Custom welded assemblies and structures — manufactured according to customer drawings from steel rolled products (sheet, profile, pipe). Welding technologies: MIG/MAG (semi-automatic in CO₂ or Ar+CO₂ mixture), TIG (argon arc — for stainless steel and aluminum), MMA (manual metal arc — for installation work), SAW (submerged arc — for thick seams). Weld seam control: visual (VT), ultrasonic (UT), radiographic (RT), magnetic particle (MT). Welder qualifications: NAKS, EN ISO 9606. Anti-corrosion treatment after welding: shot blasting + primer/painting or hot-dip galvanizing. NDT (non-destructive testing) of welds: UT — for butt welds of critical structures. MT — for fillet welds and lap joints. RT — for high-pressure pipelines and boiler equipment. Documentation: NDT report, NAKS welder certificate, WPS/PQR. Russian-made products, compliant.