Tri-Arc carries a large inventory of packaged and liquid gases. Our most commonly requested gases include: acetylene, oxygen, carbon dioxide, nitrogen, helium, argon/carbon dioxide mixtures, argon/helium mixtures, hydrogen, propane, propylene, nitrous oxide, nitrogen/carbon dioxide mixtures, and more. We offer ultra-high pure gases for lab and packaging application with certificates of analysis available upon request.

You’ll find our gases at work in welding and  fabricating shops, taverns, restaurants, and breweries, laboratories, auto body repair and mechanic shops, party supply stores, packaging plants, manufacturing firms, medical offices, speed shops,  lumber mills, refineries, home garages..just to name a few.

Our packaged gases are available for delivery in Western Montana. Please call 549-2003 (Missoula)  to schedule a gas delivery.


Filler Metals

MIG, TIG, Stick products? Yeah, we got that. Need some aluminum brazing rod? No problem. Tri-Arc stocks a full line of filler metals from .023 solid welding wire and your standard 7018 electrodes, to hard to find filler metals for copper and stainless steel applications. You can pick up what you need at our store in Missoula we can deliver your product to your shop, or send it via common carrier.



Tri-Arc knows welding. And we know how important abrasives are in contributing to productivity and your bottom line. Our warehouse is stocked with over 40,000 abrasives and our prices are nationally competitive. Whether you need a single 4 inch cut-off wheel or 1,000 surface conditioning discs, we have what you need. We buy quality products factory direct and pass the savings on to our customers.


Leathers, Gloves, and Industrial Clothing Apparel

Our inventory of Revco and Black Stallion products are as durable and tough as our customers. We have full welding leathers, FR jackets, hybrid jackets, leather bibs, welding spats, Kevlar sleeves, FR sleeves, leather aprons, sheepskin headbands, and all the other gear that makes you go. Our glove selection is huge and our inventory is equipped to supply any need. And, you can trust that we accept returns for any manufacturing defect…no hassle, no haggling.


Plasma Cutters and Consumables

Our Thermal Dynamics plasma cutters are tried and true and backed up with some of the best warranties in the industry. Whether you need a Cutmaster 42 for your home garage or auto body business, or a Cutmaster 152 for your growing industrial business, Tri-Arc can help you select the right machine for your application and keep your purchase within budget. You can rest assured that Tri-Arc will always be at the forefront of plasma technology as it continues to advance. Trying to find parts and consumables for your Miller, Hypertherm, ESAB, or other brand plasma machine? No problem, we stock the most common tips, electrodes, swirl rings, retaining cups and there’s a good chance we have the hard-to-find parts sitting in our warehouse in Missoula.


Welders and Consumables

Whether you’re interested in one of Thermal Arc’s new 3n1 series machines, or you need the biggest engine drive welder in the industry- our service and pricing is second to none. Tri-Arc stocks consumables such as liners, tips, nozzles, and diffusers for all major brands and our turnaround time for back orders is exceptionally fast. We can build welding leads while you wait or have them ready in advance for pickup or delivery. Our welders and consumables have been sold to customers as far away as Dutch Harbor, Alaska right down to our neighbors on Commerce Street in Missoula.