CN101249594A - Mild steel arc welding electrode containing lanthanum and Yt element - Google Patents
Mild steel arc welding electrode containing lanthanum and Yt element Download PDFInfo
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- CN101249594A CN101249594A CNA2008100200430A CN200810020043A CN101249594A CN 101249594 A CN101249594 A CN 101249594A CN A2008100200430 A CNA2008100200430 A CN A2008100200430A CN 200810020043 A CN200810020043 A CN 200810020043A CN 101249594 A CN101249594 A CN 101249594A
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Abstract
The invention discloses a low-carbon steel electrode comprising lanthanum and yttrium elements, and belongs to the technology field of welding materials. The main components (by weight) of the electrode coating are as follows: 8 to 9 percent of medium carbon ferromanganese, 20 to 29 percent of low carbon rutile, 6 to 9 percent of feldspar, 6 to 8 percent of mica, 7 to 10 percent of marble, 20 to 24 percent reduced titanium, 3 to 5 percent of white clay, 3 to 4 percent of bamboo powder, 3 to 3.6 percent of lanthanum and 0.5 to 0.7 percent of yttrium. The powder materials of the components are mixed uniformly, and then the power is press-coated on a 4mm diameter H08A welding core on a piston oil press using sodium silicate as binder to make low carbon steel electrode. The steel electrode has the following advantages: compared with prior E4303-type acidic electrode (low carbon steel electrode), the electrode maintains good welding processing performance of existing acidic electrodes; the impact power is increased by 35 to 43.8 percent; the elongation is increased by 20 to 35 percent; the tensile strength is increased by 10.9 to 12.8 percent; and the yield strength is increased by 10.6 to 11.8 percent.
Description
Technical field
The present invention relates to technical field of welding materials, specifically is a kind of mild steel arc welding electrode that contains lanthanum, yttrium.
Background technology
Existing E4303 type mild steel arc welding electrode is insensitive to the greasy dirt on the weldment, iron rust, and manufacturability is better; The molten point of acid slag is low, good fluidity, and the formation that helps taking off slag and weld seam, but but the defective that exists is to be difficult to effectively remove sulphur phosphorus impurities in the molten bath, cracking resistance is bad.So can only be used for the welding of general steel construction.When welding structure important or that crack sensitivity is bigger, often select the basic electrode of low hydrogen type for use, as E4315 etc., but this class usability of electrode is relatively poor, very sensitive to oil, rust and moisture, need oven dry 0.5～1h under 300～350 ℃ before the weldering, and need the butt joint groove to do thoroughly to clear up.And the price of basic electrode is 1.5 times of corresponding acidic electrode, thereby has increased production cost.
The ultralow hydrogen type electrode that has worked out at present (J * * * H), high-tenacity welding electrodes (J * * * GR) and high toughness super low hydrogen electrode (J * * * welding rod special for special such as RH), the price of these welding rods is more than 3 times of acidic electrode, though performance height, but price is also high, has therefore limited applying of these welding rods.
Through consulting document, the application in electrode coating of lanthanum, yttrium mostly is applied on the surfacing welding at present, several applications is also arranged on carbon steel, but does not find as yet lanthanum, yttrium are applied to bibliographical information on the E4303 type welding rod.
Summary of the invention
The purpose of this invention is to provide a kind of mild steel arc welding electrode that contains lanthanum, yttrium, solve the problem of E4303 (J422) welding rod cracking resistance difference.Compare the cost performance height with E4303 type welding rod.
The present invention adopts following technical scheme to realize: a kind of mild steel arc welding electrode that contains lanthanum, yttrium, comprise core wire and the extrusion coating on core wire, compositions of surfacing metal and weight ratio are: mid-carbon fe-mn 8～9%, low-carbon (LC) rutile 20～29%, feldspar 6～9%, mica 6～8%, marble 7～10%, reduction titanium 20～24%, chalk 3～5%, bamboo powder 3～4%, lanthanum 3～3.6%, yttrium 0.5～0.7%.
Preferred each component of electrode coating and weight ratio are: mid-carbon fe-mn 8.5%, low-carbon (LC) rutile 28.7%, feldspar 9%, mica 7%, marble 9%, reduction titanium 24%, chalk 5%, bamboo powder 3.7%, lanthanum 3.5%, yttrium 0.6%.
The medicinal powder material of said components is mixed the back make binding agent, on the H08A core wire that on the piston type hydraulic press at diameter is 4mm, make mild steel arc welding electrode its extrusion with sodium silicate.
Advantage of the present invention is: this welding rod is compared with existing E4303 type acidic electrode (mild steel arc welding electrode), kept the good welding technological properties of former acid welding rod, and ballistic work has improved 35～43.8%, percentage elongation has improved 30～40%, tensile strength has improved 10.9～12.8%, yield strength has improved 10.6～11.8%, and the welding rod manufacturing cost has only improved about 8.33%.
The specific embodiment
Below in conjunction with reference examples and embodiments of the invention the solution of the present invention and effect are further specified.
The present invention selects lanthanum, yttrium, by the mode of electrode coating transition rare earth element, with the mechanical property of improving welding rod and the structure property of deposited metal.The purpose of selecting acid slag system for use is to keep the good processing performance of former welding rod.
Reference examples:
With welding rod (the being E4303 type welding rod) coating recipe that do not add lanthanum, yttrium is reference examples.The prescription of reference examples is as shown in table 1.
Table 1 does not add the welding rod coating recipe of lanthanum, yttrium
Embodiments of the invention and result of the test: each embodiment is a basic recipe with the welding rod prescription in the table 1, adds lanthanum, yttrium.
Embodiment 1:
With the welding rod prescription in the table 1 is basic recipe, during by electrode coating transition lanthanum 3.1%, yttrium 0.5%, compare with the mechanical property of the welding rod deposited metal that does not add lanthanum, yttrium, new type of electrode is still insensitive to the greasy dirt on the weldment, iron rust, and manufacturability is better; Slag fluidity is good, and it is easy to take off slag, and appearance of weld is attractive in appearance, and its mechanical property especially impact absorbing energy has by a relatively large margin raising, and the result is as shown in table 2:
The deposited metal mechanical property relatively when table 2 reference examples and adding lanthanum 3.1%, yttrium 0.5%
Embodiment 2:
With the welding rod prescription in the table 1 is basic recipe, during by electrode coating transition lanthanum 3.2%, yttrium 0.6%, compare with the mechanical property of the welding rod deposited metal that does not add lanthanum, yttrium, new type of electrode is still insensitive to the greasy dirt on the weldment, iron rust, and manufacturability is better; Slag fluidity is good, and it is easy to take off slag, and appearance of weld is attractive in appearance, and its mechanical property especially impact absorbing energy has by a relatively large margin raising, and the result is as shown in table 3:
The deposited metal mechanical property relatively when table 3 reference examples and adding 3.2%, yttrium 0.6%
Embodiment 3:
With the welding rod prescription in the table 1 is basic recipe, during by electrode coating transition lanthanum 3.4%, yttrium 0.7%, compare with the mechanical property of the welding rod deposited metal that does not add lanthanum, yttrium, new type of electrode is still insensitive to the greasy dirt on the weldment, iron rust, and manufacturability is better; Slag fluidity is good, and it is easy to take off slag, and appearance of weld is attractive in appearance, and its mechanical property especially impact absorbing energy has by a relatively large margin raising, and the result is as shown in table 4:
The deposited metal mechanical property relatively when table 4 reference examples and adding 3.4%, yttrium 0.7%
Embodiment 4:
With the welding rod prescription in the table 1 is basic recipe, during by electrode coating transition lanthanum 3.0%, yttrium 0.7%, compare with the mechanical property of the welding rod deposited metal that does not add lanthanum, yttrium, new type of electrode is still insensitive to the greasy dirt on the weldment, iron rust, and manufacturability is better; Slag fluidity is good, and it is easy to take off slag, and appearance of weld is attractive in appearance, and its mechanical property especially impact absorbing energy has by a relatively large margin raising, and the result is as shown in table 5:
The deposited metal mechanical property relatively when table 5 reference examples and adding 3.0%, yttrium 0.7%
Embodiment 5
With the welding rod prescription in the table 1 is basic recipe, during by electrode coating transition lanthanum 3.5%, yttrium 0.6%, compare with the mechanical property of the welding rod deposited metal that does not add lanthanum, yttrium, new type of electrode is still insensitive to the greasy dirt on the weldment, iron rust, and manufacturability is better; Slag fluidity is good, and it is easy to take off slag, and appearance of weld is attractive in appearance, and its mechanical property especially impact absorbing energy has by a relatively large margin raising, and the result is as shown in table 6:
Table 6 does not add the comparison with the mechanical property of the welding rod deposited metal that adds lanthanum, yttrium
The Finder-1000 type X-ray energy spectrometer of employing BeiJing ZhongKe technology Co., Ltd carries out scanning analysis to the deposited metal field trash, and (acquisition condition: accelerating potential is 20.00keV, live time is 44 seconds, the angle of emergence is 35.00 degree), electronic energy spectrum is as shown in drawings.Its analysis result is as shown in table 7.Show as can be seen that from the experimental data of table 7 relatively surplus is less with the actual addition 3.5% of lanthanum for the degree of lanthanum in weld seam, this be since when welding the factors such as part scaling loss when natural cause, rare earth adding electrode coating cause.This explanation is in molten drop inside, and rare earth oxide, rare-earth sulfide and rare-earth oxide sulfate major part that inner each reflection in molten bath generates enter residue, and small part remains in becomes field trash in the weld seam.Relatively ratio error is very big for the actual addition 0.6% of yttrium content and yttrium in the table 7, and poly-partially phenomenon causes owing to yttrium has in deposited metal for this.
Table 7 electronic energy spectrum analysis result
Learn that from above analysis when lanthanum accounts for the weight 3.5% of electrode coating, yttrium accounted at 0.6% o'clock, comprehensive mechanical properties such as deposited metal tensile strength, impact flexibility are best.
Select to add lanthanum, yttrium, but the amount of lanthanum, yttrium should be suitable, otherwise can worsen the mechanical property of deposited metal.When lanthanum content in the coating 3～3.6%, yttrium content mechanical property of usability of electrode energy and deposited metal 0.5～0.7% time is better.The rolling mill practice of new type of electrode is identical with the rolling mill practice of common mild steel arc welding electrode (as E4303 type welding rod).After adding Rare Earth Lanthanum, yttrium,, can play the effect of desulfating and deoxidation change inclusion morphology because rare earth element generates high-melting-point and oxide, sulfide and oxygen sulfur compound etc. that at high temperature plasticity is very little with oxygen and sulphur easily.Add the microscopic structure that an amount of lanthanum, yttrium can the refinement deposited metals, can reduce the hydrogen in the deposited metal, thereby significantly improve the impact flexibility of deposited metal.
New type of electrode is compared with corresponding basic electrode, possesses the cracking resistance of basic electrode, and its price is 75% of a corresponding basic electrode.New type of electrode is compared with existing E4303 type acidic electrode (mild steel arc welding electrode), kept the good welding technological properties of former acid welding rod, though comparing with acidic electrode, the welding rod manufacturing cost improved 8.33%, but its cracking resistance has improved 38.8%, the cost performance height, so this welding rod has good industrial prospect.
Description of drawings:
Accompanying drawing is the weld seam electronic energy spectrum of embodiment 5.
Claims (2)
1. a mild steel arc welding electrode that contains lanthanum, yttrium comprises core wire and the extrusion coating on core wire, it is characterized in that: mixed by the medicinal powder material of following each component and make acid coating, each component of coating and weight ratio are: mid-carbon fe-mn 8～9%, low-carbon (LC) rutile 20～29%, feldspar 6～9%, mica 6～8%, marble 7～10%, reduction titanium 20～24%, chalk 3～5%, bamboo powder 3～4%, lanthanum 3～3.6%, yttrium 0.5～0.7%.
2. the mild steel arc welding electrode that contains lanthanum, yttrium according to claim 1, it is characterized in that each component of electrode coating and weight ratio are: mid-carbon fe-mn 8.5%, low-carbon (LC) rutile 28.7%, feldspar 9%, mica 7%, marble 9%, reduction titanium 24%, chalk 5%, bamboo powder 3.7%, lanthanum 3.5%, yttrium 0.6%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101954554A (en) * | 2010-09-19 | 2011-01-26 | 山东建筑大学 | Acid electrode with good process performance |
| CN101733574B (en) * | 2009-12-01 | 2011-09-07 | 武汉铁锚焊接材料股份有限公司 | High-strength and high-flexible acid electrode for ships |
| CN102814599A (en) * | 2012-08-13 | 2012-12-12 | 江苏大学 | Welding wire for oxide dispersion strengthen (ODS) alloy melt welding |
-
2008
- 2008-03-21 CN CNB2008100200430A patent/CN100553857C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101733574B (en) * | 2009-12-01 | 2011-09-07 | 武汉铁锚焊接材料股份有限公司 | High-strength and high-flexible acid electrode for ships |
| CN101954554A (en) * | 2010-09-19 | 2011-01-26 | 山东建筑大学 | Acid electrode with good process performance |
| CN102814599A (en) * | 2012-08-13 | 2012-12-12 | 江苏大学 | Welding wire for oxide dispersion strengthen (ODS) alloy melt welding |
| CN102814599B (en) * | 2012-08-13 | 2015-07-08 | 江苏大学 | Welding wire for oxide dispersion strengthen (ODS) alloy melt welding |
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| CN100553857C (en) | 2009-10-28 |
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