Lincoln Electric IM355-C LN-9 GMA - Manual (Page 61)

TROUbLESHOOTING
E-7 E-7
LN-9 GMA and LN-9F GMA Wire Feeder
PRObLEMS
(SYMPTOMS)
Poor arc striking with sticking or
"blast-offs", weld porosity, narrow
and ropy-looking bead, or electrode
stubbing into plate while welding.
POSSIbLE AREAS OF
MISADJUSTMENT(S)
1. Verify that the welding techniques
or procedures being used are
proper. See "Gas Metal Arc
Welding
Guide" (GS-100),
"lnnershield Production Welding
Guide" (N675), “Outershield
Procedure Guidelines” (GSP-70,
GSP-71), “Procedure Guidelines
for Pulsed Spray Welding” (GSP-
PULSE) or "How To Make
Submerged Arc Welders" (S604).
2. Check that the wire feed
acceleration setting is proper for
the process. See the topic
“Starting Characteristics" in the
Operation section for proper
acceleration setting.
3. Check that the Voltage Control
Response is properly set for the
power source and process. See
the topic "Voltage Control
Response" in the Operation
section and the appropriate
power
source connection
diagram.
RECOMMENDED
COURSE OF ACTION
If all recommended possible
areas of misadjustment have
been checked and the problem
persists, contact your local
Lincoln Authorized Field Service
Facility.
If for any reason you do not understand the test procedures or are unable to perform the necessary tests/repairs
safely, contact your local authorized field service facility before you proceed.
WELDING PRObLEMS
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
TROUbLESHOOTING GUIDE