SU1698005A1 - Method of detecting drop transfer mode of electrode metal at arc welding by consumable electrode - Google Patents

Abstract

The invention relates to arc welding with a melting electrode and allows determining the nature of the drop transfer of the electrode metal during welding and surfacing. The purpose of the invention is to simplify the process of determining the shape of the transfer during the control and installation of the welding and cladding modes. In the process of welding on the arc impose an external longitudinal magnetic field. The pattern of drop transfer is determined by the current and voltage across the arc. Drop transfer corresponds to a decrease in current and an increase in voltage across the arc. With a jet, the voltage and current do not change. The method does not require complex equipment for its implementation and allows, without further processing of the experimental results, to determine the nature of the drop transfer. 3 il. & Yo

Description

The invention relates to arc welding with a melting electrode and can be used to determine welding conditions in various industries.

The purpose of the invention is to create a method for determining the nature of the drop transfer of an electrode metal through an arc gap, which allows to simplify the equipment for its implementation and, without further processing the results, determine the type of drop transfer, which makes the method much cheaper.

Fig. 1 shows a scheme for carrying out the method when an external longitudinal magnetic field is formed by an electromagnet located under the part to be welded; FIG. 2 shows the measurement results of the induction of the magnetic field in the zone of the arc method when the electromagnet is located under

welded part; FIG. 3 is a schematic of the method and results of measuring the induction of the magnetic field in the zone of the arc column when the electromagnet is located above the part to be welded.

The implementation of the method when installing an electromagnet under the welded part (see figure 1).

Around the steel cylinder 1, which is the core of the electromagnet, winding 2 is wound from a welding cable, one end of which is connected to the power source 3 of the arc, and the second to the steel plate 4, on which the surfacing is performed. An asbestos pad 5 is placed between cylinder 1 and plate 4 to heat and electrically insulate the core. The other pole of the power source 3 is connected with a current lead to the electrode wire 7 by means of a welding cable 6 and

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The position between the electrode and the part is equal to the arc.

Measurements of the induction of the magnetic field are carried out according to the scheme in Figure 2 at points located on the axis of the electromagnet at different distances from the surface of the part 4. 8 and 9 are the distribution of the longitudinal component of the magnetic field in the arc gap I.

The implementation of the method when installing an electromagnet above the part.

A winding 2 is wound on a cylinder 1 with an opening for an electrode 7 and placed over a piece (plate) to be welded 4. Measurements of the magnetic field induction are performed at points located on the axis of the electrode, at different distances from the surface of the part 4, 10 and 11 magnetic field, I is the distance between the electrode and the part.

An example of the method. Before welding, the machine sets the required electrode wire feed rate, current and voltage across the arc. The welding is switched on and the voltage and current are measured with a voltmeter and an ammeter without applying a longitudinal magnetic field (see Table 1).

Then, welding in both modes is carried out in an external longitudinal magnetic field with inductions of 100, 200 and 400 Gs. When the electromagnet is located under the detail, the welding cable connected to the machine and one of the poles of the power source is wound in several turns around a vertically mounted steel cylinder measuring 150x400 mm, which is the core of the electromagnet.

When the electromagnet is located above the part to be welded, the winding is connected to a separate power source and the voltage and current of the arc are re-measured (see Table 2).

The nature of the drop transfer is judged by the values of voltage and current. If the instrument readings do not change in both cases (2nd mode), then this indicates jet dropping. If the overlap of the longitudinal magnetic field and the voltage across the arc increased, and the current corresponded to fall (1st mode), then the electrode melting is characterized by droplet transfer.

The proposed method does not require sophisticated equipment for its implementation and makes it possible at the workplace, without further processing the experimental results, to judge the nature of the melting of the electrode metal. This significantly increases the cost-effectiveness of the comparison method.

Claims (1)

Invention Formula The method of determining the nature of the drop-transfer of electrode metal during arc welding with a melting electrode where the form of drop-transfer is determined by the current and voltage on the arc, characterized in that, in order to simplify the process, an external longitudinal magnetic field is applied to the arc, while the drop transfer corresponds to a decrease in current and an increase in voltage on the arc, and a constant current value and voltage corresponds to jet drip transfer. Table 1 Table 2 0 A // 7 0 figl