D/F Water-Cooled Semi-Automatic MIG Hand-Held Pistol Grip Gun Model NC-21/HT-21 - Push MIG Gun

With more than 44 years of aluminum and steel trailer welding, D/F Machine Specialties Water-Cooled Semi Automatic "MIG" Pistol Grip Gun Model NC-21/HT-21 has been push welding aluminum trailers.

Remember the Great Linde ST-5 Torch (part no. 46V34) that was used exclusively for gas metal arc (MIG) spot welding of aluminum and hard wires? Very similar in design to the Linde ST-5 and ESAB ST-21 but with improvements and new features, and proven to be a superior replacement alternative, the D/F Water-Cooled handheld pistol grip "MIG" push gun is a rugged all purpose, water-cooled, manual "MIG" welding torch designed to operate at welding currents up to 600 amperes continuous duty using all types of shielding gases. The torch utilizes a pistol grip design for convenient start-stop welding control and easy handling, and its in-line type construction allows all service lines to enter through the torch barrel. The DF Pistol is intended for use with all wire feeders which have provision for water cooling and will handle all types of welding wires from .035" diameter through 1/8" diameter including flux cored wire, 3/64" AL through 3/32" Aluminum wire.

Push Gun Benefits
Feeding aluminum wire through a push only system is very advantageous. The D/F Pistol is inexpensive unlike the push-pull MIG torches ans spool guns on the market today. Push-pull torches are also very fragile, difficult to maintain, and have more parts. A push gun requires u-groove drive rolls to provide more surface contact with the wire, a Teflon liner, and adequate drive-roll pressure. With the use of the D/F steel reinforced casing supporting the liner, the D/F Pistol Gun can push 3/64", 1/16", and 3/32" aluminum wire up to 15 feet. Because the D/F Pistol Gun can hook up to any manufacturer's wire feeder and power source, large spools of wire can be used reducing expenses, down time, and wear and tear on the torch by the changing of spools, as in a spool gun. A spool gun needs to have the roll changed after every pound of wire is used, compared with the 8- or 15 lb spool on a push-pull system. In tight spaces, the spool may limit access, requiring the operator to use a longer stickout. If the operator is using several pounds of aluminum per day, the few minutes need to change spools can add up. Also, the chance of burnback exists when the end of a spool is reached, so many operators stop when a few turns are left on the spool.

Spool Gun Limitations
Because a spool gun is larger than a push gun, it can sometimes be difficult to get close access to the weld. Also, a spool gun can only hold a 1 pound spool of aluminum wire electrode, so changeovers are frequent. In addition, these small spools typically are not the most economical way to purchase wire.

Push-Pull Gun Limitations
Typically, the greatest disadvantage of a push-pull system is that it requires the most number of components and is the most expensive. Push-pull guns are also very fragile and do not last as long.

To provide maximum resistance to the abuses of day to day service, the pistol grip torch is of heavy duty construction with all metal parts well insulated from current carrying members. The in-line body and pistol grip handle allow the D/F Pistol to be used in a variety of applications with easy maneuverability and comfortable operation. To facilitate maneuverability, all service lines are internally connected to the torch body and exit from the rear of the torch barrel. The torch can use either threaded contact tips or slip-in contact tubes which are secured with a collet nut supplied with the torch. The contact tip can be quickly and easily replaced by unscrewing the metal nozzle and collet nut, and removing the tip. Six water-cooled metal nozzles with different lengths and different I.D./O.D. are available for use with the D/F Pistol for continuous fusion welding and for spot welding applications. The water-cooling requirements for the D/F Pistol are described below.

Each D/F gun is fully assembled and ready to install. In order to make the installation complete, the code number, wire size, make/model (Lincoln wire feeders, Miller wire feeders, ESAB wire feeders, & EURO Quick-Disconnect wire feeders), and inlet as needed must be specified when ordering. If special welding tools or accessories other than those listed previously are required, please consult with the factory. Get the Right Feeder Adapter Connection to Fit Your "MIG" Wire Feeder.