Method of arc welding with non-consumable electrode

 

(57) Abstract:

The method can be used for automatic welding of thin-walled blade surfaces of the parts. On the weld pool is affected by mold. A filler wire pre Elektroizolit. Serves a filler wire to the weld pool when the potential difference between the wire and fuse item and stop filing with the disappearance of the potential difference. The method provides high quality surfacing and savings filler wire. 3 Il.

The invention relates to a method of welding with non-consumable electrode and can be used for automatic welding of thin-walled blade surfaces of the parts in all industries.

There is a method of arc welding with non-consumable electrode, which serves a filler wire to the weld pool and affect the weld pool by the mold (and.with. The USSR 1540981, 23 To 9/16, 1987).

The disadvantage of this method is the possibility of increasing the size of the weld pool due to violations of heat caused by heating of the mold, mechanical deformation or inaccuracies settings technologiesis electrode, when creating a weld pool, serves a filler wire to the weld pool and affect the weld pool by the mold (patent of the Russian Federation 2078655, 23 To 9/04, 1994).

The disadvantage of this method is the relatively large volume of the weld pool, which has a mechanical effect of the mold. Weld platen has a large machining allowance.

The technical result of the invention is surfacing blade surfaces of the parts with a minimum allowance for handling by reducing the volume of the weld pool and diameter surfaced roller.

The technical result is achieved by the fact that when welding with non-consumable electrode creates a weld pool, a filler wire is served in the weld pool and affect the weld pool by the mold, a filler wire having first Elektroizolit, and a filler wire served in the weld pool when the potential difference between the filler wire and fuse item and stop filing filler wire with the disappearance of the potential difference.

There is a method of automatic arc welding kalavassos, served in the tail part of the bath, and fluctuations of its exercise within the liquid bath with the amplitude, the smaller the amplitude of oscillation of the electrode.with. The USSR 596394, 23 To 9/16, 1978).

A disadvantage of the known technical solution is the impossibility of welding thin-walled blade surfaces of the parts because of the relatively large volume of the weld pool.

The applicant has not found a technical solution in which the filler wire for automatic welding elektrosokirani from welding equipment, and a signal for feeding filler wire is the appearance of a potential difference between the filler wire and the workpiece.

In Fig.1 shows a diagram of the method;

in Fig.2 is a view As in Fig 1;

in Fig.3 shows the phase deposition process.

The method is implemented as follows.

Item 1 is installed so that surfaced between the surface 2 and the mold 3 is formed the technological gap h. In the area of welding lead welding head 4 with non-consumable electrode 5 and the filler wire 6 to contact with the fused surface 2 (Fig.3,a). Include installation, submit current, are surfacing. Filler wire 6 to the image and details 1.

Filler wire 6 melts, breaks away from the weld pool (Fig. 3, g), and the head of the weld pool can be moved in the tail, forming an influx in the form of a drop.

Filler wire 6 and the feed mechanism 7 of the filler wire 6 elektrosokirani from all equipment. With the disengagement of the filler wire 6 from the weld pool potential difference appears between the filler wire 6 and item 1.

When the potential difference voltage sensor 8 gives the command to activate the feeding mechanism 7 of the filler wire 6. Filler wire 6 is fed into the head part of the welding bath to contact with it (Fig.3,D.). The feed mechanism 7 of the welding wire 6 is turned off when the disappearance of the potential difference between the filler wire 6 and 1. Gathered drop in the welding bath is stretched surfaced surface 2 (Fig.3,e). The volume of single weld pool remains constant, but the diameter of the filler cushion is reduced. At the same time, the tail portion of the weld pool solidifies, and the filler wire 6 is fused (Fig.3,g). With the disengagement of the filler wire 6 from part 1, the potential difference appears (Fig.3, C). Cycle to repeat thin-walled parts (material details EP 648, component width 1.5 mm) to a height of 0.8-1.0 mm using a filler wire EP-648 diameter of 1.6 mm, the deposition rates of 10 m/h. Power supply SVU-400, current welding 50-55 A.

In the area of welding lead welding head and welding wire. A filler wire down to contact with the fused surface. Include installation, submit current, are surfacing. When the potential difference between the workpiece and the filler wire, the control unit includes a mechanism for feeding the filler wire. The feed speed of the filler wire 50 to 70 m/h. The mechanism for feeding the filler wire is disconnected when the appearance of a potential difference.

The average height of the deposited bead is 1.1 mm

The automatic welding of the blade surfaces of the parts saved filler wire, the quality of the welding improves the performance when machining the weld surfaces.

Method of arc welding with non-consumable electrode, which creates a weld pool, a filler wire is served in the weld pool and affect the weld pool the mould, characterized in that the filler wire has preliminarily is in between the filler wire and fuse item and stop filing filler wire with the disappearance of the potential difference.

 

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FIELD: processes for surfacing with use of lying electrode, possibly restoration of worn surfaces of parts in different industry branches.

SUBSTANCE: method for surfacing bead of rollers of road building machines comprises steps of arranging roller in such a way that its axis is vertical; dividing surfaced zone of bead by technological sectors; forming electrodes of n mutually joined rods bent along arcs of sectors and arranging them on surfaced area of respective sector with gap; supplying flux and additive powder material to surfaced zone; connecting electrode and part with power source for exciting electric arc and performing surfacing; placing electrodes on sectors of bead simultaneously along the whole circle; electrically connecting front end of one electrode with bead; at surfacing narrow beads, forming electrodes of n mutually joined rods arranged one over another.

EFFECT: enlarged manufacturing possibilities of method for surfacing parts with annular worn surface, lowered cost, enhanced efficiency of process.

3 cl, 5 dwg, 1 ex

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