Shield electric machine stator can and lower flange welding method and the equipment using thereofTechnical field: the present invention relates to a kind of screen shield electric machine stator can and lower flange weldingMethod and the equipment using thereof.
Background technology: shield electric machine is the key equipment in nuclear island of nuclear power station, and its integrality is to oneThe safe operation important in loop, and it is non-active to be directly connected to third generation AP1000The success or failure of nuclear power station technology transfer, wherein to lower flange, welding is shield electric machine master to stator canPump is manufactured a critical process in link; It is by a circuit cools that stator can object is setAgent medium and stator winding are kept apart completely, and stator can is to protect to the girth joint of lower flangeCard sealing, prevents the key that cooling agent is revealed. And traditional GTAW method heat is defeatedEnter waywardly, easily cause mother metal over hot melting to be even out of shape, and weldquality is subject to human factorImpact is serious, and quality is unstable, and repair rate is high, therefore uses traditional handicraft cannot meet thisThe designing requirement of product housing. For ensureing motor performance, improve housing product quality, needAdopt new welding procedure.
Summary of the invention: the object of this invention is to provide a kind of shield electric machine stator can to laxative remedyBlue welding technique, realizes uniform ring seam welding, avoids postwelding to occur that deflection is excessive, gasThe defect such as exceed standard that hole, crackle, incomplete fusion and surface be discontinuous.
Technical scheme of the present invention is: a kind of shield electric machine stator can and lower flange welding sideMethod:
(1) adopt motor-driven silk filling tungsten argon arc soldering method welding shield electric machine stator can withLower flange joint, argon tungsten-arc welding is using argon gas as protective gas, utilizes tungsten electrode and mother metalThe arc heat fusing mother metal producing between metal and the welding process of filler wire, the filling of welding wireTo send to certain speed in a side of welding direction by mechanical transmission mode;
(2), according to joint specific constructive form and size, designing and manufacture can be at fixing ringThe head (1) of walking on shape guide rail, the upper integrated mechanical wire feeder (2) of head (1) andPossesses the tungsten argon arc welding gun (3) of arc length control function; Design and manufacture and coordinate this head to useFrock;
(3) according to joint concrete structure size, adjust welding parameter, select coupling electric current,Voltage, wire feed rate and speed of welding, adjust head and wire-feeding pipe and send angle to reach bestContinuous filling condition, obtain optimal weldquality;
(4) the shield electric machine stator can of thin wall cylinder-shaped structure adopts U.S. material and examinationTest the ASTM of association standard B575 material, length 3676mm, external diameter 591.236mm, wall thickness0.381mm, lower flange adopts the ASME of American Society of Mechanical Engineers (AMSE) standard SA336GradeF304 material, and housing coordinate internal diameter be 591.82mm, select and mother metal composition performance phaseThe near AWS of American Welding Society (AWS) standard A 5.14/A5.14M Ni-Cr-Mo welding wire ERNiCrMo-4,In conjunction with the requirement of welding machine wire feed, select the packing material of plate-like form, gage of wire is 0.020 ",Be loaded on supporting wire feeding disc, when welding point, provide power by mechanical wire feeder, realizeWire feed continuously;
(5) welding method: a) cleaning housing and lower flange surface, keeps lower flange end faceAt horizontal level, by housing, through lower flange fixing, holding workpiece is in downhand position; B)Install and purify air bag in stator can inner chamber, continue the auxiliary protection argon gas that provides sufficient, reallyProtect and in whole welding process, in housing, form protective gas cavity, propping up of having cleared up is installedSupport frock and air ring, ensure that lower flange (8) end face is concordant with housing (9) top edge,Air ring (10) position is apart from housing top edge about 0.035 " after, regulate stretching air ring,Ensure that air ring and housing paste tight, the gap of eliminating air ring and housing as far as possible; C) willHead (1) to supporting tool, guarantees that tungsten electrode, welding wire are with respect to housing together with guide rails assemblingAngle, position meet the requirements, and adjust electric current, voltage, wire feed rate and the weldering of coupling before weldingConnect speed; D) adopt motor-driven silk filling tungsten argon arc soldering method welding, workpiece is fixed, welding machine machineHead is along guide rail uniform circular motion, and welder is Real-Time Monitoring welding pool in welding process, and rightFinely tune welding parameter and wire feed position, keeps wire feed position to be positioned at welding pool center, protectsIn card welding process, molten bath is stable, welding line joint cool to room temperature in air after welding; E)Postwelding butt welded seam quality checks, utilizes five times of magnifying glass butt welded seam joint outer surfaces to examineLook into and liquid penetrant inspection, appearance of weld is good, and Non-Destructive Testing is qualified, has reached Expected Results.
Another object of the present invention is to provide one, and to guarantee that welding gun is parallel to housing all the time axial,Realize shield electric machine stator can and the lower flange welding institute of the welding of cylinder end circular weldWith equipment. This equipment and technology scheme is: a kind of shield electric machine stator can and lower flange welderingConnect equipment used, it is characterized in that: the upper integrated mechanical wire feeder (2) of welding head (1)With the tungsten argon arc welding gun (3) that possesses arc length control function; The work that coordinates head (1) to useDress comprises: ring-shaped guide rail (5), copper air ring (10), support (4), air bag (7) withAnd bracket (6); The integrated mechanical wire feeder of head (1) (2) and tungsten electrode argon arc welding gun (3),Support (4) top welding machine guide rail (5) be installed, support (4) bottom air ring (10) is installed,It is upper for fixed support (4) that bracket (6) is placed on lower flange (8), and air bag (7) is installedIn stator can (9); Before welding, will ensure on lower flange (8) end face and housing (9)Edge is concordant, and air ring (10) axial direction is a little less than weld seam.
The present invention is optimized conventional method with motor-driven silk filling tungsten argon arc soldering method: headFirst, realize weld seam automatic filling by mechanical wire feeder, and by the arc length control of welding gunFunction, can, according to actual welds moulding situation, carry out speed of welding and feed rate of welding wireCorresponding adjustment, final acquisition is shaped evenly attractive in appearance, and the weld seam of reliable in quality, has avoided traditional handThe manual silk filling of work argon tungsten-arc welding causes efficiency low, and due to inhomogeneous the causing of hand torch heatingThe problem such as the inhomogeneous weld defect causing of welding joint shaping; Secondly, be different from pipeline welderingThe welding gun vertical axial rotating welding mode that connects equipment, is used head provided by the present invention, canIn the time that it is walked along guide rail, guarantee that welding gun is parallel to housing all the time axial, realize cylinder endThe welding of circular weld; Finally, use air ring frock stretching housing and lower flange, ensureIts play movement is even, because copper material is than housing material softness, can not cause damage to itWound, the simultaneously good heat conductivility of copper, can effective cooling weld seam, excessive while avoiding weldingHeat input cause the fusing distortion of housing material, significantly improve appearance of weld, ensure weld seamQuality; This process has obtained checking on welding analog part, and weldquality is good, reachesExpection requirement.
Brief description of the drawings:
Fig. 1 is shield electric machine stator can and lower flange welding schematic diagram
Fig. 2 is shield electric machine stator can and lower flange welding air ring assembling schematic diagram
Detailed description of the invention:
A kind of shield electric machine stator can and lower flange welding method:
(1) adopt motor-driven silk filling tungsten argon arc soldering method welding shield electric machine stator can withLower flange joint, argon tungsten-arc welding is using argon gas as protective gas, utilizes tungsten electrode and mother metalThe arc heat fusing mother metal producing between metal and the welding process of filler wire, the filling of welding wireTo send to certain speed in a side of welding direction by mechanical transmission mode;
(2), according to joint specific constructive form and size, designing and manufacture can be at fixing ringThe head (1) of walking on shape guide rail, the upper integrated mechanical wire feeder (2) of head (1) andPossesses the tungsten argon arc welding gun (3) of arc length control function; Design and manufacture and coordinate this head to useFrock;
(3) according to joint concrete structure size, adjust welding parameter, select coupling electric current,Voltage, wire feed rate and speed of welding, adjust head and wire-feeding pipe and send angle to reach bestContinuous filling condition, obtain optimal weldquality;
(4) the shield electric machine stator can of thin wall cylinder-shaped structure adopts U.S. material and examinationTest the ASTM of association standard B575 material, length 3676mm, external diameter 591.236mm, wall thickness0.381mm, lower flange adopts the ASME of American Society of Mechanical Engineers (AMSE) standard SA336GradeF304 material, and housing coordinate internal diameter be 591.82mm, select and mother metal composition performance phaseThe near AWS of American Welding Society (AWS) standard A 5.14/A5.14M Ni-Cr-Mo welding wire ERNiCrMo-4,In conjunction with the requirement of welding machine wire feed, select the packing material of plate-like form, gage of wire is 0.020 ",Be loaded on supporting wire feeding disc, when welding point, provide power by mechanical wire feeder, realizeWire feed continuously;
(5) welding method: a) cleaning housing and lower flange surface, keeps lower flange end faceAt horizontal level, by housing, through lower flange fixing, holding workpiece is in downhand position; B)Install and purify air bag in stator can inner chamber, continue the auxiliary protection argon gas that provides sufficient, reallyProtect and in whole welding process, in housing, form protective gas cavity, propping up of having cleared up is installedSupport frock and air ring, ensure that lower flange (8) end face is concordant with housing (9) top edge,Air ring (10) position is apart from housing top edge about 0.035 " after, regulate stretching air ring,Ensure that air ring and housing paste tight, the gap of eliminating air ring and housing as far as possible; C) willHead (1) to supporting tool, guarantees that tungsten electrode, welding wire are with respect to housing together with guide rails assemblingAngle, position meet the requirements, and adjust electric current, voltage, wire feed rate and the weldering of coupling before weldingConnect speed; D) adopt motor-driven silk filling tungsten argon arc soldering method welding, workpiece is fixed, welding machine machineHead is along guide rail uniform circular motion, and welder is Real-Time Monitoring welding pool in welding process, and rightFinely tune welding parameter and wire feed position, keeps wire feed position to be positioned at welding pool center, protectsIn card welding process, molten bath is stable, welding line joint cool to room temperature in air after welding; E)Postwelding butt welded seam quality checks, utilizes five times of magnifying glass butt welded seam joint outer surfaces to examineLook into and liquid penetrant inspection, appearance of weld is good, and Non-Destructive Testing is qualified, has reached Expected Results.
As shown in Figure 1, a kind of shield electric machine stator can and used the establishing of lower flange weldingStandby, integrated mechanical wire feeder 2 and the tungsten electrode argon that possesses arc length control function on welding head 1Arc welding torch 3; Coordinate the frock that uses of head 1 to comprise: ring-shaped guide rail 5, copper air ring 10,Support 4, air bag 7 and bracket 6; The integrated mechanical wire feeder 2 of head 1 and tungsten argon arcWeldering welding gun 3, supports 4 tops welding machine guide rail 5 is installed, and support 4 bottoms air ring 10 is installed,Bracket 6 is placed on lower flange 8 for fixed support 4, and air bag 7 is installed on stator can9; As shown in Figure 2, before welding, will ensure that lower flange 8 end faces are concordant with housing 9 top edges,Air ring 10 axial directions are a little less than weld seam.