusion amount increases severely.For this reason, preferred control Ti content is 0.01～0.1% among the present invention.
Fe is the composition that increases welding efficiency and improve arc stability, and preferred its content of control is 10～20% among the present invention.Because, when its content is lower than 10%, not only welding efficiency reduces, and generation slag inclusion amount increases and fissility is abominable, thereby influences the welding bead outward appearance, and when its content surpasses 20%, the metal dust beyond the Fe and relative minimizing of amount of arc stabilizer, cause the unsettled bad weld job of electric arc, the defective possibility that weld metal takes place increases, and hot strength sharply reduces.
In addition, in the above-mentioned compositional system, the oxygen content by the control weld metal below 1000ppm, thereby improve the impact flexibility of heat resisting steel welding material, guarantee-20 ℃ low-temperature flexibility.
Therefore, the invention is characterized in, be the impact flexibility of guaranteeing more than the 40J at-20 ℃, form nitride with the control nitrogen content, afterwards, the impact flexibility of weld metal when improving heat treatment.
Specifically, because nitrogen causes temper embrittlement when heat treatment, it is extremely important suitably to control its amount.That is, suitable nitrogen amount with combinations such as Cr, Ti, forms nitride when the welding after-baking, and the miniaturization tissue improves impact flexibility.
Preferred control nitrogen content is 0.004～0.02% among the present invention.Because, when its content is lower than 0.004%, do not form the nitride of appropriate amount, can't guarantee good impact flexibility; And when its content surpasses 0.02%, produce the crackle of weld metal, and produce the gas hole defect that causes by nitrogen, produce the sharp increase of hot strength and reducing sharply of extensibility.
In addition, among the present invention, require to control above-mentioned metal dust total content 95～98% with respect to solder flux weight.Because, when its total content is lower than 95%, excessively forming slag inclusion, the welding bead outward appearance is coarse; And when its total content surpassed 98%, because of sputter takes place excessively, not only the welding bead outward appearance was coarse, and the possibility of generation defective is very big.
The solder flux of forming welding rod of the present invention also contains K 2O, Na 2O, Li 2CO 3, TiO 2Deng arc stabilizer.Preferably from K 2O, Na 2O, Li 2CO 3, TiO 2Select two or more compositions in the arc stabilizer of forming, total amount is limited in 0.05～0.2% scope.Because when its total amount was lower than 0.05%, arc stability was low, the sputter generating capacity is excessive; And when its total amount surpassed 0.2%, the slag inclusion generating capacity was too much, causes bad peeling off, and the welding bead outward appearance is coarse.
Welding rod of the present invention also contains F.
Fluorine (F) is that the protection weld metal is not subjected to the influence from the nitrogen and the oxygen of atmosphere, improves the element of the anti-defective of weld metal.But when its content is lower than 0.05%, can not get above-mentioned effect; And when its content surpasses 0.03%, the electric arc instability, the slag inclusion generating capacity is too much, causes bad peeling off, and the welding bead outward appearance is coarse.
In addition, contain the solder flux of the present invention of all said components, preferably the relative welding rod gross weight of its content is 15～25%.Because when its amount is lower than 15%, do not reach purpose of the present invention; And when its amount surpasses 25%, forming too much slag inclusion, the welding welding bead is coarse.
Description of drawings:
Fig. 1 is the skeleton diagram of the welding base metal shape used in the embodiments of the invention.
The specific embodiment
Embodiment
Prepare respectively the solder flux such as following table 1 composition, be filled in outside the steel that forms such as following table 2 On the skin, obtain respectively the welding rod that contains the heat resisting steel flux for solder of diameter 1.2mm.
In addition, with the above-mentioned welding rod that contains solder flux, with Fig. 1 shape, in about 150 ℃ of preheatings The upper welding of welding base metal (ASTM A387 Gr.11), its concrete welding condition such as following table 3. Then, the weld metal that obtains, the speed heating with 160 ℃/hour keeps approximately at 620 ℃ After 60 minutes, with 60 ℃/hour cooling velocity, be cooled to 300 ℃, implement afterwards air cooling.
For estimating the engineering properties of the weld metal that obtains thus, take respectively the examination of weld metal Test sheet, it is implemented tension test and Cha Baishi impact test, its result such as following table 4.
The welderings such as electric arc, welding bead outward appearance, sputter and slag inclusion fissility when in addition, it being welded Connect operation, with the naked eye compare, its result divides well (◎), outstanding (zero), common (△) With bad (*), such as following table 4.
Result from above-mentioned stretching experiment obtains observes section, measures the defective occurrence degree, its Same good (◎), outstanding (zero), common (△) and bad (*) of dividing of result, as follows Face table 4.
[table 1]
Distinguish The composition of solder flux (% by weight) M *(％)
The metal dust composition Arc stabilizer   F Remainder
  C   Si   Mn   Cr   Mo   Ti   N   Fe
Embodiment   1   0.05   0.5   1.2   1.1   0.54 0.02   0.006 13.05     0.08 0.22 0.234   96.7
  2   0.04   0.6   1.4   1.2   0.40 0.03   0.004 12.73     0.10 0.09 0.406   96.3
  3   0.10   0.6   0.7   1.4   0.40 0.08   0.010 13.12     0.15 0.15 0.290   96.1
  4   0.14   0.8   1.1   1.3   0.51 0.01   0.020 12.58     0.05 0.10 0.390   96.8
  5   0.02   1.0   1.3   1.1   0.52 0.05   0.015 12.58     0.08 0.05 0.285   97.3
  6   0.01   0.8   0.5   1.0   0.53 0.04   0.008 13.36     0.20 0.28 0.272   95.3
  7   0.015   0.9   1.3   1.4   0.58 0.01   0.009 12.24     0.18 0.07 0.296   96.7
  8   0.08   0.4   0.8   1.5   0.45 0.05   0.018 12.93     0.07 0.30 0.402   95.2
Comparative example   1   0.11   0.8   1.5   1.3   0.44 0.10   0.015 12.97     0.08 0.01 0.175   97.9
  2   0.15   0.9   0.6   1.2   0.45 0.09   0.014 12.90     0.15 0.41 0.136   95.4
  3   0.07   1.0   1.2   1.0   0.45 0.04   0.005 12.86     0.03 0.10 0.245   97.6
  4   0.05   0.8   1.1   1.4   0.46 0.02   0.010 12.51     0.24 0.15 0.260   96.1
  5   0.04   0.7   0.8   1.2   0.48 0.06   0.001 13.30     0.09 0.07 0.259   97.2
  6   0.08   0.8   0.6   1.1   0.46 0.05   0.025 13.14     0.12 0.08 0.545   95.3
  7   0.03   0.3   0.7   1.3   0.45 0.03   0.015 12.58     0.17 0.27 1.155   90.4
  8   0.13   0.4   1.5   1.4   0.46 0.09   0.014 12.87     0.06 0.06 0.016   98.7
*Arc stabilizer is from K in the above-mentioned table2O、Na 2O、Li 2CO 3、TiO 2Select the total content of two or more compositions in the group that forms, M*It is the metal with respect to the gross weight of solder flux The % by weight of powder.
[table 2]
    C     Si     Mn     P     S
    0.01-0.08 0.01-0.05     0.1-1.0 0.02 below 0.02 below
[table 3]
Welding current/voltage Use gas Gas flow Speed of welding
/ 28～31 volts of 270～290 peaces Ar(80％)＋CO 2(20％) 20～25 liter/mins of clocks 25～40 cm per minute
[table 4]
Distinguish Weld job Anti-defective The character of machinery
Electric arc The welding bead outward appearance Sputter The slag inclusion fissility Hot strength (N/mm2) Impact strength (20 ℃, J)
Embodiment   1     ○     ◎   ○   ○     ○ 598   55
  2     ◎     ○   ○   ○     ○ 610   44
  3     ◎     ○   ○   ○     ◎ 659   64
  4     ○     ○   ◎   ◎     ◎ 632   41
  5     ○     ○   ○   ◎     ○ 645   58
  6     ○     ○   ○   ○     ◎ 591   60
  7     ◎     ◎   ○   ○     ○ 608   63
  8     ◎     ◎   ○   ○     ◎ 587   48
Comparative example   1     ○     ○   ○   ○     × 592   58
  2     ×     △     ×   ×     ◎ 604   60
  3     ×     ○     ×   ○     ○ 612   50
  4     ◎     △     ○   ×     ○ 603   64
  5     ◎     ○     ○   ◎     ○ 584   34
  6     ◎     ○     ○   ◎     × 652   30
  7     ○     ×     ○   △     ○ 646   58
  8     △     ×     ×   ○     × 630   60
From above-mentioned table 1 and table 4, can find out, the most suitable according to the embodiment of the invention (1～8) When the total content of metal dust in solder flux composition and the solder flux is controlled on ground, obtain having good mechanical The weld metal of matter, and weld job and anti-defective are also good.
In contrast, F content is at the comparative example (1～2) of the scope of the invention, its anti-defective Property and weld job are bad, and the arc stability agent content is not at the comparative example of the scope of the invention (3～4), its weld job is bad.
In addition, at the comparative example (5～6) of the scope of the invention, its all impacts are not strong for nitrogen content Spend bad, below 40J, and in the solder flux metal dust total content not at the ratio of the scope of the invention Routine (7～8), its weld job is bad.
Same as above, the invention provides the most suitably to control it and form and metal dust content The composite electrode that contains heat resisting steel usefulness solder flux of solder flux filling, crackle is sent out in the time of can preventing from welding thus Give birth to and weld defect, and can improve weld job, obtain the good weldering of low-temperature impact toughness Connect metal.

Claims (1)

1. contain the composite electrode of gas shield heat resisting steel with solder flux, it is characterized in that with respect to welding rod, each components contents weight % is, by C:0.01～0.15%, and Mn:0.5～1.5%, Si:0.3～1.0%, Cr:1.0～5.0%, Mo:0.4～1.5%, Ti:0.01～0.1%, Fe:10～20%, the metal dust that N:0.004～0.02% constitutes; From K 2O, Na 2O, Li 2CO 3, and TiO 2The middle arc stabilizer of selecting two or more compositions, it adds up to content is 0.05～0.2%; F:0.05～0.30%, and the solder flux of composition such as other unavoidable impurities is filled with, and with respect to the gross weight of above-mentioned filling solder flux, the content of controlling above-mentioned metal dust adds up to 95～98%.
CNB011237309A 2000-07-28 2001-07-26 Composite welding rod contg. shielding gas and welding agent for heat-resisting steel Expired - Lifetime CN1191912C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR43615/2000 2000-07-28
KR10-2000-0043615A KR100502572B1 (en) 2000-07-28 2000-07-28 Composite Wire for gas shield arc welding for heat resistant steel

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CN1336264A true CN1336264A (en) 2002-02-20
CN1191912C CN1191912C (en) 2005-03-09

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0813432B2 (en) * 1991-03-28 1996-02-14 株式会社神戸製鋼所 Flux-cored wire for carbon dioxide shield arc welding for Cr-Mo steel
JP2614969B2 (en) * 1993-03-31 1997-05-28 株式会社神戸製鋼所 Gas shielded arc welding titania-based flux cored wire
JPH08108296A (en) * 1994-10-06 1996-04-30 Nippon Steel Weld Prod & Eng Co Ltd Flux cored wire for welding cr-mo low-alloy heat resistant steel
KR100189298B1 (en) * 1996-12-24 1999-06-01 홍상복 Hardfacing wire
KR100294454B1 (en) * 1997-03-27 2002-11-18 가부시키 가이샤 고베세이코쇼 Flux-cored wire for electrogas arc welding

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