11-45 - 11-45 Contact Tip .045 for Tweco #1 & Magnum 100L

Precision Engineered 11-45 Contact Tip for MIG Welding

The Tweco Style 11-45 Contact Tip is a critical consumable component designed to ensure optimal electrical conductivity and wire guidance in MIG welding operations. Engineered to meet the rigorous demands of light to medium-duty fabrication, this contact tip is compatible with the widely used Tweco No. 1 Series MIG guns, as well as the Lincoln Magnum 100L and Weldskill series (140A, 180A, 220A). It serves as the final point of electrical transfer to the electrode wire, making its material composition and dimensional accuracy paramount for arc stability.

Manufactured from a premium copper alloy tubing, this contact tip offers superior thermal and electrical properties compared to standard copper tips. The alloy is specifically selected to resist the high heat generated during the welding process (up to 200 amperes), reducing the rate of bore erosion and keyholing. A consistent inside diameter is maintained through precision machining, with tolerances held strictly to +/- .003 inches. This tight tolerance is essential for maintaining a stable electrical contact point with the .045" (1.2mm) wire, preventing micro-arcing inside the tip which can lead to premature failure and erratic arc characteristics.

The 11-45 tip features a standard threaded base designed to mate perfectly with the 35-50 gas diffuser. This secure mechanical connection ensures efficient gas coverage and current transfer from the diffuser to the tip. The exterior is marked clearly with the part number and wire diameter, facilitating quick identification in a busy workshop environment. Whether utilized in automotive repair, general fabrication, or maintenance applications, this contact tip provides the reliability required for consistent weld bead profiles and reduced downtime associated with consumable changeovers.

Proper maintenance of the contact tip is vital for system performance. Users should regularly inspect the tip for spatter buildup and bore wear. The 11-45's robust construction allows for extended service life, but timely replacement is recommended when the exit hole becomes oval-shaped or obstructed, ensuring that the welding parameters remain within specification.