Lincoln Electric Tandem MIG High-Speed and High-Deposition Welding User's Manual
Contents
1. Horizontal flare joint Poor 1 Seamer applications NO Joints Known to be subject to arc blow amp Weld joints that have multiple or severe turns in direction or contour iN Thin gage square edge butt welds APPLICATION LK lale aae High Speed and High Deposition Welding Configuring Tandem MIG Hard Automation Systems Models AD1202 1 and AD1202 2 A Power Source Tandem MIG Power Wave 455M Robotic or K2262 1 TM E E Tandem MIG Power Wave 655 Robotic E K1519 1 TM Wire Feeder Power Feed 10R Wire Feeder K1780 2 K1780 2 C Interface Controller G3207 185 G3207 185 DeviceNet Communication Cables trunk line 19 5 ft e RO 800 amp Tandem MIG torch S22693 XXX S22693 XXX or or or 900 amp Tandem MIG torch G3494 XA G3494 XA 4 0 Work ground cable 25 ft 22693 XXX series torches require 1 water cooling package per torch G3494 XA series torches require 3 ae a za eI a SSS z Le od E eaer ro rae T h e n 0 Fed Mes LIU E lt Oo f we ldion ge i ss 1 ees Ch wer Lee ee APPLICATION LKe tale aE High Speed and High Deposition Welding Configuring Tandem MIG Robotic Systems Models AD1201 1 and AD1201 2 Y Power Source Tandem MIG Power Wave 455M Robotic or K2262 1 TM E Tandem MIG Power Wave 655 Robotic ee K1519 1 TM Wire feeder Power Feed 10R wire feeder K1780 2 K1780 2 Gabeiumer Beanie epmeiny CTO 4 0 Work ground cable 25 ft Dual channel De2. Our challenge is to meet the needs of our customer and to exceed their expectations On occasion purchasers may ask Lincoln Electric for advice or information about their use of our products We respond to our customers based on the best information in our possession at that time Lincoln Electric is not in a position to warrant or guarantee such advice and assumes no liability with respect to such information or advice We expressly disclaim any warranty of any kind including any warranty of fitness for any customer s particular purpose with respect to such information or advice As a matter of practical consideration we also cannot assume any responsibility for updating or correcting any such information or advice once it has been given nor does the provision of information or advice create expand or alter any warranty with respect to the sale of our products Lincoln Electric is a responsive manufacturer but the selection and use of specific products sold by Lincoln Electric is solely within the control of and remains the sole responsibility of the customer Many variables beyond the control of Lincoln Electric affect the results obtained in applying these types of fabrication methods and service requirement Subject to change This information is accurate to the best of our knowledge at the time of printing Please refer to www lincolnelectric com for any updated information WHAT IS NEXTWELD The challenges facing industrial fabrica
3. speeds require the use of larger wire diameters or higher wire feed speeds Both choices will cause an increase in current draw The added current draw creates added penetration that must be managed With a single wire GMAW process the penetration is most intense at the point where the axial flow of material from the welding wire is directed on to the plate This area is focused to a small area that is generally the cross sectional area of the welding wire diameter In order to manage the additional finely focused penetration wire placement becomes more demanding joint fit up becomes more critical If joint alignment is not maintained and the welding arc wanders off the seam concentrating the arc on a single metal thickness burn through is a common result If joint fit up is not maintained welds often penetrate well into the open joint creating an unacceptable undercut If the penetration is not successfully managed the common result is cosily increased rework or scrap 12 Gauge Lap Weld at 120 ipm travel arc rides the pool created by the lead electrode the pressure from the trail arc flattens the created weld pool to eliminate the tendency for the pool to rise and hump The applied weld pool pressure from the trail arc is used to not only limit the tendency of the lead weld pool to hump and lose follow capability but the pressure is adjustable allowing the bead contour to be modified to meet application requirements and Underc
4. 0 reduction in heat input when compared to larger diameter single electrode processes Lower heat input can substantially reduce post weld straightening activity caused by distortion 1 2 Flat Fillet at 20 ipm 8 mm Horizontal Fillet Multi pass Butt Weld 2 Pass J Groove a Kelate as Wis ic APPLICATION High Speed and High Deposition Welding Comparing High Speed Tandem MIG To Single Wire GMAW Processes Better Weld Metal Follow Characteristics Problem Single Wire GMAW As higher travel speeds are explored with conventional single solid and metal cored wire GMAW processes one of the factors that limits obtainable travel speeds is a phenomenon referred to as bead humping or lack of follow The lack of follow occurs as a number of physical metal flow requirements break down The coalescent properties of the weld pool are not strong enough to pull the puddle along while at the same time the higher travel speeds limit the heating of the plate that would normally allow the weld pool to wet or flow along the weld bead edges Solution Tandem MIG The spacing of the two arcs of the Tandem MIG process is designed to overcome the lack of follow associated with single wire GMAW processes The lead arc provides initial penetration into the base plate and a preheating of the plate for the trail arc The trail Reduced Tendency Towards Burn through Problem Single Wire GMAW Increased travel
5. LINCOLN EF THE WELDING EXPERTSsu WAVEFORM CONTROL TECHNOLOGY Tandem MIG High Speed and High Deposition Welding Fast travel soeeds on thin lap welds increase the number of parts per day Increased deposition on thicker materials reduces welding time and distortion SSS eee eS e The combined contribution of two separate welding arcs in one weld pool provides the control to overcome the lack of follow tendencies of single arc processes e Two small diameter Tandem MIG wire electrodes provide higher melt off LINCOLN rates per current drawn when compared to a single larger diameter wire ELECTRIC electrode at similar current draws e Higher travel speeds and higher deposition rates reduce part welding time cycles NEXTWELD T h e TSUP Ur e o f v a O S o ETSE AREAS Copyright 2005 The Lincoln Electric Company All rights reserved NX 3 70 10 05 LK tale aE APPLICATION High Speed and High Deposition Welding What Is It Tandem MIG is a dual wire GMAW process that is used in automated welding applications to improve welding productivity and part throughput The process utilizes two welding power sources and two wire feeders acting in tandem to deliver two wire electrodes through a single welding torch The dual wire welding torch capable of often doubling the welding output of a single wire torch is used in hard automation and robotic arc welding cells in the same manner as a single
6. common to structural building components offshore platforms railcar haulers machine bases large vehicle wheels undercarriages truck Suspensions and other fabricated components of metal thickness of 6 mm and greater are performed at deposition rates ranging from 21 35 lbs hr Single pass 5 16 flat fillets are commonly welded at 24 30 ipm with 2 045 diameter electrodes Single pass 5 16 flat fillets are commonly welded at 27 40 ipm with 2 052 diameter electrodes Bevel and V Groove Joints Heavy Plate Fabrication Structural Members and Industrial Equipment Single and multi pass beveled butt welds used in industries fabricating ship hulls earth moving equipment structural platforms pressure vessels beams and similar heavy plate weldments are performed at deposition rates ranging from 22 35 lbs nr Welds are commonly performed using like electrode diameters either 045 or 052 inch diameter The lead electrode provides root penetration the trail electrode adds to sidewall penetration J and U Groove Butt Welds Earth Moving Equipment and Heavy Plate Fabrication Single and multi pass J and U groove joints common to undercarriages rollover protection equipment sticks booms fifth wheels frames hydraulic cylinders pant legs and similar earth moving equipment components are welded at deposition rates ranging from 22 35 lbs hr Welds are performed at a 30 5
7. e within stable wire feed ranges The increase in wire diameter increases the required current draw associated with a given weld metal deposit rate Increased current draw produces higher heat inputs leading to part distortion and a large fluid weld pool that is difficult to control REDUCED HEAT INPUT EXAMPLE CURRENT ARC DRAW VOLTAGE 4 4 3 Lead 045 dia ER70S 6 dia 70 FCAW 3 32 dia ER7OT 1 GMAW 3 32 dia ER70C 6M ia 250 Solution Tandem MIG With the Tandem MIG process the two smaller diameter electrodes produce a lower heat input and improved weld pool control when compared to a larger single electrode process attempting to perform similar welds When compared to larger diameter electrode processes Tandem MIG typically reduces heat input by as much as 30 50 The trail electrode in the Tandem MIG process is operated in a special Tandem MIG pulse mode designed to cool the weld pool created by the lead electrode The combination of lower total heat input and the cooling affect of the trail electrode allows the trail electrode to be used to help control weld bead contour This provides the ability to better stack horizontal weld beads and produce flatter horizontal fillets while working at higher deposition rates DEPOSIT RATE TRAVEL SPEED Ibs hr ipm APPLICATION Tandem MIG High Speed and High Deposition Welding Comparing High Deposition Tandem MIG To Single W
8. each High deposition procedures may require flow rates as high as 70 cfh per electrode High deposition multi pass applications may require that a trailing gas is applied to eliminate nitrogen pick up The Tandem MIG process requires a binary gas mixture capable of supporting a spray transfer Argon Carbon dioxide or Argon Oxygen are the preferred mixtures 1 90 10 Ar CO is preferred for most welding applications 2 82 95 argon with a Ar CO binary mixture is a useable range The higher CO will promote added penetration but may produce added spatter The lower CO will produce less spatter 3 95 5 Ar O is recommended for high speed welding of thin gage material under 3mm The mixture will provide improved wetting at bead edges and reduced tendency to erode away edges of lap welds Work Lead Connection Tandem MIG welding should be performed welding in the direction from the work lead connection Welding towards the work lead connection may cause a convex weld bead and undercut Joint Selection The Tandem MIG process is ideal for many joint configurations A joint application rating is as follows Excellent 1 Lap welds in the flat horizontal 3 o clock position Fillet welds in the flat and horizontal positions Joggle welds in the flat position Beveled butt welds in flat position J Groove welds Ooo A W N Rotated roundabouts lap and joggle welds Good Beveled butt welds in horizontal position 2
9. eed Attempting to maximize deposition rates for a given wire diameter requires increasing the wire feed rate to the top or beyond its defined operating range As the process is pushed to its limit arc instability is often a result Arc instability creates increased spatter levels and weld porosity The elevated welding currents create weld pool turbulence that can cause root porosity or porosity just below the surface of the weld bead Solution Tandem MIG The two wire electrode configuration of the Tandem MIG process allows a higher total wire feed rate process Both the lead and the trail electrode may be creating a higher deposition rate Each electrode in operated in a stable operating range while the the Tandem configuration can be operated within an combined wire feed speed of the two electrodes often optimum operating range as defined by a single wire exceed a useable single wire process by 35 80 T h e f u LK tale aE APPLICATION High Speed and High Deposition Welding Comparing High Deposition Tandem MIG To Single Wire GMAW Process Reduced Heat Input and Improved Bead Profiles Problem Single Wire GMAW A single wire GMAW process has a useable weld metal deposition rate based on wire feed speed and wire diameter In an attempt to increase weld metal deposit rates rather than push a given wire diameter to unstable wire feed speeds it is often common practice to increase the wire diameter and operat
10. f 3 4 mm fillet welds used to weld structural trusses farm implements residential and commercial storage systems trash hauling containers and similar components are welded with 2 035 diameter electrodes to produce welds at travel speeds ranging from 80 100 ipm Larger 4 6 mm fillet welds common to structural beams light earth moving equipment ship stiffeners rail cars and similar components are welded with 2 045 electrodes at travel speeds ranging from 50 80 ipm 6mm Horizontal Fillet Joggle Joints 1 5 mm 4 mm Tanks and General Fabrication Joggle joints require a careful balance of joint fill and controlled penetration Tandem MIG provides the independent control of both providing needed joint fill without excessive penetration Joggle welds between 1 5 and 3 mm common to the light tank truck bodies trash hauling containers and similar components are welded at travel speeds ranging from 80 120 ipm using 2 035 diameter electrodes Larger 3 4 mm joggle joints used in larger tanks and thicker containers are performed at welding speeds ranging from 40 80 ipm using 2 045 diameter electrodes Joggle Weld WAVEFORM CONTROL es ee eo I oe i eo ic Aa a Kelate asWiuyic High Speed and High Deposition Welding Flat and Horizontal Fillet Welds 6 mm and Larger Railroad Structural Industrial Equipment Ship Building Off Road Wheel Manufacturing Flat and horizontal fillets
11. he feeder power source and existing equipment creates the foundation for a system with superior welding performance and reliability Patented Drive Roll System The Power Feed 10R is a basic wire feeder with an optimized design which consists of an industrial motor driving the feeder mechanism in a sheet metal frame The logic for controlling the wire feeder resides in a PC board inside the robotic power source Advantage Lincoln Digitally controlled by the Power Wave power source yielding the best performance in the industry e Use with Lincoln power sources featuring ArcLink the leading digital communications protocol for welding making it the best choice for seamless integration with the power source and networked equipment Tachometer feedback provides calibrated and precise control of wire feed speed e Feeder brakes from maximum speed to zero in milliseconds minimizing the chance of wire sticking in the puddle e Select standard or high speed gears for wide wire feed speed range e Split wire guides provide trouble free feeding and offer fast tool less wire installation changeover and maintenance e Easy to read gauge for accurate drive roll tension e Brass to brass connections for good connectivity between feeder and gun e Modular construction for easy servicing Self loading wire feature for easy set up APPLICATION LKe tale aae High Speed and High Deposition Welding Li
12. ing these functions the lead wire typically accounts for 60 or more of the total weld metal deposited The trail arc or second arc Lead and Trail arc functions for high speed welding Trail arc is focused on the crest of the pool created by the lead Gas Nozzle Lead Arc ____ lt Trail Arc nEn Weld Bead Lead Arc Molten Weld Penetration Penetration Pool Travel Trail Arc __ Completes Fill is Operated in a special Tandem MIG pulse mode The trail arc s function is to add filler metal to the weld pool and control the bead characteristics such as edge wetting physical contour side wall penetration and weld pool follow speed The trail arc should be kept directly in line with the lead arc and focused on the center of the weld pool The trail wire melting rate typically represents approximately 40 of the process deposition rate The Tandem MIG trail pulse waveforms are designed to operate at low voltages to limit arc interaction and minimize arc blow Lead and Trail arc functions for high deposition welding The trail arc is focused on the middle of the weld pool to create additional fill Gas Nozzle Lead Arc lt Trail Arc LE Penetration Past the Root The Lead Arc generates the majority of the penetration and leaves joint requiring additional fill Wets Edges The Trail Arc places a downward and forward pressure on the weld pool for better pool f
13. ire GMAW Process Deposition Rate Comparison Weld Metal Deposition Rate Single Wire GMAW vs Tandem MIG Lbs Hr Single Wire GMAW 40 Tandem MIG 30 20 10 1 4 5 16 3 8 5 8 Multi Pass Horizontal Horizontal Flat J Groove Beveled Butt Fillet Fillet Fillet Joint Type APPLICATION Tandem MIG High Speed and High Deposition Welding Using Tandem MIG Understanding Operating Variables The general rules governing operating variables for single wire GMAW arc welding also apply to Tandem MIG welding However there are additional considerations that must be kept in mind when welding with multiple arcs Since the two arcs will interact the type of power fed to each arc the wire feed speed ratio between lead and trail the arc lengths the wire positioning and torch angles must be set correctly The enclosed procedures are starting points and may need to be altered based on specific application conditions Adherence to the following guidelines will assist in achieving the maximum potential of the process Lead Arc The lead arc creates the majority of the penetration and should represent the majority of the total deposition rate of the process When using like diameter electrodes for the lead and the trail the lead should represent approximately 60 of the total wire feed In the case where a larger wire diameter is used as a lead for added penetration the lead should represent approximately 60 or more of
14. ncoln Welding Systems Featuring Tandem MIG Egi ew WER H FE Power Wave 455M Power Wave 655R For welding thicker materials in robotics hard The Power Wave 655R was designed for Robotic and automation PLC and semiautomatic applications Hard Automation applications that require extra power choose the Power Wave 455M The power source 650 Amps at 100 Duty Cycle features Waveform Control Technology for superior arc performance on a variety of materials including steel stainless steel aluminum and nickel alloys Custom control of the arc for each wire type and size provide Digital Communications enable the Power Wave to connect seamlessly to robot controllers and hard automation PLCs consistent welds time after time These Power Waves The Ethernet DeviceNet Gateway provides networking are designed to be part of a modular multi process capabilities and allows process and production monitoring welding system e Software based controls can be upgraded as new features become available e The Power Wave 655R has an output range of 20 880 Amps 1 7 a i oe O s a Eo Ul es ee oa I oe i ao ic A a Kelate as Wis ic High Speed and High Deposition Welding APPLICATION Lincoln Consumables used with Tandem MIG SuperArc SuperGlide Lincoln s SuperArc our premium copper coated MIG wire and SuperGlide our premium bare wire are the choice of welders and welding decision makers everywhere because of their e
15. ollow and wetting along the bead edges f Weld Bead ae See a i Lead Arc Molten Weld Penetration Penetration Pool Travel Lead Trail Arc Arc Completed Fill Root Sidewall Penetration Penetration The Lead Arc creates the initial root penetration and the majority of the joint fill The Trail Arc is focused in the weld pool providing additional joint side wall penetration and joint fill APPLICATION a Kelate as miu ic High Speed and High Deposition Welding Using Tandem MIG For High Speed Applications Flat and Horizontal Lap Welds 1 5 mm 5 mm Automotive Tank Fabrication Flat and horizontal lap welds common to automotive components like control arms stub or full chassis frames cross members shock absorbers struts stabilizer arms and flex axles are performed at welding travel speeds ranging from 70 130 ipm On thinner components with metal thickness ranging from 1 5 3 mm flat and horizontal lap welds are made with 2 035 diameter electrodes at travel speeds ranging from 100 130 ipm Thicker components with metal thickness from 3 5 mm are performed with 2 045 diameter electrodes at travel speeds ranging from 70 100 ipm This thin gauge lap weld was made at a travel speed of 100 ipm Flat and Horizontal Fillet Welds 3 16 4 8 mm Horizontal Lap Weld 3 mm mm General Light Gauge Steel Fabrication Shipbuilding Railroad Light gauge steel fabrication o
16. the total deposition The lead arc can be operated in a Tandem pulse CV or Power mode Pulse is recommended for the high deposition procedures Power mode or CV may be used for greater lead arc stability in high travel speed applications Trail Arc The trail arc is used to cool the weld pool and control the bead contour and is always operated in the Tandem pulse mode The trail should be kept directly in line with the lead arc and focused on the center of the weld pool The trail wire should represent approximately 40 of the process deposition rate The Tandem MIG trail pulse waveforms are designed to operate at low voltages to limit arc interaction and minimize arc blow Torch Positioning Torch positioning may be altered for specific applications A 5 degree push angle is recommended for high deposition welding A 0 5 degree angle is recommended for high speed welding Travel Angle Joint Angle Push Angle Flat Welds Horizontal Welds Beveled Butt Fillets Laps Lap 1 2 Wire Dia gt oi Travel 40 Direction rial A 5 degree push angle Horizontal Welds Horizontal Welds is recommended Small Fillet Large Fillet APPLICATION EKo tale aae High Speed and High Deposition Welding Using Tandem MIG Understanding Operating Variables Shielding Gas The lead and trail shielding gas should be of the same mixture and supplied through separate flow regulators Gas flow per electrode should be a minimum of 40 cfh
17. tors today are increasingly difficult Rising labor material and energy costs intense domestic and global competition a dwindling pool of skilled workers iairOnUey more stringent and Siem gage specific quality demanas Through our commitment to extensive research and investments in product development Lincoln Electric has established an industry benchmark for applying technology to improve the quality lower the cost and enhance the performance of arc welding processes Advancements in power electronics digital communications and Waveform Control Technology are the foundation for many of the improvements NEXTWELD brings you a series of Process Technology Application and Success Story documents like this one NEXTWELD explains how technologies products processes and applications are linked together to answer the important questions that all businesses face NEXTWELD e How can we work faster smarter more efficiently e How can we get equipment and people to perform in ways they ve never had to before e How do we stay competitive NEXTWELD is the future of welding but its benefits are available to you today Ask your Lincoln Electric representative how to improve the flexibility efficiency and quality of your welding operations to reduce your cost of fabrication LINCOLN ELECTRIC THE WELDING EXPERTSsw THE LINCOLN ELECTRIC COMPANY www lincolnelectric com 1 216 481 8100
18. ut Solution Tandem MIG The Tandem MIG process is able to achieve the high wire feed requirements of high speed welding without creating excessive penetration The required wire feed total for high speed welding is shared by the two electrodes forming the Tandem MIG process The shared wired feed speed not only reduces the current draw on each individual arc but disperses the total welding energy over two separate focal points The separation of the two focal penetration points allows more metal to be deposited without excessive penetration The lead arc is focused on the plate while the trail arc is focused on the molten pool created by the lead arc The trail wire energy is applied to the pool and not directly onto the plate This limits the overall penetration and allows the process to be tolerant of joint misalignment and joint gaps APPLICATION LKe tale aae High Speed and High Deposition Welding Comparing High Speed Tandem MIG To Single Wire GMAW Processes Travel Speed Comparison Typical Travel Speeds 140 Single Wire GMAW vs Tandem MIG Single Wire GMAW 120 Tandem MIG 100 Travel Speed ipm SO 60 40 2mm 2 5mm 3mm 4mm 5mm Lap Weld Size Comparing High Deposition Tandem MIG To Single Wire GMAW Process Higher Deposition rates Problem Single Wire GMAW A conventional single wire GMAW process has an optimum operating range based primarily on wire diameter shielding gas and wire feed sp
19. viceNet board S23319 62 S23319 62 24 Volt Power cable S23394 9 S233394 9 800 amp Tandem MIG torch 22693 XXX S22693 XXX or or or 900 amp Tandem MIG torch G3494 XA G3494 XA F Fanuc RJ3iB robot and controller 100 or 120 Series 100 or 120 Series Arc tool software 6 4 or above RJ3iB Controller RJ3iB Controller 9 ft Boom for wire feeder mounting AD1038 3 AD1038 3 Drive Roll Kit KP1505 XX KP1505 XX Not Shown Wire Straightener K1733 1 K1733 1 Not Shown Process Sense Leads K940 25 K940 25 4 0 Electrode Cable 25 ft L 4 0 25 14 14 L 4 0 25 14 14 2 Not Shown Torch water cooling package AD1013 3 AD1013 3 22693 XXX series torches require 1 water cooling package per torch G3494 XA series torches require 3 T h e f u Uuor e o f w e o S E e Tandem MIG APPLICATION High Speed and High Deposition Welding Lincoln Welding Systems Featuring Tandem MIG Power Feed 10R Wire Feeder Compact Wire Drive System for Automation The Power Feed 10R is a high performance digitally controlled wire feeder designed to be a part of a modular multi process welding system It is specifically designed to mount to a robot arm or to use in hard automation applications Modular systems can be arranged in a variety of ways for optimum customized performance and easy maintenance This four drive roll feeder operates on 40VDC input power and is designed to be used with ArcLink Robotic Power Wave power sources Close integration of t
20. wire welding torch would be The two welding arcs that are generated in the Tandem MIG process are electrically isolated from one another and are Tandem MIG Configuration controlled independently The welding arcs work together generally separated by less than 0 50 inches in the same weld pool The independent control of the two welding arcs is used to control the thermal and fluid dynamics of the weld pool to further enhance welding performance The added deposit rate achieved by the dual wire delivery and the added weld pool control is used to overcome single wire limitations to produce high travel speeds and electrode melt off rates weld metal deposition Special power source welding software is used to allow the two welding arcs to operate in unison Two Wire Feeders et POWER WAVE Two Separate Welding Arcs Shielding Gas Two Power Sources POWER WAVE One Welding Torch a Kelate as istic APPLICATION High Speed and High Deposition Welding How Does It Work The two welding arcs common to the Tandem MIG process have distinct functions The lead arc the first arc in the direction of torch travel is operated in a spray transfer mode The mode may be either a special Tandem MIG pulse mode an adaptive constant voltage mode or a Tandem MIG power mode The lead arc s primary function is to establish initial root penetration and develop a molten weld pool for the trail wire While perform
21. xceptional consistency feedability and arc action A better arc means less spatter less clean up and improved productivity and premium SuperArc and SuperGlide deliver the best arc in MIG welding Our MicroGuard Ultra surface treatment with proprietary arc enhancement agents facilitates excellent weld puddle control very good wetting action straight bead edges and a wider operating range The exceptional feeding characteristics of SuperGlide made possible by MicroGuard Ultra surface treatment translate to reduced down time and high operator appeal Accu Pak 100 Recyclable Patented Package when the wire is consumed just remove the components collapse the box and throw into the recycle bin Lifting Strap for ease of movement from one location to the next Patented Ring Design Accu Trak This Accu Trak Drum Payoff Kit is made of a durable plastic for superior strength and integrity It also features two viewing windows 180 apart from one another for easy viewing of the wire as it is paying off A Payoff Kit must be used with Accu Trak Drums to ensure precise feeding The fitting on top of the Payoff Kit has a 1 2 14 NPT internal pipe thread to facilitate the connection of the conduit to 500 Ib Accu Trak drums Customer Assistance Policy The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment consumables and cutting equipment
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