Method of arc welding with non-consumable electrode feed filler wire and device for feeding the filler wire

 

(57) Abstract:

Use: engine-building, shipbuilding, oil and gas, tool and other industries. The inventive when arc welding with non-consumable electrode feed filler wire filler wire serves continuously and simultaneously tell her the reciprocating movement. The electrode and filler wire set respectively at angles of between 15 and 20oand from 40 to 45othe vertical on the opposite side of it, and the arc gap is taken equal to from 2 to 3 mm. Device for feeding the filler wire contains a continuous wire, and mechanism for reciprocating movement, comprising an electric motor, a gear attached to the shaft of the Cam, a spring-loaded lever and casing, with one end of a lever provided with a roller cooperating with the Cam, and the other is connected with the case installed in the cylindrical housing with the possibility of longitudinal movement and connected with a flexible hose. 2 S. p. f-crystals, 2 ill., table 1.

The invention relates to the field of welding and can be used for arc welding with non-consumable electrode with the mental and other industries.

The known method argon-arc welding with non-consumable electrode, in which the filler wire is fed to the weld pool continuously at a constant speed specified value [1]

Such a welding method does not provide a stable droplet size of the molten filler metal and allows you to get the weld pool of a given size.

The closest technical solution, selected as a prototype, is a method of arc welding with non-consumable electrode [1]

How is that set the gap between the electrode and filler wire, set the moving parts include the welding current and continuously serves a filler wire with optimum speed, with a maximum speed in excess of the optimal n-times, which makes it possible to increase the efficiency of the process.

This method cannot be used to produce miniature hardfacing of rollers, because it is aimed at removing the drip wire transfer in the weld pool and to increase the flow of wire that allows you to weld details of great thickness with fewer passes.

The closest in technical essence to declare Adonai wire arc welding with non-consumable electrode, comprising a housing installed in its continuous wire feed, including the drive, guide rollers, a flexible hose wire and cylindrical body with a tip rigidly mounted on the bracket.

However, this device does not provide the miniature weld beads.

The challenge which seeks the invention consisted in providing opportunities in the welding process dosed, mainly with the minimum volume of the weld pool and the miniaturization of the weld beads.

The problem is solved by the fact that in the method of arc welding with non-consumable electrode, namely, that set the gap between the electrode and filler wire, set the moving parts include the welding current and continuously serves a filler wire to the welding zone at an angle to the axis of the weld filler wire report in addition, the reciprocating movement, while the electrode and filler wire are oriented respectively at angles of 15-20oand 40-45othe vertical on the opposite side of it, and arc gap set the size of 2-3 mm

To implement this the General case with the installed by a continuous wire feed, including the drive, guide rollers, a flexible hose wire and cylindrical body with a tip rigidly mounted on the bracket, provided with mechanism for reciprocating movement of the wire, consisting of a motor, a gear attached to the shaft of the Cam, a spring-loaded lever and casing, with one end of a lever provided with a roller cooperating with the Cam, and the other is connected with the case installed in the cylindrical housing with the possibility of longitudinal movement and connected with a flexible hose.

In order to understand the invention, it is necessary to consider the process of melting the filler wire if it is continuous and pulsating flow.

When welding with a continuous supply of filler wire wire approaches the weld pool is relatively slow (tens of mm per minute). This leads to the fact that the wire prematurely heated by radiation from the welding arc, prematurely melt with the formation of large drops, overflowing the weld pool, the size of which is non - adjustable. This process is not suitable for welding of miniature elements, for example, edges of the blades, teeth mazes, etc. which indicate the reciprocating movement. This causes the wire to approach the weld pool is very fast (tens of mm / sec), which means that she does not have time to overheat the heat of the arc and enters the weld pool in the form of small droplets measured size-dependent parameters of welding conditions which have a cooling effect. It does not allow the weld pool to increase its volume. After contact with the welding bath filler wire quickly drawn into a cooled nozzle and podslushivaet, which further contributes to the development of atomized transfer, and trapped in the weld pool small drops form a narrow miniature roller.

The technical result (obtaining a measured amount of deposited metal) is achieved when all essential features of the method of arc welding with non-consumable electrode and device for its implementation. When this electrode and filler wire are installed respectively at angles of 15-20oand 40-45othe vertical on the opposite side of it and the arc period is set by the size of 2-3 mm

The angle of the filler wire to the vertical within 40-45oselected from the exception conditions slippage wires is t inadvertent slippage of the wire in the flexible hose and the movable yoke and the difficulty reverse wire which leads to the violation of atomized transfer and failures in the process of melting the wire due to its unstable output from the welding zone and the deterioration of the formation of a seam.

The angle of the electrode to vertically within 15-20oprovides a stable arc in the zone configuration of electrode and filler wire, which contributes to a more stable flow of atomized process of transferring filler metal in the weld pool. When the angle of inclination of the electrode in one direction or another changes the relative positions of the electrode and filler wire, the anode spot is shifted and the process of melting the wire is broken, which leads to deterioration of formation of the weld.

The magnitude of the arc gap of 2-3 mm is chosen from the condition stable arc in the process of atomized metal transfer. When increasing the arc gap in excess of 3 mm disturbed nature of the molten droplet transfer wire to the weld pool, which affects the stability of the welding process and the formation of a seam. Decreasing the arc gap of less than 2 mm, there is the danger of "uticaria" wire to the end of the tungsten electrode and short samegeneration feeding filler wire, it contains a tungsten electrode (1), filler wire (2) and the welded part (3) of Fig. 2 diagram of the device for feeding the filler wire, it contains the bracket (4) which includes a continuous wire feed, consisting of an electric motor (5) and enclosed in the housing (6) of the guide rollers. The mechanism for reciprocating movement of the wire includes a flexible hose (7), coupled with a continuous wire, ending in a cylindrical housing (8) with a tip in the form of a nozzle (9) in which the movable ferrule (10); the Cam (11) mounted on the same shaft with the electric motor (12) and gear (13); a lever (14), through the bronze roller (15) associated with the Cam (11) and through the slot 2 of the pin with movable yoke (10). A cylindrical housing (8) with a flexible hose (7) rigidly connected to the bracket (4). Spring (16) serves to return the lever (14) to its original position.

The method is as follows. Svarivaemost product (3) is installed in the device on the manipulator, which provides the moving parts. A tungsten electrode (1) is installed above item (3) on one side from the vertical at an angle of 15-20othereto, and a filler item and the surface of the workpiece is set by the value of 2-3 mm. Include moving parts, welding current and a continuous supply of filler wire. Then include a mechanism reciprocating movement of the wire that tells the wire additional reciprocating pulses following each other with a certain adjustable frequency, the period of which is provided by the rapid flow of filler wire to the weld pool and the rapid withdrawal of it from the welding zone.

The device operates as follows. Wire passing through the guide rollers of a continuous wire feed enters the flexible hose (7). Passing through it, the wire is bent and routed in the channel of a mobile holder (10) located in the cylindrical housing (8) with a tip (9) and is fed into the welding zone at a constant speed. When enabling mechanism for reciprocating movement of the wire Cam (11) starts to rotate with a frequency proportional to the rotational speed of the motor shaft (12). Rotational movement of the Cam through the bronze roller (15) and the lever (14) is converted into the reciprocating movement of the holder (10), which begins to oscillate together with passeth filler wire. Prosultiamine (16) serves to return the lever (14) in its original position and the output wire from the welding zone. The pulse frequency of the wire is governed by the number of revolutions of the motor (12), and the total feed rate of filler wire in the pulsing mode is equal to the vector sum of continuous and pulse speeds:

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An example of the method.

How argon-arc welding with non-consumable electrode with a pulsating supply of filler wire was carried out in mechanized welding scallops labyrinth seals of steel MF-W with filler wire brand swim diameter of 1.2 mm

The welding was performed on the welding machine ADSW-6 using the power source SVU-315.

Part (flange labyrinth 40-04-093) was installed in the fixture, which was fixed on the faceplate of the rotator.

Established welding head on the center prong of the maze so that the tungsten electrode and filler wire is positioned at angles to the vertical (on different sides) that are listed in the table.

Established arc gap between the electrode end and the surface of the tooth within the limits specified in the table.

Included rotation of the workpiece, welding current, continuous and pulsed feeding the filler wire Yergali external inspection, ultrasonic testing and metallographic studies. The quality of the formation of hardfacing beads are stable and homogeneous, defects in the form of incomplete fusion, pores, cracks are not detected.

The application of the method in comparison with the prototype has reduced directional metal and get a miniature surfacing rollers, as well as to reduce heating of the molten metal weld pool and the tendency to form cracks in the weld zone.

1. Method of arc welding with non-consumable electrode feed filler wire, namely, that set the gap between the electrode and filler wire, set the moving parts include the welding current and continuously serves a filler wire, characterized in that the filler wire report in addition, the reciprocating movement, while the electrode and filler wire set respectively at angles of 15 of the 20o40 45othe vertical on the opposite side of it, and the arc gap is taken equal to 2 3 mm

2. The device for feeding the filler wire during arc welding with a consumable electrode, comprising a housing installed in it a mechanism for continuously feeding the body with a tip, rigidly mounted on the bracket, characterized in that it is equipped with a mechanism for reciprocating movement of the wire, consisting of a motor, a gear attached to the shaft of the Cam, a spring-loaded lever and casing, with one end of a lever provided with a roller cooperating with the Cam, and the other is connected with the case installed in the cylindrical housing with the possibility of longitudinal movement and connected with a flexible hose.

 

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Method wire // 2012460
The invention relates to welding, in particular to a method of feeding wire into the welding zone, and may find application in various engineering industries, in the manufacture of welded structures

FIELD: machine engineering, namely apparatus for feeding wire with connector suitable for supplying welding wire to cable-hose of welding torch.

SUBSTANCE: apparatus includes portion for feeding wire and connection portion. Carrying bracket of wire feeding portion and housing of connection portion are made as one-piece block of plastics material. Inlet opening of portion for feeding wire is arranged opposite relative to opening for wire inlet at inner side of connection portion; the last opening is arranged at lower side of recess for guiding wire. There is member for introducing wire inside inner opening. Wire motion path restricted by said two openings passes between feeding roller and pressure roller. Axle of pressure lever supporting pressure roller or axle of fixing lever is secured to inner end of housing of connection portion, preferably to lug. Axle of other lever is secured to protrusion of carrying bracket of wire feeding portion. Said protrusion is arranged opposite another protrusion in order to provide possibility of angular motion of levers. Such design prevents bending and skewing of wire.

EFFECT: improved design providing easy access to apparatus and to connector at repairing and adjustment.

7 cl, 6 dwg

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