CN102114566A - Backing welding method of Cr-Mo heat-resistant steel pipelines without protective solid welding wires on back - Google Patents
Backing welding method of Cr-Mo heat-resistant steel pipelines without protective solid welding wires on back Download PDFInfo
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Abstract
The invention provides a backing welding method of modified Cr-Mo heat-resistant steel pipelines without protective solid welding wires on the back. According to the American Cr-Mo heat-resistant steel welding standards of AWS A5.28-``2005 and ASME SFA5.28-05, solid welding wires of ER80S-G and ER90S-B9 are selected to match with He-rich polynary mixed protection gases of (He+Ar+CO2) and a narrow gap U-shaped splicing bevel groove with the width of 1-1.5 mm and used for welding the modified Cr-Mo heat-resistant steel pipelines of ASTM A335-P11 and ASTM A335-P91. With the method provided by the invention, the pre-welding preparation workload and the cost for inflating protection gas can be effectively reduced, the production efficiency can be greatly increased and the production cost can be decreased. Because no protection gas needs to be filled in the pipelines, the invention is particularly suitable for on-site aloft work and the welding construction of long-distance modified Cr-Mo heat-resistant steel pipelines and has the advantages of simple and reliable process, high production efficiency and favorable welding process performance.
Description
Technical field
The present invention relates to the welding field of metal material installing engineering, be specifically related to be applied to the welding in the modified form martensite chrome molybdenum heat resisting pipe road of all kinds of heating of petrochemical industry, cracking furnace pipe.
Background technology
The welding of modified form chrome molybdenum heat resisting steel pipeline is made up of backing welding, filling weldering and three aspects of cosmetic welding usually, and wherein backing welding is a ring of most critical in the modified form chrome molybdenum heat resisting steel pipeline solder technology.Because backing weld seam back side high-temperature oxydation problem; it is a key technology difficult problem that is difficult to satisfactorily resolve always; particularly in the welding job of high-altitude, long-distance pipe fixing port, also be difficult to guarantee the hundred-percent no high-temperature oxydation of welding quality even fill the method for protective gas in taking to manage.
Usually take the back side to fill the welding method of protective gas: the non consumable arc welding electrode argon tungsten-arc welding of solid core welding wire; it is the common technology of the modified form chrome molybdenum heat resisting steel pipeline welding of present standard; the caliber that is suitable for Φ 20～Φ 500mm, the welding of the modified form chrome molybdenum heat resisting steel pipeline that wall thickness 〉=3mm is above.But general pipeline back side applying argon gas, nitrogen, nitrogen hydrogen mixeding gas are protected.Normally the sealing mouth of pipe directly fills protection gas, the equivalent deaeration, reach the regular hour after (can't detect the concentration of protective gas usually, generally rule of thumb grasp) by the welder just can weld no quantitative technical guarantee.
Fill the solder technology technology of protection gas in the pipeline, preparation is comparatively loaded down with trivial details before the weldering, and not only consuming time also is great to the waste of resource simultaneously.When applying argon gas, nitrogen protection; owing to do not have deoxidation or dehydrogenation measure; therefore the degreasing before the welding, preparation such as eliminate rust, anhydrate are strict very loaded down with trivial details again, because complex process, welding efficiency is low thereby greatly increased the amount of labour, has improved production cost.During the construction of high-altitude especially at the construction field (site), long-distance pipe, it almost is impossible hundred-percent accomplishing that protection gas is filled at the back side, and construction quality usually is subjected to very big influence.
Summary of the invention
At above the deficiencies in the prior art, the invention provides that a kind of technology is simple, high efficiency, welding technological properties be good, is exclusively used in modified form chrome molybdenum heat resisting pipe back side unprotect solid core welding wire backing weld method.
The present invention is achieved by the following technical solutions:
Modified form chrome molybdenum heat resisting pipe back side unprotect solid core welding wire backing weld method; cooperate the polynary hybrid protection gas of rich helium with chrome-molybdenum steel solid welding wire ER80S-G or ER90S-B9; carry out the bottoming welding of modified form chrome molybdenum heat resisting steel class pipeline according to SH/T3520-2004 standard and conventional welding parameter, take welding rod to fill and cover welding according to the wall thickness of pipeline again.
The polynary hybrid protection gas of wherein rich helium comprises that volumn concentration is that 82～92% He, volumn concentration are 6～12% Ar, and volumn concentration is 2～6% CO
2
Described ER80S-G or ER90S-B9 chrome-molybdenum steel solid welding wire are according to U.S. AWS A5.28-" 2005 and ASME SFA5.28-05 chrome molybdenum heat resisting steel welding standard select for use.
Described modified form chrome molybdenum heat resisting steel class pipeline is ASTM A335-P11 and ASTM A335-P91 modified form chrome molybdenum heat resisting steel pipeline.
For reaching more excellent welding technological properties, modified form chrome molybdenum heat resisting steel pipeline used in the present invention, its group is 1～1.5mm to back U type groove gap, is lower than national standard 2～2.5mm.
Applying silicon of the present invention, chromium, molybdenum, all higher U.S. AWS A5.28-of nickel content " 2005, ASMESFA5.28-05 modified form chrome molybdenum heat resisting steel the solid welding wire ER80S-G and the ER90S-B9 that make, cooperate the polynary hybrid protection gas of rich helium (He+Ar+CO
2) and width be the narrow gap U type butt joint groove of 1～1.5mm, be used for the welding of ASTM A335-P11, ASTM A335-P91 martensite modified form chrome molybdenum heat resisting steel pipeline.
The martensitic structure of steel is the supersaturated solid solution of carbon in α-Fe, so martensite has very high hardness and intensity, and hardness is the highest in the austenite transmutation product.But because martensite transfor mation is carried out at a lower temperature, carbon atom and iron atom all can not spread, and finish by the shear mode so the lattice of the iron of martensite in transition process is reorganized, so martensite transfor mation is typical non-diffusion transformation.Therefore at the welding of martensite modified form chrome molybdenum heat resisting steel pipeline, with the great difference of being welded with of other steel pipeline, difference is as the maximum of martensite steel and austenitic steel: austenitic steel in welding process for preventing to produce intercrystalline crack, must control heat import, must not preheating before the welding, should control interlayer temperature, little electric current, rapid welding, cooling fast; Martensite steel in welding process for prevent to produce cold crack, again must preheating before hot tearing system line and temper brittleness, the welding, the control interlayer temperature, must carry out post weld heat treatment.And the filling metal of weld seam should be controlled at minimum capacity in the welding process, takes the narrow gas tube butt joint of U type groove so require emphasis.
AWS A5.28-" 2005, the diameter of ASME SFA5.28-05 modified form chrome molybdenum heat resisting steel solid core welding wire ER80S-G, ER90S-B9 is Φ 2.0mm, Φ 2.4mm.
1, diameter is the welding wire of Φ 2mm, and its welding variables is as follows:
Welding current: 85A～125A weldingvoltage: 8V～14V
Multi component mixed gas body flow: 10～16L/min
2, diameter is the welding wire of Φ 2.4mm, and its welding variables is as follows:
Welding current: 95A～145A weldingvoltage: 10V～16V
Multi component mixed gas body flow: 16～20L/min
Solid core welding wire ER80S-G, ER90S-B9 are according to U.S. AWS A5.28-" 2005 and ASME SFA5.28-05 chrome molybdenum heat resisting steel welding standard select for use; the amount of being rich in silicon, chromium, molybdenum, nickel; can increase on the one hand the flowability of weld metal; help the effusion of gas; and increase the toughness of deposited metal, avoid the formation of fire check; On the other hand, in welding process, the silicon of back of weld is preferential and airborne oxygen combination when high temperature, has played the effect of protection sealing run metal, helps preventing the formation of back of weld metallic high temperature oxidation.
The effect and the percent by volume of the polynary hybrid protection gas of the rich helium that is used to weld (He+Ar+CO2) are:
Helium He: be monatomic inert gas, thermal conductivity factor is big, and its biggest advantage is an electric arc when burning in He gas, and arc temperature is higher, and arc voltage is also higher, and therefore, the input of mother metal heat is bigger, thereby can improve the fusion penetration in weld metal molten bath.Add rich helium in the multi component mixed gas body, can improve speed of welding, can therefore can reduce the high-temperature residence time of pipeline sealing run metal near the speed of welding twice of argon tungsten-arc welding usually, help preventing the oxidation of sealing run metal.Proportioning volumn concentration: 82～92%.
Argon Ar: monatomic inert gas, thermal conductivity factor is very little, is difficult for dividing heat of desorption during high temperature.Therefore arc burning is highly stable in the argon gas, and the heat scattering loss is also less, and when doing protection with argon gas, the protection gas hood of formation also makes it be difficult for dispersing floating, can prevent the intrusion of the oxygen molecule in the atmosphere, makes electric arc more stable.In addition, add argon gas in the mist, also can reduce and splash.Proportioning volumn concentration: 6～12%.
(He+Ar) mist also can improve the formation of weld penetration, minimizing pore and boost productivity.
Carbon dioxide CO
2: oxidizing gas adds CO in the mist
2Gas, one side can improve the dynamics of electric arc, increases fusion penetration, improves the melting efficiency of welding wire and the adhesion of mother metal molten bath atom, can overcome bad problems such as negative electrode drift phenomenon and appearance of weld again on the one hand.Proportioning volumn concentration: 2～6%.
Beneficial effect of the present invention is:
The present invention adopts the AWS A5.28-according to the U.S. " 2005, ASME SFA5.28-05 chrome molybdenum heat resisting steel welding standard selects for use solid core welding wire ER80S-G, ER90S-B9 to cooperate the polynary hybrid protection gas of rich helium (He+Ar+CO
2) and width be the narrow gap U type butt joint groove of 1～1.5mm; be used for the welding of ASTM A335-P11, ASTM A335-P91 modified form chrome molybdenum heat resisting steel pipeline; the protective gas protection is exempted to fill in the back side; broken through the argon tungsten-arc welding bottoming welding procedure of applying argon gas protection in traditional pipe; the molten bath is high-visible; modified form chrome molybdenum heat resisting steel backing welding connection technology level is stepped a stage, opened up an energy-saving and cost-reducing space.
The expense that this method can effectively reduce the preparation amount before the weldering and fill protection gas increases substantially production efficiency, reduces production costs.Need not protective gas because of in managing, be particularly useful for on-the-spot work high above the ground, long welding procedure apart from modified form chrome molybdenum heat resisting steel pipeline.Therefore adopt the present invention, simple and reliable process, the production efficiency height, welding technological properties is good.
The specific embodiment
One, welding procedure test
For guaranteeing that welding quality takes method of comparative analysis, carry out welding procedure test.Difference according to grade of steel, carry out one group of traditional argon tungsten-arc welding respectively, the method that the rich helium gas mixture arc-welding of corresponding tungsten electrode is three groups is carried out the physics and chemistry contrast test, this group test is by state approval, and qualified physics and chemistry detects unit and detects, provides legal physics and chemistry, Non-Destructive Testing report.
Test the 1st group: modified form chrome molybdenum heat resisting steel pipeline mother metal is U.S. ASTM A335-P11.Its chemical composition is as shown in table 1.Tube groove and button are chosen according to the GB4334.5-90 standard.
Welding example (1): the back side is filled the argon tungsten-arc welding (testing by the SH/T3520-2004 standard) of 99.9%Ar argon shield and is used U.S. AWS A5.28-" 2005 modified form chrome molybdenum heat resisting steel solid core welding wire ER80S-G (diameter of phi 2.4mm).Concrete welding condition is as follows: welding current: 75A～110A, weldingvoltage: 9V～12V, gas flow: 8L/min～12L/min, welding equipment adopt the inversion argon arc welding machine, and the electric current kind is straight polarity direct current.
Welding example (2): protection gas is not filled at the back side, adopts the polynary hybrid protection gas of rich helium, and match ratio is: the helium percent by volume is 82%; The argon gas percent by volume is: 12%; The carbon dioxide percent by volume is 6%; Use U.S. AWS A5.28-" 2005 modified form chrome molybdenum heat resisting steel solid core welding wire ER80S-G (diameter of phi 2.4mm).Concrete welding condition is as follows: welding current: 80A～120A, weldingvoltage: 12V～18V, gas flow: 10L/min～14L/min, welding equipment adopt the inversion argon arc welding machine, and the electric current kind is straight polarity direct current.
Welding example (3): protection gas is not filled at the back side, and adopt the polynary hybrid protection gas of rich helium, match ratio: the helium percent by volume is 86%; The argon gas percent by volume is 10%; The carbon dioxide percent by volume is 4%; Use U.S. AWS A5.28-" 2005 modified form chrome molybdenum heat resisting steel solid core welding wire ER80S-G (diameter of phi 2.4mm).Concrete welding condition is as follows: welding current: 80A～120A, weldingvoltage: 12V～18V, gas flow: 14L/min～18L/min, welding equipment adopt the inversion argon arc welding machine, and the electric current kind is straight polarity direct current.
Welding example (4): protection gas is not filled at the back side, and adopt the polynary hybrid protection gas of rich helium, match ratio: the helium percent by volume is 92%; The argon gas percent by volume is 6%; The carbon dioxide percent by volume is 2%; Use U.S. AWS A5.28-" 2005 modified form chrome molybdenum heat resisting steel solid core welding wire ER80S-G (diameter of phi 2.4mm).Concrete welding condition is as follows: welding current: 80A～120A, weldingvoltage: 12V～18V, gas flow: 16L/min～20l/min, welding equipment adopt the inversion argon arc welding machine, and the electric current kind is straight polarity direct current.
Test the 2nd group: modified form chrome molybdenum heat resisting steel pipeline mother metal is: U.S. ASTM A335-P91, its chemical composition is as shown in table 1.Tube groove and button are chosen according to the GB4334.5-90 standard.
Welding example (5): the argon tungsten-arc welding (being undertaken by the SH/T3520-2004 standard) that the 99.9%Ar argon shield is filled at the back side uses U.S. ASME SFA5.28-05 modified form chrome molybdenum heat resisting steel solid core welding wire ER90S-B9 (diameter of phi 2.4mm) welding that feels secure to fill and cover welding with ASME SFA5.5-06 modified form chrome molybdenum heat resisting steel welding rod E9015-B9 welding rod (diameter of phi 3.2mm Φ 4.0mm).Concrete welding condition is as follows: welding current is respectively: 75A～95A 110A～160A, weldingvoltage are respectively: 8V～12V 24V～28V, gas flow: 8L/min～12L/min, welding equipment adopt the inversion argon arc welding machine, and the electric current kind is straight polarity direct current, reversal connection.
Welding example (6): protection gas is not filled at the back side; adopt the polynary hybrid protection gas of rich helium; match ratio is: the helium percent by volume is 82%; the argon gas percent by volume is 12%; the carbon dioxide percent by volume is 6%, and welding feels secure with ASME SFA5.25-06 modified form chrome molybdenum heat resisting steel welding rod E9015-B9 (diameter of phi 3.2mm Φ 4.0mm) in welding to use U.S. ASME SFA5.28-05 modified form chrome molybdenum heat resisting steel solid core welding wire ER90S-B9 (diameter of phi 2.4mm) to feel secure.Concrete welding condition is as follows: welding current is respectively: 80A～100A 110A～160A, weldingvoltage are respectively: 12V～16V 24V～28V, gas flow: 10L/min～14L/min, welding equipment adopt the inversion argon arc welding machine, and the electric current kind is straight polarity direct current.
Welding example (7): protection gas is not filled at the back side; adopt the polynary hybrid protection gas of rich helium; match ratio is: the helium percent by volume is 86%; the argon gas percent by volume is 10%; the carbon dioxide percent by volume is 4%, and welding feels secure with ASME SFA5.5-06 modified form chrome molybdenum heat resisting steel welding rod E9015-B9 (diameter of phi 3.2mm Φ 4.0mm) in welding to use U.S. ASME SFA5.28-05 modified form chrome molybdenum heat resisting steel solid core welding wire ER90S-B9 (diameter of phi 2.4mm) to feel secure.Concrete welding condition is as follows: welding current is respectively: 80A～100A 110A～160A, weldingvoltage: 12V～16V 24V～28V, gas flow: 14L/min～18L/min, welding equipment adopt the inversion argon arc welding machine, and the electric current kind is straight polarity direct current.
Welding example (8): protection gas is not filled at the back side; adopt the polynary hybrid protection gas of rich helium; match ratio is: the helium percent by volume is 92%; the argon gas percent by volume is 6%; the carbon dioxide percent by volume is 2%, and welding feels secure with ASME SFA5.5-06 modified form chrome molybdenum heat resisting steel welding rod E9015-B9 (diameter of phi 3.2mm Φ 4.0mm) in welding to use U.S. ASME SFA5.28-05 modified form chrome molybdenum heat resisting steel solid core welding wire ER90S-B9 (diameter of phi 2.4mm) to feel secure.Concrete welding condition is as follows: the welding current difference: 80A～100A 110A～160A, weldingvoltage difference: 12V～16V 24V～28V, gas flow: 16L/min～20L/min, welding equipment adopt the inversion argon arc welding machine, and the electric current kind is straight polarity direct current.
More than among test the 2nd bond pads example 5-8, because the P91 steel pipe of choosing is Φ 219 * 15.09mm, steel pipe walls is too thick, therefore according to normal welding sequence, backing welding adopts welding wire, and filling and cover welding must be selected Φ 3.2, Φ 4.0 welding rods, could guarantee welding quality.
The chemical composition of table 1 U.S. ASTM A335--P11 and P91 modified form chrome molybdenum heat resisting steel steel pipe
Two, welding performance test
Postwelding carries out Non-Destructive Testing, physics and chemistry mechanical property test:
U.S. ASTM A335-P11 modified form chrome molybdenum heat resisting steel welding joint mechanical property test result sees Table 2.
U.S. ASTM A335-P91 modified form chrome molybdenum heat resisting steel welding joint mechanical property test result sees Table 3.
Macroscopic view metallographic intercrystalline corrosion performance test is tested according to GB4334.5-90:
U.S. ASTM A335-P11 modified form chrome molybdenum heat resisting steel welding point macroscopic view metallographic intercrystalline corrosion The performance test results sees Table 4.
U.S. ASTM A335-P91 modified form chrome molybdenum heat resisting steel welding point macroscopic view metallographic intercrystalline corrosion The performance test results sees Table 5.
From above-mentioned test comparing result as can be seen, the performance of welding point meets the pertinent regulations of AWS (American National Standard), GB (CNS) fully.
Table 2 U.S. ASTM A335--P11 modified form chrome molybdenum heat resisting steel Steel Welded Joint mechanical property
Table 3 U.S. ASTM A335-P91 modified form chrome molybdenum heat resisting steel Steel Welded Joint mechanical property
The intercrystalline corrosion of table 4 U.S. ASTM A335--P11 modified form chrome molybdenum heat resisting steel Steel Welded Joint
| ? | Embodiment 1 | Embodiment 2 | Remarks |
| The intercrystalline corrosion situation | Weld seam, heat affected area zero defect | Weld seam, heat affected area zero defect | ? |
The intercrystalline corrosion of table 5 U.S. ASTM A335--P91 modified form chrome molybdenum heat resisting steel Steel Welded Joint
| ? | Embodiment 5 | Embodiment 6 | Remarks |
| The intercrystalline corrosion situation | Weld seam, heat affected area zero defect | Weld seam, heat affected area zero defect | ? |
Patented technology of the present invention in 800,000 tons of/year cracking of ethylene furnace apparatus of 1,000,000 tons of/year cracking of ethylene furnace apparatus in Dushanzi, Xinjiang and Fushun, has obtained practical application in the modified form chrome molybdenum heat resisting steel process pipelines welding job according to U.S. ASTE/ASME standard.In carrying out Welding Testing, Non-Destructive Testing (RT, UT, PT, MT), the detection of destructive physics and chemistry, the result of actual detected is good.With SH/T 3520-2004 " petrochemical industry modified form chrome molybdenum heat resisting steel welding code " steel pipe in the welding of applying argon gas protection compare, solder yield reaches 97.1% level.Energy savings and construction period that can be a large amount of in the construction, good social benefit and economic benefit have been obtained.
Claims (4)
1. modified form chrome molybdenum heat resisting pipe back side unprotect solid core welding wire backing weld method, it is characterized in that cooperating the polynary hybrid protection gas of rich helium, carry out the bottoming welding of modified form chrome molybdenum heat resisting steel class pipeline according to SH/T3520-2004 standard and conventional welding parameter with chrome-molybdenum steel solid welding wire ER80S-G or ER90S-B9;
The polynary hybrid protection gas of wherein rich helium comprises that volumn concentration is that 82～92% He, volumn concentration are 6～12% Ar, and volumn concentration is 2～6% CO
2
2. modified form chrome molybdenum heat resisting pipe according to claim 1 back side unprotect solid core welding wire backing weld method is characterized in that described ER80S-G or ER90S-B9 chrome-molybdenum steel solid welding wire are according to U.S. AWS A5.28-" 2005 and ASME SFA5.28-05 chrome molybdenum heat resisting steel welding standard select for use.
3. modified form chrome molybdenum heat resisting pipe according to claim 1 back side unprotect solid core welding wire backing weld method is characterized in that described modified form chrome molybdenum heat resisting steel class pipeline is ASTM A335-P11 and ASTM A335-P91 modified form chrome molybdenum heat resisting steel pipeline.
4. according to claim 1 or 3 described modified form chrome molybdenum heat resisting pipe back side unprotect solid core welding wire backing weld methods, it is characterized in that described modified form chrome molybdenum heat resisting steel pipeline group is 1～1.5mm to back U type groove gap.
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| CN102489842A (en) * | 2011-12-07 | 2012-06-13 | 鞍山锅炉厂有限公司 | Argon tungsten-arc welding process for pearlite heat-resistant steel pipe and austenitic heat-resistant steel pipe |
| CN110091030A (en) * | 2019-05-24 | 2019-08-06 | 江苏格兰环境科技有限公司 | The welding procedure of heating furnace pipeline steel alloy |
| CN113857631A (en) * | 2021-10-14 | 2021-12-31 | 中国原子能科学研究院 | Welding process method for dissimilar steel |
| CN115091004A (en) * | 2022-07-15 | 2022-09-23 | 蓬莱巨涛海洋工程重工有限公司 | Method for welding cracking furnace material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110091030A (en) * | 2019-05-24 | 2019-08-06 | 江苏格兰环境科技有限公司 | The welding procedure of heating furnace pipeline steel alloy |
| CN113857631A (en) * | 2021-10-14 | 2021-12-31 | 中国原子能科学研究院 | Welding process method for dissimilar steel |
| CN115091004A (en) * | 2022-07-15 | 2022-09-23 | 蓬莱巨涛海洋工程重工有限公司 | Method for welding cracking furnace material |
| CN115091004B (en) * | 2022-07-15 | 2024-05-28 | 蓬莱巨涛海洋工程重工有限公司 | Welding method of cracking furnace material |
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Application publication date: 20110706 |