SU522927A1

SU522927A1 - Method of two-arc automatic welding

Info

Publication number: SU522927A1
Application number: SU2052869A
Authority: SU
Inventors: Валентин Максимович Лебедев; Евгений Владимирович Сивицкий
Priority date: 1974-08-13
Filing date: 1974-08-13
Publication date: 1976-07-30

Description

1one

Изобретение относитс к области машиностроени и может быть использовано при автоматической сварке различных металлоконструкций , детали которых соедин ютс между собой электродуговой сваркой.The invention relates to the field of mechanical engineering and can be used in the automatic welding of various metal structures, the details of which are interconnected by electric arc welding.

В сварочном производстве с целью повышени производительности примен ют многоэЛектродную или многодуговую, в том числе и двухдуговую сварку.In welding production, in order to increase productivity, multielectrode or multi-arc welding, including two-arc welding, is used.

Известен способ миогол.утовой автоматической сварки изделий мерной длины.The known method myogolutovoy automatic welding of products of measured length.

По известному способу изделие разбивают на участки, в каждом из которых, за исключением двух Крайних, размещают по два сварочных электрода и после возбуждени дуги развод т их в противоположные стороны до встречи с электродом р дом расположенного участка, а два крайних электрода перемещают до конца издели . При этом производительность сварки по сравнению € однодуговой возрастает во столько раз, сколько используетс электродов.By a known method, the product is divided into areas, in each of which, with the exception of two Extreme ones, two welding electrodes are placed and, after initiating the arc, they are separated in opposite directions before meeting the electrode near the located area, and the two extreme electrodes are moved to the end of the product . At the same time, the productivity of welding, as compared to a single-arc one, increases as many times as the electrodes are used.

При сварке по известному способу в начале участков швов, где возбуждаютс дуги между р дом расположенными электродами и изделием, и в конце участков швов, где встречаютс противоположно расположенные электроды, остаютс непроваренные участки швов, размещенные между электродами. Некачественный обгций шов получаетс также в When welding by a known method, at the beginning of the seams, where arcs are excited between a number of spaced electrodes and the product, and at the end of the seams, where oppositely located electrodes meet, there are uncooked seams of the seams between the electrodes. Poor quality seam is also obtained in

св зи с неодновреМеннОСтью возбуждени всех дуг.connection with non-uniformity of excitation of all arcs.

Целью изобретени вл етс создание способа двухдуговой автоматической сварки, обеспечивающего получение качественного шва по всей его длине.The aim of the invention is to create a method of two-arc automatic welding, which provides high-quality weld along its entire length.

Поставленна цель достигаетс тем, что над серединой участка шва возбуждают дугу между двум неплав щимис электродами, ВКлюченными в сварочную цепь одного источника тока последовательно. Данной дугой образуют на изделии ванну жидкого металла, после чего в зону дуги подают два плав щихс электрода, на которые переходит дуга с неплав щихс электродов. Последние отвод т от зоны сварки. Плав щиес электроды развод т в противоположные стороны вдоль линии шва, расщепл дугу, гор щую между ними, на две дуги, гор щие между каждым из плав щихс электродов и изделием, и одновременно повыша напр жение в сварочной цепи. Путем перемещени дуг от середины участка щва к его кра м осуществл ют сварку издели .The goal is achieved by the fact that over the middle of the seam section, an arc is excited between two non-melting electrodes that are connected to the welding circuit of one current source in series. This arc forms on the product a bath of liquid metal, after which two melting electrodes are fed into the arc zone, to which the arc passes from non-melting electrodes. The latter are retracted from the weld zone. The melting electrodes are spread in opposite directions along the seam line, splitting the arc burning between them into two arcs burning between each of the melting electrodes and the product, and at the same time increasing the voltage in the welding circuit. By moving the arcs from the middle of the groove area to its edges, the product is welded.

Предлагаемый способ иллюстрируетс чертежом .The proposed method is illustrated in the drawing.

Claims

One pair of electrodes, consisting of non-melting 1 and melting 2 electrodes, is connected through one current pole 3 to one pole of current source 4, and the second pair of electrodes via current lead 5 to another pole of the same current source 4. Arrows A shows the direction of movement of the melting electrodes to the arc excitation arc 6 between the heating electrodes and the direction of formation of a liquid Mbtal bath 7 on the product 7, arrows B showing the direction of the melting electrodes after feeding the melting electrodes. The direction of welding is indicated by arrows B. The method is carried out as follows. Above the middle of the weld there are two welding heads equipped with each melting 2 and non-melting 1 electrodes and is connected in series in the welding circuit of only one current source 4. In the direction opposite to arrows B, two non-melting electrodes 1 are fed to the middle of the seam of the head at an angle to product 7 and to each other. Between the non-consumable electrodes 1, an arc -6 is excited, fed from one current source 4. A warm arc 6 melts the middle of the seam section, creating a bath of liquid metal. Then, in the direction of combustion of the arc 6 in the direction indicated by arrows A, the heads feed two melting electrodes 2, which close the welding circuit of the current source 4 through itself, i.e., arc 6 is excited between them, and burning electrodes 1, the arc 6 is terminated. Non-melting electrodes with 1 heads are retracted from the welding zone in the direction of arrows B. As the head melts, melted electrodes 2 are fed down. 35 The molten electrode metal fills the bath on the product 7. The welding heads begin to dissolve in opposite directions along the weld axis, the direction indicated by arrows B while simultaneously increasing 40 the voltage across the arc 6. The arc 6 between the electrodes 2 and the arc 6 split into two arcs burning between each of the electrodes 2 and the product 3. Thus, the welding circuit of the current source 4 closes Without the current lead 3, the electrode 2, the arc, the product 7, the second arc, the second electrode 2, and the conductor 5. By far from moving the welding heads from the middle of the seam to its edges, the product is welded. At the end of welding, the arcing stops and the welding heads are moved to the middle of the seam. The use of the proposed method of dual-arc automatic welding provides the following advantages compared with existing methods: the possibility of obtaining uniform penetration along the entire length of the seam, which improves the quality of the welded joint; increase of welding productivity by 2 times in comparison with single-arc welding and 1.4-1.6 times in comparison with two-arc welding in common or separate baths; elimination of the non-simultaneity of the excitation of two arcs, which also increases the quality of the welded joint, the claims of the method of two-arc automatic welding by placing two rows of arranged melting electrodes fed from one source according to the splitting scheme and diluting them after initiating the arcs and forming a common welding baths in opposite directions along the seam axis, characterized in that, in order to improve the quality of welding, a common weld pool is obtained by means of an independent arc, which A rudder is excited between non-melting electrodes, then transferred to melting electrodes.

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