Wire Feed Arc Welder
Assembly (Continued)
POLARITY
MIG welding wire requires the electrode to be positive.
Flux welding wire requires the electrode to be negative. Always use the polarity recommended by the welding wire manufacturer. The welder is factory set for flux welding wire.
To Change Polarity (See Figure 6)
1.Unplug power cord from socket.
2.Open wire feed compartment door.
3.Remove two nuts from polarity studs.
4.Connect cable from drive deck to positive stud and cable from work clamp to negative stud for electrode positive polarity for MIG welding. Connect cable from drive deck to negative stud and cable from work clamp to positive stud for electrode negative polarity for flux core welding.
5.Reinstall two nuts and tighten securely.
If the nuts are
not tightened properly, excessive heat will be generated by the loose connection and the insulators on the studs will be damaged.
Shielding Gas Preparation
Improper handling
and maintenance of compressed gas cylinders and regulators can result in serious injury or death! Always secure gas cylinders to a wall or other fixed support to prevent cylinder from falling over. Read, understand and follow all compressed gas and equipment warnings in the safety instructions.
NOTE: Shielding gas is not required if
GAS TYPES
There are 3 types of gas generally used for gas metal arc welding; 100% argon, a mixture of 75% argon and 25% carbon dioxide (C25) or 100% carbon dioxide.
Use ONLY the type of gas recommended for your welder. Use ONLY an inert, non- flammable type of gas. Failure to do so will result in a very hazardous situation.
The 75/25 mixture is recommended for general steel welding. For aluminum welding, use 100% argon. Cylinders of either type gas may be obtained at your local welding supply outlet. Secure cylinder to prevent it from falling over.
Obtaining Correct Gas Type. The gas used in any welding application for your welder must be an INERT, NON- FLAMMABLE TYPE. You can get the type of gas needed from a nearby welding gas distributor (often found in the yellow pages under “Welders” or “Welding Equipment”).
REGULATOR
An adjustable regulator with two gauges is supplied with the WG3090 and WG4130. The WG3080 is not supplied with a regulator (see parts list for optional regulator/hose kit). The regulator provides a constant shielding gas pressure and flow rate during the welding process. Each regulator is designed to be used with a specific gas or mixture of gases. The argon and argon mixture use the same thread type. The 100% carbon dioxide uses a different thread type. An adapter is available at your local welding gas supplier to change between the two.
HOSE AND REGULATOR HOOKUP PROCEDURE
Cylinder gas is
under high pressure. Point cylinder outlet away from yourself and any bystanders before opening.
1. With cylinder securely supported, |
stand on side of cylinder opposite |
cylinder outlet then remove cylinder |
NOTE: Electrode negative polarity (typical for flux core welding) shown in figure.
Reverse cables for electrode positive polarity (typical for MIG welding).
Ground cable
Drive deck cable
Positive stud
Negative stud
Brass nuts
Figure 6 - Polarity control
cap and open valve slightly by |
turning counterclockwise. When gas is |
emitted from cylinder, close valve by |
turning clockwise. This will blow out |
dust or dirt that may have |
accumulated around valve seat. |
2. Install regulator onto cylinder valve. |
Tighten stem nut securely to gas |
valve. |
3. Install one end of gas hose to fitting |
on the back of welder and other end |
of hose to fitting on regulator. Make |
sure gas hose is not kinked or twisted. |
4. While standing opposite cylinder |
outlet, slowly open cylinder valve. |
Inspect for leaks in the connections. |
5. Turn unit on and pull trigger on |
torch to allow gas to flow. Adjust gas |
regulator to between 20 and 40 CFH. |
Release trigger and turn unit off. |
6. Remember to close gas cylinder valve |
when finished welding. |
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