Lincoln Electric SVM141-A Welding Operation, TIG Welding Guidelines, Twist Mate Electrode

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B-6

B-6

OPERATION

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8.Digital Voltmeter - This meter displays welding voltage, as measured on the output studs of the Square Wave TIG 275. After welding is complete, the meter displays the welding voltage corre- sponding to the peak welding current and displays this value for approximately 5 seconds.

9.Thermal Protection Light - A yellow light which only lights when an over temperature situation occurs. See the Maintenance Section for more information on thermostatic protection.

10.Power Switch - Controls the input power to the Square Wave TIG 275.

11.Polarity Switch - Selects DC+, AC or DC- welding polarity without reconnecting leads. DO NOT SWITCH WHILE WELDING.

12.Twist Mate Electrode and

13.Work Connections - Easy to connect electrode and work connections. This style Electrode Connection makes the gas and current connec- tions for the TIG torch at the same time. (Adapter plugs are provided with the machine.)

14.Remote Receptacle - For Amptrol, Arc Start Switch or Robotic Interface connection.

15.Optional Water Solenoid Connections - Easy to install this optional feature which allows for water flow control for water cooled torches.

WELDING OPERATION

TIG WELDING

Familiarize yourself with the Controls and Settings Section before attempting operation of the Square Wave TIG 275.

TIG WELDING GUIDELINES

TIG welding can be done in either the TIG 2-Step or the TIG 4-Step Weld Mode. TIG 2-Step is typically used with Hand or Foot Amptrols, with Remote Current control. TIG 4-Step typically uses an Arc Start switch and Local Current Control, because it provides a very brief current upslope, and a .5 to 10 second adjustable current downslope. TIG 4-Step also functions like a trigger interlock, making it unnecessary to hold down the Arc Start switch during a weld. This feature requires that the remote control device in use must have separate Arc Start and Output Control mecha- nisms. Read the TIG Welding Sequence of Operation sections for more details on 2-Step and 4-Step opera- tion.

Recommended tungsten electrode sizes, stickouts, currents, cup or nozzle sizes are shown in Table B.1.

SINCE WELDING APPLICATIONS CAN VARY, THIS CHART IS INTENDED AS A GUIDE ONLY.

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(2)

 

 

 

 

 

 

TABLE B.1 TYPICAL CURRENT RANGES FOR TUNGSTEN ELECTRODES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AC

 

 

 

Approximate Argon

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gas Flow Rate

 

 

 

 

 

 

DCEN ( - )

DCEP ( + )

Unbalanced Wave

 

Balanced Wave

 

 

C.F.H. (1/min.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Tungsten

 

 

 

 

1%, 2%

 

 

1%, 2%

 

 

 

 

 

 

 

Electrode

 

1%, 2%

1%, 2%

 

Thoriated

 

 

Thoriated

 

 

 

 

 

TIG Torch

 

Diameter

 

Thoriated

Thoriated

Pure

Tungsten

 

Pure

Tungsten

 

 

 

Stainless

Nozzle

 

in. (mm)

 

Tungsten

Tungsten

Tungsten

Zirconiated

 

Tungsten

Zirconiated

 

Aluminum

Steel

Size (4), (5)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.010

(.25)

 

2-15

(3)

2-15

2-15

 

2-15

---

3-8

(2-4)

3-8

(2-4)

#4, #5, #6

 

0.020

(.50)

 

5-20

(3)

5-15

5-20

 

10-20

5-20

5-10

(3-5)

5-10

(3-5)

 

 

0.040

(1.0)

 

15-80

(3)

10-60

15-80

 

20-30

20-60

5-10

(3-5)

5-10

(3-5)

 

 

1/16

(1.6)

 

70-150

10-20

50-100

70-150

 

30-80

60-120

5-10 (3-5)

9-13 (4-6)

#5, #6

 

3/32

(2.4)

 

150-250

15-30

100-160

140-235

 

60-130

100-180

13-17 (6-8)

11-15 (5-7)

#6, #7, #8

 

1/8

(3.2)

 

250-400

25-40

150-210

225-325

 

100-180

160-250

15-23 (7-11)

11-15 (5-7)

 

 

5/32

(4.0)

 

400-500

40-55

200-275

300-400

 

100-240

200-320

21-25 (10-12)

13-17 (6-8)

#8, #10

 

3/16

(4.8)

 

500-750

55-80

250-350

400-500

 

190-300

290-390

23-27 (11-13)

18-22 (8-10)

 

 

1/4

(6.4)

 

750-1000

80-125

325-450

500-630

 

250-400

340-525

28-32 (13-15)

23-27(11-13)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1) When used with argon gas. The current ranges shown must be reduced when using argon/helium or

(4)

TIG torch nozzle “sizes” are in multiples of 1/16ths of an inch:

 

 

 

pure helium shielding gasses.

 

 

 

 

#4 = 1/4 in.

(6 mm)

 

 

 

 

 

 

 

(2) Tungsten electrodes are classified as follows by the American Welding Society (AWS):

#5 = 5/16 in.

(8 mm)

 

 

 

 

 

 

 

Pure . . . . . . . . . . . . . . . EWP

 

 

 

 

#6 = 3/8 in.

(10 mm)

 

 

 

 

 

 

 

1% Thoriated . . . . . . . . EWTh-1

 

 

 

 

#7 = 7/16 in.

(11 mm)

 

 

 

 

 

 

 

2% Thoriated . . . . . . . . EWTh-2

 

 

 

 

#8 = 1/2 in.

(12.5 mm)

 

 

 

 

 

 

 

Though not yet recognized by the AWS, Ceriated Tungsten is now widely accepted as a substitute for

#10 = 5/8 in.

(16 mm)

 

 

 

 

 

 

 

2% Thoriated Tungsten in AC and DC applications.

 

(5)

TIG torch nozzles are typically made from alumina ceramic. Special applications may require lava nozzles,

(3) DCEP is not commonly used in these sizes.

 

 

 

which are less prone to breakage, but cannot withstand high temperatures and high duty cycles.

SQUARE WAVE TIG 275

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Contents Safety Depends on You Square Wave TIGSafety Square Wave TIGARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Cylinder may explode if damaged IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Square Wave TIGSafety Precautions Input Supply Connections Figure A.1Input Reconnect Procedure Return to Section TOC To Section TOCWork Cable Connection User Supplied ConnectorsOutput Connections Table A.1TIG Torch Connection Cylinder could explode if damagedTWIST-MATE Adapter for LA-9 and LA-17 TIG Torch TWIST-MATE Adapter for LW-18 and LW-20 TIG TorchCompleted Assembly Square Wave TIG Table of Contents Operation Section Fumes and Gases can be dangerous OperationElectric Shock can kill Welding Sparks can cause fire or explosionGeneral Description Design Features AdvantagesRecommended Processes and Equipment Welding Capability LimitationsControls and Settings Figure B.1 Control PanelTIG Welding Guidelines Welding OperationTIG Welding Twist Mate ElectrodeTable B.2 Recommended Polarity Settings for TIG Welding TIG Welding Sequence of Operation 2-Step TIG ModeTIG Welding Sequence of Operation 4-Step TIG Mode Hand and Foot Amptrol Operation Advanced TIG Welding FeaturesAC Wave Balance and Auto Balance Hertz Domestic Machines Auxiliary PowerStick Welding 50/60 Hertz European MachinesSquare Wave TIG Table of Contents Accessories Section C-1Section C-1Optional Accessories Accessories Included with MachineK963-1, -2 Hand Amptrol Table of Contents Maintenance Section Routine and Periodic Maintenance MaintenanceOverload Protection Control PC Board Component Location and AccessSpark GAP ASSEMBLY, High Voltage Transformer Display PC BOARD, ARC STARTER/BYPASS PC BoardFigure D.2 Major Component Locations Table of Contents Theory of Operation Section Input Power Circuit Theory of OperationOutput Rectification Control Board and Feedback Figure E.3 Output RECTIFICATION, Control Board and FeedbackHigh Voltage / High Frequency Circuit Figure E.4 High Voltage / High Frequency CircuitDC Welding Output Figure E.5 DC Welding OutputAC Welding Output Figure E.7 AC Welding OutputSCR Operation Figure E.9 SCR OperationThermal Protection Protective CircuitsOverload Protection Table of Contents Troubleshooting & Repair Section Disable Procedure Troubleshooting & RepairHOW to USE Troubleshooting Guide High Voltage / High Frequency can damage test equipmentPC Board Troubleshooting Procedures PC Board can be damaged by static electricityObserve Safety Guidelines Troubleshooting GuideDetailed in the beginning of this manual Perform the SCR Bridge Test Troubleshooting & Repair Connections Troubleshooting Guide Troubleshooting & Repair TIG Welding Problems Electric Shock Can KillTroubleshooting & Repair To Technical Specifications Stick Welding Problems Function Problems 15F-15Function Problems Installation Troubleshooting & Repair Test Description High Frequency Circuit Disable ProcedureMaterials Needed High Frequency Circuit Disable Procedure ProcedureT1 Main Transformer Test Test Procedure T1 Main Transformer TestReplace the case side covers Test Points Primary WINDINGS1GAS Water Solenoid Test GAS Water Solenoid Test Figure F.3 GAS Solenoid LocationStatic SCR Test Static SCR Test Figure F.4 Plug J1 Location on Control BoardAssembly Removal and Replacement Active SCR Test DescriptionActive SCR Test Figure F.6 Plug J1 Location on Control BoardFigure F.7 Active SCR Test Setup SCR Bridge Assembly Removal and Replacement Scope Settings AC TIG ModeNormal Open Circuit Voltage Waveform DC TIG Mode AC Stick Mode DC Stick Mode Machine Loaded to 255 Amps Typical Output Voltage Waveform Machine LoadedAT 30 VAC Machine Loaded to 275 Amps AT 31 VDCAC Stick Mode DC Stick Mode 50 V/Div High Voltage Transformer Removal Replacement Removal Procedure ReplacementHigh Voltage Transformer Removal Replacement Procedure Figure F.10 High Voltage Transformer Mounting InsulatorsSCR Bridge Assembly Removal and Replacement SCR Bridge Assembly Removal and Replacement Using the 3/8 nut driver, remove the caseFigure F.13 SCR Bridge Connections Refer to Figures F.11 F.13 Polarity Switch Removal and Replacement Polarity Switch Removal and Replacement Allen Screw Control Knobs Polarity Switch HandlePOS Micro Switch Leads Square Wave TIG 253Figure F.16 Polarity Switch Wiring Diagram Replacement Procedure For Steps 9--17, see Figure F.15 and F.16Description Main Transformer and Output Choke Assembly Removal and ReplacementFigure F.18 Transformer Connections Figure F.19 Polarity Switch Connections Choke NEG POS Micro Switch LeadsReassembly Procedure Refer to Figures F.17 F.19Input Idle Amps Minimum Acceptable Output Voltage AT Maximum Output SettingRetest After Repair Open Circuit VoltagesSquare Wave TIG Section G Electrical WiringDiagram L10747 TIGDiagram L10747-2 SquarewaveElectrical Diagrams Control Board Schematic G3358-1Control Board Schematic G3358-2 OCI4 TRI3 MT2Display Board Schematic L10768 Return to Section Return to Section TOC To Section TOCBypass Display Board Layout L10770-1 L10770-17-24-98XXX Bypass Board Layout L10121-1 10G-10Square Wave TIG

SVM141-A specifications

The Lincoln Electric SVM141-A is a cutting-edge solution designed for operators requiring precision, efficiency, and versatility in their welding applications. This machine is known for its compact form but robust feature set, making it an ideal choice for both professional welders and industrial applications.

One of the standout features of the SVM141-A is its advanced inverter technology. This innovation allows for a stable arc, providing consistent results even under varying conditions. The machine minimizes power consumption, making it energy-efficient without compromising performance. The inverter technology also supports a wider input voltage range, making the SVM141-A suitable for use in diverse environments and job sites.

Another key characteristic is its multi-process capability. The SVM141-A supports MIG, stick, and TIG welding processes, providing flexibility for various welding tasks. This versatility enables operators to tackle different materials, including mild steel, stainless steel, and aluminum, making it a valuable tool for numerous projects.

The user-friendly interface of the SVM141-A includes an intuitive digital display, which allows welders to adjust settings with ease. This feature is crucial for ensuring the right configurations for specific welding tasks, reducing the chances of errors and enhancing the overall finish of welds.

Safety is also a priority with the Lincoln Electric SVM141-A. It comes with built-in safety features such as overheat protection and automatic shutdown, ensuring operator safety and equipment longevity. The machine's lightweight design enhances portability, allowing it to be used in various workspaces with ease.

Durability is another hallmark of the SVM141-A. Constructed with high-quality materials, the machine is designed to withstand the rigors of demanding work environments. This ensures reliability over time, providing consistent performance even under heavy use.

In summary, the Lincoln Electric SVM141-A is a versatile, efficient, and user-friendly welding machine that appeals to a wide range of users. Its advanced inverter technology, multi-process capabilities, safety features, and durable construction make it a strong contender in the welding market, suitable for both professionals and hobbyists alike. Whether it’s for light fabrication, repairs, or industrial welding tasks, the SVM141-A meets diverse needs with precision and reliability.
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