CN102500879A - Welding method for reducing deflection of condenser shell - Google Patents
Welding method for reducing deflection of condenser shell Download PDFInfo
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- CN102500879A CN102500879A CN2011103196405A CN201110319640A CN102500879A CN 102500879 A CN102500879 A CN 102500879A CN 2011103196405 A CN2011103196405 A CN 2011103196405A CN 201110319640 A CN201110319640 A CN 201110319640A CN 102500879 A CN102500879 A CN 102500879A
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- welding
- weld seam
- tube sheet
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Abstract
The invention discloses a welding method for reducing deflection of a condenser shell. The method comprises the following steps of: (a) welding a tube plate; (b) welding a tube plate and end plate combined welding line; and (c) welding an end plate, wherein in the step (a), three welding lines on two sides are adopted. In the method, dual-side welding is performed stepwise sequentially, so that the angular deformations of a front side and a back side can be counteracted; large-area stiffness reinforcement is avoided, so that deformation rebound is effectively controlled, and welding accuracy is increased; the spliced welding line of the end plate is welded after the tube plate and end plate combined welding line is welded, so that the deformation caused by thinness of the end plate can be reduced; and moreover, symmetric welding, backstep welding and CO2 gas protection welding are performed and welding parameters are controlled, so that welding deformation of the shell can be reduced greatly, and welding efficiency is increased.
Description
Technical field
The present invention relates to a kind of welding method, particularly a kind of method that is used for thermal power plant's condenser shell welding.
Background technology
Condenser is a kind of turbine discharge to be condensed into the heat exchanger of water, claims steam condenser again.Condenser is mainly used in the steam turbine power plant, is divided into two kinds of water-cooled condenser and air cooling tubes condensers.Condenser is condensed into the water boiler of feeding reuses except that the steam discharge with steam turbine, can also set up vacuum at the turbine discharge place and keep vacuum.The condenser average physique that is used for thermal power plant is bigger, is mostly the field Welding installation, and its housing must be controlled deflection when welding is made, otherwise can cause harmful effect to installment work.
Condenser shell field Welding distortion has in the past brought a lot of inconvenience to installment work greatly; In the prior art; The welding of condenser shell generally is to adopt argon arc welding technique; Adopt large-area rigidity to reinforce and the method for control distortion is general, but this method causes welding stress not discharged fully, have the restive shortcoming of distortion bounce-back.
To above-mentioned deficiency, need to explore a kind of welding procedure of condenser shell, optimize processing step and parameter, avoid the large tracts of land rigidity to reinforce, to solve the unmanageable problem of distortion bounce-back, improve welding precision.
Summary of the invention
In view of this, the present invention provides a kind of welding method that reduces the condenser shell deflection, and this method has avoided the large tracts of land rigidity to reinforce through optimizing welding step and parameter, reaches control distortion bounce-back, improves the purpose of welding precision.
The welding method that reduces the condenser shell deflection of the present invention may further comprise the steps: a) tube sheet welding; B) tube sheet and end plate composite welds welding; C) end plate welding; In the said step a), adopt two sides three road weld seams, promptly by following order welding:
1) at the tube sheet face bonding first road weld seam;
2) at the second road weld seam of tube sheet reverse side weldering with the first road weld seam symmetry;
3) weldering the 3rd road weld seam above the positive first road weld seam of tube sheet;
4) weldering the 4th road weld seam above the tube sheet reverse side second road weld seam;
5) weldering the 5th road weld seam above positive the 3rd road weld seam of tube sheet;
6) weldering the 6th road weld seam above tube sheet reverse side the 4th road weld seam.
Further, in the said step a), to two ends while symmetrical welding, the welding current and the speed of welding of two ends symmetrical welding are consistent from the weld seam middle part;
Further, in the said step a), the per pass weld seam at first adopts the backstep sequence discontinuous welding, and fusion length is 400mm, and spacing is 400mm, full weld then;
Further, said step a), b) and c) in, adopt little electric current rapid welding, welding current is 155A, speed of welding is 180mm/min;
Further, said step a), b) and c) in, the mode of operation that adopts the straight line arc manipulation or slightly swing welding rod;
Further, said step a), b) and c) in, adopt CO
2Gas shielded arc welding.
Beneficial effect of the present invention: the welding method that reduces the condenser shell deflection of the present invention comprises step: a) tube sheet welding, b) tube sheet and welding of end plate composite welds and c) the end plate welding; In the said step a), adopt two sides three road weld seams, the present invention carries out two-sided welding step by step, in order; Double-edged angular deformation is cancelled out each other; Avoid the use of the large tracts of land rigidity and reinforce, effectively controlled the distortion bounce-back, and improved welding precision; The splicing welding joint of end plate welds after tube sheet and end plate composite welds have welded again, also can reduce owing to the thin distortion that causes of end plate; In addition, the present invention is through symmetrical welding, backstep, CO
2Gas shielded arc welding and control welding parameter can reduce the welding deformation of housing greatly, and improve welding efficiency.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
Fig. 1 is the welding sketch map of tube sheet of the present invention two sides three road weld seams.
The specific embodiment
Below will combine accompanying drawing that the present invention is elaborated, as shown in the figure: the welding method that reduces the condenser shell deflection of present embodiment may further comprise the steps: a) tube sheet welding; B) tube sheet and end plate composite welds welding; C) end plate welding; Because end plate is thinner, and weld seam is long, is easy to generate moderate finite deformation, press the said sequence welding, can reduce the distortion after end plate welds, in the said step a), adopt two sides three road weld seams, promptly weld by following order:
1) at the tube sheet face bonding first road weld seam 1;
2) at the second road weld seam 2 of tube sheet reverse side weldering with the first road weld seam, 1 symmetry;
3) the 3rd road weld seam 3 of weldering and the second road weld seam, 2 symmetries above the positive first road weld seam 1 of tube sheet;
4) the 4th road weld seam 4 of weldering and the 3rd road weld seam 3 symmetries above the tube sheet reverse side second road weld seam 2;
5) the 5th road weld seam 5 of weldering and the 4th road weld seam 4 symmetries above positive the 3rd road weld seam 3 of tube sheet;
6) the 6th road weld seam 6 of weldering and the 5th road weld seam 5 symmetries above tube sheet reverse side the 4th road weld seam 4;
Through the positive and negative symmetrical welding, double-edged angular deformation is cancelled out each other, avoid the use of the large tracts of land rigidity and reinforce, can effectively control the distortion bounce-back, and improve welding precision.
Further improvement as technique scheme; In the said step a), to two ends while symmetrical welding, the welding current and the speed of welding of two ends symmetrical welding are consistent from the weld seam middle part; The stress that two ends produce in the time of can making welding is equally cancelled out each other, and reduces deflection.
As the further improvement of technique scheme, in the said step a), the per pass weld seam at first adopts the backstep sequence discontinuous welding; Fusion length is 400mm, and spacing is 400mm, full weld then; At first adopt backstep sequence and fusion length and spacing to get optimum value; Can effectively reduce the heat affected area, reduce welding stress, thereby reduce distortion.
As the further improvement of technique scheme, said step a), b) and c) in, adopt little electric current rapid welding; Welding current is 155A; Speed of welding is 180mm/min, the mode of operation that adopts the straight line arc manipulation or slightly swing welding rod, control weld heat input; Use little standard welding, can effectively reduce angular deformation.
As the further improvement of technique scheme, said step a), b) and c) in, adopt CO
2Gas shielded arc welding can reduce welding deformation on the one hand greatly, also can improve welding efficiency on the other hand.
The present invention is when practical application; The angular deformation of housing assembling wall scroll weld seam (by 8 meters) can be by bringing up to below the 3mm below the 5mm in the past; The base plate welding line angular distortion can be welded same weld seam by bringing up to below the 3mm below the 6mm in the past, and the workman can shorten about 1/3 working time.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. a welding method that reduces the condenser shell deflection is characterized in that: may further comprise the steps: a) tube sheet welding; B) tube sheet and end plate composite welds welding; C) end plate welding; In the said step a), adopt two sides three road weld seams, promptly by following order welding:
1) at the tube sheet face bonding first road weld seam (1);
2) at the second road weld seam (2) of tube sheet reverse side weldering with the first road weld seam (1) symmetry;
3) at the positive first road weld seam (1) of tube sheet top weldering the 3rd road weld seam (3);
4) at the tube sheet reverse side second road weld seam (2) top weldering the 4th road weld seam (4);
5) at positive the 3rd road weld seam (3) of tube sheet top weldering the 5th road weld seam (5);
6) at tube sheet reverse side the 4th road weld seam (4) top weldering the 6th road weld seam (6).
2. the welding method that reduces the condenser shell deflection according to claim 1 is characterized in that: in the said step a), to two ends while symmetrical welding, the welding current and the speed of welding of two ends symmetrical welding are consistent from the weld seam middle part.
3. the welding method that reduces the condenser shell deflection according to claim 2 is characterized in that: in the said step a), the per pass weld seam at first adopts the backstep sequence discontinuous welding, and fusion length is 400mm, and spacing is 400mm, full weld then.
4. the welding method that reduces the condenser shell deflection according to claim 3 is characterized in that: said step a), b) and c) in, adopt little electric current rapid welding, welding current is 155A, speed of welding is 180mm/min.
5. the welding method that reduces the condenser shell deflection according to claim 3 is characterized in that: said step a), b) and c) in, the mode of operation that adopts the straight line arc manipulation or slightly swing welding rod.
6. the welding method that reduces the condenser shell deflection according to claim 3 is characterized in that: said step a), b) and c) in, adopt CO
2Gas shielded arc welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103196405A CN102500879A (en) | 2011-10-20 | 2011-10-20 | Welding method for reducing deflection of condenser shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103196405A CN102500879A (en) | 2011-10-20 | 2011-10-20 | Welding method for reducing deflection of condenser shell |
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| Publication Number | Publication Date |
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| CN102500879A true CN102500879A (en) | 2012-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011103196405A Pending CN102500879A (en) | 2011-10-20 | 2011-10-20 | Welding method for reducing deflection of condenser shell |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2860072B2 (en) * | 1995-10-06 | 1999-02-24 | 株式会社神戸製鋼所 | Automatic TIG welding method |
| CN1565788A (en) * | 2003-06-09 | 2005-01-19 | 上海市安装工程有限公司 | Bridge steel structure welding procedure in working field |
| CN1603045A (en) * | 2004-11-08 | 2005-04-06 | 渤海船舶重工有限责任公司 | Double sides double arc welding method |
| CN101293303A (en) * | 2008-06-13 | 2008-10-29 | 中国船舶重工集团公司第七二五研究所 | TIG automatic welding technique for titanium alloy thick plate narrow interstice |
| CN101607342A (en) * | 2009-06-26 | 2009-12-23 | 广州中船黄埔造船有限公司 | A kind of submerged arc welding method of plank boards and jointing boards |
-
2011
- 2011-10-20 CN CN2011103196405A patent/CN102500879A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2860072B2 (en) * | 1995-10-06 | 1999-02-24 | 株式会社神戸製鋼所 | Automatic TIG welding method |
| CN1565788A (en) * | 2003-06-09 | 2005-01-19 | 上海市安装工程有限公司 | Bridge steel structure welding procedure in working field |
| CN1603045A (en) * | 2004-11-08 | 2005-04-06 | 渤海船舶重工有限责任公司 | Double sides double arc welding method |
| CN101293303A (en) * | 2008-06-13 | 2008-10-29 | 中国船舶重工集团公司第七二五研究所 | TIG automatic welding technique for titanium alloy thick plate narrow interstice |
| CN101607342A (en) * | 2009-06-26 | 2009-12-23 | 广州中船黄埔造船有限公司 | A kind of submerged arc welding method of plank boards and jointing boards |
Non-Patent Citations (3)
| Title |
|---|
| 代国文: "Q345型中厚钢板拼接中优化焊缝的工艺措施", 《电焊机》, vol. 37, no. 6, 30 June 2007 (2007-06-30), pages 130 - 132 * |
| 崔北休: "600MW超临界机组凝汽器焊接", 《第四届安徽科技论坛安徽省电机工程学会分论坛论文集》, 31 December 2006 (2006-12-31), pages 38 - 41 * |
| 杜武斌: "凝汽器组合钢板现场焊接变形控制", 《第九届全国电站焊接学术讨论会论文集》, 31 December 2004 (2004-12-31), pages 158 - 161 * |
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Application publication date: 20120620 |