WELDING

Additional information Head Welding Engineer V.A. Belinsky phone.:+38 (0626) 47-88-64
E-mail:bmogs@nkmz.donetsk.ua
Head of welding department design office B.A. Zolotopupov phone.:+38 (0626) 47-80-04
E-mail:zba@nkmz.donetsk.ua

 

 Welding fabrication of NKMZ features high mobility and unique engineering capabilities for products making to suit any orders for metallurgical, steel melting, rolling-mill, hoisting, blast furnace and other productions assuring thus observance of requirements in conformity with DIN, EN, ISO standards.

     

Engineering staff is certified in accordance with the following norms and rules:

  •   0.00-1.07-94 Rules for Design and Safe Operation of Pressure Vessels;
  •   0.00-1.08-94 Regulations for Arrangements and Safe Operation of Industrial Boilers;
  •   0.00-1.01-07 Procedure for Design and Safe Operation of Cargo Cranes;
  •   3.05.03-85 Construction Code and Regulations. Heating lines;
  •   3.05.04-85 Construction Code and Regulations. External networks and water development facilities and sewage plants and other normative -technical documentation providing for the high quality of welding works.

  Production personnel is certified on the basis of 0.00-1.16-96 according to the welding procedures:

  •   manual arc welding (111);
  •   submerged arc wire electrode welding (121);
  •   consumable electrode inert arc welding (131); ;
  •   consumable electrode reactive gas arc welding (135);
  •   shielded reactive gas flux cored welding (136);
  •   flux-cored inert gas welding (137);
  •   tungsten inert-gas arc welding with filler wire or without it (141)
 

 

Portal gas-cutting machine, OMNIMAT (Germany). Range of cut thicknesses from 6 to 300 mm, positioning accuracy ±0,5 mm.

 

  Production personnel is certified on the basis of ¨¸€ˇ¸ 0.00-1.16-96 according to the welding procedures:

  •   manual arc welding (111);
  •   submerged arc wire electrode welding (121);
  •   consumable electrode inert arc welding (131);
  •   consumable electrode reactive gas arc welding (135);
  •   shielded reactive gas flux cored welding (136);
  •   flux-cored inert gas welding (137);
  •   tungsten inert-gas arc welding with filler wire or without it (141)
 


  

CNC Portal gas-cutting machine, OMNIMAT, Germany. Range of cut thicknesses from 6 to 300 mm, accuracy ±0,5 mm.
OMNIMAT

 

OMNIMAT
A CNC “CORTINA DP” (Czech Republic) portal plasma cutting machine provides cutting of thicknesses 5 to 70 mm, with an accuracy of cutting being ± 0,5 mm and plate sizes cut being 2500 x 6000 mm.

 

Machines
1 Plate-straightening machine;
2 250 tf Crank plate-bending press;
3 Machine for milling plates up to 80 mm thick, 3000 mm wide, of steels cl. 275;
4 630 tf Flanging press;
5 Edge-planing machine with planing edge of 125,000 mm.

 

MECHANIZED GAS – SHIELDED ELECTRIC-ARC WELDING

This kind of welding includes CO2 -shielded welding, argon or helium welding or gas mixture- shielded welding. The main welding facilities comprise the highly efficient universal welding units made by Messer and EWM (both of Germany) and fitted with the microprocessor - based inverter supplies. The key advantage of these units is that they provide a lot of possibilities of the welding control at all its stages including metal transfer, metal motion in a weld bath, weld crystallization and degassing, formation of the required weld shape and surface quality.
Characteristics of products to be welded:
Maximum length of parts to be welded, mm 35000
Maximum weight, t 250
Thickness of metal to be welded, mm up 1 to 200
FLUX ELECTRIC ARC WELDING IN NARROW GAP GROOVING OF THICK-WALL CYLINDRICAL CONSTRUCTIONS
 The main welding facilities comprise the highly efficient welding units made by Messer and EWM (both of Germany) and fitted with the microprocessor – based inverter supplies. The key advantage of these units is that they provide a lot of possibilities of the welding control at all of its stages including metal transfer, metal motion in a weld bath, weld crystallization and degassing, formation of the required weld sh
Characteristics of products to be welded:
Max.dia, mm 4300
Length, mm 17000
Thickness, mm up to 500
Weight, t 300

 

AUTOMATIC ELECTRIC ARC FLUX DEPOSITION WITH ELECTRODE OSCILLATION

Characteristics of deposited layer - corrosion and wear resistance.

 
Characteristics of products to be welded:
Maximum length of part to be deposited, mm 14000
Maximum diameter of part to be deposited, mm 200..2000
Maximum weight of part to be deposited, t 100
Flux deposition

ORBITAL WELDING OF PIPELINES

To provide precision welding of pipelines, an orbital welding unit made by POLYSOUDE (France) is used. It enables to carry out automatic welding of the non - rotatable welds with the nonconsumable electrodes with the filling wire being used or without it. A pulsed arc welding or welding with the transverse oscillations of electrodes may be applied. Microprocessor-based control provides a lot of possibilities for programming a welding cycle and for documenting the process parameters

 
Characteristics of parts to be welded:
Min. pipe dia, mm 14
Max. pipe dia, mm 245
Wall thickness,mm up 1 to 20

 

ELECTROSLAG WELDING
NKMZ remains the leader in mastering and application of electroslag welding (ESW) practice that allows a fabrication of parts weighing up to 300t of forged blanks and cast sections as well as of plates and composite blanks. The mechanical properties of the welds are as good as the same of the base metal. If required, the elements of higher strength steel are welded into the most stressed elements of the structure. The techniques and procedures and equipment for electroslag welding make it possible to weld the parts with the section of 4500x5500 mm (thickness of elements being welded x weld vertical length).

1 Press spacer SRP-R 5000
Material

GS-20Mn5 DIN 17182

Section to be welded 740x900
Weight, t 50
2 Cylinder body
Material 20 CNMV
Section to be welded 1430x2930
Weight, t 145
3 Bottom cross-piece for press with capacity of 90 MN
Material GS-20Mn5(20 ĆĖ)
Section to be welded 2490x3860
Weight, t 150

Welding examples