Патент USA US2132975код для вставки
Oct.,11, 1938. ' P. E. sHAvL-:R 2,132,975 WELDING METHOD AND APPARATUS Filed Feb. 2l, 1935 25 4 Sheets-Sheet l 27 29 66 > Oct. 11, 1938. P. E.. SHAVER 2,132,975 WELDING METHOD AND APPARATUS Filed Feb. 2l, 1935 HNEHHH _l LL! F/G .4. 4 Sheets-Sheet 2 v Oct. 11, 1938. P_ El SHAVER 2,132,975 WELDING METHOD AND APPARATUS w/r/vfss.- ` @WL-@í ' ' Per” Lî/çayef Patented Oct. 11, 1938 ` 2,132,975 ` p UNITED STATES PATENT OFFICE 2,132,973 ` WELDING METHOD AND APPARATUS Perry E. Shaver, Philadelphia, Pa., assigner to Sun Shipbuilding à Dry Dock Company, Chester, Pa., a. corporation «of Pennsylvania Application February 21, 1935, Serial No. 7,525 7 Claims. (Cl. 219-8) This invention relates to a welding-method ing' and expensive and the results far from sat and apparatus particularly designed for the weld ing of elongated articles as, for example, the isfactory. _ It is the object of the present invention to provide for holding parts to be welded and the electric welding of elongated tubes or the like in UI such fashion as to prevent substantial warping or bending during the welding operation, and permit, for example, the holding of fins 4to a tube and a number of lines of welding to be pro duced simultaneously. The operation, further 10 welding of ñns upon tubes. y 'I'his application is, in part, a continuation of my application Ser. No. 694,597, filed October , 21, 1933. Considerable diñ‘lculty has been heretofore ex perienced in welding viins or the like upon long 10 tubes such as are used, for example, for heat transfer purposes in stills, condensers or the like. Diiilculties have been encountered partic ularly Where there are a number of fins to be held in place and welded simultaneously, as, for example, when a tube three inches or four inches in diameter and twenty or more feet long is to have welded to its outside and running length wise of it six or eight fins by a continuous weld. Tubes of this type are of such considerable length '20 that they are flexible to an appreciable degree in themselves and, furthermore, are to be asso ciated with ñns which are not of great thickness more, can be made automatic and is of this na ture in the preferred embodiment of the inven tion, the tube or other elongated article being moved vertically past electrodes fed at a fixed point. The method and apparatus forming the 15 subject matter of this invention are further adapted to facilitate the handling of long pipes or the like, which has heretofore been diñlcult during welding operations. - While the invention is applicable particularly 20 to securing fins or strips of various shapes upon elongated tubes of circular or other cross-sec and which are, consequently, also‘flexible, usu- » tion, or elongated members of various shapes, ally more so than the tubes. the method and apparatus are also applicable to the closure of seams, particularly where there 25 The operation of 25 holding these fins in proper place against the', tubes and welding one iin at a time as, for ex are a number of lengthwise extending seams to ample, by hand welding, is so tedious, time consuming, and expensive as to prevent the use of this type of tube wherever possible, although ior certain types of apparatus a tube of such type would be highly desirable. be closed simultaneously. This, together with other useful features of theA apparatus, will be brought out more fully in the following descrip tion when read in conjunction with the accom 30 panying drawings, in which Furthermore, in the case of a tube of con Fig. 1 is a diagrammatic sectional view illus siderable length, the application of heat to one trating the association of parts designed for side, as occurs when only one or two welds are 35 made at one time, brings the tube locally to the 4automatically carrying out the'method; Fig. 2 is a plan `view showing a'plurality of 35 associated welding heads arranged to simultane ously produce eight welds in the attachment of high welding temperatures, causing such sub stantial warping as to materially interfere with eight uns; l proper contact between the two parts to be welded together and to render the tubes useless because of lack of straightness after the welding opera tion is completed. Heretofore the only method of welding ñns on a long tube has involved carefully clamping the fin against the tube and subsequently using a 45 hand welding apparatus to feed an electrode into " and along the line of Contact of the ñn with the tube. In general, it has been necessary _to attach the ñn tothe tube locally by means of welds of short extent. .In any such case, not only- does there occur the warping referred to above, but where the addition of a number of rinato each tube is necessary, the welding ap paratus must be run the complete length of the tube for the fixation of each one. The op erationl has accordingly been very time-consum- v Fig. 3 is a detail View showing pneumatically operated means for holding ñns and a tube in ' proper assembled relationship; ‘ Fig. 4 vis a section taken on the plane indi cated at 4_4 in Fig. 3 showing details of the holding means; ~ Figs. 5 and 6 are end views illustrating the 45 type of work which may be accomplished by the use of the apparatus;` Fig. 7 is an enlarged detail view showing the relationships of various parts adjacent the weld ing electrodes; _ 450 Fig. 8 is a sectional detail showing the mount ing of a tin-holding roller; and Fig. 9 is> a wiring diagram showing certain of the control elements of the apparatus. The particular apparatus shown hereinlis-55> E 2,li32,975 adapted to handle tubes having a length of twen ty feet or more with diameters of three to four inches to which are to be attached eight fins running- substantially the full length of the tubes. The apparatus for-handling such tubes is illus ‘trated because tubes of such lengths carrying welding operation. Two such roller shapes are indicated in Fig. 3, from which the type of en gagement which is secured will be apparent. Springs 28 react between the brackets IB and ñanges on the piston extensions 2d to normally urge the pistons outwardly to the interior of the such a number of fins present major dii‘ûculties tubes or cylinders I2. in handling not only due to their size alone but their flexibility and the difficulty of spacing, ln the present case, these holding means are illustrated as operated by~ fluid or air pressure. It will be obvious -that in place thereof mechan holding and welding such a plurality of fins si multaneously. The working ñoor or platform 2 supports a stand Il on which the welding elements and other mechanism are mounted. The stand or -plat form table ¿i is provided with an opening t ex tending inwardly to its center, which is pro vided with a circular opening as shown in Fig. 2. The floor 2 is also provided with a laterally ex tending opening in order that the tubes may be 20 presented to the apparatus from the side, the tubes being originally on a floor below the plat form 2. A socket member It is provided initially located adjacent the lower ñoor „t by which the various parts to be assembled and welded may 25 be at least initially supported, although prefer ablythey are also supported by this socket dur~ ing the welding operation. As illustrated in Fig. ` ical means may be provided to secure,- for ex ample, by the use of suitable springs or screw arrangements, the application of the desired pressure to the parts being welded. rI‘he rollers 26 may engage the ñns, or if the fins are not op positely placed, certain oi’ the rollers .may be made to engage the tube walls. A welding head 3@ supported by the platform ¿l is provided for the making of each weld. Each welding head may be ci substantially conven‘ 20 tional character, the electrical arrangementsof `which are hereafter broughtout more fully. ' So far as the mechanical features are concerned, it may be stated that the heads are provided with rollers for feeding welding wires 32 from supply 25 reels 33, the wires being fed through elongated guiding tubes 3d to the line where welding is to 7, member I0 carries'a socket II so shaped as to atake place, for example, where the fins contact receive the fins to be attached vto the tube and with the tube. AProvision is made yin the usual fashion for grounding the tube to provide a re 30 the- tube itself, the tube being additionally sup ported upon an upright post I3, which serves for turn circuit. ln the preferred embodiment of the invention its guidance. The particular socket used de pends upon the individual work which is being which is illustrated, two motors are provided, one done, sockets of special shapes being provided for each job. Instead of separate sockets, of course, adjustable lower holding means may be provided to takercare of Various types of Work. In the -present case, the tube A is designed to have se cured to it a plurality of ilns B of various shapes, 40 as indicated in Fig. 3. Located at suitable intervals between the sock-A et member I0 and the position of the welding electrodes are suitable holding means designed to maintain the parts to be welded together in for securing the slow rise of the work during the progress of the welding operation and the other 35 to secure a rapid movement of the work during lowering and initial adjustment. These two, rnotorsv are indicated at 36 and 96 respectively and are designed to drive, through individual clutches, a suitable reduction gearing indicated 40 at 35 and shaft 31 which, through bevel gearing 38, serves to rotate a vertically extending screw 40. The socket member l0 is provided with a threaded hub 44 engaged on the screw so that v45 proper assembled relationship. These are illus ‘ as the screw rotates the socket member is moved ' trated as comprising curved tubes i2 and I2' vertically, being restrained against rotation by carrying inwardly directed pistons I4. In the the slight engagement of an extension upon a present case two of these holding means are il- y vertically extending rod 46. lustrated' which are identical except for the fact Details of both of these holding means are il The screw 40 -has attached to its upper end a reversely threaded screw 42 which may be ad 50 justed relatively to it by a hand ratchet arrange ment indicated at 48. 'I'his ratcheting arrange ment not only serves to secure a relative ñne ad lustrated in Figs. 3 and 4. The tube I2 in each case is provided with a> justment of the two screws, but also to lock the two together so that, during normal operation, 55 50 that the pistons I4 ln one case extend horizon tally and in the other case at an angle to aiïord support directly adjacent the welding electrodes. 55 plurality of inwardly extending stui’ñng boxes I6, each of which is arranged for the guidance and iluid-tight passage of a piston I4. A plate 20 serves to support individual guiding brackets I8 60 through which extensions 24 threaded to the pistons as indicated at 22„are adapted to ex tend. 'I‘he threaded arrangement is provided to the socket I0 carried by the lower one moves op positely to a nut member 50 carried by the upper one. 'I'his nut member 50`is held against rota tion by sliding engagement with the rod 46. The. nut member 50 has secured thereto a cable 54 60 which passes over a pulley,52,supported either directly by a roof or‘by a. traveling crane. Such enable ñne adjustment to be made to insure that crane is’deslrable if it is necessary to move Vthe proper equalization of -holding pressure is ap-‘ work after the welding is completed to a sub stantial lateral extent to- a point of delivery. 65 65 plied about the tube. 'I'he extensions 24 are pro vided with bifurcated ends 25 supporting pins 29 on which, through the medium of roller bearings 21, there are mounted holding rollers 26 having their peripheries properly shaped to engage the 70 particular fins which are being applied. It will ì be noted that the bearings liet'wholly within the axial limits of the rollers. ~Such. arrangement » serves to prevent to a considerable extent' the rentrance of spattered metal into the bearings, 75 such spattered metal being produced during the The cable 54 may be -secured tothe top of the work in any suitable fashion, for example, t6 `a member clamped to or secured within the tube A. The ñnished work is indicated at A' in Fig. 1. The supply of air or liquid for the operation of the pistons I4 is provided through a tube 55 - which communicates through a three-way valve 58 with a pipe 62 connected to branches 64 and 68. A pipe 60 provides for the exhaust of fluid from . the three-way valve when it is desired to release 76 3 2,132,975 the holding means from the work. A hand oper ated valve 66 interposed in the line 84 may be used to control the introduction of iiuid to the upper tube or cylinder l2’. Communication to the lower cylinder I2, however, is controlled by a manual or automatically operating valve 10 which is of three-way type and serves to control the delivery of iluid to the cylinder through pipe 14 or its exhaust from the cylinder through pipe lll 18. Normally when pressure is applied to hold the work, the valve operating handle is in its lower position. An extension 16 on the socket member lll, however, is designed to move the handle 'l2 upwardly as it rises, cutting ofi the supply and exhausting the cylinder l2 so that the pistons i4 and the rollers 26 are withdrawn from the work to enable the socket member to pass. There is best shown in Fig. 3 the type of work which is accomplished by this apparatus. Each oi the fins B is welded to the tube A as indicated interlocking control devices to lnsur/e the proper combined operation. „ ; \ There is indicated at 80 a constant potential generator driven by a motor (not shown) sup plied with commercial current. Because of the 5 y >necessity for ilexlbility of operation and close con trol, it is desirable to use direct current for the drive of the parts and consequently' the gen erator is of a direct current type so arranged as to maintain a substantially constant line po 10 tential of about _sixty volts irrespective ci varia tions in the commercial supply. ’l’lce'constant potential leads from generator are indicated at 82 and 8B. , The armature of the hoist motor 36 is indicated 15 by that numeral in Fig. and is connected across the line through a reversing switch ‘2id and a relay switch 88, there being in the circuit . overload relay coil 85 adapted to open coute 3 @l if an excessive current is taken by the met "Fh l@ o@ along its entire length, the welding wires being - tactor Si is illustrated in the lower portier n lf3’ diagram in its relationship to otite control de into the junctions as indicated in Fig. 2. .As soon as 'the welding starts after the parts to loe welded are assembled, suiliclent engagement in the nature of a tacking is provided so that as the tube A. is lifted, the fins B will be lifted there with. While the socket member l0 may be used initially, therefore, it need not ,necessarily be utilized after the welding begins for the raising @il ci the tube. It may accordingly be arranged so as to have only a limited movement, although in the particular arrangement illustrated it serves for the support of the tube throughout substan tially its entire movement. Its upward rise, of course, ceases as soon as it clears the threads on the screw I0. The rollers 26 are primarily relied upon to maintain the parts in proper alignment. The welding takes> place as slow upward move ment of the tube and fins occurs. Due to the fact that the tube is vertically and peripherally guided as it moves, there is no substantial `tend ency for the parts to become misaligned by ilexure or warping. Warping is particularly prevented7 45 when a number of iins or the like are being simul taneously welded to the tube, by reason of the evendistribution of heat about the same. Even, however, if only a. single iin or flange is being attached, the type of support which is used, namely, vertical suspension, prevents a dis turbance of the proper relative positions of the elements. The pressure applied by each of the vices. The motor 3E is provided ‘llelcl 8|! in series with which there rheostat 552 which is adjustable to ' a ` ` rheostat speed ofmay operation be short-circuited or. the hoist by 'the contact , @d in order to secure e. larger starting torque. This contacter Sli will erred to Since the high speed aisé; motor' not inter“ 30 eonnected shown in ‘the with wiring the automatic controls, This motor it may be of any desired ‘type operated either the constant potential supply or directly ' 1. the commercial supply the plant. 3f cated Theatarmature |22. This of generator the welding is driven generator by aismotor which may be energized either from the constant potential supply or the commercial supply. A separate exciter (not shown) supplies the shunt 40 field ||8 of the welding generator which has a series field l24. Welding current is supplied through this series field, a reactor §26, contacter |28 and relay coil |38 to the line 82 and to the welding line |32 connected to the electrode i258, 45 which is adapted to weld the grounded work i3d. A separate generator is supplied for each elec trode and in the present instance the connec tions are diagrammatically illustrated in such fashion as to cause the Welder to be of the con rollers 28 may -be of the order of one hundred Welder is well known and involves the automatic feed of the electrode wire in such fashion as to pounds. After the welding is completed, the maintain a certain predetermined arc. 55 tube may be discharged by the suitable lateral displacement of the cable as the nut 50 is caused to move rapidly upwards by the rapid operation of the motor 86. ' 50 stant current automatic type. This type of Only so much of the control devices is illustrated as 55 serves to indicate the relationship thereto of cer tain control relays referred to hereafter. The control devices include a motor H0 provided with In order to-lnsure the production of proper re sults, it is desirable that an apparatus of this a shunt iield ||2 directly connected across the constant potential line, said motor driving a con 60 type should be automatic to as great a degree as possible so that if any accident occurs which trol generator |88 vwhich is connected through might result in improper work, the entire opera tion will be interrupted. If welding by any one of the units should be interrupted, all of the weld a relay control contactor |40 and reversing switch |42 to the armature IM of an electrode feed motor which is provided with a shunt field |46. The fields |48 and |52 are interconnected to the con 65 ing should cease. Furthermore, if, for some reason as. for example, an overload, the feed of the Work should slow down, the welding should be stant potential lines 82 and 84 and to the weld ing current line |82 through an adjustable po tentlometer I 48 and relay control contactors |58 interrupted, otherwise welds of improper type would result. In order to provide a substantially complete automatic operation, various electrical and |84 as illustrated. Switch |42 may be manu ally operated to eli'ect forward or reverse feed of 70 elements are provided of the types indicated in Fig. 9, which figure represents a wiring diagram showing not only the major operating elements such as motors and generators, but also various thé‘welding wire. The control is otherwise auto matic and of conventional type to insure a proper feed during the' operation. The contactors |40, |88 and |84 are controlled as described belor.y The lower portion of Fig. 9 illustrates the auto i ' . arenoso matic connections which insure a proper related operation oi the various elements of the appara tus and particularly insure a complete shut-down whenever one of the arcs rails. Certain of the parts of this controlling assembly are duplicated erator i136 and wire feeding motor ldd. Closure of contactor l'lél energizes relay coils il@ and lit. The former closes the contactors l5@ and 55d, energizing the ñelds ldd'and i552 of the motor lill? and generator §33, respectively, thereby causing to the number oí welding heads which are pro the generator to operate the motor to feed the vided. In order to indicate the interconnections ‘ wire forwardly toward the work. The closure of ' of the parts when a plurality ci welding heads are contactors t28 closes the corresponding welding associated as in the present case, the parte a circuit so that when the wire electrode contacts sociated with one welding head are shown in full with the work an arc will ‘be struck. As the in 10 lines, while certain parts associated with a sec dividual arcs are struck, the corresponding relay designated ond weldingbyhead numerals are shown. corresponding in dotted with lines,those coils it@ are energized, closing the contactors 2 l@ and opening the contacts âäl. As each contactor of elements of the ñrst head, primed. From this arrangement, showing the association of parts for two heads, it will be obvious how duplication 2t@ is closed, the corresponding relay coil 2id is energized, closing its associated contactor Zit. ‘When all ci’ the contactors 2id corresponding to can be continued to the extent ci taking care ci any number of heads. the welding heads which are in operation are Each of the welding heads has its individual start switch itâ and stop switch il@ intercon nected as diagrammaticaliy illustrated so that when the start switch is closed the stop switch is opened. if only some of the total number oi welding heads are to be operated, then the ap paratus is prepared by closing the switches it@ of those heads which are to be operated and leaving switches ldd open (and consequently llt closed) ci those heads which are not to be used, It will` be noted that the various switches lill 3@ are shunted across corresponding relay controlled contactors 2115. As will be clear hereafter, the various contactors 2i@ for the several units are arranged in series to close a circuit only if all of contactors di@ are closed or, alternatively, if for 3d, each contactor 2l@ that is not closed there is closed the corresponding switch il@ to complete the series. Two interconnected switches l5@ and 55d, which may be designated as “inch” and “run” switches, are provided, there being a single pair of these for the entire apparatus. During normal operation the “run” switch läd is closed. The purpose of the ‘inch” switch will be referred to hereafter. A master stop switch itâ and start switch l5@ are provided, the former serving to shut down the entire apparatus and the latter, by its de pression, serving to set into operation the various controls to bring the Various parts into action in proper sequence. y ~ , The construction of the control circuit will be clear from a description of the operation involved in starting up the apparatus. Assuming that everything is shut down, the proper switches ltd are closed to predetermine the welding heads 55 which are to be put in operation. As pointed out above, for any switch |68 that is opened, the cor~ responding switch llt is closed. The operation 50 closed, they, together with the closed switches il@ of the idle heads, complete a circuit from the junction 22@ through normally closed switches H32 20 and H58 through relay coil ld@ to line 86. The coil itt is thus energized, closing contactors it@ and itt. The coils itlâ shunted by resistances itt are adapted to produce a time delay action in the control of contactors 2 l 6 in order that fluc tuations of short period or normal instability of the arcs will not result in shutting down the ap paratus, contactors 2 it remaining closed through such transient disturbances. The resistances 226 which are shunted across coils 2id whenever the 30 relay coils it@ are deenergized, also serve to aid in such stabilization. The closure of contactor itt does not imme diately effect any result, since its circuit >is open at contactor 2id. Closure of contactor E815, how ever, through normally closed overload relay con tactor 9i, connects junction 222 to line 82. Such connection through normally closed contactor lill energizes relay coil §38, which opens contactor is@ and closes contactor H92. Closure of E92 in turn energizes relay coil ist, resulting in closure of contactors it@ and |198. Closure of §98 serves to energize the time delay coils 2M and 262, which serve to thereafter prevent rapid drop ping oi’ the contactors controlled by coils i88 and ist. The time delay is adjustable through the resistance means indicated at 2M, connected across the coils it@ and 2t?. Closure of contactor ist simultaneously with ldd serves to energize both coils 2% and 20d. Energization of coil 2% closes contactor 9d, short-circuiting the ?leld rheostat 92 for the purpose indicated above of insuring high starting torque of the welding hoist motor 36. ` Energlzation of coil 268 _closes contactors 2l@ and 2id and opens contactor itl. Closure of contactor 2id connects 'coil 20d between junction 222 and line '8d and consequently this relay is of the entire apparatus is then initiated by clos ing the master start switch i513 and holding such self-holding. The opening of contactor itl de energizes coil itt and consequently, due to the switch closed until all of the arcs are struck. Closure of l5@ energizes relay coil ltd, closing time delay action, contactor it@ is closed and contactor itt. The closing of contactor ltd B92 opened after a predetermined interval. The serves to connect the junction 220 to the line t2., closure of itil results in energization of coil 2li this junction being used as a convenient refer through now closed contactor 2id. Consequently, contactor t8 is closed and the welding hoist mo 65 ence point in the further description of the oper ation. tor started, the torque being initially quite large The energization of 22@ serves, through each of the closed switches E68, to energize a correspond due to the continued closure of contactor 9d. The opening of H92 results in deenergization of coil lllél. Accordingly, after a predetermined in terval, contactors ist `and ist are opened, re 70 sulting in deenergization of .coil 296, which drops contactor Qt, thus bringing into the shunt field circuit of the welding hoist motor the adjust able rheostat 92. The motor then operates at its predetermined speed to move the work prop 75 ing relay coil W2 of which there is one for each 70 welding head. These relay coils, together with il@ and llt, are not shown duplicated, since the connections of the individual sets will be readily understood. Energizatlon of coil H2 serves to close contactors lll@ and llt. The former of 75. these closes the circuit between the control gen 5 2,132,975 . erly past the welding electrodes. Finally, coils through one or more of the closed switches |68 The closure of contactor 2M now connects through the corresponding relay or relays |12 serving to set into complete operation the asso ciated welding heads in the fashion outlined 2ß8 and 212 remain energized. junction 221| to line 82 through the contaetor ce |86. Since energization of 220 now results in continued energization of relay |30, this relaybe comes self-holding and the master start switch l54 may be released to its normal opened posi--> tion. Its opening deenergizes relay |64, which lil, drops contacter |66. The apparatus vis now in its normal running condition, the work being moved upwardly by the welding hoist motor and the arcs being main tained in proper condition automatically. The stopping of the apparatus either automati cally diie 'to manual intervention is dependent upon rgization coil itil. if the master stop solo d2 is opened, it will be obvioi‘ts` that auch deericigsation will result causing contactera let and im'ì be dropped so that the coil will ierglzed upon release of stop switch ,y opening of switch. ißt, causing a of 203 and consequently of ïxeenergíoation ot inaction itil re-1 salts lo sperling of. the relays 'which control the ‘weldlrlf initially It is also locating sometimes the work desirable, preparatory particularly to start ing the welding, to cause the slowly operating hoist motor rather than the high speed hoist motor to more the work without, however, irl-a ltlatirig action of the Welling heads. La order to accomplish this, there is provided the switch 22d. which is normally operi and may be opened after closure 'oy depression or a button ‘225 connected thereto. Closure of switch 221i results in einerN gization of the junction l22, which, due to the opera'orls described above, results in the startm 'beingorunder tire welding substantial hoisttorque motorby3E,reason the of 'the 'îïritial short circuiting ci the rheostat 92, whi i ' series with the shunt field 9G by '”` contacter Si. . the Various automatic electrical " - l ltioried alcove, provision is made 2d so rater circuit and also the wire iced ing apparatus. Stepping might also occor due overload of the welding hoist motor, which ‘will contacter to be opened, thus «aleen ergirio relay 20d and opening the circuit, de energ‘.I relay lil@ loyk causing ari opening ci contacter The apparatus will accordingly again : alcove. It will be obvious that taclring or the like can be accomplished. . down. " ers is effected bi" 'cy connecting - @triatlon oi the main valve it to a source or' compressed fluio. î Their with» drawal is effected by connecting th " cylinders to the atmosphere through passage y arl-other down ol’ the apparatus also results ,manipulation or" the valve 58. The lower old-ing members, however, can be withdrawn ‘for the reason just indicated by movement ol the valve handle l2 by the contact with it of the extension resulting from freezing of the electrode to the lâ carried by the supporting member it, such Glosl i from dropping orally one of the contactera 216 diie to more than momentary breaking of the are or e. short circuit of the welding generator work. lo the latter case the voltage of the weld contact serving to move the handle 'il to its upper g«n crater" drops oi’f, dcenergizing a relay |30 to such extent as to cause it to drop contact 219 position to vent the cylinder i2 to the atirl-os-s _ just as it will if an arc should become broken. lower members may, of course, be effected by hand manipulation of the valve El. "rali/e t5 serves to cut out the upper holding me allers if it is desired manipulate only the lower ones. Preliminary manual adjustment of the screw ilîl relative screw 4U is provided by the ratchet t3,‘which can be used to tighten cable 5t so that it does share the siii-poli ol the When contact 219 is dropped, the circuit or coil iiß is again immediately closed through the Variable resistance 22d and contacter Ztl. action el coll 2|8 is thus made sluggish and vents immediate dropping of the contacter ‘The interval before the dropping of the named contacter The pre-s 2|6. last also to some extent cori trolled by adjustment oí resistance |83. Al~though contacter ‘Mil opens before 22| closes, the operation. is very fast and takes place before the coil ‘M8 is entirely deenergized. After the apparatus is closed down for any of the above reasons, it must be restarted in the -manner described by pushing the master con trol button |54 so that the parts oi' the apparatus are brought into operation in proper sequence. It is sometimes desired to produce welding at only one spot for the purpose of tacking or the like. To eilîect such result, it is only necessary to push down the “inch” button |56 after there pliere. Separate 'manual manipulation work. ln the preliminary ajustements, ' also be used operation oi the wel ‘ i these replay ». heist motor manipulation independently or" switch ci ttl. tlieweldipg ln the placing means of the work and the removal from the apparatus after welding has been completed, the high speed 55 reversible motor 9B is, of course, used. -As pointed out above, the method and appam ratos of this invention are applicable to perform the welding operations to produce dih’ererit types oi elongated tubes. In Fig. 5, for example, there 80 is shown a built-up tube of polygonal cross-sec tion made from angle members G welded tow has been closed one or more of switches |68 cor gether at opposite corners as indicated at H. The responding to the head or heads which are to be angle members G may be held together by sult able forms of rollers 26 and welding accomplished 65 simultaneously along the two seams I-I by the use of two heads. At the same time, or thereafter, there may also be attached iins such as indicated at I. Fig. 6 is also illustrative of the character of work which may be accomplished. Scams D 70 may be Welded to hold together the -two semi circular parts C to form a iinished circular tube. 65 operated. û While the “inch” switch is in parallel with the master starting switch 154, it will be noted that the switch |58 is opened, thereby resulting in operation only so long as the "inch” button is held depressed against the action of a spring nor mally tending to open it and close the “run” switch |58. Because of the fact that “run” switch |58 is opened, the coil |80 is not ener ` Such operation may be accomplished particularly gized and therefore the welding hoist motor is where _the resulting tube is not to be perfectly not operated. However, connection is made àrcular'in form but is to have an irregular shape 75 aisaere which, in certain instances, may not loe capable or” being rolled, Yout which may he built up by such speed as to eEect proper progressive weld=~ ing., /f , welding together separate parts. Various types a. lllfelding means including welding apparatus ci fins or lengthwise runntng plates or the like >may te attachee as indicated at and Ir“, and such attachments may "oe accomplished simulta for suspending vertically arranged elongated arti= occupying a substantially ñxed position, means neously with 'welding of the parts of the tube. To handle parts oi diiîerent forros of the types iruiicatecir it is only necessary to modify the hold cles hy their upper ends and for moving thernver« tically in the, direction oi their lengths past ' welding apparatus to produce progressive rv ing, and means for holding in proper contact ing means in a suitable fashion which will loe portions of said articles which are to loe Weide@ l olovious. 5. Welding means including welding apparatus . 't vwill loe clear that various changes may be made in the emeodimentoi the invention with out departing from the scope thereof as donned the following claims, What L’ claim and desire to protect 'foy Lett-ers “Patent is: for suspending vertically arranged elongated articles loy their upper ends and for moving them vertically iu. the direction ci their lengths past said Welding apparatus to produce progressive welding, and means operative at a _ il Welding means including Welding apparatus occupying a substantially fixed position, means for supporting elongated articles and moving there in the direction oi their lengths at a prede termined speed past said welding apparatus to produce progressive welding, aud means :tor in=terrupting the welding if the predetermined movement does not occur. occupying a substantially :ïixed position, roe-aus - location adjacent the Welding apparatus for pressing said articles together to hold them proper asseniu bled relationship as they move vertically during 20 the Welding operation. o. Welding means including a plurality oí sul:`=1 stantially fixed electrical Welding units, means for suspending vertically arranged elongated articles by their upper ends and forA moving them 25 2- Welding means including Welding apparat vertically in the‘direction of their lengths past ccupying a substantially ñxed position, means said Welding units to produce simultaneous pro gressive welds Toy said units, and means for hold `ing in' proper contact portions of said articles ier supporting elongated articles and moving them in the direction oi their lengths past said 30 welding apparatus to produce progressive Weld which are to ‘be welded. ' 7. Welding means including a plurality of elecu ing, and means including members occupying fixed positions pressing said articles together to trical Welding units occupying a substantially hold them in proper assembled relationship to< fixed position, means for supporting elongated the said last means, and means for automatically withdrawing said pressing members after a pre determined advance of said elongated articles. 3. The method of welding vertically arranged elongated articles comprising suspending said articles yity their upper ends and moving them di) vertically in the direction of their lengths past used Welding apparatus, said advance'loeing at articles and. moving them in the direction oi’ their lengths past said Welding apparatus to 35 produce progressive Welding, means for prede termlnlng the Welding units, less than all there of, `which are to operate, and means for substan tially simultaneously initiating operation oi' such predetermined units. i . PERRY E. SHAVER.