DE2333456C3 - 10/20/72 Japan 105653-72 Process for automatic arc joint fusion welding with a consumable electrode in the welding joint - Google Patents

Description

with a melting point of not lower than: 1500 ° C.

14. The method according to claim 13, characterized in that the outer insulating sleeve 20 bi; Contains 60% MgO, 5 to 30% CaO and 5 to 30% Al _{2 O.}

15. The method according to claim 5, characterized in that that the welding powder part (6 ') lying under the electrode is premelted unc a melting point of at most 1250 C hai (Fig. 3).

16. The method according to claim 15, characterized in that the welding powder contains 10 to 25% SiO ,, 5 to 20% CaO and 30 to 80% CaF ₂

17. ' Method according to claim 1, characterized in that that as a support door the weld bac of the root layer is a metal rail (5) with ananorean Fiber covering is used, dei a "groove you have excessive roots (F ic 3.17a).

18. The method according to claim 17, characterized in that that when welding double transverse seams on both sides of the standing wall (1.1) support rails (5) are arranged (Fig. La. 2, 15, 17b).

19. The method according to claim 18, characterized in that that the support rails (5) are recessed in their upper area on the seam side (Fig. La, 2, 15. 17b).

20. The method according to claim 5, characterized in that that for welding a tub seam with a V-joint an electrode with an oval cross-section is inserted upright into the welding joint and that the outer insulating sleeve (2) of the electrode has a higher melting point than the welding powder (6) above the electrode (Fig. 3).

The invention relates to a method for automatic Arc joint fusion welder of metals with a horizontal weld seam, in which in the horizontally running weld joint a melting electrode, which is made of a metallic Core wire, a metallic Hüllrohi and an outer insulating sheath is inserted

The well-known welding process with elec electrodes that are inserted into the weld joint and then melt automatically (e.g. US-PS 35 15 846) it has become possible to automate the welding work with relatively little effort With this method, however, no larger joint cross-sections through a single weld layer be filled, as the electrode melting speed is always the same as the welding speed so it cannot be increased in relation to it. There; is so far only by means of arc fusion welding processes have been possible to work with a rising, forcibly formed weld pool, such as through the Elck tro-slag welding (e.g. US-PS 33 25 619). the but on the other hand are not suitable for horizontal welds.

The invention has set itself the task of scales right butt seams both as tub seams and as transverse seams (belt seams. 3 o'clock seams) also be

Larger sheet thicknesses in a single pass αϊ welding while maintaining the low machine Expenditure of welding with electrodes lying in the welding tea.

The inventive method consists in that jum welding of horizontal butt welds lying and standing wall an electrode is used, through the cladding tube of the core wire is continuously fed to the arc.

Electrodes have already become known. may be> o advanced through the hollow core of a abschme'.zender electrode wire (z. B. US-PS i \ ~>] 693), however, these electrodes are guided at right angles to the weld axis. For this purpose, a driving and guiding device for the electrode is required, which according to the method according to the invention

required, the na gg

ren is dispensable. In this known case, too, a larger weld pool cannot advance be prevented so that larger joint transverse tendons need to be filled with several layers.

In the known methods of welding with electrodes lying in the joint (/. B. US-PS 35 15 846) is / was the weld pool due to the light beam pressure prevented from advancing, but here the size of the weld pool is limited by the fact that Wheat the solid core wire of the electrode on a certain seam length only the same electrode length • can melt.

The essence of the method according to the invention, however, is that by the movable Core wire of the electrode per unit of the near length melting wire length can be dug freely and that by the arc pressure acting in the direction of the seam the weld pool is dammed back so that larger joint cross-sections in horizontal Location can be filled with one passage. A useful embodiment of the invention The method consists in that several parallel electrodes are used to fill the joint cross-section be used. It can also be beneficial. the cross-section of the electrode to the joint cross-section adapt.

Further expedient developments of the method according to the invention are the subject of the subclaims 4 to 20.

The invention is described below with reference to! the drawings explained in more detail. Show it

Fi u. La, Ib cross and longitudinal section of an embodiment of the invention and

F "it». 2 to 17 cross-sections of further embodiments the invention.

Corresponding parts are given corresponding reference numbers in the drawings; so The reference number 1 denotes the workpieces to be welded, 2 an insulating material. 3 a consumable electrode, 4 a core wire, 5 a support rail and 6 a welding powder.

According to FIG. 1 I are the workpieces to be welded, furthermore 5 the support rails arranged on opposite ropes of the weld seam. In the ho A consumable electrode 3 with an insulating sleeve 2 is inserted into the welding joint. The insulating sleeve 2 is in Welding powder 6 embedded. The wire drawn through the hollow core of the consumable electrode primarily delivers the Schwcißgul: it can Large amount of deposited metal can be provided when running the wire at a high speed 7iii is carried out.

The welding powder (6, 6 ') should face the weld pool shield the atmosphere. In addition, a protective gas from the wire or the Welding powder can be generated.

Any type of welding flux (burned, melted, agglomerated) can be used. It usually consists of slag-forming substances such as quartz. Magnesia, Aluminum Oxide, Titanium Dioxide and; or deoxidizing agents such as ferrosilicon. Ferromanganese and metal powder.

The cladding tube 3 of the electrode serves as a guide for the core wire 4; it may be circular in cross-section. ' be elliptical, square, triangular or similar. The use of steel for the cladding tube is preferred so that it contributes to the weld deposit as it melts.

The insulating sheath 2 serves to prevent the electrode from coming into contact with the welding groove and can be a twisted glass fiber strip or it can be coated with a welding agent, as is used for manual electrodes. Preferably, the insulating material should have over 30% metallic ovules with a melting point of over 15 (X) C. 20 to 60% MgO. 5 to 30% CaO and 5 to 30% Al ₂ O. The cross-sectional shape of the insulating sleeve can be circular, elliptical, square, triangular or trapezoidal, according to the shape of the welding groove. being. While in FIG. 1 shows an I-shaped weld groove. For example, the cross-sections of such weld grooves can also have the shape of a V. Halb-V according to the shape of the electrodes. U and X have.

The support rail 5 prevents it from flowing out the melt and forms the seam root.

F i g. 3 shows an embodiment of the present Invention, in which an electrode of oval cross-section lies within a V-shaped welding groove. the The welding groove is filled with a welding powder6. In addition to the one provided above the nozzle Welding flux6 can add another welding flux6 ' with a lower melting point fill the space under the electrode. Here the electrode should preferably be coated with an insulating material that has a higher melting point than that above the electrode Has filled welding powder.

In addition, the welding powder should preferably be of the melt type and have a melting point of less than 1250 ° C. and 10 to 25% SiO. Contain 5 to 20% CaO and 30 to 80% CaF _2. F i g. Figure 4 shows another embodiment of the arc welding process of the present invention wherein an electrode is inserted into an inverted V-shaped weld groove. A sleeve 5 is located under the weld seam and a welding powder 6 is located on the rear side.

The F i g. 5 and 6 show an embodiment with a different number of electrodes in the welding seams (according to FIG. 7 three electrodes in the upper and one electrode in the lower welding groove. As shown in FIGS. 10, 11, 13 and 14. the cross-section of the electrode can be rectangular, longitudinal

ann the cross-section of the g

Lich be round, triangular or sector-like, to maintain a constant distance between the weld seams and the electrode. The arrangement prevents an unwelded zone remaining in the weld groove.

The cross section of the core wire can be circular, while the cross section of the sheath tube can be oval.

can be circular or rectangular. on the other hand the outer shape of the electrode can be circular. while the cross-section of the core beam is rectangular, is oval or circular.

The cladding tube can be compared to the core wire according to FIG. 17 and 18 be offset so that the arc can graze directed to certain areas of the joint.

The ratio of the large to the small diameter of an oval or rectangular cross-section is preferably 1.1 to 5.0: 1.

FIGS. 12 and 13 show further embodiments the invention. In Fig. 12 is a cladding tube 3 with triangular cross-section in a V-shaped

Welding zero used, the cladding tube of insulating material 2 is surrounded. The cross section of the core wire 4 is rectangular. F i g. 1 3 shows a weld zero with half-V cross section. a cladding tube 3 mil provided a right-angled-triangular cross-section corresponding to the cross-section of the welding groove is. The cross section of the wire also has a corresponding configuration. The one from a nozzle according to Fig. 14 generated arc prevents the occurrence an unwelded zone in the weld groove. Below are the numerous embodiments of the arc welding process after the previous one Invention: tabulated:

Embodiment I mm thick Copper mm outside. Well circular Execution room 2 Mild steel, Aiis form of management 3 Gas, wire, 2.4 0 Gap of 2 mm material with a material, melting Steel type Mild steel. 12th "1" with a scout Underlay material 4 mm inner diameter 52 kg / mm ² Mild steel. 19 mm thick 25 mm thick Mild steel. 25 mm thick Nut! Water-cooled) typflux Weld groove shape from ! 2 mm (water-cooled) coated, 50 "V" with a gap 60 "X" with a spall Wire with high slag formation of fabric. 500A Steel nozzle of 4 mm of 2 mm Manganese content, 2.40 Core wire gasless wire. 2.40 2mm thick 300 cm / min composite CO-- Welding wire (2.40) for Design 4 Welding wire. 3.2 0 Submerged arc welding flexible pad - copper pad - flexible pad Welding powder Melt type c 2mm thick. 8th The appearance of the sweat is excellent Mild steel, Sintered type bound type with material Caterpillar 12 mm thick Iron powder hall Underlay material I 10 inclined 60 ^c "V" with a 12 inclined aluminum curved, inclined and X-ray inspection not a bug Gap of 3 mm Underlay painting graded copper un Charpy notch toughness OC. 8kgm underlay material insulating material Flexibility gasless sweat Glass tubes, 2 mm thick Covering material tensile strenght wire, 2.40 mainly made of MgO. Trapezoidal coating electrode Copper underground 2mm thick. 8 mm outer. 2mm thick. 4 mm inside material with 2 mm 4 mm inner diameter diameter, triangular deep groove (water Cladding tube, two at a time Welding current Steel type chilled) 500 A 500 A Wire feed 410 cm / min 200 cm / min speed Weld groove shape Well gill Core wire no mistake no mistake 0 C. 5.2 kgm 0 C. 6.5 kgm Well Well document 46 kg / mnr 49 kg / mm ² material Fiberglass and flux ent see Fig. 2 holding, flexible under layer material, steel product Embodiment 5 Embodiment 6 Embodiment 7 Mild steel, Mild steel, 19 mm thick 25 mm thick »U«, 20 \ r: = 3 mm, 70 "X" with a 60 ° "X" with a R = 25 mm Gap of 2 mm Gap 2 mm composite gasless welding Wire. CO ₂ 3.20 "

location

Filling form 4 embodiment

Embodiment 6 Embodiment 7

soliermalerial Coating off Glass hoops 2 mm Coating 2 mm Coating, be a slag picture thick thick, same gas standing essentially the material, the loose welding wire made of MgO. same gasless (circular) Trapezoidal type coating Welding wire (circle shaped) electrode 4 mm inside, 8 mm 4 mm inside, 8 mm 4 mm inside, 8 mm 2mm thick. 4 mm Outer diameter, Outer diameter. Outside diameter. Inside diameter. 3 mm thick. steel 2mm thick. steel 2mm thick. steel triangular nozzle. 2 nozzle, 2 Welding current 500 A 500A 500A 500 A Wire feeder 300 cm / min 400 cm / min 310 cm / mi η 300 cm / min speed Appearance of Well Well Well Well Weld bead X-ray no mistake no mistake no mistake no mistake test Charpy 0 C. 8.3 kgm 0 C. 7.1 kgm 0 C. 6.7 kgm 0 C. 6.9 kgm Notch toughness Flexibility Well Well Well Well tensile strenght 54 kg / mm ² 49 kg / mm ² 51 kg / mnr 52 kg / mnr see fig. 7th see Fig. 8th see fig. 9 see Fig. 10

Embodiment 8 embodiment

Welding in a horizontal position

Steel type

Weld groove shape

electrode

insulating material

Document material

Mild steel, 25 mm thick "I", gap 10 mm elongated round type, vertical diameter 7 mm. Horizontal diameter 26 mm. Wall thickness 2 mm, steel nozzle 1.2 mm thick. 20 mm wide, right-angled wire with a high manganese content. Coating essentially of MgO melt type

Copper plate with groove

Mild steel, 16 mm thick
"I". Gap! 0 mm
right angle steel nozzle,
Vertical length 7 mm.
Horizontal length 15 mm,
with a circular
Core area in the center
2.4 mm0 (Mn content)

Glass strips. 1 mm thick

Deoxidizer, containing sintered typflux copper plate

Welding current 500A For this 3 600A Welding voltage 24 V 27 V Welding speed 7 cm / min 10 cm / min Appearance of sweat Well Well Caterpillar
X-ray inspection no mistake along the no mistake Welding line Flexibility Well Well Charpy notch toughness O ⁰ C, 9.3 kgm O ⁰ C, 6.4 kgm tensile strenght 48 kg / mm ² 51 kg / nwn ² Sheet drawings

Embodiment 10 welding in flat position

Mild steel. 19 mm thick 45 "V"

outside: equilateral triangle. Vertex angle 45 ^r . Height 14mm: inside: apex angle 45 \ height 7 mm

Apex angle 45 \ height 4 mm. triangular wire (low manganese

Coating containing deoxidizing agents

Flux containing deoxidizing agents

flexible underlay material 550A 28 V

8 cm / min Well

no mistake

Well

O ⁰ C, 5.8 kgm

47 kg / mm ²

£ 09 £

Claims (13)

Claims: 23 1. Process for automatic arc joint fusion welding of metals with a horizontally running weld seam, in which a weld joint that melts in the horizontally running weld seam Electrode consisting of a metallic core wire, a metallic cladding tube and an outer insulating sleeve is inserted, characterized in that for An electrode is used to weld horizontal butt welds on lying and standing walls is, through the cladding tube (3) of the core wire (4) continuously fed to the arc will. 2. The method according to claim 1, characterized in that to fill the joint cross-section | several parallel electrodes can be used (Figs. 2, 5, 6. 10). 3. The method according to claim 1, characterized in that that the cross-section of the electrode is adapted to the joint cross-section (Fit>. 2. 10. 11, 12, 13, 14, 15, 17a, 17b). 4. The method according to claim 1, characterized in that that the insulating sheath (2) is arranged eccentrically to the core wire (4) (Fig. 16b, 16c, 16d. 17a. 17b). 5. The method according to claim 1, characterized in that a welding powder layer under the electrode (6 '} with a lower one, on the electrode a welding powder layer (6) with a higher one Melting point is (Fig. 3). 6. The method according to claim 3, characterized in that for welding an X-Nahl in an electrode with a triangular cross-section is inserted into each half of the joint. 7. The method according to claim 3, characterized in that one for welding a V-seam Electrode of triangular cross-section is inserted into the weld joint. 8. The method according to claim 3, characterized in that that for welding an I-seam an electrode rectangular (Fig. 11, 14, 15) or oval (Fig. 3, 16a to 16d, 17a, 17b) cross-section is inserted into the weld joint. 9. The method according to claim 8, characterized in that the length ratio of the long Axis to the short axis of the electrode cross-section is 1.1 to 5.0: 1. 10. The method according to claim 1, characterized in that that the core wire (4) is a solid wire or a conventional submerged arc welding Is useful gas forming composite wire. 11. The method according to claim 5, characterized in that that the welding powder (6 .. 6 ') consists of slag-forming substances such as quartz sand. Magnesium oxide, Aluminum oxide, titanium dioxide and / or from deoxidizing agents like ferrosilicon. Ferromanganese and / or metal powder is composed. 12. The method according to claim 11, characterized in that the welding powder 5 to 2.5% SiO ₂ . 5 to 40% TiO ,, 30 to 70% CaF ₂ , under 15% MnO, under 15% "CaO. Under 3% MgO and under 3% Al ₂ O. 13. The method according to claim 1, characterized in that the outer insulating sleeve (2) of the Electrode not less than 30% metallic oxides 456