Lincoln Electric IM467-B manual Troubleshooting Guide TIG Welding

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TROUBLESHOOTING

TROUBLESHOOTING GUIDE

TIG WELDING

Observe Safety Guidelines detailed throughout this manual.

SYMPTOM		CAUSE AND REMEDY
SYMPTOM		CAUSE AND REMEDY
Machine does not respond (no gas flow, no	1.	Defective Arc Start Switch or Amptrol. Check for con-
high frequency, no open circuit voltage) when		tinuity between pins D and E on cable connector when Arc
Arc Start Switch or Amptrol is pressed.		Start Switch or Amptrol is pressed.
	2.	Defective Protection PC board. Replace.
	3.	Defective Control PC board. Replace.

No gas or water flow when Arc Start Switch	1.	Gas supply is empty or not turned on.
is closed in TIG mode.	2.	Pinched gas or water hose.
	2.	Pinched gas or water hose.
	3.	Gas and High Frequency fuse (F2) blown. Replace fuse.
	4.	Gas and High Frequency fuse (F2) is too small. Use 1.5 amp
		fuse.
	5.	Gas and water lines or solenoids are blocked with dirt. Clean
		out and use filters to prevent recurrence.
	6.	Power PC board is defective. Replace.

No High Frequency.	1.	High Frequency switch S12 must be in either START or
		CONTINUOUS position for high frequency to function.
	2.	Preflow control is set too long. Reduce Preflow setting. (High
		Frequency does not come on until end of preflow period.)
	3.	Gas and High Frequency fuse (F2) blown. Replace fuse F2.
	4.	Gas and High Frequency fuse (F2) is too small. Use 1.5 amp
		fuse.
	5.	Spark Gap is too large. Set to gap specified on cover plate.
	6.	Power PC board is defective. Replace.

Weak high frequency.	1.	Spark gap is set too close. Set to 0.015 inches (0.381 mm)
		gap for most applications.
	2.	High Frequency Intensity control set too low. Increase to suit.
	3.	Work and electrode cables in poor condition, allowing high
		frequency to “leak” to ground. Use good quality cables,
		preferably those with a high natural rubber content, as short
		as possible.
	4.	No shielding gas. Adjust gas flow for 10 to 30 CFH (4.7 to
		14.1 l/min.) for most applications. (High frequency will not
		jump from the tungsten to the work without shielding gas.)

Machine shuts down (pilot light goes out	1.	If open circuit voltage is greater than 80 volts before shut-
and fans stop) when Arc Start Switch or		down occurs, Control PC board is defective. Replace.
Amptrol is pressed.

Cannot preset a current on Ammeter when the	1.	Defective Arc Start Switch. There should be no continuity
Arc Start Switch or Amptrol is not pressed.		between pins D and E of cable connector when Arc Start
		Switch or Amptrol is not pressed.
	2.	Defective Current Control potentiometer. Replace.
	3.	Defective Control PC board. Replace.
	4.	Defective Feedthrough PC board. Replace.

SQUARE WAVE TIG 355

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Contents Square Wave TIG Safety Electric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Thank You Table of Contents Section E Section CSection D P196 SeriesInstallation Technical Specifications Square Wave TIGSafety Precautions Select Suitable LocationHigh Frequency Interference Protection Input Supply Connection Input ConnectionsGround Connection Electric Shock can killReconnect Procedure Figure A.2 Input Supply ConnectionsVolt/Freq Nameplate AWG Copper Cond Table A.1 Recommended Input Wire and Fuse SizesTable A.2 Recommended Input Wire and Fuse Sizes Volt/Freq AC Output AWG Copper CondLengths up to 100 to 200 ft 200 to 250 ft Output ConnectionsTIG Torch Connection 100 ft 30 m 30 to 61 m 61 to 76 mStick Electrode Cable Connection Safety Instructions Operating InstructionsGeneral Description Operational Features and ControlsDesign Features and Advantages Recommended ProcessesWelding Capability LimitationsControls and Settings Upper Case Front ControlsHigh Frequency Switch Mode SwitchSTEP/4-STEP Switch Upper Case Front Control PanelAC Wave Balance VOLTS/AMPS SwitchPeak Current Control Auto Balance LEDSpot Controls Pulse ControlsStart Controls Figure B.2 Status Indicator Light Sequence Square Wave TIG Crater Fill ControlsOperation Lower Case Front Controls Figure B.3 Lower Case Frontcontrols Square Wave TIGOperation Hand and Foot Amptrol Operation Operation Stick Welding Welding OperationInitial START-UP TIG Welding GuidelinesIllustrated in the 2-Step Mode for clarity Table B.1 Specific Effects of ControlsCrater Fill Switch on OFFSpot Switch OFF Start Switch onPulse Switch on Crater Fill Switch on Spot Switch onTable B.2 Typical Current RANGES1 for Tungsten ELECTRODES2 Dcen Dcep + Unbalanced Wave Balanced WaveTable B.3 Recommended Settings for TIG Welding TIG Welding Sequence Operation 2-STEP ModeTIG Welding Sequence Operation 4-STEP Mode Polarity SwitchAuxiliary Power Overload ProtectionALL Machines Accessories OPTIONS/ACCESSORIESMaintenance Input Power Factor Capacitor Discharge ProcedureRoutine and Periodic Maintenance Figure D.2 General Component Locations Troubleshooting Guide General Machine TroubleTroubleshooting Guide Stick Welding Symptom Cause and RemedyTroubleshooting Guide TIG Welding TIG Welding Lower Panel Controls Accessories K870 Foot Amptrol or K963 Hand AmptrolDiagrams Dimension Print Square Wave TIG355 Equipment Installation Certification Equipment MANUFACTURER’S CertificationPage Precaucion Aviso DE