Technological potentialities. Welding

WELDING

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

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

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.

	Plate-straightening machine;
	250 tf Crank plate-bending press;
	Machine for milling plates up to 80 mm thick, 3000 mm wide, of steels cl. 275;
	630 tf Flanging press;
	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 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 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

Characteristics of products to be welded:
Max.dia, mm	3000
Length, mm	12000
Thickness, mm	up to 500
Weight, t	200

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	2400
Maximum weight of part to be deposited, t	100

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 non-consumable electrodes with the filling wire being used or not. 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 parometers.

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 was the leader and remains the same in mastering and application of electroslag welding practice that allows a fabrication of parts weighing up to 300t of high-quality properly forged 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 5000x6000 mm.

Press spacer SRP-R 5000
Material	GS-20Mn5 DIN 17182
Section to be welded	740x900
Weight, t	50
Cylinder body
Material	20 ????
Section to be welded	1430x2930
Weight, t	145
Bottom cross-piece for press with capacity of 90 MN
Material	GS-20Mn5(20 ?? )
Section to be welded	2490x3860
Weight, t	150