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(623) 582-8828 Mon - Fri 6:30am - 4:30pm 22424 N 19th Ave, Phoenix, AZ 85027
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(520) 378-4344 Mon - Fri 7:00am - 4:00pm 80 N Lenzner Ave, Sierra Vista, AZ 85635
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This Phoenix Welding Supply FAQ gives quick answers for Arizona customers. Find help with cylinders, beverage CO2, beer mix gas, delivery, equipment repair, hydrostatic testing, account forms, and SDS. If you do not see your question, please contact our team.

Frequently Asked Questions

What size cylinder do I have?

See our cylinder size chart image on this page. You can also bring a cylinder to your nearest branch for help with identification.

What cylinder sizes do you offer?

We carry common sizes for beverage and lab use including twenty pound and fifty pound CO2 and two hundred cubic foot helium and nitrogen.

How do I open and close the cylinder valve?

Turn the valve counter clockwise to open. Turn the valve clockwise to close. Open the valve slowly and follow all safety guidance on the label.

What fitting is on a CO2 cylinder?

Most CO2 cylinders use a CGA three two zero valve with male threads and a flat sealing surface that requires a CO2 washer.

How do I check for a leak in my CO2 system?

Close the cylinder. Mark the gauge needles. Wait two minutes. Open the cylinder and compare the needles. If the needles moved, spray fittings with a mild soap and water solution and look for bubbles.

My CO2 gauge looks low right after a delivery?

CO2 is filled by weight. Right after filling, the pressure can read near five hundred psi. At about seventy degrees a full cylinder reads about eight hundred psi.

What is beer mix gas?

Beer mix gas is a blend of nitrogen and CO2. A common blend is seventy five percent nitrogen and twenty five percent CO2. This blend is often used for import and craft beer and for long draw systems to reduce foam.

What regulator pressure should I use for beer or soda?

Please contact your beverage supplier for exact settings. Most suppliers publish their own recommendations for their systems.

Do you repair welding equipment?

Yes. Certified technicians service major brands of welders, plasma cutters, engine driven units, and wire feeders at our Phoenix location.

Do you offer hydrostatic testing?

Yes. We provide hydrostatic testing to keep high pressure cylinders safe and compliant. Ask your local branch for scheduling.

Where can I find branch locations?

See our locations for Phoenix, Mesa, Deer Valley, Tucson, Flagstaff, and Sierra Vista. Each branch page includes address and phone.

How do I set up an account or apply for credit?

Visit Document Resources to download the credit application or the cash account form. You can also find a credit card authorization form.

Where can I download Safety Data Sheets?

Visit our MSDS page to download SDS for acetylene, argon, carbon dioxide, helium, hydrogen, nitrogen, oxygen, propane, and common blends.

Can I shop online?

Yes. You can browse and buy selected welding supplies in our online store. If you do not see your brand, contact us.

I hear a popping sound near the syrup boxes?

The carbonator clicks when it tries to fill. Replace an empty syrup box and the clicking should stop.

My regulator needle is near the red arc. Am I out of product?

Not yet. Monitor the gauge and switch to your spare cylinder when it nears the end of the red arc.