HTP MTS 160, Owner'S Manual

Page: 17 / 28

Figures 11 and 12 show what will happen to the swan neck
if you do not keep your nozzle clean. Both figures illustrate
that in extreme cases, shorting out the nozzle will burn holes
completely through the swan neck requiring its replacement.
In Figure 11 is a deformed nozzle spring pointing outward, so it
will come in contact with the inside of the gas nozzle. In Figure
12, the nozzle spring is wound down around the base of the
swan neck. These deformed springs are caused by improper
removal of the gas nozzle. This again will cause the welding
current to be transmitted to the exterior of the gas nozzle, once
again causing a short circuit. THE NOZZLE CAN ONLY BE
REMOVED BY TWISTING IN A CLOCKWISE DIRECTION
WHILE PULLING IT OFF.
Figure 9
Spatter Build Up Symptoms
Figure 10
Spatter Build Up
Figure 11
Spatter Damaged Swan Neck
Figure 12
Spatter Damaged Swan Neck
Figure 16 shows the effect of a wire drive mechanism that has
been set just a little bit too tight. As you can see, the wire has
been spiraled into the liner, resulting in the curvy wire. When
the wire got to the contact tip, it could not pass through the
contact tip smoothly, hence burning back to the tip. Since the
wire could not pass through the tip, this same situation
(spiraling wire) has now occurred at the other end of the
welding gun. When it passes 10 feet through the welding gun,
the wire will not be able to pass through the tip smoothly. If
resetting the tension on the drive roller does not remedy this
problem, then the liner should be replaced.
CHANGING THE CONTACT TIP
The contact tip should be regarded as a wearing part and
therefore requires periodic replacement. Since steel wire is
passing through a copper tip, the wire will have a tendency to
wear away the copper tip, causing it to become oblong or
excessively oversized. This one-inch piece of copper is all that
is taking the welding amperage and transferring it to the
welding wire. Therefore, an excessively worn tip will cause
poor electrical contact between the wire and the tip, resulting in
a welder that will not weld smoothly.
To remove the contact tip, clip off the burnt wire at the end of
the welding gun. Unscrew the contact tip. Install the new tip by
feeding the wire through the hole in the center of the tip and
screw the tip into the swan neck.
Part # Fits Wire Size
15023B .023" 0.6 mm
15030B .030" 0.8 mm
15035B .035" 0.9 mm
15040B .040" 1.0 mm
15045B .045" 1.2 mm
CHANGING THE GAS NOZZLE
The gas nozzle is removed by simultaneously twisting the gas
nozzle and pulling it off. The gas nozzle can only be twisted in
a clockwise direction. Twisting the nozzle in a counter-
clockwise direction will damage the nozzle spring. To install
the gas nozzle, simply twist the nozzle in the same clockwise
direction while pushing it on the swan neck. The following gas
nozzles are available for your welding gun:
Part # Description Application
15105B Conical Nozzle General Welding
15004B Cylindrical Nozzle Aluminum Welding
15106B Spot Weld Nozzle Spot Welding
15108B Small Conical Nozzle Corner Welding
17
Figure 16