E-6

 

TROUBLESHOOTING

E-6

 

 

 

 

 

 

Observe all Safety Guidelines detailed throughout this manual

 

 

 

 

 

 

PROBLEMS

POSSIBLE AREAS OF

RECOMMENDED

 

 

(SYMPTOMS)

MISADJUSTMENTS

COURSE OF ACTION

 

 

 

 

 

 

STICK WELDING PROBLEMS

Stick electrode "blast off" when arc

1.

Current may be set too high for

is struck

 

electrode size

 

2.

(Machine with Advanced Control

 

 

PC board only) Hot Start Menu

 

 

setting too high

 

 

 

Stick electrode "sticks" in the weld

1.

Current may be set too low for

puddle

 

electrode size

 

2.

(Machine with Advanced Control

 

 

PC board only) Arc Force Menu

 

 

setting too low

 

 

 

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

TIG WELDING PROBLEMS

Poor starting in DC polarity

1.

Input line may be too low

 

2.

Bad connection at P11 of Control

 

 

PC board

 

3.

Bad Background rectifier, back-

 

 

ground resistor R7, or background

 

 

diode D2

 

 

Arc "flutters" in DC polarity, o.k. in

1. Tungsten not "sharp"

AC polarity

 

 

 

2.

Bad free wheeling diode D1 or its

 

connection

 

 

 

Arc "flutters" in both DC & AC polari-

1.

Tungsten electrode may be too

ties

 

large in diameter for the current

 

 

setting

 

2.

Gas shielding may be insufficient.

 

3.

Contaminated gas or leaks in the

 

 

gas line, torch, or connections

 

4.

Helium blend is used as a shield-

 

 

ing gas

 

 

 

 

 

 

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

Page 37
Image 37
Lincoln Electric IM936 manual Stick Welding Problems, TIG Welding Problems