Thermal Arc A-07360, Руководство по обслуживанию, Страница: 56 / 102

FABRICATOR 210
6-2 June 19, 2006
6.02 Solving Problems Beyond the Welding Terminals
The gene r al app r oach to fix GMAW/FCAW p r oblems is to sta r t at the wi r e spool then wo r k th r ough to the MIG to r ch.
The r e a r e two main a r eas whe r e p r oblems occu r :
Porosity
When the r e is a gas p r oblem the r esult is usually po r osity within the weld metal. Po r osity always stems f r om
some contaminant within the molten weld pool which is in the p r ocess of escaping du r ing solidification of the
molten metal.
Contaminants r ange f r om no gas a r ound the welding a r c to di r t on the wo r k piece su r face. Po r osity can be
r educed by checking the following points:
FAULT CAUSE REMEDY
1. Gas cylinde r
contents and flow mete r
a. Ensu r e that the gas cylinde r is not
empty and the flow mete r is co rr ectly
adjusted to 25CFM (15 lit r es pe r minute)
2. Gas leaks
a. Check fo r gas leaks between the
r eulato r /flowmete r connection and in the
gas hose to the powe r supply
3. Inte r nal gas hose in
the powe r supply
a. The hose f r om the solenoid valve to
the MIG to r ch adapto r may be f r actu r ed
o r disconnected f r om the MIG to r ch
adapto r . Retu r n to an Acc r edited The r mal
A r c Se r vice Agent fo r r epai r .
4. Welding in a windy
envi
r onment
a. Shield the weld a r ea f r om the wind o r
inc r ease the gas flow
5. Welding di r ty, oily,
painted, oxidized o r
g r easy plate.
a. Clean contaminates off the plate
6. Distance between the
MIG to
r ch nozzle and
the wo r k piece.
a. Keep the distance between the MIG
to
r ch nozzle and the wo r k piece to a
minimum.
7. Maintain the MIG
to
r ch in good wo r king
o r de r .
a. Ensu r e that the gas holes a r e not
blocked and gas is exiting out of the
to
r ch nozzle. Refe r to WARNING below
b. Do not r est r ict gas flow by allowing
spatte r to build up inside the MIG to r ch
nozzle.
C. Check that the MIG gun O-
r ings a r e
not damaged.
Po r osity
Table 6-1: Po r osity P r oblems
WARNING
Disengage the d r ive r oll when testing fo r gas flow by ea r .