UNSPSC 31351700: Sonic welded tube assemblies

UNSPSC 31351700 Sonic welded tube assemblies, a Class code, encompasses steel fabrication services that state and local governments procure for protective and structural infrastructure—custom doors, cages, anti-vandalism boxes and covers, handrails, and specialized protective works. The work involves metal fabrication, machining, metal finishing, mobile welding, and emergency welding across steel, galvanized steel, stainless steel, aluminum, and coated materials. City facilities and maintenance departments are the primary buyers under this code, tasking vendors with both shop-based fabrication and on-site welding to address asset protection, vandalism mitigation, and safety infrastructure needs.

Arizona shows current activity under the code. The City of Tucson issued RFP No. 240080 in March 2026 for steel fabrication services to support its Facilities and Communications Maintenance department, with a pre-submittal virtual meeting held in November 2023 and proposals due November 30, 2023, at 2:00 P.M. local time. The contract carries a one-year initial term with options to extend for up to four additional one-year periods. Vendors must meet Section 3 Program requirements (25 percent of total labor hours by Section 3 Workers, with 5 percent by Targeted Section 3 Workers), DBE participation mandates, Buy America provisions, and civil rights compliance tied to federal housing and transit funding. Typical project completion timelines run six weeks from approval, with most work performed at the contractor's fabrication shop.