Welding at První železářská společnost Kladno

První železářská společnost Kladno, s.r.o. is certified for ensuring Standard quality requirements for fusion welding of metals according to EN 729-3.According to ČSN 73 2601, amendment Z2:1994, PŽSK is capable of manufacturing steel structures (production classes A and B) in the scope of first capability grade according to Art. 203 – Full Capability Certificate.

Steel structures

and pressure vessel are welded according to certified welding procedures, using the following welding methods according to ČSN ISO 857:

  • 111 ( MMA) manual metal arc welding
  • 114 (FCAW) flux-cored arc welding
  • 121 ( SAW) submerged arc welding
  • 131 (MIG) metal inert gas welding
  • 135 (MAG) metal active gas welding (melting electrode)
  • 136 (MAG) metal active gas welding (tubular core electrode)
  • 141 (TIG) Tungsten Inert Gas welding
  • 15 plasma arc welding
  • 311 (GW) Oxy-Acetylene Welding

Welding sources and equipment:

  • Welding automat ESAB (121) Column 3000×3000 mm, source 800 A, SAW, MIG, MAG
  • Welding sources MIG/ MAG (135,136) 250 ÷ 500 A , traditional and pulse sources
  • Welding sources TIG (141) 250 ÷350 A
  • Welding sources MMA (111) 300 A
  • Spot welding machine

Our welders are certified according to EN 287-1 (Testing of welders: Fusion welding. Part 1: Steels). Their qualification is tested regularly and improved according to the company’s requirements. Non-destructive testing of weld seams prove good quality of our welders and welding procedures. Our company applies its own range of certified welding procedures approved by a notified body according to ČSN EN ISO 15614-1 (former ČSN EN 288 -3) (WPQR/ WPS). It is also has all necessary qualifications for production of pressure vessels according to the directive 97/23/ES (Annex 1, Art 3.1.2)

We have a long-term experience with and own certified procedures for welding of the following base materials (classification according to CR ISO 15608):

  • 1.1, 1.2, 1.3 (non-alloyed machine steels)
  • 2 (thermomechanically processed fine-grained steels with a yield point up to 690 MPa, incl. high-strength and wear-resistant materials, such as HARDOX, WELDOX, DOMEX, ALFORM etc.)
  • 3 (heat-treated and maraging steels)
  • 8 (austenitic stainless steels, incl. combined joints SS + St)
  • 31 (pure Cu and Cu alloys, combined joints Cu+SS, Cu+St)