CN103600148B - A kind of semi-automatic diffusion welding method of steam turbine generator soft connection board - Google Patents

A kind of semi-automatic diffusion welding method of steam turbine generator soft connection board Download PDF

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Publication number
CN103600148B
CN103600148B CN201310521679.4A CN201310521679A CN103600148B CN 103600148 B CN103600148 B CN 103600148B CN 201310521679 A CN201310521679 A CN 201310521679A CN 103600148 B CN103600148 B CN 103600148B
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copper strips
copper
welding
flange
connection board
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CN103600148A (en
Inventor
全玉强
李波
周振福
沈兵
蔺福民
夏鲜良
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Shanghai Electric Power Generation Equipment Co Ltd
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Shanghai Electric Power Generation Equipment Co Ltd
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00Soldering, e.g. brazing, or unsoldering
    • B23K1/0008Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0018Brazing of turbine parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/002Resistance welding; Severing by resistance heating specially adapted for particular articles or work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00Resistance welding; Severing by resistance heating
    • B23K11/34Preliminary treatment

Abstract

The invention provides a kind of semi-automatic diffusion welding method of steam turbine generator soft connection board, soft connection board is that stacking copper strips, copper coin and flange welding form, in order to improve the fit-up gap of stacking copper strips and copper coin and flange, stacking copper strips two ends all need diffusion welding (DW) integral, after stacking copper strips one end is first welded into one, weld with copper coin through polishing fit clearance, stacking copper strips not yet bending during this step sequence, two stacking copper ribbon continuous after bending carry out integral solder with copper coin and flange again.Method provided by the invention overcomes the deficiencies in the prior art, can control the fluctuation of steam turbine generator soft connection board welding well, significantly improve welding quality and welding efficiency, standby good technology stability.

Description

A kind of semi-automatic diffusion welding method of steam turbine generator soft connection board
Technical field
The present invention relates to a kind of semi-automatic diffusion welding method of steam turbine generator leading-out terminal soft connection board, belong to steam turbine generator technical field.
Background technology
Turbine generator owner outlet more employing soft connection board is connected with main lead-in wire and leading-out terminal, and soft connection board carries output generator electric current and alleviates support vibration to functions such as the impacts of leading-out terminal.Its main structure body is that tens of large scale copper strips bendings become S curved, and each and copper connecting plate in two ends and copper flange welding, main lead-in wire and leading-out terminal adopt respectively to weld and be connected with soft connection board with bolted mode.
Existing soft connection board manufacture is use Simple clamp and two ends copper coin to fix the copper strips after bending, then adopts flame brazing method to realize welding, because workpiece volume causes more greatly required heat input large, needs two welders to use two welding guns to heat simultaneously.Existing gas brazing process limitations is in the feature of method itself, and the more operating technology being limited to welder, causes process repeatability not high.Also there is heating uneven, local heating too seriously produces the consequence of coarse grains simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is to provide one can improve soft connection board workmanship, possesses the semi-automatic diffusion welding method of the steam turbine generator soft connection board of good technology stability simultaneously.
In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide a kind of semi-automatic diffusion welding method of steam turbine generator soft connection board, it is characterized in that: the method is made up of following 7 steps:
Step 1: single copper strips is except ensureing that content sum that the chemical analysis of material meets Cu and Ag should be not less than 99.95%, and the flatness of its plane should be no more than 0.15mm; Copper strip surface should not exist and is mingled with or scratches defect;
Step 2: one end of a copper strips is welded: copper strips is piled poststack and load electrode welder part, not preseting solder sheet between copper strips, only copper strips is heated to 950 DEG C ~ 970 DEG C by electrode pressure and heating-up temperature, insulation, makes the atom of copper strips contact surface quality inspection mutually diffuse to form connection;
Step 3: another root copper strips is also welded its one end according to the method in step 2;
Step 4: two copper strips having welded one end are carried out being machined to the gap of the board slot mating surface of all solders side and copper coin within 0.13mm, preset 0.13mm_BCu80AgP solder sheet, ensure that two copper strips and copper coin contact surface possess pressure all the time by frock, complete welding of one end that two copper strips have welded and copper coin by the welding parameter preset;
Step 5: two copper strips are carried out hydraulic pressure bending according to the deflection of crossing preset simultaneously;
Step 6: two copper strips other ends are sandwiched electrode simultaneously and welds, postwelding processes all solders side with flange board slot of two copper strips, guarantees that the gap in copper strips solder side and flanged plate slot fit face is within 0.13mm;
Step 7: two copper strips other ends are welded with flange, flange wouldn't Machining Arc limit, the outer rim using it straight positions and conducts electricity, by electrode pressure head, preset 0.13mm_BCu80AgP solder sheet between copper strips and flange board slot, ensures that the gap in welding process between copper strips and flange board slot is less than 0.13mm all the time.
Preferably, in described step 2, temperature retention time is 240 seconds.
Preferably, in described step 5, during hydraulic pressure bending, utilize the copper coin be connected with copper strips to position, guarantee that two copper strips bendings are consistent, unlikelyly occur shape difference.
Preferably, in described step 4, when copper strips welds with copper coin, electrode should be preheated to 650 DEG C; In described step 7, when copper strips and flange welding, electrode also should be preheated to 650 DEG C.
Preferably, in described step 2 and step 6, during copper strips welding, cooling protection should be imposed at its rear portion, weld zone apart from 20mm place.
The semi-automatic diffusion welding method of steam turbine generator soft connection board provided by the invention is in the unconverted situation of technique, by welding machine and tooling device but not personnel carry out welding operation, the stability that further guarantee technique repeats, reduces or eliminates because welding the quality fluctuation caused.
Method provided by the invention overcomes the deficiencies in the prior art, can control the fluctuation of steam turbine generator soft connection board welding well, significantly improve welding quality and welding efficiency, standby good technology stability.
Accompanying drawing explanation
Fig. 1 is soft connection board and main lead-in wire and Flange joint schematic diagram;
Fig. 2 is soft connection board schematic diagram.
Detailed description of the invention
For making the present invention become apparent, hereby with several preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Technical scheme of the present invention is the welding that the diffusion welding (DW) equipment of use semi-automation completes all welding step sequences that are flexible coupling, and often step is welded and walked sequence all based on great number tested data statistics, sets out the parameters such as optimum bonding power, pressure and duration.Human activity only limits to and walks sequence with the preweld cleaning, postwelding polishing etc. of copper strips and copper coin.In welding process, by temperature thermocouple monitor procedure temperature, and form PID (proportional-integral-differential) with equipment and circulate, to adjust equipment power output, accurately ensure that workpiece completes welding according to the temperature curve of setting.By above technological measure, can ensure that workpiece is heated evenly, welding quality fluctuation is little, and greatly enhances productivity.
Figure 1 shows that the connection diagram of soft connection board and main lead-in wire and leading-out terminal, main lead-in wire 1 is connected by soft connection board 2 with leading-out terminal 3, and soft connection board is formed by stacking copper strips has certain flexible large conductive section.Main lead-in wire 1 is connected by brazing mode with soft connection board 2, and leading-out terminal 3 and soft connection board 2 are fastened by bolts.
As shown in Figure 2, soft connection board 2 is welded for stacking copper strips 5, copper coin 4 and flange 6.In order to improve the fit-up gap of stacking copper strips 5 and copper coin 4 and flange 6, stacking copper strips two ends all need diffusion welding (DW) integral.After stacking copper strips 5 one end is first welded into one, weld with copper coin 4 again through polishing fit clearance, stacking copper strips 5 not yet bending during this step sequence.Two after bending stacking copper strips 5 carry out integral solder together with copper coin 4 and flange 6.
Embodiment 1
For ensureing this soft connection board welding quality, the semi-automatic diffusion welding method concrete steps of 1000MW thermoelectricity steam turbine generator soft connection board provided by the invention are as follows:
Step 1: the content sum of chemical analysis Cu and the Ag of single copper strips material is 99.95%, the flatness of its plane is 0.15mm.Copper strip surface does not exist and is obviously mingled with or the blemish such as scuffing.
Step 2: copper strips one end is first welded, copper strips heap poststack loads electrode welder part, and not preseting solder sheet between copper strips, is only heated to 950 DEG C by electrode pressure and heating-up temperature by copper strips, keeps 240s.The atom between copper strips contact surface is made mutually to diffuse to form connection.Cooling protection should be imposed at its rear portion, weld zone apart from 20mm place during copper strips welding.
Step 3: another straight copper strips is welded its one end according to method in step 2.
Step 4: all solders side of two copper strips and copper coin that are soldered one end are processed, preset 0.13mm_BCu80AgP solder sheet between one end that two copper strips are soldered and the board slot mating surface of copper coin, ensure that contact surface possesses the pressure being not less than 2.5MPa all the time by frock, complete welding of one end that two copper strips are soldered and copper coin by the welding parameter 820 DEG C/5min/2.5MPa preset; Electrode should be preheated to 650 DEG C.
Step 5: two copper strips are carried out hydraulic pressure bending according to the deflection 3mm of crossing preset simultaneously, the copper coin be connected with copper strips can be utilized during bending to position, guarantees that two copper strips bendings unanimously, unlikelyly occurs shape difference.
Step 6: the other end not yet welded by two copper strips sandwiches electrode simultaneously and welds, should impose cooling protection at its rear portion, weld zone apart from 20mm place during copper strips welding.Postwelding processes its solder side that is all and flange board slot.
Step 7: two copper strips other ends are welded with flange, flanged plate wouldn't Machining Arc limit, the outer rim using it straight positions and conducts electricity, the electrical contact area of abundant guarantee welding process, by electrode pressure head, preset 0.13mm_BCu80AgP solder sheet between copper strips and flange board slot, ensures that in welding process, copper strips and flange board slot gap are less than 0.13mm all the time.Electrode should be preheated to 650 DEG C.
Welded gap uniformity between rear copper strips and copper coin groove and flange board slot, on average can reach the pricker conjunction rate of more than 85%, conductive capability reaches designing requirement completely.
Embodiment 2
For ensureing this soft connection board welding quality, the semi-automatic diffusion welding method concrete steps of 390MW thermoelectricity steam turbine generator soft connection board provided by the invention are as follows:
Step 1: the content sum of chemical analysis Cu and the Ag of single copper strips material is 99.97%, the flatness of its plane is 0.14mm.Copper strip surface does not exist and is obviously mingled with or the blemish such as scuffing.
Step 2: copper strips one end is first welded, copper strips heap poststack loads electrode welder part, and not preseting solder sheet between copper strips, is only heated to 970 DEG C by electrode pressure and heating-up temperature by copper strips, keeps 240s.The atom of copper strips contact surface quality inspection is made mutually to diffuse to form connection.Cooling protection should be imposed at its rear portion, weld zone apart from 20mm place during copper strips welding.
Step 3: another straight copper strips is welded its one end according to method in step 2.
Step 4: all solders side of two copper strips and copper coin that are soldered one end are processed, preset 0.13mm_BCu80AgP solder sheet between one end that two copper strips are soldered and the board slot mating surface of copper coin, ensure that contact surface possesses the pressure being not less than 2MPa all the time by frock, complete welding of one end that two copper strips are soldered and copper coin by the welding parameter 825 DEG C/5min/2MPa preset; Electrode should be preheated to 600 DEG C.
Step 5: two copper strips are carried out hydraulic pressure bending according to the deflection 4.5mm of crossing preset simultaneously, the connecting plate be connected with copper strips can be utilized during bending to position, guarantees that two copper strips bendings unanimously, unlikelyly occurs shape difference.
Step 6: the one end of not yet being welded by two copper strips sandwiches electrode simultaneously and welds, should impose cooling protection at its rear portion, weld zone apart from 20mm place during copper strips welding.Postwelding processes its solder side that is all and flange board slot.
Step 7: two copper strips other ends are welded with flange, flanged plate wouldn't Machining Arc limit, the outer rim using it straight positions and conducts electricity, the electrical contact area of abundant guarantee welding process, by electrode pressure head, preset 0.13mm_BCu80AgP solder sheet between copper strips and flange board slot, ensures that in welding process, copper strips and flange board slot gap are less than 0.13mm all the time.Electrode should be preheated to 650 DEG C.
Welded gap uniformity between rear copper strips and copper coin groove and flange board slot, on average can reach the pricker conjunction rate of more than 87%, conductive capability reaches designing requirement completely.
To sum up, the semi-automatic diffusion welding method of steam turbine generator soft connection board provided by the invention, copper strips raw material need control surface quality and surface smoothness; Straight copper strips welds with copper coin after should first having welded one end; Carry out overall bending again after all straight copper strips have welded with copper coin, ensure bending size; Other end welding is carried out again after the overall bending of copper strips; The copper strips other end and flange integral solder the most at last; Copper strips self welding adopts diffusion welding method, and temperature controls at 950 DEG C ~ 970 DEG C, and time controling is at about 240s; The copper strips of postwelding and copper coin and flange adopt resistance brazing, and solder adopts money base or copper base solder, when carrying out bulk copper coin and flange welds with copper strips, carbon electrode need be preheated to 600 DEG C ~ 650 DEG C and can obtain best welding effect.
The realization of the present invention by welding the semi-automation of soft connection board welding manner, improve the Forming Quality of soft connection board, avoid the issuable quality fluctuation of manual welding, simultaneously by the adjustment to process sequence, also improve the stress concentration phenomenon after copper strips welding.The present invention covers the key element of the type syndeton substantially, through the on-site verification at 1000MW and 390MW grade steam turbine generator soft connection board, the fluctuation of welding procedure can be controlled well, significantly improve Forming Quality and production efficiency, also reduce production cost simultaneously, obtain significant economic benefit.
The present invention has high-quality and efficient, the advantage such as convenient operation, course quantization concurrently, can promote the use of in the similar syndeton of different size, be particularly useful for large scale to be flexible coupling, welding fabrication is superior in quality, is the reliable manufacture method of the large-scale flexible connection structure of large turbo-type generator.

Claims (5)

1. a semi-automatic diffusion welding method for steam turbine generator soft connection board, is characterized in that: the method is made up of following 7 steps:
Step 1: single copper strips (5) is except ensureing that content sum that the chemical analysis of material meets Cu and Ag should be not less than 99.95%, and the flatness of its plane should be no more than 0.15mm; Copper strips (5) surface should not exist and is mingled with or scratches defect;
Step 2: one end of a copper strips (5) is welded: copper strips is piled poststack and load electrode welder part, not preseting solder sheet between copper strips, only copper strips is heated to 950 DEG C ~ 970 DEG C by electrode pressure and heating-up temperature, insulation, makes the atom between copper strips contact surface mutually diffuse to form connection;
Step 3: another root copper strips (5) is also welded its one end according to the method in step 2;
Step 4: two copper strips (5) of having welded one end are carried out the gap of the board slot mating surface being machined to all solders side and copper coin (4) within 0.13mm, preset 0.13mmBCu80AgP solder sheet, ensure that two copper strips (5) and copper coin (4) contact surface possess pressure all the time by frock, complete welding of one end that two copper strips (5) have welded and copper coin (4) by the welding parameter preset;
Step 5: two copper strips (5) are carried out hydraulic pressure bending according to the deflection of crossing preset simultaneously;
Step 6: two copper strips (5) other ends are sandwiched electrode simultaneously and welds, postwelding processes all solders side with flange (6) board slot of two copper strips (5), guarantees that the gap of copper strips (5) solder side and flange (6) board slot mating surface is within 0.13mm;
Step 7: two copper strips (5) other ends are welded with flange (6), flange (6) wouldn't Machining Arc limit, the outer rim using it straight positions and conducts electricity, by electrode pressure head, preset 0.13mmBCu80AgP solder sheet between copper strips (5) and flange (6) board slot, ensures that the gap in welding process between copper strips and flange board slot is less than 0.13mm all the time.
2. the semi-automatic diffusion welding method of a kind of steam turbine generator soft connection board as claimed in claim 1, is characterized in that: in described step 2, and temperature retention time is 240 seconds.
3. the semi-automatic diffusion welding method of a kind of steam turbine generator soft connection board as claimed in claim 1, it is characterized in that: in described step 5, during hydraulic pressure bending, the copper coin (4) be connected with copper strips (5) is utilized to position, guarantee that two copper strips (5) bendings are consistent, unlikelyly occur shape difference.
4. the semi-automatic diffusion welding method of a kind of steam turbine generator soft connection board as claimed in claim 1, is characterized in that: in described step 4, and when copper strips (5) welds with copper coin (4), electrode should be preheated to 650 DEG C; In described step 7, when copper strips (5) welds with flange (6), electrode also should be preheated to 650 DEG C.
5. the semi-automatic diffusion welding method of a kind of steam turbine generator soft connection board as claimed in claim 1, is characterized in that: in described step 2 and step 6, should impose cooling protection during copper strips welding at its rear portion, weld zone apart from 20mm place.
CN201310521679.4A 2013-10-29 2013-10-29 A kind of semi-automatic diffusion welding method of steam turbine generator soft connection board Active CN103600148B (en)

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CN103817451B (en) * 2014-03-13 2016-04-13 中国科学院电子学研究所 Oxygen-free copper complex welding method

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JPS58103979A (en) * 1981-12-16 1983-06-21 Matsushita Electric Ind Co Ltd Conducting method for electricity to flexible conductor laminated with thin sheets
JP3634011B2 (en) * 1995-06-27 2005-03-30 三菱電機株式会社 Manufacturing method of conductive part with flexible conductor and manufacturing apparatus of flexible conductor
JP4875718B2 (en) * 2009-01-21 2012-02-15 株式会社井上製作所 Flexible conductor and method for producing flexible conductor
JP2013131434A (en) * 2011-12-22 2013-07-04 Tyco Electronics Japan Kk Flexible conductor and flexible conductor manufacturing method
CN102945711B (en) * 2012-12-07 2015-05-13 安费诺-泰姆斯(常州)通讯设备有限公司 Manufacturing method for flexible soft copper bar assembly for electric connection

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