Method for welding of flat panels with header pipe

FIELD: technological processes.

SUBSTANCE: invention may be used to make welded header blocks, used, for instance in cooling systems of power transformer vessels. Panels are made with necks in the form of collars. Flat panels are assembled into blocks with their pressing to header pipe, and neck of each panel is welded to it. Neighboring panels are assembled with gap between edges of collars and are welded to header pipe by means of annular overlapping seam with provision of simultaneous fusion of two neighboring collars. After all annular seams are completed, edges of panel block neck collars are welded to header pipe by two longitudinal seams.

EFFECT: invention provides for increased efficiency and production of reliable welded seams without burn-throughs, and also makes it possible to reduce number of annular seams in narrow space between panels and to facilitate monitoring of welding process and visual inspection of overall appearance of welded seams.

3 dwg

 

The invention relates to the welding process, and in particular to methods of welding flat panels with the collector pipe, and can be applied in power in the manufacture of welded manifold blocks used, for example, in cooling systems of buildings power transformers.

Known, for example, the method of welding of flat panels in sections of two or three panels embossed with contact welding on a circle with uniform thick seam (see Ipostel, Wegmarken. "Equipment for continuous combined forming steel panel items" in the magazine "die Forging production", No. 7, 1986, p.25-27).

However, this method is difficult to perform, and when the number of flat panels that are included in the block, more than three and impossible.

Also known is the most common method of welding panels with the collector pipe, which assembles the panels with the Ref rings for the main pipe and welding necks on a path to the pipe (see, for example, techno-commercial offer of the Company "Heinrich Georg GMBH E-37116, 1983, page 1).

The disadvantages of this method is that the flat expanded metal neck panel assumes perform fillet welds on thin wall panel in the closed space between the panels with different orientation of the welding torch on the TAC welding, angular seams require high precision Assembly of panels with a minimum clearance between pipe and mouth to avoid violations of welding and related burnout wall. For manual welding of such joints in the narrow gap between the panels requires high professional skill of the welder. The use of automatic welding process perform welds in different orientation of the welding torch involves the use of fairly sophisticated tracking devices in the direction of the torch along the seam and accurate adjustment of the welding current in the welding process, depending on the spatial position of the welding torch. A failure in the welding mode or the tracking mode often leads to defects in welds and causes the need to repair defects in the seams hand-jelly, which reduces the overall performance of the production manifold blocks and buildings power transformers in General.

Increasing the production of transformers in sealed enclosures with flat hinged coolers in the form of panels connected to two collector pipes requires simplify the design of welding torches and tracking systems for the direction of the seam, as well as reducing the number of girth welds performed in a narrow space between the panes.

The technical result of the invention is to p is improving the quality of welds and simplification of the action when you receive them, increasing productivity in the production of manifold blocks.

The above effect is achieved by the fact that when welding flat panels with the collector pipe, including the preparation of flat panels by pressing them to the main pipe and welding the flanged cap to the main pipe, it is suggested collected clearance necks collars of adjacent panels to weld with a collector pipe one annular seam, and then after all of girth welds on the collector pipe, two longitudinal seams to be welded to the main pipe edge collars necks panels.

The result is, if you use panels with openings in the form of collars, the inner diameter of the semicircle which would correspond to the external diameter of the collector tube, and the edges of collars are parallel to the side planes of the panels. The height of the collar should not exceed half of the gap between the flanged openings of the panels when assembling them on the main pipe. Neck shaped collar also facilitates the Assembly of the panels in manifold blocks for welding

The inventive method of welding a flat panel with the collector pipe is depicted in figure 1, 2, 3, where

- figure 1 schematically shows a flanged neck with collar, welded to the main pipe,

- figure 2 schematically shows a part of Kollektornaya pipe in the area of welding flanged necks panels

- figure 3 shows a view along arrow a in figure 2.

The inventive method is carried out as follows. Panel 1 collected with two collector pipes 2 on a special stand, stacking piece with a gap between the edges of the collars 3 adjacent panels.

Then the collector pipe 2 to draw the collars panels on both sides and fixed manifold block in a predetermined position passed on welding.

To perform welds using welding in shielding gas with a consumable electrode in the form of a wire, or with non-consumable electrode feed filler wire into the arc zone. The welding torch when performing girth welds shall be sent in the middle of the gap between adjacent panels, while relying on the collector pipe, and welding the longitudinal seams of the leg is the collector pipe.

The optimal gap between the edges of adjacent collars is the distance 3 mm, when the reduction of the gap up to 1 mm can receive lots of incomplete penetration, but with increasing gap in excess of 3 mm to 5 mm to allow for the simultaneous fusion of the two collars with collector pipe will be required oscillation of the welding torch.

First perform all the circular seams 4, then two longitudinal weld seam 5 on one main pipe, then similar operations are performed on the other pipe alektorophobia. It is also possible to simultaneously perform welds on both the collector pipes with two torches.

The implementation of lap welds on the collector pipe with a wall substantially thicker than the thickness of the wall panels, it is much easier to perform fillet welds on thin metal, as the collector pipe prevents burn-through weld and allows the use of forced welding modes with increased welding current.

Thus the application of the proposed method of welding a flat panel with the collector pipe by welding collected with a gap necks collars of adjacent panels one annular seam, and then after all of girth welds on the collector pipe and welding the two longitudinal seams edges of collars necks panels to the main pipe, allows to increase the productivity welding in the manufacture of the collector sides and to obtain reliable welds without burn-through, eliminating the need to repair a marriage manual jelly. Reduce the number of girth welds performed in a narrow space between the panels is simplified tracking system for moving the welding torch, as the basis for the direction of the burner are the side surfaces of the adjacent panels, and forming a collector pipe is facilitated not only by the visuals which control the progress of the welding, but inspection of exterior welds.

A method of manufacturing a manifold block including an Assembly of flat panels in the blocks by pressing them to the main pipe and welded thereto, the neck of each panel, wherein the panels are done with openings in the form of collars, with adjacent panels collect with a gap between the edges of collars and are welded to the main pipe ring lap joint with overlap of fusing two adjacent collars, and after all girth welds the edges of collars manhole block panels are welded to the main pipe two longitudinal seams.



 

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1 tbl, 1 ex

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