How to Convert Your Welding Torch with a Conversion Kit

By MIG/TIG/Stick Welders & Plasma Cutters | USA Weld – HTP ... | Published: 2026-10-25

Category: How-to Guides

Learn how to convert your Hobart or Miller MIG welding gun using a conversion kit. Follow this step-by-step guide to install new contact tips, adapter, and nozzle.

Quick answer

Install a conversion kit to replace the discontinued nozzle assembly on your Hobart or Miller MIG gun, keeping the tool in service until the liner needs replacement.

Why a conversion kit is needed

The original nozzle, nozzle adapter, and liner for Hobart Piecemaker 14A and Miller 10A MIG guns have been discontinued. Without a conversion kit, you cannot replace worn-out contact tips or use the gun with different wire diameters. The kit provides a new tip adapter, nozzle, and a 10-pack of contact tips, restoring full functionality.

Choosing the correct contact tip size

The conversion kit lets you select contact tips based on the wire diameter you use. Common sizes include 0.030, 0.035, and 0.045 inches. Using the wrong size can cause poor arc stability or excessive spatter. Check your welding wire packaging to confirm the diameter before ordering.

Step-by-step conversion guide

1. Disconnect power and remove old nozzle assembly: Unplug the welder and let it cool. Unscrew the original nozzle, nozzle adapter, and liner. Discard the old parts. Do not reuse the old liner if it is worn—this kit only replaces the nozzle and adapter, not the liner.
2. Install the new nozzle adapter: Screw the new nozzle adapter into the gun body hand-tight. Use a wrench to snug it, but avoid overtightening to prevent thread damage. Apply anti-seize compound to the threads if the gun is used in a high-heat environment.
3. Attach the new nozzle: Thread the new nozzle onto the adapter. Ensure it seats fully against the adapter shoulder. A loose nozzle can cause gas leakage and poor weld quality.
4. Insert the correct contact tip: Pick the contact tip that matches your wire diameter. Push it into the nozzle until it clicks or seats firmly. Install the remaining tips as spares. Using a tip that is too large can cause the wire to stick; too small leads to erratic arc starts.
5. Reconnect power and test: Plug in the welder, set a low wire feed speed, and run a test bead on scrap metal. Check for stable arc and consistent wire burn-off. If the arc is unstable, re-check the contact tip size and nozzle tightness before adjusting wire speed.

Product facts

Conversion Kit: Conversion kit for Hobart Piecemaker 14A and Miller 10A MIG guns includes a 10-pack of contact tips (your choice of size), a tip adapter, and a nozzle. You can continue using your OEM gun after the original nozzle parts were discontinued, as long as the liner is still serviceable.
Conversion Kit