36779 - ESAB MT-250 SG 200A Spool Gun with 25ft Cable

Precision Aluminum Welding Solution

The ESAB MT-250 SG MIG Spool Gun (Part Number 36779) is a specialized welding accessory engineered to solve the inherent challenges of feeding soft welding wires, such as aluminum, over long distances. Designed specifically for use with the Migmaster Compact series of power sources, this spool gun integrates a wire feed mechanism directly into the handle, effectively isolating the wire path to a few inches rather than pushing it through a long cable liner. This design eliminates the friction and buckling issues—commonly known as "bird-nesting"—that plague standard MIG guns when welding aluminum.

Technically, the MT-250 SG is built around a powerful, heavy-duty gear motor located within the molded gun case. This motor provides consistent torque to pull wire from the onboard 4-inch diameter spool, ensuring a stable arc and uniform bead appearance. The unit is rated for 200 Amps, making it suitable for a wide range of fabrication tasks, from light gauge sheet metal to medium structural components. A key feature for industrial operators is the two-stage trigger mechanism. Partial depression of the trigger activates the gas pre-flow, allowing the shielding gas to purge the weld zone before the arc is struck. Full depression engages the wire feed and welding current. This functionality is critical for preventing porosity at the start of aluminum welds.

The ergonomic layout includes a wire feed speed control potentiometer mounted directly on the gun body. This allows the operator to fine-tune parameters at the workpiece without returning to the power source, significantly increasing efficiency when working with the extended 25-foot service lines. The spool holder itself is adjustable, allowing the welder to shift the center of gravity to match their hand position, thereby reducing fatigue during prolonged operation. Weighing in at less than 3 lbs, the gun body is exceptionally maneuverable, making it an ideal choice for out-of-position welding and complex assemblies.

Maintenance and consumables management are streamlined through the use of standard MT contact tips and nozzles, which are known for their durability and heat resistance. The 25-foot cable assembly provides ample reach for working on large projects, such as boat hulls, trailers, or large tanks, where moving the power source is impractical.