CN103008852B - A kind of submerged welding process - Google Patents
A kind of submerged welding process Download PDFInfo
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- CN103008852B CN103008852B CN201210582104.9A CN201210582104A CN103008852B CN 103008852 B CN103008852 B CN 103008852B CN 201210582104 A CN201210582104 A CN 201210582104A CN 103008852 B CN103008852 B CN 103008852B
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Abstract
The invention discloses a kind of technique that the thick plate no more than 14mm of two boards is carried out submerged-arc welding, after position to be welded forms groove, check that the fit-up gap of the two makes it meet requirement, and at joint back side fixed-bearing, then submerged arc control lever dolly moves with uniform velocity along weld seam, welding wire on dolly is while moving with uniform velocity with dolly, control welding wire and do backward at the uniform velocity reciprocally swinging relative to dolly along bead direction, and control the amplitude of wire oscillation, make the swinging arc of welding wire be in all the time within the scope of molten bath; And adjusting welding wire height, it is ensured that when welding wire is put before being positioned at swinging arc, electric arc can directly act on groove root. The welding current reduction that the present invention is not only required, heat input decreases, the swelling stress of weld seam reduces, weld seam terminal is not likely to produce crackle, and groove sidewall both sides are persistently heated by arc energy, improve deposition rate, improve production efficiency, the consumption of electricity and wlding simultaneously reduces, and reduces production cost.
Description
Technical field
The present invention relates to the butt welding process that thickness of slab is not more than the plate of 14mm.
Background technology
In shipbuilding process, to thickness of slab when the plate of below 14mm carries out butt welding, general shipyard mainly adopts following two method: one, adopt semi-automatic CO2 protection weldering, the method divides four roads to weld, four roads are used that semi-automatic CO2 protection weldering or front twice semi-automatic CO2 protection weldering, rear twice submerged-arc welding, advantage is that weld seam terminal seldom cracks, shortcoming is that welding sequence is complicated, production efficiency is low, and because electric arc can not heat on groove sidewall both sides all the time, arc energy is not enough, causes that deposition rate is low, they are two years old, adopt FCB high-efficiency welding method (i.e. the double, two molten bath submerged-arc welding of double, two arcs), without arc light in the method welding process, few flue dust, production efficiency is high, but it must use dual power supply, and electric current is relatively larger, the increase of electric current and the insulation effect of solder flux cause that heat input increases (heat input=electric current * voltage/speed of welding), and then make the swelling stress of weld seam increase, ultimately result in weld seam terminal and be easily generated crackle, and for the plate of thickness of slab 14mm, because the length of electric arc is generally 3mm, cannot once arrive the entire depth (14mm) of weld seam, adopt four layers of weldering in this way, four layers of butt welded seam are divided to carry out welding to reach welding effect, additionally power consumption the raising that also result in production cost is significantly increased, shipyard is disadvantageous by this.
Summary of the invention
It is desirable to provide a kind of submerged welding process, reaching to improve production efficiency, improve deposition rate, reduce cost and weld seam terminal is not likely to produce the purpose of crackle.
A kind of submerged welding process of the present invention, comprises the step of following sequence:
A, left and right two plate positions to be welded are processed, form groove;
B, by left and right two plates docking, check the fit-up gap of left and right two plates, make the fit-up gap of left and right two plates meet required precision;
C, liner is set at the left and right two plate joint back sides, and liner is fixed;
D, use Lincoln weld dolly weld, in welding process, this dolly moves with uniform velocity along weld seam, welding wire on dolly is while moving with uniform velocity with dolly, control welding wire and do backward at the uniform velocity reciprocally swinging relative to dolly along bead direction, and control the amplitude of wire oscillation, make the swinging arc of welding wire be in all the time within the scope of molten bath; And adjusting welding wire height, it is ensured that when welding wire is put before being positioned at swinging arc, electric arc can directly act on groove root.
Submerged welding process of the present invention, is not more than the plate of 14mm for thickness of slab. In welding process, when welding wire is positioned at the lowest point of swinging arc, namely during First Point, arc energy directly acts on groove root, makes groove root melt, and forms bottom welding seam with the solder of fusing; Along with welding wire swings along bead direction backward, now welding wire does retarded motion relative to plate, gradually in camber line lifting bottom welding wire, electric arc and molten bath also gradually step up along swinging arc, make the metal molten of groove upper section, forming new weld seam with the solder of fusing, being filled on bottom welding seam, thus increasing weld seam packed height. Welding wire is in the process swung backward, the relative plate retarded motion of welding wire, in molten bath, molten metal and solder have the possibility tumbled forward, but the electric arc swung backward has very strong digging force, under the effect of strong digging force, it is it can be avoided that molten metal and solder forward side tumble; Thus also avoid to contact groove root because molten metal tumbles forward the very first time with solder and form first weld seam because the weld seam that formed of this situation can because formation temperature is too low poor quality, it is easy to crack. It addition, when welding wire swings forward, do accelerated motion relative to plate, fusing metal and solder can stay the rear side in molten bath due to effect of inertia, and welding wire can arrive point before molten bath prior to fusing metal, can guarantee that arc energy directly acts on groove root, make groove root melt, form bottom welding seam. This welding manner is not only greatly improved the electric arc mining ability to molten bath, the welding of whole weld seam can be completed by weldering together, simplify welding sequence, improve production efficiency, and welding arc to molten bath forward and backward 2 in turn effect make in butt-welding process electric arc persistently groove sidewall both sides be heated, solving the problem that in semi-automatic CO2 protection weldering, arc energy is not enough, deposition rate is higher; Relative to FCB high-efficiency welding method, welding current required for this technique is about its half, when other conditions are constant, heat input also reduces therewith to half, and then the swelling stress of weld seam declines to a great extent, weld seam terminal is not likely to produce crackle, and the electric current needed for this technique is smaller and use single supply simultaneously, the electric energy consumed reduces, and production cost reduces.
The gap distance from bottom of left and right plate is 2-4mm, and when plate gap distance from bottom is less than 2mm, welding wire becomes difficulty along weld seam swing, and welding wire and electric arc do not arrive the application point preset, it is impossible to the forward and backward point in molten bath is carried out useful effect; When plate gap distance from bottom is more than 4mm, it is easy to when causing welding, molten bath is unstable, ultimately results in negative shape bad, the use of wlding simultaneously increases the rising also resulting in production cost.
Detailed description of the invention
Embodiment one
Two plate positions to be welded are processed, form the groove of 15 °; Two plate docking, check that the fit-up gap of two plates, gap distance from bottom are 2mm; Refer to liner at the joint back side, and liner is fixed; Lincoln weld dolly is used to weld, in welding process, this dolly moves with uniform velocity along weld seam, welding wire on dolly is while moving with uniform velocity with dolly, control welding wire and do backward at the uniform velocity reciprocally swinging relative to dolly along bead direction, and control the amplitude of wire oscillation, make the swinging arc of welding wire be in all the time within the scope of molten bath; And adjusting welding wire height, it is ensured that when welding wire is put before being positioned at swinging arc, electric arc can directly act on groove root, and the hunting frequency of welding wire is set to 100 beats/min.
The common bevel angle of FCB high-efficiency welding method is 50 °, plate gap distance from bottom is 6mm, the present embodiment bevel angle is 15 °, plate gap distance from bottom is 2mm, by contrast, needing the weld seam volume filled to reduce, required wlding reduces accordingly, reduce further production cost; When bevel angle is less than 15 °, plate gap distance from bottom is less than 2mm, and welding wire becomes difficulty along weld seam swing, and welding wire and electric arc do not arrive the application point preset, it is impossible to molten bath forward and backward some effect, affect welding quality.
The relation of wire oscillation frequency f and the swing linear velocity V of welding wire is V=2 Π R*f, R is the pendulum radius of welding wire, R is definite value: during welding wire swing, if the frequency swung is excessively slow, then the swing linear velocity of welding wire reduces, and in the unit interval, the number of times of the forward and backward point in arcing molten bath reduces, and the received heat of forward and backward some unit interval of molten bath reduces, needing the time lengthening of welding, production efficiency reduces; If the frequency swung is too fast, then the swing linear velocity of welding wire increases, although in the unit interval, the heating times of the forward and backward point in molten bath increases, but frequency is too fast causes that electric arc is unstable, effective heating times can reduce on the contrary, and the heating of the forward and backward point in molten bath can not get ensureing equally, affects welding quality. Showing through test of many times, the frequency configuration of swing is 100 beats/min, both can guarantee that the stability of electric arc, can obtain again higher production efficiency.
Embodiment two
The angle of groove is set to 30 °, and the distance bottom plate gap is 4mm; Other are identical with embodiment one.
Still less compared to FCB high-efficiency welding method, the present embodiment bevel angle and plate gap distance from bottom, it is necessary to the weld seam volume of filling reduces, and required wlding reduces accordingly, reduces production cost; When bevel angle is more than 30 °, when plate gap distance from bottom is more than 4mm, it is easy to when causing welding, molten bath is unstable, ultimately results in negative shape bad, the use of wlding simultaneously increases the rising also resulting in production cost.
Except above example, under the stability premise meeting electric arc, it is possible to adjust the hunting frequency of welding wire by arranging the cycle of agitator on dolly, it is more short that cycle oscillator is arranged, the hunting frequency of welding wire is more fast, and the linear velocity of wire oscillation is more big, contributes to the raising of welding efficiency; Otherwise, when electric arc instability, what arranged by cycle oscillator is longer, then the hunting frequency of welding wire is slack-off, and the linear velocity of wire oscillation is also slack-off, makes electric arc return to stable state. The stability of electric arc can be characterized by the domain of walker of weldingvoltage, and in welding process, weldingvoltage is when the difference of maxima and minima is floated within the scope of 1V, and electric arc is stable, and the numerical value of weldingvoltage can be read by the voltmeter of dolly.
Claims (5)
1. a submerged welding process, comprises the step of following sequence:
A, need welding position to be processed left and right two plates, form groove;
B, by left and right two plates docking, check the fit-up gap of left and right two plates, make the fit-up gap of left and right two plates meet required precision;
C, liner is set at the left and right two plate joint back sides, and liner is fixed;
D, use Lincoln weld dolly weld, in welding process, this dolly moves with uniform velocity along weld seam, welding wire on dolly is while moving with uniform velocity with dolly, control welding wire and do backward at the uniform velocity reciprocally swinging relative to dolly along bead direction, and control the amplitude of wire oscillation, make the swinging arc of welding wire be in all the time within the scope of molten bath; And adjusting welding wire height, it is ensured that when welding wire is put before being positioned at swinging arc, electric arc can directly act on groove root.
2. a kind of submerged welding process according to claim 1, it is characterised in that: the angle of step A groove is 15-30 °.
3. a kind of submerged welding process according to claim 1, it is characterised in that: the gap distance from bottom of the left and right plate of step B is 2-4mm.
4. a kind of submerged welding process according to claim 1, it is characterised in that: the hunting frequency of step D welding wire is 100 beats/min.
5. a kind of submerged welding process according to claim 1, it is characterised in that: the hunting frequency of step D welding wire is arranged by the agitator on Lincoln weld dolly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210582104.9A CN103008852B (en) | 2012-12-28 | 2012-12-28 | A kind of submerged welding process |
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| CN201210582104.9A CN103008852B (en) | 2012-12-28 | 2012-12-28 | A kind of submerged welding process |
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| CN103008852A CN103008852A (en) | 2013-04-03 |
| CN103008852B true CN103008852B (en) | 2016-06-15 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103706917B (en) * | 2013-12-25 | 2015-10-28 | 青岛武船重工有限公司 | A kind of FCB that prevents welds the terminal heating means producing terminal crackle |
| CN103817416A (en) * | 2014-01-27 | 2014-05-28 | 天津新港船舶重工有限责任公司 | One-step molding submerged arc welding method for steel sheet docking |
| JP6996993B2 (en) * | 2018-01-31 | 2022-01-17 | 株式会社神戸製鋼所 | Single-sided submerged arc welding method and single-sided submerged arc welding equipment |
| CN113070472B (en) * | 2019-12-17 | 2023-05-12 | 赵晴堂 | Deposition milling integrated double-station 3D printer |
| CN113305404B (en) * | 2021-05-31 | 2022-10-25 | 二十二冶集团装备制造有限公司 | Single-wire submerged arc welding process for 30-50mm thick steel plate |
| CN115091002B (en) * | 2022-08-19 | 2022-10-28 | 石家庄中润设备科技有限公司 | Welding process for effectively melting truncated edges of weld bead groove and pipeline welding robot |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101422836A (en) * | 2007-09-11 | 2009-05-06 | 大宇造船海洋株式会社 | Welding method of butt-welded joints |
| CN101767245A (en) * | 2009-12-30 | 2010-07-07 | 广州中船龙穴造船有限公司 | Horizontal position welding method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100045071A (en) * | 2008-10-23 | 2010-05-03 | 대우조선해양 주식회사 | Both-sided welding method of butt welding joint with v groove configuration |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101422836A (en) * | 2007-09-11 | 2009-05-06 | 大宇造船海洋株式会社 | Welding method of butt-welded joints |
| CN101767245A (en) * | 2009-12-30 | 2010-07-07 | 广州中船龙穴造船有限公司 | Horizontal position welding method |
Non-Patent Citations (2)
| Title |
|---|
| 弧偏吹对埋弧焊接质量的影响和焊接工艺改进措施;胡柏上;《焊接技术》;20040831;第33卷(第4期);第53-55页 * |
| 碎丝埋弧焊工艺在钢桥制造中的应用研究;张华等;《电焊机》;20091031;第39卷(第10期);第28-32页 * |
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Address after: 510382 Guangzhou, Guangdong Province, south of Fangcun Avenue, No. 40 Patentee after: CSSC OFFSHORE & MARINE ENGINEERING (Group) Co.,Ltd. Address before: 510382 Guangzhou, Guangdong Province, south of Fangcun Avenue, No. 40 Patentee before: GUANGZHOU SHIPYARD INTERNATIONAL Co.,Ltd. |
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Effective date of registration: 20160701 Address after: 511462 Nansha District, Guangzhou, Pearl River Management District, West Road, No., the first floor of the layer on the ground floor, No. 68 Patentee after: Guangzhou Shipyard International Co.,Ltd. Address before: 510382 Guangzhou, Guangdong Province, south of Fangcun Avenue, No. 40 Patentee before: CSSC OFFSHORE & MARINE ENGINEERING (Group) Co.,Ltd. |