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Welding technology

Welding supervision is carried out by a qualified Welding Engineers. High quality of welded joints is achieved by:

  • high qualifications of our welding personnel
    • 130 workers hold the following qualifications: 135PBW3.2St12PF/PCssnb and 135PFW3.2St12PDml as per DIN EN 287-1,
    • our welders are trained at our in-house welding centre which has suitable qualifications,

  • utilisation of appropriate welding techniques confirmed by the certificates of
    • Grosser Eignungsachweis welding qualifications as per DIN 18800-7 issued by SLV Halle for welding of S355, S690 and S960 steels,
    • welding qualifications as per EN ISO 3834-2 issued by DVS ZERT for welding of steel construction, machinery construction, cranes and rail vehicles,
    • qualifications for manufacture of welded fabrications used for shipbuilding and erection of drilling platforms issued by DNV,

  • inspections of welding equipment
    • as per Quality Management System procedure complying with the requirements of ISO 9001:2008.


According to the acquired certificates the company is approved for the following WPQR's.

Item Material Type of joint / welding position Material thickness Approval by
1. S355J2+N (1.2) FW / PB

t1=3÷6

t2=6÷14

GSI SLV
2. S355J2+N (1.2) FW / PB;PF t≥5 GSI SLV
3. S355J2+N (1.2) FW / PF

t1=3÷6

t2=6÷14

GSI SLV
4. S500MC (2.1) BW / PA t=7,5÷30 GSI SLV
5. S960QL (3.2) BW; FW / PC(BW); PB(FW) IS
6. S690QL + S960QL BW / PA; PC t=3÷24 IS
7. S355J2+N  (1.2) BW / PC t=10÷40 DNV
8. S355J2+N  (1.2)  BW / PF t=10÷40 DNV
9. S355J2H (1.2) BW / PC t=3÷20 DNV
10. S355J2H (1.2) BW / PF t=3÷20 DNV
11. S355J2H (1.2) BW / PC; PF t=3÷20 DNV
12.

S355J2G3 (1.2)

BW / PA t=7,5÷30 DNV
13. S355J2G3 (1.2) BW / PF t=10÷40 DNV
14. S355J2G3 (1.2) BW / PF t=18÷70 DNV
15. S960QL (3.2) BW / PA t=12,5÷50 SLV
16. S960QL (3.2) BW / PA t=12,5÷50 SLV
17. S355J2+N (1.2) FW / PF; PD t=5÷20 SLV
18. S355J2+N (1.2) FW / PF; PD t≥5 SLV
19. S355J2+N (1.2) BW / PF; PC t=3÷24 SLV
20. S355J2+N (1.2) BW / PF; PC t=50÷100 SLV
21. S690QL (3.1) BW / PC t=7,5÷40 SLV
22. S690QL + S960QL BW / PC t=7,5÷40 SLV
23. S355J2+N (1.2) BW / PA t=7,5÷30 SLV
24. S355J2+N (1.2) BW + FW / PC(BW); PB(FW)

t=40÷160(BW); t≥5 (FW) / PC(BW); PB(FW)

SLV
25. S355J2+N (1.2) FW / PB t=6÷24 SLV
26. S355J2+N (1.2) FW / PB t≥5 SLV
27. S355J2+N (1.2) BW / PA t=3÷24 SLV
28. S690QL (3.1) BW / PA t=3÷24 SLV
29. S690QL (3.1) BW / PC

t1=13÷20

t2=15÷60

SLV
30. S690QL (3.1) FW / PB t=5÷20 SLV
31. S690QL (3.1) FW / PB t≥5 SLV
32. S355J2+N (1.2) BW / PA t=7,5÷30 SLV
33. S355J2+N (1.2) BW / PC t=7,5÷30 SLV
34. S355J2+N (1.2) FW / PB; PF t≥5 SLV
35. S355J2+N (1.2) FW / PB; PF t=5÷20 SLV
36. S960QL (3.2) BW / PA t=3÷24 SLV
37. S960QL (3.2) FW / PB

t=5÷20

SLV
38. S960QL (3.2) FW / PB t≥5 SLV
39. S960QL (3.2) BW / PC

t1=3÷20

t2=3÷20

SLV