Titanium alloy electric arc welding method

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

 

The invention relates to automatic welding of reactive metals in inert gas shipped tungsten electrode and can be used in mechanical engineering at welding joints primarily of increased thickness.

It is known that the welding surface arc connections with thickness of more than 6-8 mm use multi-pass welding with different edge preparation welded parts (GOST 8713-70 "Seams welded joints. Automatic and semi-automatic welding").

The disadvantage of this method is the risk of worsening the quality of the weld from oxidation (violated for any reason protection of the weld) the roller surface and the transition of oxides in the weld metal during a subsequent pass. Repeated scraping the surface of the weld before each pass with the subsequent degreasing and drying leads to undesirable increase in the duration of the production process.

Closest to the claimed technical solution adopted for the prototype, is a method of welding titanium alloys immersed tungsten electrode delavau the gap filled with a granular filler material (see SU 1838061 A1, B 23 K 9/167, 30.08.1993).

The disadvantages of this method include the lack of ability of single-pass welding, the thickness of which exceeds before the function for the selected welding equipment (power source).

The claimed invention is directed to expanding the technological capabilities of the welding process submerged tungsten electrode due to the increase in the maximum thickness of the welded parts.

The essence of the claimed invention consists in that in the method of multi-pass automatic arc welding of titanium alloys immersed tungsten electrode delavau gap with using granular filler material, fall asleep before welding in the slit gap, welded edges perform the cut, which in the Assembly of parts with a slit gap is formed in the form of a U-shaped cutting edges with respect to the cutting depth to width of less than 1, the sharp edges cutting round.

In addition, in this way in order to secure the filling of the U-shaped cutting the molten metal of the second and third passages carried out in the same mode with the following ratios N·k≤30 and y=(E+2N)/2,

where H is the depth of the U-shaped cutting, mm;

E - the width of the U-shaped cutting, mm;

k is the shape factor fusion;

y - offset of the tungsten electrode from the axis of the joint, mm

In addition, in this method, the rounding of the edges of the U-shaped cutting carry out corresponding to the cross-sectional shape of the weld during the second and third passes.

The invention poyasnee the Xia drawings, where figure 1 presents the welded edges with V-neck, gathered with slot gap for the case of bilateral welding; figure 2 - implementation of the first passage; figure 3 - execution of the second passage; figure 4 - run third run; figure 5 - the order of execution passes for two-sided welding.

The basic geometrical parameters of cutting edges (E, H and t) depend on the thickness of the welded metal δ and characteristics of the applied welding equipment. The width of the U-shaped cutting E is the sum of the samples on both edges S and the width of the gap-type t. The value of E is chosen equal to the width of the weld (in the top), b - during the second and third passage or with small deviations from b. In the U-shaped cutting greatest danger for a guaranteed penetration are acute angles (shown by the dotted line in figure 1). Therefore, the sharp corners round, and the angle of inclination of the rounding is selected based on the shape factor k or fusion experiment.

Method for automatic arc welding of titanium alloys immersed electrode is as follows. On the welded edges perform in advance so cut that when the Assembly of parts with slot gap is formed in the form of a U-shaped cutting edges with respect to the cutting depth to its width is less than 1. Then slit gap fill granular the data filler material and perform the first pass (figure 2) with a minimum possible value of the shape factor fusion.

If necessary, the surface of the weld after the first pass, cleaned with a wire brush, followed by degreasing and fill the U-shaped cutting granular material of the same composition as in the slit gap, or other chemical composition. In order to secure the penetration of the walls of the cutting and subsequent overlap welding of the second and third passes of the electrode set offset from the axis of intersection of y=(E+2N)/2 (3), and the shape factor fusion k is selected depending on the depth of the sample N by the formula N·k≤30. The shape factor fusion change in the desired direction by changing the geometrical parameters of the tungsten electrode and the magnitude of its penetration. The third passage is carried out on the same mode, and the second (figure 4).

The proposed method of welding using submerged tungsten electrode allows 1.5 times to increase the thickness of the welded metal.

1. The way multi-pass automatic arc welding of titanium alloys immersed tungsten electrode delavau gap with using granular filler material, fall asleep before welding in the slit gap, characterized in that the welded edges perform the cut, which in the Assembly of parts with a slit gap is formed in the form of a U-shaped cutting cu the IOC with regard to the depth of cutting to a width of less than 1, this sharp corners cutting round.

2. The welding method according to claim 1, characterized in that in order to secure the filling of the U-shaped cutting the molten metal of the second and third passages carried out in the same mode with the following ratios: N·k≤30 and y=(E+2N)/2, where H is the depth of the U-shaped cutting, mm; E - width U-shaped cutting, mm; k is the shape factor fusion; y - offset of the tungsten electrode from the axis of the joint, mm

3. The welding method according to claim 1, characterized in that the rounding of the edges of the U-shaped cutting carry out corresponding to the cross-sectional shape of the weld during the second and third passes.



 

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