The method of welding with non-consumable electrode submerged arc

 

(57) Abstract:

The method can be used in the welding industry. Welding lead submerged arc consumable electrode AC. Use pulses of alternating current rectangular shape. On the molten metal weld pool influence of the longitudinal magnetic field in the period of the pulse of the opposite polarity. The ratio of the current pulse forward and reverse polarities of 10:1. The method can improve the formation of the welded seam by eliminating one-sided cut.

The invention relates to mechanical engineering and can be used in the welding industry.

There is a method of submerged arc welding in which to eliminate cutting with the aim of improving the quality of forming a seam carry out the second passage surface arc with reduced current and increased arc voltage [welding in engineering/Handbook so 1/ Ed. by N. A. Olshansky - M.: Mashinostroenie, 1978, S. 221].

The disadvantages are the counterpart of the decline in productivity with increasing labor and energy costs, the inadmissibility of repeated heating of a range of materials with low heat input (for example, the possibility of podczenie quality formation of a seam exercise coercive pressure on the liquid metal in the rear part of the tub [MKI4AC USSR N 1240530 B 23 K 8/13, 1986].

The disadvantages are the counterpart significant consumption of scarce protective gas, the leakage of liquid metal on the surface of the welded edges, unacceptably large for many materials the cooling rate of the weld metal.

There is a method of arc welding using a reversible longitudinal magnetic field to control the hydrodynamics of the melt [Magazine "Welding production", 1975, No. 11, S. 3 - 5].

The disadvantage of analogue is that used in the way reversible magnetic field does not provide displacement of the melt in the direction of unilateral cut.

The closest in technical essence and the achieved result is a method of electric arc welding modulated current with a low frequency [IPC6AC USSR N 508356 B 23 K 9/16, 1976].

The disadvantages of the prototype are the reduction in process performance due to periodic current reduction; the need for special devices that provide periodic vertical lifting and lowering of the electrode, synchronized with the current change; small changes in the modes can lead to "freezing" of the electrode and thereby the violation process the molten metal have significant volumetric electromagnetic forces directed to the axis of the weld. As a result, the edges of the seam having undercuts. Reduction of scores is possible to achieve a significant reduction in welding speed, but in this case you lose the main advantage of the method. Bilateral symmetrical undercut occurs when placing electrical power supply strictly along the axis of the weld. In real structures the current lead, as a rule, placed on one side of the seam, so that the current density from the electrical power supply and more. This leads to the violation of the symmetry of the cross-section of the seam and there is a one-sided undercut on the side opposite to the electrical power supply.

The task to be solved by the invention is the improvement of the formation of the weld due to elimination of one-sided cut.

This object is achieved in that in the method of welding with non-consumable electrode submerged arc with exposure to the molten metal weld pool of a longitudinal magnetic field during welding using pulses of alternating current rectangular shape with a ratio of pulse current straight polarity and reverse polarity 10:1, and the molten metal weld pool through the solenoid influence of the longitudinal magnetic field in the peri and the welded sheets. In this case, the movement of the metal weld pool from the electrical power supply is inhibited, and on the opposite side (i.e. with the possibility of cutting) is accelerated. Eliminates the one-sided undercut and asymmetry of the weld.

A specific example of implementation of the method.

Weld samples of steel 12X18H10T thickness = 12 mm

The welding start the process plate of the same material, gradually increasing the current and the depth of the electrode.

Steady state welding: welding current I = 600 A; arc voltage Ud= 12 V; welding speed VSt= 10 m/h

The magnitude of the magnetic induction coil In = 0,025 So

Welding is carried out pulses with a frequency of 50 Hz. Time reverse pulse, i.e., the switching time of the solenoid, as well 0,018 C.

When welding without solenoid samples had unilateral cutting depth of 1.5-2.0 mm Application solenoid entirely eliminated the undercut. Thus, the proposed method allows to eliminate one-sided undercut and improve the shape of the seam without the use of filler material and re-melting of the weld.

The method of welding with non-consumable electrode submerged arc, including the maintenance of swar is wearing current pulse forward and reverse polarities of 10 : 1, and the molten metal weld pool through the solenoid influence of the longitudinal magnetic field in the period of the pulse of the opposite polarity.

 

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