Electric arc igniting method

FIELD: welding processes and equipment, namely method for igniting DC arc by means of consumable electrode at automatic or semiautomatic welding.

SUBSTANCE: method comprises steps of setting extension of consumable electrode; turning on circuit for power supply of arc by electric current 1.5 - 6 A at inductance of welding circuit 5 - 15 mH and at discharge of capacitors with capacitance 1000 - 2000 mcF. Electric arc is ignited at touching by means of end of electrode with predetermined extension. After occurring on end of electrode extension liquid metal layer or drop, working arc power supply circuit is turned on and circuit for power supply of arc with electric current 1.5 - 6 A is turned off. Presence of solidified metal drop whose diameter exceeds that of electrode by 1.5 - 2.5 times on end of electrode corresponds to stable ignition of arc.

EFFECT: simplified process of arc ignition, stable ignition at presence on end of electrode solidified metal drop.

1 ex

 

The invention relates to the field of welding equipment, and more particularly to a method of ignition DC arc consumable electrode.

There is a method of ignition of the arc when welding with consumable electrode with a diameter of 0.8-2 mm, which provides a continuous supply under the open-circuit voltage of the power supply before contact with the product. Under the influence of the short circuit current is heated and the release of the metal electrode after several contacts before you installed the combustion process arc (Chinagorom, Ngulube, Istarski. The ignition of the welding arc. Rostov-on-don: publishing house "Hephaestus", 1999, 200 S. (p.9-10)).

The disadvantage of this method is that the excitation of the arc occurs after three or four contacts with the workpiece with the release of the pieces of wire outside of the seam.

Also known which is the technical entity closest to the proposed technical solution the pulse arc welding with consumable electrode, which serves the electrode to the product and inhibit it during phase short circuit (A.S. USSR №916174, MKI UK 9/16, UK 9/18, publ. in BI 1982, No. 12).

The disadvantage of this method is the difficulty of establishing a braking consumable electrode at high speeds its filing with semi-automatic and automatic with the arch.

Due to the deceleration electrode ignition does not occur, and there is an increase in temperature at the radius of the electrode, which does not guarantee a stable arc ignition feed speed of the electrode at the operating currents of welding. Also during breaks in the arc the presence of frozen droplets at the end of the electrode exacerbates the reliable ignition of the arc.

Object of the invention is stable arc ignition semi-automatic and automatic welding consumable electrode without emission electrode pieces outside seam, and provides stable arc ignition available at the end of the flight electrode frozen droplets greater than the electrode diameter 1.5-2.5 times or more.

The problem is solved in that in the method of ignition of the arc constant current with automatic or semi-automatic welding consumable electrode comprising electrode feeding the product and the ignition of the arc according to the invention initially set the departure consumable electrode include a power circuit of an arc current of 1.5-6 And the inductance of the welding circuit 5-15 μh and the capacitor discharge capacity of 1000-2000 IFF, and by touching the electrode end with set departure kindle arc, after appearing on the late departure of the electrode layer of liquid metal or drops include the power supply circuit of the working arc, and power supply circuit, an arc current of 1.5-6 And disconnected.

An example of a specific implementation.

Set the feed speed of consumable electrode with a diameter of 0.8-1.2 mm 150-800 m/h, which corresponds to the welding current in carbon dioxide 45-320 A. welding torch set a fixed electrode extension 8-10 dE(dEthe electrode diameter in mm). Tight sliding contact in the current-carrying tip of the burner allows you to record the departure of the stationary electrode. In the power circuit of an arc current of 1.5-6 And include inductance (choke) 5-15 mH. Increased open-circuit voltage of the rectifier 53-85 In is provided by the inclusion of capacitors 1000-2000 IFF the voltage doubling circuit. Due to the inclusion of the capacitor open-circuit voltage of the rectifier with a steep characteristic in 2.82 times the voltage of the arc in carbon dioxide at the operating currents 45-320 A. After the filing of protective gas through 3-4 with the end of the cold motionless departure touch of a welded product ignites the arc on the current 1.5 to 6 A. After appearing on the late departure of the electrode layer of molten metal or hot arc drops through the 0.2-1 include a power supply circuit of the working arc current 45-320 And with hard or polegada characteristic of the rectifier (i.e. with increasing current, the arc voltage is not reduced), and power supply circuit, an arc current of 1.5 6 And disconnected. Due to the heating of departure arcs is th, the presence of a liquid layer of molten metal on the end of the flight electrode and ionized arc gap ignition of the arc on the current 45-320 And occurs without the emission of pieces of the electrode at the moment of ignition of the arc on the operating current. At breaks in the arc and the presence on the electrode end of the solidified droplets greater than the electrode diameter 1.5-2.5 times or more, the ignition of an arc current of 1.5-6 And exercise touch a frozen drop of the product without removing it. After heating the droplets arc include the supply circuit arc currents 45-320 and the feed electrode and the power supply circuit arc currents of 1.5-6 And disconnected. The implementation of this method simplifies and ensures the ignition of the arc without emission electrode pieces, allows you to apply the ignition of the arc from rectifiers with diodes and frozen cold drop on the end of the flight, greater than the electrode diameter 1.5-2.5 times, without removing it when the ignition of the arc.

The method of ignition of the arc constant current with automatic or semi-automatic welding consumable electrode comprising electrode feeding the product and the ignition of the arc, wherein the first set departure consumable electrode include a power circuit of an arc current of 1.5-6 And the inductance of the welding circuit 5-15 μh and the capacitor discharge capacity of 1000-2000 IFF, and by touching the electrode end with set departure kindle arc, the donkey appears on the end of the flight electrode layer of liquid metal or drops include the power supply circuit of the working arc, and the power supply circuit of an arc current of 1.5-6 And disconnected.



 

Same patents:

FIELD: methods for controlling ignition of welding electric arc at manual welding by means of coated electrode after breaking of short circuit between electrode and part.

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FIELD: methods for controlling ignition of welding electric arc at manual welding by means of coated electrode after breaking of short circuit between electrode and part.

SUBSTANCE: method comprises steps of touching welded part with electrode in place of welded seam beginning; exciting electric arc at time moment of electrode and part disconnection; detecting time moments of electrode and part touching and disconnection respectively by measuring changes of electric current and voltage in between electrodes. Electric arc is excited by three stages. At first in time moment of electrode and part touching short initial mode of hot starting sufficient for heating electrode is realized. After first time period short circuiting limitation mode is created when electric current value is sufficient for sustaining electrode in heated state without increasing contact area and close sticking. It provides controlled electrode sticking. At time moment of electrode tearing off secondary mode of hot starting with increased electric current is realized and electric arc is ignited between electrodes. Short initial hot starting mode is realized at electric current consisting 1.5 - 2 of preset welding current; duration of said initial hot starting mode is in range 0.5 - 1.0 s. Electric current value in short circuiting mode is selected in range 0.1 - 0.3 of preset welding current.

EFFECT: enhanced reliability of electric arc ignition process.

6 cl, 3 dwg

FIELD: welding processes and equipment, namely method for igniting DC arc by means of consumable electrode at automatic or semiautomatic welding.

SUBSTANCE: method comprises steps of setting extension of consumable electrode; turning on circuit for power supply of arc by electric current 1.5 - 6 A at inductance of welding circuit 5 - 15 mH and at discharge of capacitors with capacitance 1000 - 2000 mcF. Electric arc is ignited at touching by means of end of electrode with predetermined extension. After occurring on end of electrode extension liquid metal layer or drop, working arc power supply circuit is turned on and circuit for power supply of arc with electric current 1.5 - 6 A is turned off. Presence of solidified metal drop whose diameter exceeds that of electrode by 1.5 - 2.5 times on end of electrode corresponds to stable ignition of arc.

EFFECT: simplified process of arc ignition, stable ignition at presence on end of electrode solidified metal drop.

1 ex

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SUBSTANCE: reliability of repeated arc firing is estimated, in analysing coated electrodes, proceeding from actual conductivity magnitude defined in contact between flowed end face of interconnected electrode under analysis and metal plate. Obtained magnitudes of actual conductivity allow estimating reliability of repeated firing. Higher the conductivity, higher reliability of repeated firing.

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Method of welding // 2406597

FIELD: process engineering.

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10 cl, 3 dwg

FIELD: process engineering.

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EFFECT: higher reliability.

3 cl, 3 dwg, 3 ex

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