CN2248114Y

CN2248114Y - Rectifier welding set

Info

Publication number: CN2248114Y
Application number: CN 94245882
Authority: CN
Inventors: 余建明
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-11-07
Filing date: 1994-11-07
Publication date: 1997-02-26
Anticipated expiration: 2004-11-07

Abstract

The utility model relates to a rectifier direct-current welding set. Because of the arc power output of a general welding set is decreased at least three times, compared with inputted electric energy, the capacity of a transformer is large, the electricity and the copper and iron are saved, the size is larger, the weight is heavy, and the cost is high. The arc stabilising circuit of the utility model is connected in parallel with a main circuit, which can reduce the voltage of a main winding of the transformer; when the current output of the welding set is constant, and the electric arc is stable, the inputted electrical energy can be reduced by from 28% to 45%; the copper and the iron consumption of the transformer is less; the requirements of small size, light quantity and lower cost can be realized.

Description

Metal rectifier welding set

The utility model belongs to rectifier type dc welding machine field.

The crowd knows that manual electric arc welding or argon arc welding require welding machine higher floating voltage to be arranged in order to striking and stabilising arc, have the decline external characteristics to make outputting current steadily.Therefore, metal rectifier welding set floating voltage U _oBe generally 60～80V, and output arc voltage Uf: arc welding is generally 20～32V, and argon arc welding is generally 10～22V.For a certain rated welding current Ie, according to ampere-turn principles such as transformer primary and secondaries as can be known, the welding machine input capacity is about Q ₁=1.1UoIe, and the power output P of welding machine ₂=UfIe is less than 1/3 of input.For the industrial frequency rectifying welding machine, this is except the waste electric energy, and also because the increase of transformer capacity causes large body and heavy mass, the waste of copper iron is many, the result that manufacturing cost is high.

The purpose of this utility model just provides a kind of power and energy saving, small and light, province's material industrial frequency rectifying formula dc welding machine cheaply, comprises direct-flow argon-arc welder, dc pulse tig welding machine, dc arc welding machine.

The technical solution of the utility model is: with the welding circuit of welding machine is that output loop becomes by the two covers output loop that composes in parallel after the rectification respectively of winding independently mutually, and this two covers winding can be on same transformer, also can be not on same transformer; The input power supply of welding machine can adopt single-phase, also can adopt three-phase.Wherein a cover winding is called the voltage winding, also claims the stabilising arc winding, as figure Lv, can boost through capacitor filtering after this winding rectification, and again through the output of electric resistance partial pressure current limliting, output floating voltage U _oWith stabilising arc electric current I w, common U _oBe 60～80V, Iw is 2～12A; Lv can be made of a winding, also can be in series by two coils, also can be made of three-phase three windings.Another set of winding is called the electric current winding, also claim main winding, as scheme LA, output rated welding current Ie after this winding rectification, and there is electric current to regulate and obtain the device of decline external characteristics (or constant-current characteristics), the DC voltage Uz value of disregarding capacitance boost after this winding rectification generally is no more than 55V, specifically can determine according to welding machine kind and size of current, argon arc welding machine Uz=22+0.06Ie ± 5V, arc welder Uz=32+0.06Ie ± 5V, wherein the value of " ± 5V " is determined by design, general big the getting of main winding reactance "+", desirable "-" that reactance is little, the big Uz of Iw is desirable low, the little height of then answering; The alternating voltage of LA winding can calculate by the formula that electrotechnics provides according to determined Uz value and the rectifier system of being taked; The LA winding can by one mutually a winding constitute, or one mutually two windings also can constitute, or three-phase six windings (halfwave rectifier respectively) constitute through string or in parallelly constitute by three-phase three windings.The electric current of welding machine is regulated and the acquisition mode of decline external characteristics can adopt controllable silicon formula or magnetic amplifier or saturable reactor formula or moving core type or tapped, but from the material-saving small and light, with the controllable silicon formula is good, and tapped and moving core type is taken second place.

The metal rectifier welding set that the utility model provides is compared with former metal rectifier welding set, and its input capacity is transformer capacity Q ₁From 1.1U _oIe reduces to 1.1[U _oIw+UzIe].For single phase poaer supply, floating voltage is that 80V, rated welding current are the welding machine of 80A to 160A all size, if argon arc welding, then input capacity is reduced to 1.1[80 * 5+ (26.8～31.6) (80～160)/0.95 from 1.1 * 80 (80～160)] reduced 58%～54%, promptly saved 58～54% electric energy; If 1.1[80 * 5+ (36.8～41.6) (80～160)/0.95 is reduced in manual metal-arc welding then input capacity], reduced 46%～42%, because capacity diminishes, make the transformer small and light that becomes, the copper and iron saving, the percentage that copper iron is saved is close with the electric energy saving.

Accompanying drawing is the output loop of single-phase silicon-controlled welding rectifier, and Lv is a transformer secondary output stabilising arc winding, is boosted by capacitor filtering behind bridge rectifier, again by R ₁R ₂The dividing potential drop current limliting makes R ₂Two ends output floating voltage U _o=60～80V, R during welding ₂Both end voltage has become arc voltage Uf, and R flows through this moment ₁Electric current I w=2～12A.LA is the transformer secondary output main winding, and through full-bridge rectification output, its electric current is regulated and the decline external characteristics is by V ₁V ₂Controllable silicon is realized.

Realizing a kind of mode of the present utility model, is example with NSA (WS)-160 manual metal-arc welding, argon arc welding dual-purpose welding machine, and 380V or two kinds of power supplys of 220V are adopted in input, and its primary adopts tapped switching 380V or 220V.Transformer secondary output is that output loop is seen accompanying drawing: stabilising arc winding L v and main winding LA are two groups of secondary windings of same transformer, and Lv is 70V, and after the bridge rectifier capacitor filtering boosted, its DC voltage was about 98V, R ₁Be about 21 Ω, R ₂Be about 100 Ω, floating voltage U _oBe about 80V, it is 42V that stabilising arc electric current I w is about 4A, LA, the direct current Uz value that capacitance boost is disregarded in full-wave rectification is about 40V, its input capacity 1.1 (70 * 4+42 * 160)=7.7KVA, former input capacity 1.1 * 80 * 160=14.1KVA than identical floating voltage has reduced about 45%, reduced about 33.6% than existing welding machine input capacity 1.1 * 66 * 160=11.6KVA, reduced 27.4% than energy-conservation welding machine input capacity 1.1 * 60 * 160=10.6KVA.The consumption of transformer copper iron also reduces thus, and the welding machine gross weight is reduced to 52kg from 74kg, and volume has also reduced 1/3.

Be used for the WSM-160 dc pulse tig welding machine, Lv winding parameter and NSA-160 is same, and the LA winding voltage is 32V, Uz=30V, and input capacity is reduced to 1.1 * (72 * 4+32 * 160)=6KVA from 11.6KVA, and volume has reduced 1/2.

Claims

The input power supply is to adopt three-phase or single-phase, output current regulative mode and decline external characteristics acquisition mode are to adopt controllable silicon formula or moving core type or metal rectifier welding set tapped or saturable reactor formula or magnetic amplifier, it is characterized in that: the welding machine output loop is composed in parallel after the rectification respectively by a cover stabilising arc winding and a cover main winding, wherein the rectification of stabilising arc winding is after the electric resistance partial pressure current limliting, the stabilising arc electric current of output 2～12A, the DC voltage of disregarding capacitance boost after the main winding full-wave rectification is no more than 55V.