The contact tip seizes in the gas diffuser, Troubleshooting and repair, Caution – Lincoln Electric POWER MIG SVM157-A User Manual

Page 44: Troubleshooting guide

TROUBLESHOOTING AND REPAIR

Observe Safety Guidelines

detailed in the beginning of this manual.

Troubleshooting Guide –

See Wiring Diagrams for location of specified

components and for troubleshooting of specific circuits.

F-10

POWER MIG 200

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the
Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-800-833-9353

CAUTION

WELDING PROBLEMS

PROBLEMS
(SYMPTOMS)

POSSIBLE AREAS OF
MISADJUSTMENT(S)

RECOMMENDED
COURSE OF ACTION

The weld bead is narrow or ropy.
May have porosity with the elec-
trode stubbing into the plate.

The contact tip seizes in the gas dif-
fuser.

1. Make sure the welding proce-

dures and electrode polarity are
correct for the process being
used.

2. Make certain the shielding gas is

correct and the flow is proper.

3. Make sure the weld joint is not

“contaminated”.

1. The tip is being over heated due

to excessive current and/or high
duty cycle.

2. A light application of high temper-

ature anti-seize lubricant may be
applied to the contact tip threads.

1. Perform the Output Bridge Rectifier

Test.

2. The output capacitors may be faulty.

Check for loose connections at the
capacitors. Also check for leaky
capacitors. Replace if necessary.

WARNING: The liquid electrolyte in
these capacitors is toxic. Avoid con-
tact with any portion of your body.