CN102941403B - Welding process of narrow-gap submerged arc welding for shell flange - Google Patents

Welding process of narrow-gap submerged arc welding for shell flange Download PDF

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Publication number
CN102941403B
CN102941403B CN201210536901.3A CN201210536901A CN102941403B CN 102941403 B CN102941403 B CN 102941403B CN 201210536901 A CN201210536901 A CN 201210536901A CN 102941403 B CN102941403 B CN 102941403B
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welding
arc
narrow
shell
submerged
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CN201210536901.3A
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Chinese (zh)
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CN102941403A (en
Inventor
刘大为
宋丹
李梦启
李雅范
张韵曾
杜雷
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哈尔滨电气动力装备有限公司
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Abstract

The invention relates to a welding process of narrow-gap submerged arc welding for a shell flange, comprising the following steps of: machining a narrow-gap groove according to the type of the groove; assembling the shell flange into an integer; placing the shell flange on an anti-axial-play rolling wheel frame and levelling; and performing narrow-gap submerged arc welding according to reasonable process specifications. The welding process disclosed by the invention is a huge breakthrough of the shell flanges of canned motors and the like in welding method and process, realizes mechanized submerged arc welding, saves 1/2 of the weight of molten metal, shortens production cycle by 70%, greatly improves welding quality, and reduces welding repair rate.

Description

The blue narrow-clearance submerged arc welding welding procedure of shell process

Technical field: the present invention relates to the blue narrow-clearance submerged arc welding welding procedure of a kind of shell process.

Background technology: twentieth century six the seventies, nuclear energy power generation technology obtains tremendous development, late nineteen nineties nuclear energy circle nuclear power developing was divided into for four generations: the sixties in 20th century five build prototype nuclear power plant be called first generation nuclear power (Gen I); The large scale business nuclear power plant built from the seventies runs to now always, belongs to the second generation (Gen II); The third generation (Gen III) is the exploitation nineties, at safety and the design of nuclear power plant having quite several improvement economically, improves also in continuation, enter AP600/AP1000, formed Gen III+, be called as that class of improvement type exactly; Generation Ⅳ (Gen IV) proposes for Long-term planning, and the nuclear power system of new generation being expected to the year two thousand thirty or more early introducing to the market, not only refers to that nuclear power plant itself also comprises fuel recycle.AP1000 is designed by US Westinghouse company's overall development on the basis of AP600, and the PWR nuclear power plant of secondary circuit million kilowatt, has non-passive safety characteristic, is first third generation+nuclear power design obtaining U.S.'s core pipe and can finally ratify.

The main pump of AP1000 technology and reactor coolant pump are as the critical piece of primary Ioops, and its general structure and the type of cooling are all brand-new.As shown in Figure 2, the blue main pressure border shell as main pump of shell process, the effect that mainly carry an overfill protection and prevent cooling agent from revealing.

Shield electric machine shell in the past all adopts manual electric arc welding or gas metal-arc welding, and welding labour intensity is large, efficiency is low and quality not easily ensures, repair rate is very high.Submerged-arc welding, as a kind of welding method of efficient, high-quality, has obtained extensive welding procedure in the industrial production.Especially for the butting grooves of large thick-wall cylinder structure, attractive in appearance, high-quality weld seam can all be obtained by adopting submerged-arc welding method.And narrow-clearance submerged arc welding is due to bevel angle narrower (being generally 1.5 ° ~ 4 °), under same hot initial conditions, its heat affected area is very narrow, therefore can obtain the higher welding point of impact flexibility.But be because groove is narrow equally, how welding bead is arranged, how to allocate the parameters such as electric current, voltage and speed of welding and avoid occurring sidewall incomplete fusion defect, having become the difficult point in narrow-clearance submerged arc welding termination process and challenge.

The service life that the design specification book of AP1000 main pump is promised to undertake is 60 years, and shell process is blue as leakage-preventing protecting sheathing, no matter mother metal or weld seam all will bear high pressure during one's term of military service at very long.Therefore the examination requirements for its welding point is quite strict, once find the shortcoming in darker region through radiographic inspection, will likely cause scrapping of whole parts.Therefore in the urgent need in the narrow-clearance submerged arc welding termination process of shell process orchid, a whole set of accurate, stable and rational process system method is adopted to carry out instructing and Mass Control.

Summary of the invention:

The object of the invention is to set up one efficient, stable and use the blue narrow-clearance submerged arc welding welding procedure of shell process flexibly, the narrow-clearance submerged arc welding that can realize large thick-walled cylinder type shell process orchid connects.Technical scheme of the present invention is:

The blue narrow-clearance submerged arc welding welding procedure of a kind of shell process: 1) set up narrow gap submerged arc work station, adopt the reliable submerged arc welding electric power of steady quality, walking mechanism and auxiliary facility to be the prerequisite ensureing that welding is stable, ensure that the blue aequum on Anti-moving turning rolls of shell process is ± 0.20mm;

Adopt the submerged arc welding electric power with fall volt-ampere characteristic, to obtain Current adjustment (△ I) and self-regulation sensitivity more efficiently, to ensure the stability of wire feed;

2) bevel angle reasonable in design and pattern, be designed by seam location, the cartridge type joint close groove of one-sided bevel angle 4 ° by the shell process orchid of wall thickness 140mm;

3) qualification of welding procedure is carried out, select rational matching welding material, and the Mechanical property tests such as Welded Joints carries out stretching, bending and impact, the reliability of checking weld seam and usability, tested by the matching of welding wire and solder flux, rational submerged-arc welding is selected to combine wlding, for the carbon steel section of shell process orchid, because mother metal adopts the materials A SME SA516 Gr.70 of ASME Code, therefore select the Lincoln 880M solder flux that the EH11K welding wire of the wlding Φ 2.4mm of AWS and Lincoln company of the U.S. produce; And for the weld seam of stainless steel section, select the ER309 welding wire of the stainless steel welding stick Φ 1.6mm produced according to AWS and be specifically designed to the solder flux Soudakay IND24 of stainless steel welded Su Deke company;

4) electric current, voltage and the speed of welding parameter of mating is sought, because heat input is important change element in this case, therefore according to following formula:

Heat input=electric current (I) × voltage (U) × 60/ speed of welding seeks to stablize by arc burning in the hot input range that qualification of welding procedure allows, the shaping good parameter matching of welding bead;

Concrete welding parameter is carbon steel part: electric current 380 ~ 400A voltage 33 ~ 34V

Speed of welding 420mm/min

Stainless steel parts: electric current 280 ~ 300A voltage 32 ~ 33V

Speed of welding 350mm/min

5) welding bead of Narrow sloping-glot arranged, press the distance of road amount and welding wire distance sidewall to be strict with, as welding bead arrange or pressure road amount unreasonable, easily to crack, the defect such as pore; And as improper apart from the size Control of sidewall in welding wire, then easily produce the defect of incomplete fusion;

Therefore for Narrow sloping-glot submerged-arc welding, ground floor should in the middle of joint welding one deposited metal, later every layer of twice, welding wire and groove wall spacing keep 3.2-4.0mm, at the top of joint, according to can be more than every layer of deposition twice apart from situation;

6) to striking current, electrode extension, circular weld overlap joint, the refinement of solder flux heap high-tech link.

Striking current is set to 90A, ensure the normal starting the arc and good welding bead end formed;

Electrode extension 27 ~ 29mm, guarantees that arc burning is stablized, and is not easily stained with silk;

Electrode angle 8 ~ 10 °, so that blow force of arc makes welding bead beautiful appearance, scalelike mark is more even;

Annular weld bead amount of lap is 30mm, to the refuse of starting the arc part weakness zone, ensures welding quality;

Current polarity adopts DC reverse connection (DCEP), obtains larger fusion penetration and stable molten bath;

7) to the control of temperature, because submerged-arc welding belongs to the larger welding method of heat input, to strictly control for preheat temperature and interlayer temperature, for carbon steel part, minimum 66 DEG C of preheat temperature, maximum 230 DEG C of interlayer temperature, for stainless steel parts, minimum 15 DEG C of preheat temperature, maximum 176 DEG C of interlayer temperature, by control temperature, avoid due to heat input excessive and produce fire check.

The present invention is by setting up efficient, stable and using narrow-clearance submerged arc welding flexibly to connect process system, the blue narrow-clearance submerged arc welding of shell process completing the reactor coolant pump of AP1000 nuclear power technology at home first connects, the disposable radiographic inspection inspection (RT) that have passed weld seam, achieve the motorization welding of shell process orchid, substantially increase production efficiency and welding quality.

Article one, the deposite metal amount of the blue narrow-clearance submerged arc welding seam of shell process is about 1024kg, as adopted traditional welding method, deposited metal weight is about 1500kg, welding material weight savings about 1/2.The welding interval adopting narrow-clearance submerged arc welding method to carry out shell process orchid is 3 days; 15 days are then about as adopted manual electric arc welding; And adopt gas metal-arc welding to be about 10 days, can find out by adopting process program of the present invention to substantially reduce the manufacturing cycle.

The present invention adopts novel motor-driven soldering method, and back does not need back chipping to get final product complete penetration; And submerged-arc welding is the operation of non-open arc, substantially improves the work situation of operator, reduces potential safety hazard.The present invention be similar shield electric machine casing flange at welding method and technologic quantum jump, achieve motorization submerged arc welding, save deposite metal weight 1/2, shorten the production cycle 70%, increase substantially welding quality and reduce welding repair rate.

The present invention further increases narrow-clearance submerged arc welding welding procedure level in welding specialty field, having groped to use the various parameter matching of submerged arc welding structural alloy steel and austenitic stainless steel perfect, is the development of later submerged arc welding technique and cumulative innovation abundant data and referential experience.

Accompanying drawing illustrates:

Fig. 1 is the outer special type figure of submerged arc welding electric power

Fig. 2 is shell process orchid and Narrow sloping-glot form structure figure

Fig. 3 reasonably arranges apart from sidewall distance and welding bead

Detailed description of the invention:

The blue narrow-clearance submerged arc welding welding procedure of a kind of shell process: 1) set up narrow gap submerged arc work station, adopts the reliable submerged arc welding electric power of steady quality, walking mechanism and auxiliary facility to be the prerequisites ensureing that welding is stable.Ensure that the blue aequum on Anti-moving turning rolls of shell process is ± 0.20mm;

As shown in Figure 1, the submerged arc welding electric power with fall volt-ampere characteristic is adopted, to obtain △ I and self-regulation sensitivity more efficiently, to ensure the stability of wire feed;

2) bevel angle reasonable in design and pattern, be designed by seam location, the cartridge type joint close groove of one-sided bevel angle 4 ° by the shell process orchid of wall thickness 140mm;

3) qualification of welding procedure is carried out, select rational matching welding material, and the Mechanical property tests such as Welded Joints carries out stretching, bending and impact, the reliability of checking weld seam and usability, tested by the matching of welding wire and solder flux, rational submerged-arc welding is selected to combine wlding, for the carbon steel section of shell process orchid, because mother metal adopts the materials A SME SA516 Gr.70 of ASME Code, therefore select the Lincoln 880M solder flux that the EH11K welding wire of the wlding Φ 2.4mm of AWS and Lincoln company of the U.S. produce; And for the weld seam of stainless steel section, select the ER309 welding wire of the stainless steel welding stick Φ 1.6mm produced according to AWS and be specifically designed to the solder flux Soudakay IND24 of stainless steel welded Su Deke company;

4) electric current, voltage and the speed of welding parameter of mating is sought, because heat input is important change element in this case, therefore according to following formula:

Heat input=electric current (I) × voltage (U) × 60/ speed of welding, seeks to stablize by arc burning, the shaping good parameter matching of welding bead in the hot input range that qualification of welding procedure allows;

Concrete welding parameter is carbon steel part: electric current 380 ~ 400A voltage 33 ~ 34V

Speed of welding 420mm/min

Stainless steel parts: electric current 280 ~ 300A voltage 32 ~ 33V

Speed of welding 350mm/min

5) as shown in Figure 3, the welding bead of Narrow sloping-glot is arranged, presses the distance of road amount and welding wire distance sidewall to be strict with, as welding bead arrange or pressure road amount unreasonable, easily to crack, the defect such as pore; And as improper apart from the size Control of sidewall in welding wire, then easily produce the defect of incomplete fusion;

Therefore for Narrow sloping-glot submerged-arc welding, ground floor should weld one deposited metal, later every layer of twice in the middle of joint, and welding wire and groove wall spacing keep 3.2-4.0mm.At the top of joint, can be more than every layer of deposition twice according to distance situation.

6) to striking current, electrode extension, circular weld overlap joint, the refinement of solder flux heap high-tech link.

Striking current is set to 90A, ensure the normal starting the arc and good welding bead end formed;

Electrode extension 27 ~ 29mm, guarantees that arc burning is stablized, and is not easily stained with silk;

Electrode angle 8 ~ 10 °, so that the blowing force of electric arc makes welding bead beautiful appearance, scalelike mark is more even;

Annular weld bead amount of lap is 30mm, to the refuse of starting the arc part weakness zone, ensures welding quality;

Current polarity adopts DC reverse connection (DCEP), obtains larger fusion penetration and stable molten bath.

7) to the control of temperature, because submerged-arc welding belongs to the larger welding method of heat input, to strictly control for preheat temperature and interlayer temperature;

For carbon steel part, minimum 66 DEG C of preheat temperature, maximum 230 DEG C of interlayer temperature

For stainless steel parts, minimum 15 DEG C of preheat temperature, maximum 176 DEG C of interlayer temperature

By control temperature, avoid due to heat input excessive and produce fire check.

Claims (1)

1. the blue narrow-clearance submerged arc welding welding procedure of shell process, is characterized in that:
1) set up narrow gap submerged arc work station, adopt the reliable submerged arc welding electric power of steady quality, walking mechanism and auxiliary facility to be the prerequisite ensureing that welding is stable, ensure that the blue aequum on Anti-moving turning rolls of shell process is ± 0.20mm;
Adopt the submerged arc welding electric power with fall volt-ampere characteristic, to obtain Current adjustment (△ I) and self-regulation sensitivity more efficiently, to ensure the stability of wire feed;
2) design bevel angle and pattern, the shell process orchid of wall thickness 140mm is designed by seam location, the cartridge type joint close groove of one-sided bevel angle 4 °;
3) qualification of welding procedure is carried out, select matching welding material, and Welded Joints carries out stretching, bending and impulse machine mechanical property test, the reliability of checking weld seam and usability, tested by the matching of welding wire and solder flux, select submerged-arc welding combination wlding, for the carbon steel section of shell process orchid, because mother metal adopts the materials A SMESA516Gr.70 of ASME Code, therefore select the Lincoln 880M solder flux that the EH11K welding wire of the wlding Φ 2.4mm of AWS and Lincoln company of the U.S. produce; And for the weld seam of stainless steel section, the solder flux SoudakayIND24 that the ER309 welding wire selecting the stainless steel welding stick Φ 1.6mm produced according to AWS and the Su Deke company being specifically designed to stainless steel welded use produce;
4) electric current, voltage and the speed of welding parameter of mating is sought, because heat input is important change element in this case, therefore according to following formula:
Heat input=electric current (I) × voltage (U) × 60/ speed of welding, seeks to stablize by arc burning, the shaping good parameter matching of welding bead in the hot input range that qualification of welding procedure allows;
Concrete welding parameter is carbon steel part: electric current 380 ~ 400A, voltage 33 ~ 34V, speed of welding 420mm/min,
Stainless steel parts: electric current 280 ~ 300A, voltage 32 ~ 33V, speed of welding 350mm/min,
5) welding bead of Narrow sloping-glot arranged, press the distance of road amount and welding wire distance sidewall to be strict with, as welding bead arrange or pressure road amount unreasonable, easily to crack, gas hole defect; And as improper apart from the size Control of sidewall in welding wire, then easily produce the defect of incomplete fusion;
Therefore for Narrow sloping-glot submerged-arc welding, ground floor should weld one deposited metal, later every layer of twice in the middle of joint, and welding wire and groove wall spacing keep 3.2-4.0mm, at the top of joint, more than distance situation every layer deposition twice;
6) to striking current, electrode extension, circular weld overlap joint, the refinement of solder flux heap high-tech link:
Striking current is set to 90A, ensure the normal starting the arc and good welding bead end formed;
Electrode extension 27 ~ 29mm, guarantees that arc burning is stablized, and is not easily stained with silk;
Electrode angle 8 ~ 10 °, so that blow force of arc makes welding bead beautiful appearance, scalelike mark is more even;
Annular weld bead amount of lap is 30mm, to the refuse of starting the arc part weakness zone, ensures welding quality;
Current polarity adopts DC reverse connection (DCEP), obtains larger fusion penetration and stable molten bath;
7) to the control of temperature, because submerged-arc welding belongs to the larger welding method of heat input, to strictly control for preheat temperature and interlayer temperature, for carbon steel part, minimum 66 DEG C of preheat temperature, maximum 230 DEG C of interlayer temperature, for stainless steel parts, minimum 15 DEG C of preheat temperature, maximum 176 DEG C of interlayer temperature, by control temperature, avoid due to heat input excessive and produce fire check.
CN201210536901.3A 2012-12-13 2012-12-13 Welding process of narrow-gap submerged arc welding for shell flange CN102941403B (en)

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CN103433697B (en) * 2013-08-09 2016-09-07 中国石油天然气第六建设公司 A kind of marine engineering equipment heavy wall beam column welding procedure
CN103769720A (en) * 2013-12-28 2014-05-07 柳州市江航工贸有限公司 Welding structure for circular seam welding
CN104816070A (en) * 2015-05-15 2015-08-05 中国海洋石油总公司 Austenitic stainless steel pipeline welding process
CN109048002A (en) * 2018-07-20 2018-12-21 沈阳鼓风机集团核电泵业有限公司 A kind of buried arc welding method of austenitic steel slab girth joint narrow gap
CN110064813A (en) * 2019-05-29 2019-07-30 湖北三江航天江北机械工程有限公司 The welding method of airborne pencil rocket shell
CN110328496A (en) * 2019-08-01 2019-10-15 郑州煤矿机械集团股份有限公司 Improve the manufacturing method of Barrel of Hydraulic Cylinders service life

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US4213025A (en) * 1976-07-02 1980-07-15 Bbc Brown, Boveri & Company, Limited Apparatus for connecting metallic parts by means of arc fusion welding
CN85104150A (en) * 1985-06-04 1987-01-14 机械工业部哈尔滨焊接研究所 Double strings narrow chink slugging arc welding process

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213025A (en) * 1976-07-02 1980-07-15 Bbc Brown, Boveri & Company, Limited Apparatus for connecting metallic parts by means of arc fusion welding
CN85104150A (en) * 1985-06-04 1987-01-14 机械工业部哈尔滨焊接研究所 Double strings narrow chink slugging arc welding process

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