CN110548985A - Friction stir welding method for parts with different thicknesses - Google Patents
Friction stir welding method for parts with different thicknesses Download PDFInfo
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- CN110548985A CN110548985A CN201910791428.5A CN201910791428A CN110548985A CN 110548985 A CN110548985 A CN 110548985A CN 201910791428 A CN201910791428 A CN 201910791428A CN 110548985 A CN110548985 A CN 110548985A
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/129—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding specially adapted for particular articles or workpieces
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
Abstract
The invention provides a friction stir welding method of plates with different thicknesses, which comprises the steps that firstly, a positioning welding stirring head inclines towards one side of a thinner part, the positioning welding stirring head is aligned to a butt joint surface and starts to rotate and prick into the butt joint surface, after a shaft shoulder of the positioning welding stirring head is contacted with the thinner part, the positioning welding stirring head continues to rotate for 2-20 seconds, and the positioning welding stirring head rotates along the butt joint surface to finish positioning welding; and then, replacing the positioning welding stirring head with a formal welding stirring head, inclining the formal welding stirring head to one side of the thinner part, aligning the formal welding stirring head to the butt joint surface, starting to rotate and prick into the butt joint surface, after the shaft shoulder of the formal welding stirring head is contacted with the thinner part, continuing to rotate the positioning welding stirring head for 2-20 seconds, and enabling the formal welding stirring head to rotate along the butt joint surface to finish welding. The problems that when parts with different thicknesses are welded, welding flashes are too large, right-angle steps are formed, the back is not welded completely and the like are prone to occurring are effectively solved, and the economic benefit of the friction stir welding technology is improved.
Description
Technical Field
the invention relates to the field of alloy welding, in particular to a friction stir welding method for parts with different thicknesses.
Background
Friction stir welding is a process in which the material to be welded is locally plasticized by heat generated by friction between a high-speed rotating stirring head and the material to be welded, and when the stirring head moves along a butt joint surface, the plasticized material forms a dense solid-phase weld under the extrusion of the stirring head. The welding process can be divided into three stages of vertically pricking a stirring head into a material to be welded, horizontally moving for welding and extracting. From the invention to the present, friction stir welding has been successful in welding materials such as aluminum alloys, magnesium alloys, copper alloys, iron-based alloys, titanium alloys, and the like. However, the conventional friction stir welding butt joint process requires that the thicknesses of two parts to be welded are similar, for example, the thickness difference is less than or equal to 0.5mm, if the thickness difference is too large, the part on the thicker side needs to be processed in advance to be similar to the thickness of the thinner part, and then friction stir welding is performed, so that the workload is increased. If the parts with different thicknesses are directly subjected to friction stir welding, the stirring head vertically penetrates into a material to be welded, and a large welding flash inevitably appears on one side of the thick part; due to the upsetting effect of the stirring head, right-angled steps appear between the welding line and the thick part, the right-angled steps are stress concentration areas, the bearing capacity of the welding line is affected, burrs and the right-angled steps need to be machined again, the workload is large, on the other hand, the defects that observation and pressure control are inconvenient in the welding process, the back is not welded completely and the like easily occur, and the bearing capacity of a welding line joint is affected. Therefore, the existing friction stir welding technology is not suitable for processing the plates with different thicknesses, and the economic benefit of the friction stir welding technology is reduced.
disclosure of Invention
aiming at the defects in the prior art, the invention aims to provide a friction stir welding method for parts with different thicknesses.
The friction stir welding method of the parts with different thicknesses, provided by the invention, comprises the following steps:
Splicing before welding: splicing a first welded part and a second welded part oppositely, wherein a butt joint surface is formed between the first welded part and the second welded part, and the part thickness of the first welded part is smaller than or equal to that of the second welded part;
Positioning welding: aligning the positioning welding stirring head to the butt joint surface, inclining the positioning welding stirring head to the first welded part at a first angle, performing positioning welding, and forming a residual butt joint surface after the positioning welding;
formal welding: and aligning the formal welding stirring head to the butt joint surface, and inclining the formal welding stirring head to the first welded part at a second angle to carry out formal welding.
preferably, the tack welding step comprises:
a first positioning step: the positioning welding stirring head is respectively contacted with a first welded part and a second welded part, the positioning welding stirring head is inclined at a first angle, and the included angle between the positioning welding stirring head and the first welded part is smaller than the included angle between the positioning welding stirring head and the second welded part;
a first advancing step: aligning the positioning welding stirring head to the butt joint face, rotating around the shaft of the positioning welding stirring head at a first preset speed, and performing translational motion to the butt joint face at a second preset speed;
A first rubbing step: after the shaft shoulder of the positioning welding stirring head is contacted with the first welded part, the positioning welding stirring head performs rotary friction between the first welded part and the second welded part within a first preset time, so that one part of the second welded part is transferred to the upper part of the first welded part;
a first welding step: and rotating the positioning welding stirring head around the shaft of the positioning welding stirring head at a third preset speed, and performing translational motion to a first welding termination position at a fourth preset speed, wherein the first welding termination position is positioned at one end of the positioning welding stirring head, facing the residual butt joint surface, after positioning welding.
Preferably, the formal welding step includes:
A second positioning step: the formal welding stirring head is respectively contacted with the first welded part and the second welded part, the formal welding stirring head is inclined at a second angle, and the included angle between the formal welding stirring head and the first welded part is smaller than the included angle between the formal welding stirring head and the second welded part;
A second advancing step: aligning the formal welding stirring head to the butt joint face, rotating around the shaft of the formal welding stirring head at a fifth preset speed, and performing translational motion to the butt joint face at a sixth preset speed;
A second friction step: after the shaft shoulder of the formal welding stirring head is contacted with the butt joint surface, the butt joint surface is subjected to rotary friction between the first part to be welded and the second part to be welded within a second preset time;
A second welding step: and rotating the formal welding stirring head along the butt joint surface at a seventh preset speed, and performing translational motion at an eighth preset speed to a second welding termination position, wherein the second welding termination position is located at one end of the residual butt joint surface back to the formal welding stirring head after positioning welding.
Preferably, the first preset speed is 200rpm to 2000 rpm; the second preset speed is 0.1 mm/min-2 mm/min; the first preset time is 2-20 seconds; the third preset speed is 200 rpm-2000 rpm; the fourth preset speed is 20 mm/min-2000 mm/min.
preferably, the fifth preset speed is 200rpm to 2000 rpm; the sixth preset speed is 0.1 mm/min-2 mm/min; the second preset time is 2-20 seconds; the seventh preset speed is 200rpm to 2000 rpm; the eighth preset speed is 20mm/min to 2000 mm/min.
preferably, the difference between the part thickness of the first welded part and the part thickness of the second welded part is less than or equal to one-half of the part thickness of the first welded part.
preferably, the first angle is 0-10 °; the second angle is 0-8 °.
Preferably, the first angle is greater than or equal to the second angle.
Preferably, the second welded part is located on the advancing side of the tack welding stirring head or the formal welding stirring head, and the advancing side is the same side of the rotation direction and the translation direction of the welding stirring head.
preferably, the length of the stirring pin of the positioned welding stirring head is less than or equal to that of the stirring pin of the formal welding stirring head;
the part thickness of the first welded part is smaller than or equal to the length of a stirring pin of a formal welding stirring head.
compared with the prior art, the invention has the following beneficial effects:
1. The process method is simple, convenient, low in cost and easy to implement;
2. When parts with different thicknesses are welded, the stirring head is inclined towards the side of a thinner part, so that welding flash is reduced, right-angle steps are eliminated, the subsequent processing workload is reduced, and the economic benefit of the friction stir welding technology is improved;
3. The invention thickens the joint, transfers the weak area of the welding seam from the root of the butt joint surface to the welding seam heat affected zone at one side of the thin part, improves the tolerance of the welding seam to the incomplete penetration defect of the root and improves the reliability of the welding seam.
Drawings
other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic representation of a pre-weld condition in the practice of the method of the present invention;
FIG. 2 is a schematic view of a tack-welding state in the practice of the method of the present invention;
FIG. 3 is a schematic view of the method of the present invention after tack welding is completed;
FIG. 4 is a schematic view of a formal welding state in the practice of the method of the present invention;
FIG. 5 is a schematic diagram of a state after completion of formal welding in the practice of the method of the present invention.
The figures show that:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
aiming at the defects in the prior art, the invention aims to solve the problem of welding unequal-thickness parts by conventional friction stir welding, generally requires that the welded unequal-thickness parts are processed to be close in thickness in advance and then friction stir welding is carried out, and has large workload. The large flash and right-angle steps appear during direct welding, the subsequent processing workload is increased, and the economic benefit of the friction stir welding technology is reduced; a large amount of flash brings inconvenience to the observation and pressure control of the welding process, and the defects of incomplete back penetration and the like are easy to occur, so that the bearing capacity of a welding joint is influenced. The invention effectively solves the problems that when parts with different thicknesses are welded, welding flash is too large, right-angle steps appear, and the defects that the back is not welded completely and the like easily appear. Firstly, a positioning welding stirring head inclines towards one side of a thinner part, the positioning welding stirring head is aligned to a butt joint surface and starts to rotate and prick into the butt joint surface, after a shaft shoulder of the positioning welding stirring head is contacted with the thinner part, the positioning welding stirring head continues to rotate for 2-20 seconds, and the positioning welding stirring head rotates along the butt joint surface to finish positioning welding; and then, replacing the positioning welding stirring head with a formal welding stirring head, inclining the formal welding stirring head to one side of the thinner part, aligning the formal welding stirring head to the butt joint surface, starting to rotate and prick into the butt joint surface, after the shaft shoulder of the formal welding stirring head is contacted with the thinner part, continuing to rotate the positioning welding stirring head for 2-20 seconds, and enabling the formal welding stirring head to rotate along the butt joint surface to finish welding.
The friction stir welding method of the parts with different thicknesses, provided by the invention, comprises the following steps:
Splicing before welding: splicing a first welded part 3 and a second welded part 4 oppositely, forming a butt joint surface 31 between the first welded part 3 and the second welded part 4, wherein the part thickness of the first welded part 3 is less than or equal to that of the second welded part 4;
Positioning welding: aligning the positioning welding stirring head 1 to the butt joint surface 31, inclining the positioning welding stirring head 1 to the first welded part 3 at a first angle, performing positioning welding, and forming a residual butt joint surface 32 after the positioning welding;
formal welding: the final welding torch 2 is aligned with the abutting surface 31, and the final welding torch 2 is tilted at a second angle to the first welded component 3 to perform final welding.
specifically, the tack welding step includes:
a first positioning step: the positioning welding stirring head 1 is respectively contacted with a first welded part 3 and a second welded part 4, the positioning welding stirring head 1 is inclined at a first angle, and the included angle between the positioning welding stirring head 1 and the first welded part 3 is smaller than the included angle between the positioning welding stirring head 1 and the second welded part 4;
a first advancing step: aligning the positioning welding stirring head 1 to the butt joint surface 31, rotating around the shaft of the positioning welding stirring head 1 at a first preset speed, and performing translational motion to the butt joint surface 31 at a second preset speed;
a first rubbing step: after the shaft shoulder 11 of the positioning welding stirring head is contacted with the first welded part 3, the positioning welding stirring head 1 is subjected to rotary friction between the first welded part 3 and the second welded part 4 within a first preset time, so that a part of the second welded part 4 is transferred to the upper part of the first welded part 3;
a first welding step: and rotating the positioning welding stirring head 1 around the shaft of the positioning welding stirring head 1 at a third preset speed, and performing translational motion to a first welding termination position at a fourth preset speed, wherein the first welding termination position is positioned at one end, facing the positioning welding stirring head 1, of the residual butt joint surface 32 after positioning welding.
Specifically, the formal welding step includes:
a second positioning step: the formal welding stirring head 2 is respectively contacted with the first welded part 3 and the second welded part 4, the formal welding stirring head 2 is inclined at a second angle, and the included angle between the formal welding stirring head 2 and the first welded part 3 is smaller than the included angle between the formal welding stirring head 2 and the second welded part 4;
a second advancing step: aligning the formal welding stirring head 2 to the butting surface 31, rotating around the axis of the formal welding stirring head 2 at a fifth preset speed, and performing translational motion to the butting surface 31 at a sixth preset speed;
a second friction step: after the shaft shoulder 21 of the formal welding stirring head is contacted with the butting surface 31, the butting surface 31 is subjected to rotary friction between the first part to be welded 3 and the second part to be welded 4 within a second preset time;
a second welding step: and rotating the formal welding stirring head 2 along the butt joint surface 31 at a seventh preset speed, and performing translational motion at an eighth preset speed to a second welding termination position, wherein the second welding termination position is located at one end of the residual butt joint surface 32 back to the formal welding stirring head 2 after positioning welding.
Specifically, the first preset speed is 200 rpm-2000 rpm; the second preset speed is 0.1 mm/min-2 mm/min; the first preset time is 2-20 seconds; the third preset speed is 200 rpm-2000 rpm; the fourth preset speed is 20 mm/min-2000 mm/min.
Specifically, the fifth preset speed is 200rpm to 2000 rpm; the sixth preset speed is 0.1 mm/min-2 mm/min; the second preset time is 2-20 seconds; the seventh preset speed is 200rpm to 2000 rpm; the eighth preset speed is 20mm/min to 2000 mm/min.
Specifically, the difference between the part thickness of the first part to be welded 3 and the part thickness of the second part to be welded 4 is less than or equal to one half of the part thickness of the first part to be welded 3.
specifically, the first angle is 0-10 degrees; the second angle is 0-8 °.
specifically, the first angle is greater than or equal to the second angle.
Specifically, the second welded component 4 is located on the forward side of the tack welding torch 1 or the formal welding torch 2, where the forward side is the same side of the welding torch in the rotation direction and the translation direction.
specifically, the length of the tack welding pin 12 is less than or equal to the length of the formal welding pin 22;
The part thickness of the first part to be welded 3 is less than or equal to the length of the formal welding stirring head stirring pin 22.
Specifically, the first part to be welded 3 and the second part to be welded 4 are made of the same material, for example, 2219 aluminum alloy; or the first part to be welded 3 and the second part to be welded 4 are made of the same metal materials with different grades, such as 2219 aluminum alloy and 2A14 aluminum alloy; alternatively, the first part to be welded 3 and the second part to be welded 4 are made of dissimilar metal materials, such as 2219 aluminum alloy and AZ31B magnesium alloy; or the first welded part 3 and the second welded part 4 are plates or pipes.
preferred embodiments of the present invention will be further described with reference to the accompanying drawings.
as shown in fig. 1 to 5, the method of the present invention can be implemented as follows:
Step one, selecting a proper side inclination angle beta 1 according to the thicknesses of a first part to be welded (a thinner part) 3 and a first part to be welded (a thicker part) 4, and inclining a positioning welding stirring head 1 to one side of the first part to be welded 3;
Aligning the positioning welding stirring head 1 to the butt joint surface 31, rotating at the rotating speed of 200-2000 rpm, and moving to the butt joint surface 31 at the speed of 0.1-20 mm/min;
thirdly, after a shaft shoulder 11 of the positioning welding stirring head 1 of the positioning welding stirring head is contacted with the first welded part 3, the positioning welding stirring head 1 rotates and rubs in the first welded part 3 and the second welded part 4, and the positioning welding stirring head 1 rotates part of the second welded part 4 to the upper part of the first welded part 3 and keeps for 2-20 seconds;
fourthly, the tack welding stirring head 1 rotates along the butt joint surface 31 at the rotating speed of 200 rpm-2000 rpm and moves to the welding termination position at the speed of 20 mm/min-2000 mm/min, and the first tack welding is completed;
And step five, replacing the positioning welding stirring head 1 with a formal welding stirring head 2.
step six, selecting a proper side inclination angle beta 2 according to the thicknesses of the first welded part 3 (thinner part) and the second welded part 4 (thicker part), and formally welding the stirring head 2 to incline towards one side of the first welded part 3;
Step seven, aligning the formal welding stirring head 2 to the butt joint surface 31, starting to rotate at the rotating speed of 200-2000 rpm and moving to the butt joint surface 31 at the speed of 0.1-20 mm/min;
step eight, after the formal welding stirring head shaft shoulder 21 of the formal welding stirring head 2 is completely contacted with the butting surface 31, the formal welding stirring head 2 is subjected to rotary friction in the first welded part 3 and the second welded part 4 and is kept for 2-20 seconds; and step nine, rotating the formal welding stirring head 2 along the butt joint surface 31 at the rotating speed of 200-2000 rpm and moving the formal welding stirring head to the welding termination position at the speed of 20-2000 mm/min to complete welding. The tack weld 5 is shown in figure 3 and the final weld 6 is shown in figure 5.
in a preferred example, in the first step, 6.5mm thick 2219-T6 aluminum alloy and 4.6mm thick 2219-T6 aluminum alloy are used for friction stir welding, a stirring head with a shaft shoulder diameter phi of 14mm and a needle length of 2mm is used for tack welding, wherein the stirring head inclines towards 4.6mm plate material by 5 degrees, in the second step, the stirring head is inserted into the butt joint surface at the rotating speed of 600rpm and the speed of 1.0mm/min, in the third step, after the stirring head is contacted with the 4.6mm plate material, the stirring head is kept for 5 seconds, and in the fourth step, the stirring head is used for tack welding at the rotating speed of 600rpm and the speed of 200 mm/min. And fifthly, formal welding is carried out by using a stirring head with the shaft shoulder diameter phi of 16mm and the needle length of 5.1mm, the stirring head inclines to a 4.6mm plate by 3 degrees in the sixth step, the stirring head is inserted into the welded part at the rotating speed of 600rpm and the speed of 1mm/min in the seventh step, the stirring head is kept for 5 seconds after contacting the 4.6mm plate in the eighth step, and formal welding is carried out by using the stirring head at the rotating speed of 600rpm and the speed of 200mm/min in the ninth step.
in another preferred example, in the first step, friction stir welding is carried out by using 6.5mm thick 2A14-T6 aluminum alloy and 5.4mm thick 2A14-T6 aluminum alloy, and tack welding is carried out by using a stirring head with a shaft shoulder diameter of phi 14mm and a needle length of 2mm, wherein the stirring head inclines towards a 5.4mm plate for 3 degrees, the stirring head is inserted into the butt joint surface at a rotating speed of 600rpm and a speed of 1.0mm/min in the second step, the stirring head is kept for 5 seconds after being contacted with the 5.4mm plate in the third step, and the stirring head is subjected to tack welding at a rotating speed of 600rpm and a speed of 200mm/min in the fourth step. And fifthly, using a stirring head with the shaft shoulder diameter phi of 16mm and the needle length of 5.9mm to carry out formal welding, inclining the stirring head to a 5.4mm plate by 1 degree in the sixth step, pricking the part to be welded into the stirring head at the rotating speed of 600rpm and the speed of 1mm/min in the seventh step, keeping for 5 seconds after the stirring head is contacted with the 5.4mm plate in the eighth step, and carrying out formal welding at the rotating speed of 600rpm and the speed of 200mm/min by the stirring head in the ninth step.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
the foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. a friction stir welding method of parts with different thicknesses is characterized by comprising the following steps:
Splicing before welding: the method comprises the following steps of relatively splicing a first welded part (3) and a second welded part (4), forming a butt joint surface (31) between the first welded part (3) and the second welded part (4), wherein the part thickness of the first welded part (3) is smaller than or equal to that of the second welded part (4);
positioning welding: aligning the positioning welding stirring head (1) to the butt joint surface (31), inclining the positioning welding stirring head (1) to the first welded part (3) at a first angle, performing positioning welding, and forming a residual butt joint surface (32) after the positioning welding;
Formal welding: the formal welding stirring head (2) is aligned with the butt joint surface (31), and the formal welding stirring head (2) inclines to the first welded part (3) at a second angle for formal welding.
2. The friction stir welding method of unequal thickness parts according to claim 1, wherein the tack welding step comprises:
a first positioning step: the positioning welding stirring head (1) is respectively contacted with a first welded part (3) and a second welded part (4), the positioning welding stirring head (1) is inclined at a first angle, and the included angle between the positioning welding stirring head (1) and the first welded part (3) is smaller than the included angle between the positioning welding stirring head (1) and the second welded part (4);
a first advancing step: aligning the positioning welding stirring head (1) to the butt joint surface (31), rotating around the shaft of the positioning welding stirring head (1) at a first preset speed, and performing translational motion to the butt joint surface (31) at a second preset speed;
a first rubbing step: after the shaft shoulder (11) of the positioning welding stirring head is contacted with the first welded part (3), the positioning welding stirring head (1) performs rotary friction between the first welded part (3) and the second welded part (4) within a first preset time, so that one part of the second welded part (4) is transferred to the upper part of the first welded part (3);
A first welding step: and rotating the positioning welding stirring head (1) around the shaft of the positioning welding stirring head (1) at a third preset speed, and performing translational motion to a first welding termination position at a fourth preset speed, wherein the first welding termination position is positioned at one end, facing the positioning welding stirring head (1), of the residual butt joint surface (32) after positioning welding.
3. The friction stir welding method of unequal thickness parts according to claim 1, wherein the formal welding step comprises:
A second positioning step: the formal welding stirring head (2) is respectively contacted with the first welded part (3) and the second welded part (4), the formal welding stirring head (2) is inclined at a second angle, and the included angle between the formal welding stirring head (2) and the first welded part (3) is smaller than the included angle between the formal welding stirring head (2) and the second welded part (4);
A second advancing step: aligning the formal welding stirring head (2) to the butt joint surface (31), rotating around the axis of the formal welding stirring head (2) at a fifth preset speed, and performing translational motion to the butt joint surface (31) at a sixth preset speed;
A second friction step: after the shaft shoulder (21) of the formal welding stirring head is contacted with the butt joint surface (31), the butt joint surface (31) performs rotary friction between the first welded part (3) and the second welded part (4) within a second preset time;
a second welding step: and rotating the formal welding stirring head (2) along the butt joint surface (31) at a seventh preset speed, and performing translational motion at an eighth preset speed to a second welding termination position, wherein the second welding termination position is positioned at one end of the residual butt joint surface (32) back to the formal welding stirring head (2) after positioning welding.
4. The friction stir welding method of unequal thickness parts according to claim 2, wherein the first preset speed is 200rpm to 2000 rpm;
The second preset speed is 0.1 mm/min-2 mm/min;
The first preset time is 2-20 seconds;
the third preset speed is 200 rpm-2000 rpm;
the fourth preset speed is 20 mm/min-2000 mm/min.
5. The friction stir welding method of unequal thickness parts according to claim 3, wherein the fifth preset speed is 200rpm to 2000 rpm;
the sixth preset speed is 0.1 mm/min-2 mm/min;
The second preset time is 2-20 seconds;
the seventh preset speed is 200rpm to 2000 rpm;
The eighth preset speed is 20mm/min to 2000 mm/min.
6. Friction stir welding method of parts of unequal thickness according to claim 1, characterized in that the difference in thickness of the part thickness of the first part to be welded (3) and the part thickness of the second part to be welded (4) is less than or equal to half the part thickness of the first part to be welded (3).
7. the friction stir welding method of unequal thickness parts according to claim 1, wherein the first angle is 0 to 10 °;
the second angle is 0-8 °.
8. the friction stir welding method of unequal thickness parts according to claim 1 wherein the first angle is greater than or equal to a second angle.
9. Method for friction stir welding of parts of unequal thickness according to claim 1, characterized in that the second part to be welded (4) is on the advancing side of the tack welding pin (1) or the formal welding pin (2), which is the side where the direction of rotation and the direction of translation of the welding pin are the same.
10. the friction stir welding method of unequal thickness parts according to claim 1, wherein the length of the tack welding pin (12) is less than or equal to the length of the formal welding pin (22); the part thickness of the first part to be welded (3) is smaller than or equal to the length of a stirring pin (22) of a formal welding stirring head.
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| Publication number | Priority date | Publication date | Assignee | Title |
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