Hobart Welding Products HSW 25 - Manual (Page 12)

OM-715 Page 8 Return To Table Of Contents
4-3. Adjusting Tong And Hand Lever Pressure
Y Turn off and unplug welder.
Y Excessive tong pressure can dam-
age tips. Do not use tongs as a clamp
or vice to hold workpiece together. If
the two pieces of material to be
welded do not make good contact at
the point of the intended weld, clamp
material to provide good contact be-
tween surfaces.
.
Tong pressure is adjustable, and must
be checked and/or set before operation.
Correct tong pressure is necessary to
create a quality weld and to prevent
damage to tips.
Too much tong pressure causes the
weld nugget to dimple and material to
splash out around the nugget area.
If tong pressure is too weak, parts are
loose when the tongs close, severe arc-
ing occurs between workpieces, and no
weld can be made.
1 Front Nut
2 Rear Nut
3 Pivot Casting
4 Hand Lever
5 Tongs
To increase tong pressure, loosen front nut.
The farther the front nut is turned out, the
greater the pressure on the tips when the
hand lever is closed. Turn the rear nut up to
the pivot casting to lock the position.
To decrease tong pressure, loosen the rear
nut and turn the front nut up to the pivot cast-
ing.
6 Machine Screw
The farther down the screw is turned, the far-
ther the hand lever will close. Adjustment of
this screw will determine if the tongs lock on
the material, or just pull up tight. Adjust screw
to allow lever to be raised easily after the
weld has been completed.
7 Hex Nut
To adjust pressure needed to push down
hand lever, turn the hex nuts located on each
side of the pivot casting.
Tools Needed:
1
2
3
4
5
6
7
Ref. ST-800 156
9/16, 11/16 in