17
and tune in the wire speed as if you were welding the same thickness material with a continuous
bead.
6.6 Spot welding instructions
1. Select the wire diameter and heat setting recommended above for the method of spot welding you
intend to use.
2. Tune in the wire speed as if you were going to make a continuous weld.
3. Hold the torch nozzle completely perpendicular to and about 6 mm off the work piece.
4. Pull the trigger on the torch and release it when it appears that the desired penetration has been
achieved.
5. Make practice spot welds on scrap metal, varying the length of time you holding the trigger, until a
desired spot weld is achieved.
6. Make spot welds on the actual work piece at desired locations.
7. Electrode
The welding electrode is a rod coated with a layer of flux. When welding, electrical current flows
between the electrode (rod) and the grounded metal workpiece. The intense heat of the arc between
the rod and the grounded metal melts the electrode and the flux.
8. Selecting the proper electrode
There is no golden rule to determine the exact electrode or heat setting required for every particular
situation. The type and thickness of metal and the position of the workpiece rule the electrode type and
the amount of heat needed during welding process. Heavier and thicker metals require more
amperage. It is best to practice your welds on scrap metal which matches the metal you intend to work
with, in order to define correct heat setting as well as make appropriate electrode choice. Please
observe some following helpful troubleshooting tips to determine if you are using a correct electrode.
1.
When electrode of proper size is used
a. The bead will lay smoothly over the workpiece
without ragged edges.
b. The base metal puddle will be as deep as the bead
that rises above it.
c. The welding operation will make a crackling sound
similar to the sound of eggs frying.
2.
When too thin electrode is used
a. The weld bead will be too high and irregular
b. The arc will be difficult to maintain
3.
When too thick electrode is used
a. The arc will burn through thin metals
b. Occurrence of the weld bead undercutting
c. The bead will be flat and porous
d. Rod might get freezed or sticked to the workpiece
Note: Rate of travel over the workpiece also affects the weld. To ensure proper penetration and enough
rod deposit, the arc must be moved slowly and evenly along the weld seam.
Содержание MIG 180-5
Страница 20: ...22 C Lift the welding torch to the normal position to initiate the arc and start welding ...
Страница 22: ...24 Spare parts listing ...
Страница 49: ...51 Κατάλογος ανταλλακτικών ...
Страница 74: ...76 Sklopni crtež rezervnih delova ...
Страница 99: ...101 Sklopni crtež rezervnih delova ...
Страница 127: ...129 Skica notranjosti naprave ...