CN111633302A - Welding method - Google Patents
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- CN111633302A CN111633302A CN202010343120.7A CN202010343120A CN111633302A CN 111633302 A CN111633302 A CN 111633302A CN 202010343120 A CN202010343120 A CN 202010343120A CN 111633302 A CN111633302 A CN 111633302A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/022—Welding by making use of electrode vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention provides a welding method, when two weldments are welded, firstly, a flat welding method is utilized to perform backing welding on the weldments, then a welding gun is reversely held, and the welding gun is moved in an upper sawtooth shape to perform filling welding and/or cover welding. The welding method provided by the invention is suitable for welding the included angle between the end surfaces of two welding parts in a cavity with limited space, which is larger than 90 degrees, and ensures the welding quality of the welding parts. The welding gun is held reversely, so that the visual field can be prevented from being influenced in a cavity with a limited space, and the welding gun can move along the upward sawtooth shape, so that liquid medicine and molten iron can be prevented from flowing downwards when an included angle between the end surfaces of the two welding parts is larger than 90 degrees, and the welding quality is ensured.
Description
Technical Field
The invention relates to the field of welding, in particular to a welding method.
Background
In the internal structures of a motor train unit and a subway, welding with an included angle of more than 90 degrees between the end faces of two welding parts is often carried out in a cavity with limited space, and the limited space brings difficulty to welding operation, so that visual line is possibly blocked, blind welding is needed in partial areas, and welding quality is affected. And because the included angle of the welding seam is an obtuse angle and is larger, the quality of the welding seam is influenced by the condition that liquid medicine possibly flows downwards during welding.
The prior Chinese invention patent discloses a corner butt TIG welding method, relating to the technical field of automatic control of welding, and the corner butt TIG welding method comprises the following steps: the method comprises the following steps of chamfering a workpiece, cleaning before welding, positioning welding, checking and correcting, flat welding, corner welding, heat treatment and welding inspection, meets the requirement of a first-level welding seam of the welded workpiece, ensures high-speed and high-efficiency welding effect, realizes automatic TIG welding of an obtuse-angle sheet, has high welding efficiency and stability, does not have the defects of cracks, undercut, air holes, depressions and the like, and is good in welding one-step forming. The requirement of the primary welding seam of the welding workpiece is met, and the high-speed and high-efficiency welding effect is ensured. The invention provides eight welding steps, but does not provide a welding method aiming at the fact that the included angle between the end faces of two welding parts in a cavity is larger than 90 degrees.
The welding process comprises a) preheating, wherein the preheating adopts an electric heating mode or flame heating, and when the materials of welding joints are different, the preheating temperature is selected according to steel with stronger strength or higher carbon equivalent in the joints; b) welding preparation and welding equipment inspection; c) preparing a welding groove, wherein the welding groove of the high-strength steel is obtained by adopting a machining process method; d) positioning welding; e) assembling a welding joint; f) arranging an arc striking plate, an arc extinguishing plate and a base plate; g) preheating a steel plate before welding; h) welding; i) and (6) welding inspection. The invention provides a welding process of high-performance steel, but also does not provide a welding method for welding two weldment end surfaces with an included angle larger than 90 degrees in a needle cavity.
From the above, there is a need for a welding method suitable for welding two end surfaces of a welding part in a cavity with limited space, wherein the included angle between the end surfaces is greater than 90 degrees, and the welding quality of the welding part is ensured.
The present invention has been made in view of the above problems.
Disclosure of Invention
The invention aims to solve the problem that the quality of a welding part is influenced due to improper welding method when the included angle between the end surfaces of two welding parts is larger than 90 degrees in a cavity with limited space in the prior art. The invention provides a welding method, when two weldments are welded, firstly, a flat welding method is utilized to perform backing welding on the weldments, then a welding gun is reversely held, and the welding gun is moved in an upper sawtooth shape to perform filling welding and/or cover welding.
The welding method provided by the invention is suitable for welding two end faces of a weldment with an included angle larger than 90 degrees in a cavity with limited space, and the welding quality can be ensured by reversely holding the welding gun and moving the welding gun in an upper sawtooth shape for welding.
Further, the operation of welding by the reverse holding welding gun comprises the following steps: firstly, turning a welding gun by 180 degrees relative to an original horizontal standing position, and then holding the welding gun by hand; during welding, the included angle between the nozzle of the welding gun and the horizontal plane is kept between 45 and 60 degrees.
Further, the operation of moving the welding gun in the shape of the upper saw tooth specifically comprises the following steps: when filling welding and/or cover surface welding are carried out, the welding gun nozzle firstly rises from the starting point and then bends and descends to move along the saw-tooth shape.
Further, the welding gun nozzle moves along a saw-tooth shape during filling welding and/or cover surface welding, and the tooth shape of the saw-tooth is an isosceles triangle with the vertex angle of 45 degrees +/-15 degrees. When in welding, the welding gun nozzle moves along the shape, so that the operation is easy, the welding seam is more attractive, and the welding quality of the welding bead can be ensured.
Further, the welding method comprises the following steps:
step S1, cleaning a weld joint area before welding;
step S2, backing welding is carried out on the welding parts by using a flat welding method;
and step S3, reversely holding the welding gun and moving the welding gun in an upper sawtooth shape to perform filling welding and/or cover surface welding.
Furthermore, the width of each welding bead welded along the upper saw tooth shape is controlled within 16mm, and the height difference of each single welding bead is controlled within 2 mm; the temperature between welding layers is controlled within 200 ℃; preferably, the higher position in the single weld is cut by the reamer when the height difference of the single weld exceeds 2 mm. When welding along the upper sawtooth shape, the quality of a welding bead, a welding layer and a welding seam needs to be monitored at any time so as to ensure the welding quality.
Further, when performing the welding of steps S3 and S4, the height difference of each single welding seam should be controlled within 2 mm; preferably, the higher position in the single weld is cut by the reamer when the height difference of the single weld exceeds 2 mm. The fusion of welding layer channels is ensured by controlling the height difference of each single welding line.
Further, when welding is carried out along the upper zigzag, when the number of welding passes is 1-2, carbon dioxide gas shielded welding is adopted, the welding material is JM-55II, the rated current in a welding gun is 250A, the rated voltage is 26V, the welding speed is 7.5mm/s, the heat input is 0.69KJ/mm, a welding piece is connected with the positive electrode of a power supply, and a welding rod is connected with the negative electrode of the power supply.
Further, when welding is carried out along the upper zigzag, when the number of welding passes is more than 3, carbon dioxide gas shielded welding is adopted, the welding material is JM-55II, the rated current in a welding gun is 250A, the rated voltage is 26V, the welding speed is 6mm/s, the heat input is 0.87KJ/mm, a welding piece is connected with the positive electrode of a power supply, and a welding rod is connected with the negative electrode of the power supply.
Furthermore, when backing welding is carried out, the welding part is fixed on a welding workbench, the angle of the rotating tire is adjusted to carry out backing welding in a flat welding mode, and interlayer cleaning is carried out after the backing welding is finished. When backing welding is carried out, flat welding with simple operation is adopted for welding by adjusting the tire rotating angle.
Furthermore, the welding method is suitable for the condition of welding in a cavity with an included angle between the end surfaces of two welding parts larger than 90 degrees and/or limited space.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1) according to the welding method provided by the invention, when welding with an included angle larger than 90 degrees between the end surfaces of two welding parts is carried out in a cavity with limited space, the welding gun needs to be held reversely, so that the blocking area of the welding gun on the visual field is reduced, and the visual field is prevented from being blocked during welding due to the blocking of the welding gun in the cavity, and the welding quality is further influenced.
2) According to the welding method provided by the invention, when the included angle between the end surfaces of two welding parts is larger than 90 degrees in a cavity with limited space, the welding gun nozzle needs to move along the upper saw tooth shape for welding. Because the included angle between the end surfaces of the two welding parts is a large obtuse angle, the welding liquid medicine and/or molten iron can easily flow downwards to influence the fusion quality of the root of the welding line, and the upper zigzag welding gun nozzle moving mode provided by the invention can prevent the liquid medicine and/or the molten iron from flowing downwards.
3) The welding method provided by the invention adopts the upper sawtooth-shaped movement to carry out welding, so that the swing amplitude of the welding gun is smaller, and the welding operation is convenient to carry out in a cavity with limited space.
4) The invention provides a specific step suitable for welding two welding parts with an included angle larger than 90 degrees in a cavity with limited space, which comprises the steps of cleaning the position near a welding seam before welding, backing welding the welding parts by using a flat welding method, reversely holding a welding gun and moving the welding gun in an upper sawtooth shape to perform filling welding and/or cover surface welding. The welding steps of the invention are reasonably arranged, and the welding quality of the welding with the included angle of the two welding parts being obtuse angles in the cavity with limited space is ensured.
5) The welding method provided by the invention comprises the steps of monitoring the temperature of the welding layer, the temperature of the welding bead, the width of the welding seam, the height difference of a single welding seam and the like in the welding process, and cleaning the welding layers. The welding method provided by the invention can ensure the welding quality of welding the end surfaces of the two welding parts in the cavity, wherein the included angle between the end surfaces of the two welding parts is more than 90 degrees.
The following detailed description of embodiments of the invention refers to the accompanying drawings
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic illustration of the welding process steps in an embodiment of the present invention;
FIG. 2 is a schematic view of a welding gun according to an embodiment of the present invention;
FIG. 3 is a schematic view of a reverse-grip torch weld according to an embodiment of the present invention;
FIG. 4 is a schematic view of the movement of the welding tip during welding in an embodiment of the present invention;
FIG. 5 is a table of parameters for a welding process according to an embodiment of the present invention.
Reference numerals in the drawings indicate: 1. a welding gun; 2. and (7) welding seams.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following describes the defect management modes in the embodiments in detail with reference to the drawings in the embodiments of the present invention.
The invention provides a welding method which is suitable for welding two welding parts with the included angle of more than 90 degrees between the end surfaces of the two welding parts in a cavity with limited space. When welding is carried out in the cavity with limited space, a welding gun is required to be held by hand, and the limited space and the volume of the welding gun are easy to cause limited visual field during welding and influence on welding quality. When the included angle between the end surfaces of the two welding parts is an obtuse angle, the welding liquid medicine and the molten iron are easy to flow downwards under the action of gravity, and the welding quality is also influenced. As described above, when welding is performed in a cavity with a limited space, where an included angle between end surfaces of two welding parts is greater than 90 °, welding quality is difficult to ensure, and difficulty is brought to welding operation. In view of the above situation, the welding method provided by the invention is suitable for welding the end surfaces of two welding parts in a cavity with limited space, wherein the included angle between the end surfaces is larger than 90 degrees, and the welding quality under the condition can be ensured.
The welding method provided by the invention comprises the following steps:
step S1, cleaning a weld joint area before welding;
step S2, backing welding is carried out on the welding parts by using a flat welding method;
and step S3, reversely holding the welding gun and moving the welding gun in an upper sawtooth shape to perform filling welding and/or cover surface welding.
The method and the device firstly need to clean the welding seam area before welding so as to ensure the tidiness of the welding seam area and prevent the welding quality from being influenced by other impurities in the welding seam area. Therefore, in the present invention, in step S1, before welding, oil, moisture and rust within 20mm of the weld zone are removed.
After the welding seam area is cleaned, the step S2 is executed to perform backing welding on the welding piece in a flat welding mode. Specifically, it is first necessary to fix the weldment to the welding platform, and two members to be welded may be fixed in a desired position using a tool. The fixture is used for fixing, so that the included angle between the end faces of the two welding parts during welding can be ensured, and the positions of the welded parts are ensured. After the welding part is fixed by the tool, in order to further ensure the welding position, the preliminary tack welding can be carried out at the welding seam position in a multi-spot welding mode. Backing welding is carried out after positioning welding, wherein the backing welding refers to the welding of a backing welding bead which is firstly carried out at the root part of a back groove of a joint for preventing angular deformation or burning-through phenomenon in automatic welding when a single-side groove of a thick plate is subjected to butt welding. In the single-side welding using the ceramic liner, the first pass welding performed on the ceramic liner is also referred to as backing welding. The invention carries out backing welding before filling welding and cover surface welding, firstly can carry out primary positioning on the welding seam position of a welding part, and secondly can play a role in protecting the welding seam position.
When backing welding is carried out, the welding part is fixed on the welding workbench, the rotating tire angle is adjusted to carry out backing welding in a flat welding mode, and interlayer cleaning is carried out after the backing welding is finished. The flat welding refers to a welding process that a welding position is in a horizontal position or a welding seam with a small inclination angle, a welding rod is positioned on a workpiece, and a welder overlooks the workpiece. This welding position belongs to the one of the full welding positions that is most easily welded. Because the flat welding operation is simpler and the welding quality is easier to ensure, the invention carries out backing welding on the welding piece by adjusting the rotary tire in a flat welding mode. The invention has simple operation of backing welding through flat welding, ensures the welding quality, and carries out interlayer cleaning after the welding is finished to avoid the influence on the filling welding and/or the cover surface welding.
The present invention continues to perform the fill welding and/or the cover welding of step S3 after completing the above-described under welding. In the filling welding and/or the cover surface welding in the step S3, the limited space and the welding gun needing to be held by hand influence the view during welding, so the invention proposes to hold the welding gun backwards during welding. Specifically, the welding gun is turned 180 degrees relative to the original horizontal standing position, and then the welding gun is held by hand; during welding, the included angle between the nozzle of the welding gun and the horizontal plane is kept between 45 and 60 degrees. As shown in fig. 2, which is a schematic view of welding performed while a conventional welding gun is normally held, it is obvious that the welding gun may block the view of welding. As shown in fig. 3, which is a schematic diagram of welding by using the reverse holding welding gun of the present invention, it can be clearly seen that, compared with the conventional welding method, in the welding method of turning the welding gun 180 ° first and then holding the welding gun by hand, the obstruction of the welding gun on the visual field is reduced, and the influence of the blind welding condition on the welding quality can be effectively prevented. When the operator holds the welding gun for welding, the operator preferably stands on one side of the welding gun, which makes the field of view wider.
In the present invention, the welding gun is moved in the "up-saw" shape while performing the fill welding and/or the cap welding of step S3. Specifically, the welding gun tip moves along a zigzag shape from a starting point in a rising and then bending and descending manner, and as shown in fig. 4, the welding gun tip moves along a moving path of the welding gun tip, and periodically moves to form a zigzag path in a rising and then bending and descending manner from the starting point. And considering that a worker can more easily operate in actual welding, the welding gun nozzle moves along a saw-tooth shape in filling welding and/or cover surface welding, and the saw-tooth shape is an isosceles triangle with a vertex angle of 45 degrees +/-15 degrees. During welding, the welding seam moves along the isosceles triangle, so that each welding seam is symmetrical in structure, the welding seam is more attractive, and the mechanical property of the welding seam is more stable. Moreover, an operator can easily weld an angle with a vertex angle of 45 degrees, and the isosceles triangle only needs to keep the highest point and the lowest point consistent when the welding gun moves each time in the welding process, so that the movement route transaction of the welding gun nozzle set by the invention is realized. From the foregoing, when welding is performed in a cavity with a limited space, in which the included angle between the end surfaces of two welded parts is greater than 90 °, the welding water and molten iron are likely to flow downward to affect the welding quality. When the welding gun nozzle moves along the upper sawtooth shape, the welding gun nozzle can effectively prevent the welding water and molten iron from flowing downwards to influence the welding quality because the welding gun nozzle continuously rises in the moving process. The welding gun nozzle adopts the zigzag movement to weld in the process of filling welding and/or cover surface welding, so that the traditional Chinese medicine water and molten iron in the welding process can be prevented from flowing downwards to ensure the welding quality.
From the foregoing, when welding is performed in a cavity with a limited space, where an included angle between end surfaces of two welding parts is greater than 90 °, welding operation may be difficult due to the limitation of objective conditions, and welding quality may be affected. In order to ensure the welding quality, the invention provides that the welding quality is monitored at any time in the welding process, and the condition that the welding quality is not qualified needs to be corrected in time once the welding quality is found. Specifically, when the welding of steps S3 and S4 is performed, the width of each weld is controlled to be within 16mm, and the welding interlayer temperature is controlled to be within 200 °. The welding seam is too wide, welding rods are wasted, the welding speed is influenced, the quality of the welding seam is influenced by the overlarge heat affected zone, and overlarge welding deformation is easy to generate, so that the width of each welding seam is controlled within 16 mm. In the welding process, the temperature is required to be controlled to melt the tin powder and simultaneously avoid damaging circuits, devices and the like due to overhigh temperature, so the invention provides that the temperature between welding layers is controlled within 200 ℃. Specifically, in performing the welding of steps S3 and S4, the temperature of each weld bead is measured after the welding of the weld bead; preferably, the temperature of the weld bead is measured with an infrared thermometer after each weld bead has been welded. And (4) visually detecting whether defects exist after each welding layer is welded, and cleaning oxide skins on the surfaces of the welding layers after the defects do not exist. The operation prevents the welding layer from having defects to influence the overall welding quality and prevents the surface of the welding layer from having oxide scales to influence the fusion between the welding layers. And in order to ensure the fusion of the layer road, when the welding of the steps S3 and S4 is carried out, the height difference of each single welding seam is controlled within 2 mm; preferably, the higher position in the single weld is cut by the reamer when the height difference of the single weld exceeds 2 mm. Namely, the fusion of the layer channels is ensured by controlling the height difference of the single welding seam. The invention provides the detection standard, can detect the welding quality in real time in the welding process, and corrects the welding quality problem when finding the welding quality problem at any time in the welding process so as to ensure the welding quality of the final integral welding part.
As shown in fig. 5, the process parameters when performing welding in the present invention, specifically, when performing welding in steps S3 and S4, carbon dioxide arc welding is used when the number of weld passes is 1-2, the welding material is JM-55II, the rated current in the welding gun is 250A, the rated voltage is 26V, the welding speed is 7.5mm/S, the heat input is 0.69KJ/mm, the weldment is connected to the positive electrode of the power supply, and the welding rod is connected to the negative electrode of the power supply. When the number of welding passes is more than 3 in the welding of the steps S3 and S4, carbon dioxide gas shielded welding is adopted, the welding material is JM-55II, the rated current of a welding gun is 250A, the rated voltage is 26V, the welding speed is 6mm/S, the heat input is 0.87KJ/mm, the welding piece is connected with the positive electrode of the power supply, and the welding rod is connected with the negative electrode of the power supply.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A welding method is characterized in that when two weldments are welded, the weldments are subjected to backing welding by using a flat welding method, and then a welding gun is reversely held and moved in an upper sawtooth shape to perform filling welding and/or cover surface welding.
2. A welding method as defined in claim 1, wherein the operation of welding by reverse holding the welding gun comprises: firstly, turning a welding gun by 180 degrees relative to an original horizontal standing position, and then holding the welding gun by hand; during welding, the included angle between the nozzle of the welding gun and the horizontal plane is kept between 45 and 60 degrees.
3. A welding method according to claim 1, characterized in that the welding torch tip is moved in a zigzag manner from a starting point, rising and then bending down, during the filling welding and/or the cover welding.
4. A welding method according to claim 3, characterized in that the welding torch tip is moved in a zigzag shape during the filling and/or cosmetic welding, said zigzag shape being an isosceles triangle with an apex angle of 45 ° ± 15 °.
5. A welding method according to claim 1, characterized in that it comprises the following steps:
step S1, cleaning a weld joint area before welding;
step S2, backing welding is carried out on the welding parts by using a flat welding method;
and step S3, reversely holding the welding gun and moving the welding gun in an upper sawtooth shape to perform filling welding and/or cover surface welding.
6. A welding method according to claim 5, characterized in that the width of each welding bead along the shape of the upper saw tooth is controlled within 16mm, and the height difference of each single welding bead is controlled within 2 mm;
the temperature between welding layers is controlled within 200 ℃;
preferably, the higher position in the single weld is cut by the reamer when the height difference of the single weld exceeds 2 mm.
7. A welding method as defined in claim 5, characterized in that when welding is performed along the "upper zigzag", carbon dioxide gas shielded welding is used when the number of weld passes is 1-2, the welding material is JM-55II, the rated current in the welding gun is 250A, the rated voltage is 26V, the welding speed is 7.5mm/s, the heat input is 0.69KJ/mm, the welding member is connected with the positive electrode of the power supply, and the welding rod is connected with the negative electrode of the power supply.
8. A welding method as defined in claim 5, wherein in the case of welding along the "zigzag" shape, carbon dioxide gas shielded welding is used when the number of passes is 3 or more, the welding material is JM-55II, the rated current in the welding gun is 250A, the rated voltage is 26V, the welding speed is 6mm/s, the heat input is 0.87KJ/mm, the welding member is connected to the positive electrode of the power supply, and the welding rod is connected to the negative electrode of the power supply.
9. A welding method as defined in claim 5, characterized in that, when backing welding is performed, the welding member is fixed on a welding table, the angle of the rotary jig is adjusted to perform backing welding by flat welding, and after the backing welding is completed, interlayer cleaning is performed.
10. A welding method as claimed in any one of claims 1 to 9, wherein the welding method is adapted for welding in cavities having an included angle between the end faces of the two welded parts of greater than 90 ° and/or having limited space.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114131225A (en) * | 2021-12-30 | 2022-03-04 | 天津大学 | Method for improving impact toughness of heat affected zone of titanium alloy welding joint |
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