SU1212730A1 - Device for alternating current arc welding - Google Patents

Description

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The invention relates to electric welding equipment, in particular to devices for arc welding with alternating current, and can be used to control the current during welding with a melting and non-consumable electrode.

The purpose of the invention is to expand the technological capabilities by using for multi-spot welding. .- ..

On. FIG. 1 shows a principal electrical circuit of an AC arc welding device when used in multi-stage welding; in fig. 2 - Constructive use of the magnetic system of the current regulator for arc welding with alternating current.

The device contains a current regulator for arc welding with alternating current, consisting of two cores 1 and 2, with windings 3 and 4, respectively, and a rod 5, separated from cores 1 and 2 by air gaps. Two parallel-connected thyristors 6 and 7 with control unit 8 are connected in parallel with winding 4. With fixed air gaps between the rom 5 and the cores 1 and 2, the maximum inductive resistance of the current regulator for AC arc welding is determined by the sum of the number of turns of the windings 3 and 4, and the minimum inductance is the number of turns of the winding 3,

For A multi-station system uses one welding transformer 9 with a hard external current-voltage characteristic and two or more current regulators for arc welding with alternating current, which are located one at each welding station and connected to the welding transformer 9 using busbar 10 The power of the welding transformer 9 is determined by the total power of all the welding stations.

The AC arc welder operates in the following manner.

12127302

The change in the inductive resistance of the current regulator and, consequently, the change in the current flowing in the welding circuit

5 phase control thyristors 6 and 7. When thyristors 6 and 7 are switched off, the inductive resistance of the current regulator for arc welding with alternating current is maximum, and

10 welding current is minimal. With open thyristors 6 and 7, the inductive resistance of the current regulator is minimal, and the welding current reaches its maximum value. Thus, at the expense of a smooth change in the opening angle of the thyristors 6 and 7, a smooth change in the welding current is provided.

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Introduction to the magnetic system of the current regulator additional drossel magnetowired with the welding welding throttle, parallel to the winding of which two oppositely connected thyristors are connected, with the windings of the additional and welding throttles connected in series, provides the falling current-voltage characteristic at the output terminals of the welding circuit in the whole range changing the unlocking angle of the thyristors of the current regulator for arc welding with alternating current when used as a source of power audio power transformer with a rigid external volt-ampere characteristic as in odnopostovoj and at mnogotsostovoy

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welding, and in the latter case, independent control of the current at each welding station is provided.

The use of the proposed current regulator for arc welding with alternating current for multi-station welding allows efficient use of the production area — using a power transformer of the simplest design with a lower consumption of materials and a higher efficiency as compared to a known controller.

Introduction to the magnetic system of the current regulator additional russel, magnetowired with the welding welding rotor, parallel to the winding of which two oppositely connected thyristors are connected, with the windings of the additional and welding throttles connected in series, provides the falling current-voltage characteristic at the output terminals of the welding circuit in the whole range changing the unlocking angle of the thyristors of the current regulator for arc welding with alternating current when used as a source of power and a power transformer with a rigid external volt-ampere characteristic as in odnopostovoj and at mnogotsostovoy

welding, and in the latter case, independent control of the current at each welding station is provided.

The use of the proposed current regulator for arc welding with alternating current for multi-station welding allows efficient use of the production area — using a power transformer of the simplest design with a lower consumption of materials and a higher efficiency as compared to a known controller.

Compiled by I.Lurie Editor N.Pushnenkova Tehred O.Vashchishin Proofreader M.Samborska

Order 700/20. Circulation 1000 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk on b., d. 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

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Claims (1)

ARC ARC WELDING DEVICE, containing a welding transformer, in series with the secondary winding of which a current regulator is installed, made in the form of a choke, parallel to the winding of which are connected · two countercurrently connected thyristors with a control unit, characterized in that, in order to expand technological opportunities by using the device in multi-post welding, an additional shotgun is introduced into the device, both chokes being made with a common yoke, and their windings are included The sequence according to the.