Compact torch for welding with non-consumable electrode
The invention relates to the field of welding production, namely the small burners and is used for welding structures in remote places. Compact torch for welding with non-consumable electrode consists of a casing, a tube for supplying cooling water and shielding gas, collets for clamping the electrode, the nozzle and the gas lens. Tube for cooling water and shielding gas are located in the same horizontal plane next to each other, and reliable clamping of the electrode is provided by svorachivaniya collet having an outer tapered thread, in case. Thus the supply of protective gas nozzle is made through holes in the collet. This allows you to weld the parts in hard to reach places, and the presence of water cooling allows you to increaseburner capacity. 3 Il.
The invention relates to the field of welding and can be used for welding structures in hard to reach places.
Known burners Ar-10 and the BLOW-300 for welding with a consumable electrode in a protective gas (“Handbook of welding”, Ed. by Sokolova E. C., M., 1962, so 2, S. 386-389). Burners have a body, a water Roux is Oh conical surface, nonconsumable electrode and the nozzle. To obtain a laminar flow of shielding gas nozzle has an elongated shape, and the gas exits through the slots in the collet or holes located around the collet. Collet clamps the electrode due to its involvement in a smooth tapered bore of the housing when navorachivaya on the threaded end of the collet cap.
The disadvantage of this burner is great its height due to the presence of the cap and a long nozzle that does not allow her to use when welding in hard to reach places. In addition, the supply tube protective gas and tubes for cooling water are at different levels, which further increases its height.
Famous torch for arc welding with a consumable electrode in a protective gas (USSR Author's certificate No. 1291425, CL 23 To 9/16), in which the dimensions are reduced through the use of special water-cooled metal nozzle.
The disadvantage of this burner is the impossibility of its use for manual welding due to uninsulated nozzle.
Closest to the technical essence is the burner (USSR Author's certificate No. 1117164, CL 23 To 9/16), which provides increased maneuverability in tight spaces.
Nedostatochnyi its power.
An object of the invention is the combination of high power and reliability of the burner with the possibility of use in welding in hard to reach areas by reducing its size.
The technical result is achieved by the fact that the torch for welding with a consumable electrode in hard to reach places with the body, a tube for supplying shielding gas and cooling water, the collet, nonconsumable electrode, the nozzle and the gas lens, all three tubes are located in the same horizontal plane as the clamping collet is made with an external tapered thread.
In Fig.1 shows a longitudinal section of the burner; Fig.2 - cross section; Fig.3 is a view of the collet from the top.
The burner includes a housing 1, a shirt 2, the cover 3 and the tube 4, 5, 6, the collet 7, a tungsten electrode 10, a ceramic nozzle 11, a gas lens 12, a layer of heat resistant insulation 13. All casing parts are connected by soldering, hard soldering.
The burner works as follows.
In the housing 1 is screwed to the collet 7 having external tapered thread and the slot 9 to ensure the clamping of the electrode. The clamping of the electrode is performed by nose pliers or a special key for the holes 8. The welding current passes through the body and through the collet goes to the electrode 10. For the gas lens 12 enters the nozzle 11. When passing through the gas lens provides laminar flow of shielding gas. Cooling water flows through the tube 4, circulates in the cavity between the body 1 and the jacket 2 and exits through tube 5.
The proposed burner has a small size, which allows welding in confined spaces, while maintaining its high power.
Compact torch for welding in hard to reach places with the body, a tube for supplying a protective gas, the collet, nonconsumable electrode, wherein the burner has a tube for cooling water located in the same horizontal plane with a tube for supplying a protective gas, and the clamping collet is made with an external tapered thread.
FIELD: restoration of parts cast of aluminum alloys with use of fusion welding.
SUBSTANCE: method comprises steps of cutting out flaw containing portion spaced equidistantly by distance (3 - 8)n from boundary of flaw; making insert of deformed aluminum alloy welded with casting alloy of restored part at relation of coefficients of percentage elongation Gd/Gc = 9 - 25, where Gd and Gc coefficients of percentage elongation respectively of deformed and casting aluminum alloys, n - thickness of cast part in restoration zone.
EFFECT: lowered labor consumption at restoring parts of aluminum alloys.
3 dwg, 1 tbl
FIELD: processes for making large-size thick-sheet orthotropic plates of carbon low-alloy steels in different branches of industry, particularly for bridge building.
SUBSTANCE: method comprises steps of relative orienting members of orthotropic plates; tack welding oriented members by means of non-consumable tungsten electrode in mixture of shield gases Ar (95 - 97)% + (3 - 5%) CO2 ; performing automatic continuous-seam welding and then trimming surface of welded seam. It allows simplify method for making welded large-size thick-sheet orthotropic plates of carbon low-alloy steels.
EFFECT: lowered labor consumption, shortened time cycle for making enhanced-quality plates, improved reliability of welded structures.
6 dwg, 1 ex
FIELD: electric arc welding of materials by means of non-melting electrode, namely methods for automatic argon-arc pulse welding of steel tubes.
SUBSTANCE: method comprises steps of preliminarily dressing tube butts and forming annular chamfers on inner surfaces of butts; abutting tubes; moving welded edges relative to electrode by step axial rotation of abutted tubes at revolution number 1 -1.5 rev/min; igniting arc 2 - 5 s before starting rotation of tube in order to heat welded seam zone; performing welding by means of torch inclined to tube axis by angle 60 - 85° relative to vertical line; sustaining electric current intensity in range 110 - 155 A for pulse duration 0.7 - 0.9 s; keeping electric current at pause period in range 10 - 30 A for pulse duration 0.5 - 0.7 s. Overlapping value of welded seam is in range 10 - 25 mm. It allows eliminate cracking of welded seam of tubes at bending samples by angle exceeding 160°.
EFFECT: enhanced quality of welded seam of tubes.
3 dwg, 1 tbl
FIELD: automatic welding increased-thickness joints of titanium alloys in inert gas by means of submerged tungsten electrode.
SUBSTANCE: method comprises steps of forming in welded edges cutout which is in the form of П-shaped dressing of edges at welding parts with slit gap; keeping relation of depth of dressing to its width less than 1; rounding acute angles of dressing; before welding introducing granulated additive material into slit gap and performing first pass at minimally admissible value of shape factor of fusion. In order to provide guaranteed fusion of walls, second and third passes are realized in the same mode. Electrode is placed in such a way that it is shifted relative to butt axis. At double-side welding passes are realized according to next order: first and second passes, then third, fourth and fifth passes.
EFFECT: enlarged manufacturing possibilities of method due to increased limit thickness of welded parts.
3 cl, 5 dwg
FIELD: machine engineering, possibly gas-shield electric arc welding by means of non-consumable electrode.
SUBSTANCE: method comprises steps of alternatively feeding several gases or their mixtures by pulses; at each next pulse feed using gases (gas mixtures) having ionization potentials different in comparison with those of gases or gas mixtures of previous pulse feed; periodically changing electric arc gap simultaneously with gas feed pulses; setting basic voltage of electric arc equal to optimal voltage in medium of gas or gas mixture with minimum ionization potential; setting difference between maximum and minimum voltage values of arc at periods of previous and next pulse feed of gases or gas mixtures in range 1 - 7 V.
EFFECT: enhanced quality of welded joints, possibility for adjusting fusion depth.
1 tbl, 1 ex
FIELD: gas-shield welding process with use of non-consumable electrode, namely torches for such welding.
SUBSTANCE: torch includes body of collet chuck holder. Said body has cylindrical surface near its working end and it is welded to electrically conducting gas conduit. Collet chuck is mounted in body for securing non-consumable electrode. Nozzle has cylindrical surface passing to cone surface and then again passing to cylindrical surface near its working end. Asbestos-cement insulator is arranged on surface of body of collet chuck holder; brass sleeve is put onto said insulator. Insulator is fixed to body by means of pressure ring-splitter having cylindrical surface passing to cone surface with radial openings.
EFFECT: possibility for making small-size torch for welding butts of metallic structures in hard-to-reach places of installation zone.
FIELD: plastic working of metals, namely processes for forming butt welded seams on tubes at making tube studs of U-shaped tube bundles using effect of localized hot plastic deforming of welded seam and near-seam zones.
SUBSTANCE: method comprises steps of preliminarily working tube ends by expanding them from cylinder to cylinder; assembling tubes with use of mandrel and placing intermediate member of additive material between joined end surfaces of end portions of tubes sized by expansion and end surfaces of step ring. Welded seams are formed by argon-arc welding due to melting material of intermediate member at its both sides adjacent to tube ends. The intermediate member is heated up and it is subjected to hot radial squeezing while concentrating its initial deformation in surface layers according to position of ring steps, welded seams and near-seam zones on mandrel for providing size of their outer diameter equal to initial outer diameter of tubes.
EFFECT: improved quality of welded seams.
FIELD: mechanical engineering; argon-arc welding.
SUBSTANCE: invention relates to methods of automatic argon-arc welding of austenitic steel pipes in manufacture of important constructions, such as high-pressure pipes used at nuclear power stations. Proposed method includes mechanical preparation of welding surface zone, veeing edges to miter of 3.0-3.5 mm and subsequent multiple-pass welding with nonconsumable negative electrode using filler wire. Welding edges are veed to miter of 2.7-3.0 mm. Welding at first pass is carried out with heat input of 0.35-0.55 MJ/m by impulse current. Welding at second pass is done with heat input of 0.6-0.86 MJ/m by impulse current at cross oscillations of electrode. Welding at third and subsequent passes is carried out with heat input of 0.62-1.16 MJ/m by steady current with cross oscillations of electrode.
EFFECT: increased capacity art welding and quality of weld joint owing to reduction of intercrystalline cracking of weld joint.
FIELD: mechanical engineering; welding.
SUBSTANCE: invention relates to design of torches for gas-shielded arc-welding by nonconsumable electrode. Proposed head of torch contains chuck with hole for electrode secured in body and gas fed channels, nozzle and partition arranged inside nozzle and formed by pack of gauzes. Gauze partition is made convex relative to welding arc flame. Head is furnished additionally with partition made of pack of gauzes arranged between chuck and gauze convex partition and made concave relative to flame of welding arc. Packs of gauzes are made of stainless steel of 3 to 5 layers. Gauze mesh is 0.3-0.5 mm.
EFFECT: provision of high quality of welding at relatively simple design.
5 cl, 2 dwg
FIELD: technological processes.
SUBSTANCE: invention concerns electric arc welding, particularly method of automatic argon arc welding of overlapping joints of steel pipes by non-melting electrode. The method involves preliminary pipe edge preparation and welding by tilted electrode with pipes rotating against electrode to form weld seam. Axial rotation speed of welded pipes is 0.1-0.8 rpm. Electrode is tilted in two planes: by 50-70 degrees against the article axis and by 60-85 degrees against weld seam plane.
EFFECT: improved quality of weld seams in overlapping joints of steel pipes, reduced hopping during rotation of long-length welded article, reduced cost of welded product.
3 cl, 3 dwg, 1 tbl