Lincoln Electric TIG 375 manual TIG Problems

Page 38

E-7

 

TROUBLESHOOTING

E-7

 

 

 

 

 

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

PROBLEMS

POSSIBLE

RECOMMENDED

 

 

(SYMPTOMS)

CAUSE

COURSE OF ACTION

 

 

 

 

 

 

TIG PROBLEMS

Arc "pulsates" in AC polarity, DC

1.

Micro switch S2A on polarity switch

polarity is o.k.

 

does not open in AC polarity

 

 

 

Black area along weld bead

1.

Oily or organic contamination from

 

 

work piece

 

 

2.

Tungsten electrode may be conta-

 

 

minated

 

 

 

3.

Leaks in gas line, torch, or con-

 

 

nections

 

 

 

 

 

Output quits momentarily; gas flow

1.

May be caused by hi-freq interfer-

and hi-freq are also interrupted

 

ence. Check that machine is

 

 

grounded properly. Surrounding

 

 

machines that generate hi-freq

 

 

also should be properly grounded.

 

2.

Ground

connection

of Protection

 

 

PC board may has become loose

 

3.

Ground

connection

of Bypass

 

 

/Stabilizer PC board may has

 

 

become loose.

 

 

 

 

 

 

 

 

 

 

 

If all recommended possible areas of misadjustment have been checked and the problem persists, Contact your local Lincoln Authorized Field Service Facility.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

PRECISION TIG 375

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Contents Safety Depends on You Precision TIGSafety California Proposition 65 WarningsElectric Shock can kill Welding and Cutting Sparks can Cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a LʼArcThank You Table of Contents Duty Cycle-Applications Volts at Rated Amperes Amps InstallationRated Input Single Phase only Precision TIGTemperature Ranges Recommended Input Wire and Fuse SizesPhysical Dimensions Additional Output CapacitySafety Precautions Input and Grounding Connections Stick Electrode Cable Connection Output CABLES, Connections and LimitationsWork Cable Connection TIG Torch Connection Figure A.2Auxiliary Power Connections Figure A.3Robotic Interface Connection Figure A.4Pipe Thawing OperationProduct Description Welding SparksProcess Limitations Recommended Processes and EquipmentRecommended Processes Equipment LimitationsControls and Settings Figure B.1 Control PanelOperation TIG Mode Menu DisplayDo not USE 4-STEP if Using AN Amptrol Remote Advanced Panel ControlsOperation Stick Welding Features Internal SET UP ControlsTIG Welding Features Figure B.3 Figure B.4 TIG Weld Cycle Chart Setup Guidelines for TIG Welding With AN AmptrolFigure B.6 Gtaw Process Making a TIG Weld with AN AmptrolSmaw Process Field Installed Options AccessoriesFactory Installed Options Optional EquipmentRoutine and Periodic Maintenance MaintenanceSafety Precautions Overload ProtectionSpark GAP Adjustment Service ProceduresComponent Access UNDER-COOLER ServiceTroubleshooting HOW to USE Troubleshooting GuideCourse of Action SymptomsOutput Problems Meter Problems GAS ProblemsHI-FREQ Problems Preset & Output Control Problems Stick Welding Problems TIG Welding ProblemsTIG Problems Wiring Diagram Wiring Diagram Dimension Print K2622-1 Domestic Precaucion Aviso DE
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