Anti-brittle process in titanium alloy butt weld welding process

Abstract

The invention discloses an anti-brittle-change process in a titanium alloy butt weld welding process, which comprises the following steps of: performing titanium alloy workpiece alignment, including spot welding of a circumferential weld, arrangement of a protective atmosphere plugging piece, coating of a gas protective film at a weld groove, starting of welding equipment, and implementation of backing welding at the weld groove. By the adoption of the scheme, in the titanium alloy welding process, the amount of protective atmosphere overflowing from the position near a weld joint molten pool is small, the amount of the protective atmosphere is greatly reduced, the problem that masking paper shields welding operators to observe a welding path is solved, and welding operation is more convenient to implement.

Description

Technical Field

[0001] The invention relates to the technical field of titanium alloy welding, and in particular to an anti-embrittlement process in a titanium alloy butt weld welding process. Background Art

[0002] During the titanium alloy welding process, inert gas is required for protection, which includes blocking nitrogen in the air and preventing the titanium alloy weld from absorbing nitrogen and becoming brittle, and the performance deteriorates. Existing document CN116000417A discloses a method for horizontal butt welding of titanium alloy pipes, including: preparing welding materials and welding equipment, the welding equipment includes a welding gun and a protective cover, assembling and positioning the titanium alloy pipe to be welded according to a predetermined assembly gap, filling the assembled and positioned titanium alloy pipe with argon gas, the gas flow rate of argon gas is set to 15-20L / min, the purity of argon gas is 99.999%, and a protective cover is arranged on the outer surface of the titanium alloy pipe to be welded, so that the protective cover covers part or all of the welding area, and the protective cover is provided with argon holes and welding gun holes. The existing document CN112658440B discloses a method for eliminating back excess height when welding small-diameter titanium alloy pipes. The reducer nozzle is connected to the non-bevel end of the pipe of another part to be welded, and masking paper is used to seal the connection between the gas pipe and one of the pipes to be welded, the connection between the gas pipe and the protective gas delivery hose, and the connection between the reducer nozzle and the pipe of another part to be welded.

[0003] In order to prevent the protective atmosphere from overflowing in large quantities during titanium alloy welding, Figure 1 As shown, the above scheme adopts the technology of sealing the joints of the pipe 1 (i.e., the titanium alloy pipe workpiece) with masking paper 11 (i.e., conventional masking paper), usually by directly bonding the masking paper to the outer wall of the workpiece (the pipe walls on both sides of the weld), but its existing problems also include: the amount of protective atmosphere overflowing from the vicinity of the weld molten pool is still large, and it is easy to block the welding operator from observing the welding path (for manual welding of titanium alloys), making it inconvenient to implement welding operations. Summary of the invention

[0004] At least in view of the problems mentioned in the background technology, the present invention aims to provide an anti-embrittlement process during the welding process of titanium alloy butt welds.

[0005] The present invention adopts the following technical solution.

[0006] A titanium alloy butt weld anti-embrittlement process in the welding process, the steps include: Step 1, implementing the titanium alloy pipe workpiece jointing, including the annular weld spot welding; Step 2, inserting two protective atmosphere plugging pieces into the inner cavity of the titanium alloy pipe workpiece, the protective atmosphere plugging pieces are located on both sides of the annular weld, and connecting the air pipes on the protective atmosphere plugging pieces to the air supply system; Step 3, covering the annular weld groove with a gas protective film, and the gas protective film, the groove of the titanium alloy pipe workpiece, and two protective atmosphere sealing parts together form a protective atmosphere chamber; Step 4, start the welding equipment and perform base welding at the groove of the annular weld.

[0007] A second anti-embrittlement process in a titanium alloy butt weld welding process, comprising the following steps: Step 11, performing jointing of the titanium alloy plate-shaped workpiece, including spot welding of the weld seam; Step 12, arranging a protective atmosphere blocking member on the back side of the titanium alloy plate-shaped workpiece, wherein the protective atmosphere blocking member adopts a trough structure, and connecting the air pipe on the protective atmosphere blocking member to the air supply system; Step 13, covering the weld groove with a gas protective film, wherein the gas protective film, the groove of the titanium alloy plate-shaped workpiece, and the protective atmosphere sealing member together form a protective atmosphere chamber; Step 14, start the welding equipment and perform base welding at the weld groove.

[0008] Furthermore, the gas protective film includes adhesive tape 1, adhesive tape 2 and a film tape connected together, adhesive tape 1 and adhesive tape 2 are located on both sides of the film tape, and adhesive tape 1 and adhesive tape 2 are used to bond to the groove slope of the titanium alloy workpiece.

[0009] Preferably, the adhesive tape 1 and the adhesive tape 2 are both masking tapes, and the film tape is paper tape.

[0010] More preferably, in the initial state, the cross section of the gas protection membrane in the width direction is a "V"-shaped structure. Alternatively, in the initial state, the cross section of the gas protection membrane in the width direction is a "W"-shaped structure.

[0011] Furthermore, during the bottom welding process, the film strip bulges outwards in a direction away from the back side of the titanium alloy workpiece.

[0012] Preferably, the film tape has a thickness of 0.05-0.08 mm.

[0013] Preferably, the width of the membrane strip is 1 to 2 times the minimum width of the weld groove.

[0014] Furthermore, a gas recovery pipe is provided outside the weld, and the gas recovery pipe is used to recover the gas and fine particles overflowing from the vicinity of the weld molten pool.

[0015] Beneficial effect: By adopting the scheme of the present invention, during the titanium alloy welding process, the amount of protective atmosphere overflowing from the vicinity of the weld molten pool is very small, which greatly saves the amount of protective atmosphere used. More importantly, it solves the problem of masking paper blocking the welding operator from observing the welding path, making it more convenient to implement welding operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of using masking paper to seal the pipe joint in the prior art; Figure 2 Schematic diagram of the gas protection membrane in the embodiment; Figure 3 This is a schematic diagram of the use of the gas protective film during titanium alloy welding in Example 1; Figure 4 This is a schematic diagram of the use of the gas protective film during titanium alloy welding in Example 2; Figure 5 Schematic diagram of the use status of the gas protective film during titanium alloy welding in Example 3. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figure 2 As shown, the gas protection film 10 used in the embodiment includes an adhesive tape 1 3, an adhesive tape 2 6 and a film tape 4 connected together, the adhesive tape 1 3 and the adhesive tape 2 6 are located on both sides of the film tape 4, and the adhesive tape 1 3 and the adhesive tape 2 6 are used to bond to the groove slope 2 of the titanium alloy workpiece. Among them, the adhesive tape 1 3 and the adhesive tape 2 6 are both made of masking tape, and the film tape 4 is made of paper tape (ordinary thin paper, without adhesive), and the thickness of the film tape 4 is 0.05~0.08mm. Example 1

[0019] Combination Figure 2 and Figure 3 As shown, a titanium alloy butt weld anti-embrittlement process in the welding process includes the following steps: Step 1, after pre-treating the titanium alloy pipe workpiece 1, implement the titanium alloy pipe workpiece 1 jointing, including annular weld spot welding; Step 2, insert two protective atmosphere plugging pieces 8 into the inner cavity of the titanium alloy pipe workpiece 1, the protective atmosphere plugging pieces 8 are located on both sides of the annular weld, and the air pipes 7 on the protective atmosphere plugging pieces 8 are connected to the air supply system; Step 3, covering the annular weld groove with a gas protective film 10, specifically, pasting the adhesive tape 1 3 on the groove slope 2 of one of the titanium alloy pipe workpieces 1, and pasting the adhesive tape 2 6 on the groove slope 2 of the other titanium alloy pipe workpiece 1. After the adhesive tapes are pasted, the film tape 4 is located between the two groove slopes 2, and the gas protective film 10, the groove of the titanium alloy pipe workpiece 1, and the two protective atmosphere sealing parts 8 together constitute a protective atmosphere chamber 9; in this embodiment, the width of the film tape 4 is 1.2 to 1.5 times the minimum value of the weld groove seam width, and the cross section of the gas protective film 10 in its width direction is a "V"-shaped structure; Step 4, start the welding equipment and perform base welding at the groove of the annular weld. Example 2

[0020] Combination Figure 2 and Figure 4 As shown, a titanium alloy butt weld anti-embrittlement process in the welding process includes the following steps: Step 1, after pre-treating the titanium alloy pipe workpiece 1, implement the titanium alloy pipe workpiece 1 jointing, including annular weld spot welding; Step 2, insert two protective atmosphere plugging pieces 8 into the inner cavity of the titanium alloy pipe workpiece 1, the protective atmosphere plugging pieces 8 are located on both sides of the annular weld, and the air pipes 7 on the protective atmosphere plugging pieces 8 are connected to the air supply system; Step 3, covering the annular weld groove with a gas protective film 10, specifically, pasting the adhesive tape 1 3 on the groove slope 2 of one of the titanium alloy pipe workpieces 1, and pasting the adhesive tape 2 6 on the groove slope 2 of the other titanium alloy pipe workpiece 1. After the adhesive tapes are pasted, the film tape 4 is located between the two groove slopes 2, and the gas protective film 10, the groove of the titanium alloy pipe workpiece 1, and the two protective atmosphere sealing parts 8 together constitute a protective atmosphere chamber 9; in this embodiment, the width of the film tape 4 is 1.6 to 2 times the minimum value of the weld groove seam width, and the cross section of the gas protective film 10 in its width direction is a "W"-shaped structure; Step 4, start the welding equipment, and perform the base welding at the annular weld groove. During the base welding process, the film strip 4 bulges outward away from the back side of the titanium alloy workpiece (the posture of the film strip 4 at this time is similar to Figure 4 The middle film belt 4 posture), which is mainly caused by the gas pressure entering the protective atmosphere chamber 9 causing the gas protection film 10 to bulge / protrude outward. Example 3

[0021] Combination Figure 2 and Figure 5 As shown, a titanium alloy butt weld anti-embrittlement process in the welding process includes the following steps: Step 11, performing jointing of the titanium alloy plate-shaped workpiece 12, including spot welding of the weld seam; Step 12, arranging a protective atmosphere blocking member on the back side of the titanium alloy plate-shaped workpiece 12, the protective atmosphere blocking member adopts a slot structure 13, and connecting the air pipe 7 on the protective atmosphere blocking member 8 to the air supply system; Step 13, covering the weld groove with a gas protective film 10, and forming a protective atmosphere chamber 9 by the gas protective film 10, the groove of the titanium alloy plate-shaped workpiece 12, and the protective atmosphere sealing member 8; Step 14, start the welding equipment and perform the base welding at the weld groove; during the base welding process, the film strip 4 bulges outward in the direction away from the back side of the titanium alloy workpiece (the posture of the film strip 4 at this time is similar to Figure 4 Middle membrane with 4 postures). Example 4

[0022] A process for preventing embrittlement during the welding process of a titanium alloy butt weld, referring to implementation 1, implementation 2 or implementation 3, a gas recovery pipe is provided on the outside of the weld, and the gas recovery pipe is used to recover the gas and fine particles overflowing from the vicinity of the weld molten pool (fine particles refer to dust or dust particles generated by the burning of the gas protective film 10, which will overflow with the gas at the front end of the welding gun).

[0023] Comparative Example: Using Figure 1 As shown, the connection of the pipe 1 (ie, the titanium alloy pipe workpiece 1 ) is sealed with masking paper 11 (ie, conventional masking paper), and the masking paper 11 is pasted on the outer wall of the titanium alloy pipe workpiece 1 .

[0024] During the process of performing the base welding, the protective atmosphere entering the protective atmosphere chamber 9 through the gas pipe 7 works together with the protective atmosphere of the welding gun and the drag cover to form an effective protection for the weld pool, thereby preventing the embrittlement of the titanium alloy butt weld during welding. Due to the use of the gas protective film 10 with a specific structure and arrangement in the present invention, the amount of protective atmosphere temporarily stored in the weld gap 5 in the protective atmosphere chamber 9 is very small. During the welding process, as the welding gun moves, the gas overflow port generated by the high temperature burning of the gas protective film 10 near the weld pool is also small, thereby greatly reducing the amount of protective atmosphere overflowing near the weld pool, saving the amount of protective atmosphere. The schemes in Example 1, Example 2 and the comparative example were used to weld titanium alloy pipe welds of the same specifications and the same number. The results showed that the amount of protective atmosphere used in the scheme in Example 1 (referring to the amount of protective atmosphere introduced into the protective atmosphere chamber 9, the same below) was only 0.6 times the amount of protective atmosphere used in the comparative example; the amount of protective atmosphere used in the scheme in Example 2 (referring to the amount of protective atmosphere introduced into the protective atmosphere chamber 9, the same below) was only 0.7 times the amount of protective atmosphere used in the comparative example.

[0025] Since the gas shielding film 10 is built into the groove of the titanium alloy workpiece (between the two groove slopes 2), this cleverly frees up the visual field space, greatly facilitating the welding operator to observe the welding path and making it more convenient to implement the welding operation. During the welding process, since the welding operator observes the molten droplets of the weld pool from above the weld, when the comparative embodiment scheme (i.e., the traditional scheme) is adopted, the area below the masking paper 11 is the visual blind spot. In this case, the welding operator can only rely on his experience and feeling to control the welding path. However, by adopting the scheme of the present invention, the existence of the visual blind spot is completely eliminated, and the welding operator can observe the direction of the weld (mainly the lower part of the weld groove) at a glance, so that the operator can easily and accurately control the welding path.

Claims

1. A titanium alloy butt weld anti-embrittlement process, characterized in that the steps include: Step 1, implementing the titanium alloy pipe workpiece jointing, including the annular weld spot welding; Step 2, inserting two protective atmosphere plugging pieces into the inner cavity of the titanium alloy pipe workpiece, the protective atmosphere plugging pieces are located on both sides of the annular weld, and connecting the air pipes on the protective atmosphere plugging pieces to the air supply system; Step 3, covering the annular weld groove with a gas protective film, and the gas protective film, the groove of the titanium alloy pipe workpiece, and two protective atmosphere sealing parts together form a protective atmosphere chamber; Step 4, start the welding equipment and perform base welding at the groove of the annular weld.

2. A titanium alloy butt weld anti-embrittlement process, characterized in that the steps include: Step 1, performing jointing of titanium alloy plate-shaped workpieces, including spot welding of weld seams; Step 2, arranging a protective atmosphere blocking piece on the back side of the titanium alloy plate-shaped workpiece, wherein the protective atmosphere blocking piece adopts a trough structure, and connecting the air pipe on the protective atmosphere blocking piece to the air supply system; Step 3, covering the weld groove with a gas protective film, and the gas protective film, the groove of the titanium alloy plate-shaped workpiece, and the protective atmosphere sealing member together form a protective atmosphere chamber; Step 4, start the welding equipment and perform base welding at the weld groove.

3. The anti-embrittlement process during the titanium alloy butt weld welding process according to claim 1 or 2, characterized in that: The gas protective film comprises a first adhesive tape, a second adhesive tape and a film tape connected together, wherein the first adhesive tape and the second adhesive tape are located at both sides of the film tape and are used for bonding to the groove slope of the titanium alloy workpiece.

4. The anti-embrittlement process during the titanium alloy butt weld welding process according to claim 3, characterized in that: The adhesive tape 1 and the adhesive tape 2 are both made of masking tape, and the film tape is made of paper tape.

5. The anti-embrittlement process during the titanium alloy butt weld welding process according to claim 3, characterized in that: In the initial state, the cross section of the gas protection membrane in the width direction is a "V"-shaped structure.

6. The anti-embrittlement process during the titanium alloy butt weld welding process according to claim 4, characterized in that: In the initial state, the cross section of the gas protection membrane in the width direction is in a "W" shape.

7. The anti-embrittlement process during the titanium alloy butt weld welding process according to any one of claims 2 to 6, characterized in that: During the root welding process, the film strip bulges outwardly away from the back side of the titanium alloy workpiece.

8. The anti-embrittlement process during the titanium alloy butt weld welding process according to claim 6, characterized in that: The thickness of the membrane tape is 0.05-0.08 mm.

9. The anti-embrittlement process during the titanium alloy butt weld welding process according to claim 8, characterized in that: The width of the membrane strip is 1 to 2 times the minimum value of the weld groove width.

10. The anti-embrittlement process during the titanium alloy butt weld welding process according to claim 9, characterized in that: A gas recovery pipe is arranged outside the weld to recover the gas and fine particles overflowing from the weld molten pool.

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