CN212946025U - Gas protection device for narrow-gap laser wire filling welding of large-thickness titanium alloy plate - Google Patents
Gas protection device for narrow-gap laser wire filling welding of large-thickness titanium alloy plate Download PDFInfo
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- CN212946025U CN212946025U CN202020967924.XU CN202020967924U CN212946025U CN 212946025 U CN212946025 U CN 212946025U CN 202020967924 U CN202020967924 U CN 202020967924U CN 212946025 U CN212946025 U CN 212946025U
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Abstract
The utility model provides a gas protection device is used in welding of big thickness titanium alloy board narrow gap laser filler wire belongs to welding process technical field. The gas protection device comprises a gas supply copper pipe, and the side wall of the tail end of the gas supply copper pipe is provided with through holes which are bilaterally symmetrical. The utility model discloses a large-thickness titanium alloy plate narrow gap laser is filled wire and is welded with gas protection device, protective gas passes through the gas supply copper pipe and discharges downwards, carries out the omnidirectional protection to the welding molten bath, and protective gas can effectively reduce the turbulent flow in the short distance through the gas supply copper pipe, has improved protective gas flow stiffness and stationarity to can restrain the metal vapour feather brilliance; the welding protective gas forms laminar flow inside the narrow gap slope of the titanium alloy, so that the protection effect is further improved; and the relative position of the end part of the wire feeding nozzle and the air copper pipe is adjustable, and the use is flexible.
Description
Technical Field
The utility model relates to a based on for welding gas protection device is filled out to big thickness titanium alloy plate narrow gap laser belongs to welding process technical field.
Background
Titanium alloys have been produced in recent years on a large scale in the production of nuclear submarines, deep submergence vehicles and other facilities because of their high specific strength, corrosion resistance, good formability and other properties. However, titanium alloy has high chemical activity to gas under high temperature welding conditions, and is easily polluted by air, moisture, grease and the like, so that the reaction of the titanium alloy with oxygen, nitrogen and hydrogen is quickly accelerated, and the plasticity and the toughness of a welding joint are reduced. Titanium has very strong affinity with oxygen, carbon, nitrogen, hydrogen and the like at high temperature, the titanium alloy without gas protection starts to absorb hydrogen at the temperature of more than 300 ℃, starts to absorb oxygen at the temperature of more than 600 ℃, starts to absorb nitrogen at the temperature of more than 700 ℃, and the hydrogen, oxygen and nitrogen gases are absorbed by the titanium alloy to cause embrittlement of a joint, so that the hardness of the welded joint is improved, and the plasticity is seriously reduced.
The melting point of the titanium alloy is above 1668 ℃, which is much higher than the temperature at which the titanium alloy starts to absorb hydrogen, oxygen and nitrogen. In the laser welding process of the titanium alloy, if the protection of a welding molten pool is insufficient, the titanium alloy is easy to react with gases such as hydrogen, oxygen, nitrogen and the like in the air, the hydrogen content in a joint is too high, oxides, nitrides and the like are produced, and the defects such as cracks, air holes and the like are easily formed, so that the welding quality is seriously influenced. Particularly, in the process of welding the titanium alloy with large thickness and narrow gap, single-pass multilayer welding is needed, when the position with large thickness is welded, the position of the side face of the groove reaches high temperature due to heat accumulation, and the side face of the welding seam also needs to be protected by gas.
The titanium alloy has small thermal conductivity which is about 1/4 of nickel, 1/5 of iron and 1/14 of aluminum, and the lower thermal conductivity leads to long high-temperature retention time of a welding joint, so that the contact time of the welding joint and hydrogen, oxygen and nitrogen in air is increased, the probability of generating defects of the welding joint is greatly increased, and the area of a high-temperature heating area is increased by a large-thickness titanium alloy plate, which all increase the difficulty of gas protection in the narrow-gap laser filler wire welding process of the large-thickness titanium alloy plate.
At present, no relevant research on the narrow-gap laser wire-filling welding technology of the TC4 titanium alloy thick plate is seen at home and abroad, especially the research on a gas protection device in the welding process is blank, and the experience for reference and the relevant literature which can be consulted are deficient.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a gas protection device is used in welding of big thickness titanium alloy board narrow gap laser filler wire, has solved at present in big thickness titanium alloy board narrow gap laser filler wire welding field, to the not enough problem of welding molten bath lateral part gas protection.
The gas protection device comprises a gas supply copper pipe, and the side wall of the tail end of the gas supply copper pipe is provided with through holes which are bilaterally symmetrical.
Furthermore, the gas protection device further comprises a universal joint and an adapter plate, wherein the air supply copper pipe is arranged in the adapter plate, and one end of the universal joint is detachably connected with the adapter plate.
Furthermore, the adapter plate is provided with a copper pipe placing groove, and the air supply copper pipe is inserted into the copper pipe placing groove.
Further, the air supply copper pipe is matched with the copper pipe placing groove and clamped in the copper pipe placing groove when in use.
Furthermore, the air supply copper pipe is formed by brazing a plurality of copper pipes side by side.
Furthermore, the hole wall of the through hole on the side wall of the tail end of the air supply copper pipe is horizontally arranged.
Furthermore, the hole wall of the through hole on the side wall of the tail end of the air supply copper pipe is provided with a slope.
Furthermore, in the air supply copper pipe, the outer diameter of each copper pipe is not more than 4 mm.
The utility model has the main advantages that: the utility model discloses a large-thickness titanium alloy plate narrow gap laser is filled wire and is welded with gas protection device, protective gas passes through the gas supply copper pipe and discharges downwards, carries out the omnidirectional protection to the welding molten bath, and protective gas can effectively reduce the turbulent flow in the short distance through the gas supply copper pipe, has improved the protective gas flow stiffness, and can restrain the metal vapour feather brilliance; the welding protective gas forms laminar flow inside the narrow gap slope of the titanium alloy, so that the protection effect is further improved; and the relative position of the welding head and the vent copper pipe is adjustable, and the use is flexible.
Drawings
FIG. 1 is a schematic view of the overall structure of a gas-shielded apparatus for narrow gap laser filler wire welding of a large-thickness titanium alloy plate according to the present invention;
FIG. 2 is a top view of the plenum copper tube of FIG. 1;
FIG. 3 is a schematic view of a weld joint bevel.
Wherein, 1 is the universal joint, 2 is the keysets, 3 is the air feed copper pipe, and 4 are the bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, the gas protection device for narrow gap laser filler wire welding of the large-thickness titanium alloy plate comprises a gas supply copper pipe 3, and the side wall of the tail end of the gas supply copper pipe 3 is provided with bilaterally symmetrical through holes.
Specifically, the air supply copper pipes 3 are in an array form, and can be connected together before use or can be respectively inserted into the adapter plate 2. When in use, the protective gas is inserted into the gap and is sprayed out through the through holes arranged on the air supply copper pipe 3 and the tail end of the air supply copper pipe 3, in the embodiment, 3 pairs of through holes are arranged on the side wall, and in other embodiments, the number of the through holes on the side wall can be increased or decreased as required.
The gas protection device further comprises a universal joint 1 and an adapter plate 2, the air supply copper pipe 3 is arranged in the adapter plate 2, and one end of the universal joint 1 is detachably connected with the adapter plate 2.
Specifically, universal joint 1 and keysets 2 pass through bolt 4 fixed connection and be in the same place, and welding robot is connected to the other end of universal joint 1, and universal joint 1 makes the relative position of air feed copper pipe 3 and bonding tool adjustable at any time, has further improved the convenience of using.
The adapter plate 2 is provided with a copper pipe placing groove, and the air supply copper pipe 3 is inserted in the copper pipe placing groove.
The air supply copper pipe 3 is matched with the copper pipe placing groove and is clamped in the copper pipe placing groove when in use.
Specifically, the air supply copper pipe 3 can be clamped in the copper pipe placing groove through the matching of the size, and the air supply copper pipe 3 and the adapter plate 2 can be detached at any time when not in use, so that the storage and the transportation are convenient. The air supply copper pipe 3 can also be directly fixed in the copper pipe placing groove by brazing, and the specific operation is determined according to the situation.
The air supply copper pipe 3 is formed by brazing a plurality of copper pipes side by side.
Specifically, the air supply copper pipes 3 may be welded in a row and then inserted into the copper pipe placing grooves, or placed into the copper pipe placing grooves one by one, depending on whether the copper pipe placing grooves are matched with the air supply copper pipes 3 integrated in a row or have a plurality of holes matched with a single copper pipe.
The hole wall of the through hole on the side wall of the tail end of the air supply copper pipe 3 is horizontally arranged.
The hole wall of the through hole on the side wall of the tail end of the air feed copper pipe 3 is provided with a slope.
Specifically, the wall of the through hole can be selected in a gradient manner according to the requirement of the gap so as to adjust the spraying range of the shielding gas, but the shielding gas can cover the whole welding pool in any adjustment way as a first criterion.
In the air supply copper pipe 3, the outer diameter of each copper pipe is not more than 4 mm.
The following is a specific embodiment:
as shown in fig. 3, fig. 3 is a schematic diagram of a groove of a large-thickness narrow-gap laser filler wire welding head, wherein the specification of a titanium alloy plate is 300 × 150 × 60mm, the truncated edge of the groove is 4mm, the groove gap is 4.3mm, and the groove angle is 2 °. The laser wire filling welding system comprises a Kuka robot, a Venice wire feeding device, a YLS-30000 solid laser manufactured by Germany IPG company, a focal length of 460mm, an output wavelength of 1.06 mu m, a minimum light spot diameter of 0.66mm and a maximum output power of 30 kW. Adopt continuous laser output mode, light silk interval d is 3mm, and laser power is 3.5kW, and defocusing volume Δ f is +10mm, and welding speed is 1.5m/min, and wire feed speed is 3.0m/min, and when experimental mode welding that adopts laser front-end adopted, adopted the utility model discloses a device carries out the oxidation that gas protection avoided the welding molten bath, and protective gas is pure argon gas, and the air flow is 30L/min. And fixing the welding test piece by using a clamp on the test platform.
Can discover from the vertical macroscopic view appearance of welded joint, the welding seam tissue is the column crystal, and welded joint does not have not fuse, gas pocket and presss from both sides welding defects such as sediment, explains the utility model discloses a welding protective gas device reasonable in design, the science.
Claims (6)
1. The gas protection device for the narrow-gap laser filler wire welding of the large-thickness titanium alloy plate is characterized by comprising a gas supply copper pipe (3), wherein the side wall of the tail end of the gas supply copper pipe (3) is provided with through holes which are bilaterally symmetrical,
the gas protection device also comprises a universal joint (1) and an adapter plate (2), the gas supply copper pipe (3) is arranged in the adapter plate (2), one end of the universal joint (1) is detachably connected with the adapter plate (2),
the adapter plate (2) is provided with a copper pipe placing groove, and the air supply copper pipe (3) is inserted into the copper pipe placing groove.
2. The gas protecting device for narrow-gap laser filler wire welding of the large-thickness titanium alloy plate as claimed in claim 1, wherein the gas-feeding copper pipe (3) is matched with the copper pipe placing groove and clamped in the copper pipe placing groove in use.
3. The gas protecting device for laser filler wire welding of narrow gap of large thickness titanium alloy plate according to claim 2, characterized in that said gas feeding copper pipe (3) is composed of a plurality of copper pipes brazed together side by side.
4. The gas protecting device for the narrow-gap laser filler wire welding of the large-thickness titanium alloy plate as claimed in claim 3, wherein the wall of the through hole of the side wall of the tail end of the air supply copper pipe (3) is horizontally arranged.
5. The gas protecting device for narrow gap laser filler wire welding of the large-thickness titanium alloy plate as claimed in claim 4, wherein the wall of the through hole of the side wall of the tail end of the air feed copper pipe (3) is provided with a slope.
6. The gas protecting device for narrow gap laser filler wire welding of large thickness titanium alloy plates according to any one of claims 1 to 5, wherein the outer diameter of each copper pipe in the gas feeding copper pipe (3) is not more than 4 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020967924.XU CN212946025U (en) | 2020-06-01 | 2020-06-01 | Gas protection device for narrow-gap laser wire filling welding of large-thickness titanium alloy plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020967924.XU CN212946025U (en) | 2020-06-01 | 2020-06-01 | Gas protection device for narrow-gap laser wire filling welding of large-thickness titanium alloy plate |
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| CN212946025U true CN212946025U (en) | 2021-04-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113245701A (en) * | 2021-04-14 | 2021-08-13 | 哈尔滨焊接研究院有限公司 | Method and device for reducing stress and deformation of narrow-gap laser filler wire welding head of titanium alloy thick plate |
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2020
- 2020-06-01 CN CN202020967924.XU patent/CN212946025U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113245701A (en) * | 2021-04-14 | 2021-08-13 | 哈尔滨焊接研究院有限公司 | Method and device for reducing stress and deformation of narrow-gap laser filler wire welding head of titanium alloy thick plate |
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