What Is Sanitary Welding?
Sanitary welding is TIG (GTAW) work on stainless tubing where the inside of the joint matters as much as the outside. A good sanitary weld is fully fused, has no sugaring or heat tint past a light straw color, and leaves an ID that wipes down as clean as the rest of the pipe. A bad one traps product, grows biofilm, and shows up on the next swab test.
We're Sanitary Welding Solutions LLC, based in Dade City, Florida. We install, modify, and repair sanitary process piping for food, dairy, brewery, pharmaceutical, and biotech plants. Most of our work is 304L or 316L tube from 1/2" up to 6", though we get into larger vessel work too. Every joint gets a continuous argon purge with the root side held under 50 PPM O₂ before the arc strikes.
Where Sanitary Welds Are Required
- Food and beverage process lines, CIP and SIP loops
- Dairy transfer piping and 3-A regulated equipment
- Brewery, distillery, and winery product piping
- Pharmaceutical, biotech, and WFI (Water for Injection) systems
- Cleanroom utilities and high-purity gas
- Cosmetics, nutraceutical, and supplement plants
How We Run a Joint
From the outside, a sanitary weld looks the same whether the purge was right or not. Inside is a different story. Here's the procedure our welders run on every fit-up:
- Square-cut and deburr the tube on a tubing cutter, no grinder marks on the bevel.
- Dam off the section and purge with argon until the meter reads under 50 PPM O₂ at the root.
- Manual TIG, autogenous on most tube-to-tube joints, with heat input dialed in for the wall thickness (typically 0.065" on 2" tube).
- Borescope the ID joint by joint and re-do anything with sugaring, concavity past spec, or misalignment.
- Weld map, weld log, welder ID, and heat numbers go in the QA packet at turnover.
Recent Work
A few of the jobs we've run lately:
- Tied 180 ft of new 2" 316L sanitary tube into a Central Florida creamery's pasteurizer skid during a 36-hour weekend shutdown. 47 joints, all borescoped, plant ran Monday morning.
- Replaced a corroded section of CIP return on a snack plant in Georgia. Found the original installer had used 304 fittings on a caustic line. Re-piped in 316L and walked the QA team through the weld log.
- Fabricated and installed a tri-clamp manifold for a craft brewery's whirlpool inlet. Six valves, twelve tri-clamp connections, swung it on a Tuesday afternoon between brews.