CN113510366B - Welding device and welding method for heat conducting substrate and fins of heat pipe radiator - Google Patents
Welding device and welding method for heat conducting substrate and fins of heat pipe radiator Download PDFInfo
- Publication number
- CN113510366B CN113510366B CN202110761323.2A CN202110761323A CN113510366B CN 113510366 B CN113510366 B CN 113510366B CN 202110761323 A CN202110761323 A CN 202110761323A CN 113510366 B CN113510366 B CN 113510366B
- Authority
- CN
- China
- Prior art keywords
- welding
- heat
- fins
- pipe radiator
- laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003466 welding Methods 0.000 title claims abstract description 244
- 239000000758 substrate Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004146 energy storage Methods 0.000 claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 13
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims abstract description 7
- 230000007246 mechanism Effects 0.000 claims description 51
- 230000033001 locomotion Effects 0.000 claims description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- 238000007493 shaping process Methods 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 8
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000005476 soldering Methods 0.000 abstract description 13
- 229910000679 solder Inorganic materials 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 9
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 230000008595 infiltration Effects 0.000 abstract description 5
- 238000001764 infiltration Methods 0.000 abstract description 5
- 230000006698 induction Effects 0.000 abstract description 4
- 230000005855 radiation Effects 0.000 abstract 1
- 230000017525 heat dissipation Effects 0.000 description 13
- 239000000956 alloy Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000026058 directional locomotion Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
-
- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/26—Storage discharge 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/073—Shaping the laser spot
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a welding device and a welding method for a heat pipe radiator heat conducting substrate and fins, wherein the welding device for the heat pipe radiator heat conducting substrate and fins comprises an adjustable rectangular collimation laser component and a capacitive energy storage seam welder, and the adjustable rectangular collimation laser component comprises an optical fiber laser, an optical gate, a beam shaper and a collimation laser gun which are electrically connected in sequence; the capacitive energy storage seam welder comprises a rectifier, a capacitor, a welding transformer and seam welding rollers which are electrically connected in sequence. The welding device for the heat conduction substrate and the fins of the heat pipe radiator overcomes the defects existing in the prior art of welding the heat conduction substrate and the fins of the heat pipe radiator by reflow soldering and high-frequency induction heating, solves the problems of incomplete infiltration, air holes, copper alloy, aluminum alloy fins, easy occurrence of cracks and large deformation in welding of large-area solder paste, and the like, can obtain the heat pipe radiator with tin-free welding fins with higher heat radiation power, and has the advantages of high forming quality, low cost and the like.
Description
Technical Field
The invention relates to the technical field of welding of heat dissipation equipment, in particular to a welding device and a welding method for a heat conduction substrate and fins of a heat pipe radiator.
Background
The third industrial revolution represented by information technology has been rising and developing, which greatly promotes the wide application and popularization of electronic computers in daily life. With the increasing degree of integration of semiconductor circuits, such as central processing units, graphics processors, communication processors, etc., smaller chip processes are continuously broken through, the heat flux density of the chip is continuously increased, the working temperature is easier to exceed the calibrated temperature range, and the heat dissipation performance of the chip radiator is very important. Therefore, how to improve the heat dissipation performance of the heat sink to ensure the stable operation of the chip is a current urgent problem to be solved.
The heat pipe radiator adopts a gas-liquid phase change type heat exchange scheme, and the heat dissipation power of the heat pipe radiator is tens of times of that of a common entity air-cooled radiator, so that the heat pipe radiator is widely used for heat dissipation of chips with high integration level. The heat pipe radiator is generally composed of a heat conducting substrate, a heat pipe and fins, and can be divided into an integrated structure and a combined structure. The heat conducting substrate and the fins of the integrated heat pipe radiator are integrated and are commonly manufactured by milling, and the heat conducting substrate and the fins of the integrated heat pipe radiator are small in use amount in the market due to the problems of low material utilization rate, high processing difficulty and the like. The heat conducting base plate and the fins of the combined heat pipe radiator are independently processed, the combination mode of the heat conducting base plate and the fins is divided into embedded type and welded type, and the welded type structure is larger in contact area and higher in integrity, so that the heat pipe radiator has better heat radiating efficiency. At present, the heat conducting substrate and the fins of the heat pipe radiator in the market are mostly welded by adopting a reflow soldering scheme, but the defects of insufficient solder paste infiltration, air holes and the like are easy to occur during soldering, and when the soldering area is larger, the defects are more, so that the actual heat dissipation power is difficult to reach the theoretical heat dissipation power.
In view of the foregoing, there is a need in the art to provide a method for soldering a heat-conducting substrate and a fin of a heat-pipe radiator without tin, which avoids the soldering defect in the soldering process of solder paste, and improves the heat dissipation power of the heat-pipe radiator, so as to better satisfy the application of the fin soldering aspect of the combined heat-pipe radiator.
Disclosure of Invention
The invention mainly aims to provide a welding device and a welding method for a heat conduction substrate and fins of a heat pipe radiator, which aim to reduce welding defects in the welding process and improve the heat dissipation power of the heat pipe radiator.
In order to achieve the above object, the present invention provides a welding device for a heat conducting substrate and fins of a heat pipe radiator, comprising an adjustable rectangular collimation laser component and a capacitive energy storage seam welder, wherein,
the adjustable rectangular collimation laser assembly comprises an optical fiber laser, an optical gate, a beam shaper and a collimation laser gun which are electrically connected in sequence, wherein the optical fiber laser is used for generating continuous laser with the intensity being in Gaussian distribution and inputting the optical gate, the optical gate is used for collimating and inputting the input Gaussian laser into the beam shaper, and the beam shaper is used for shaping the Gaussian laser into the laser with the intensity being in rectangular distribution and emitting the laser through the collimation laser gun;
the capacitor energy storage seam welder comprises a rectifier, a capacitor, a welding transformer and seam welding rollers which are electrically connected in sequence, wherein the rectifier is used for rectifying input power frequency alternating current and charging the capacitor, pulse current with low voltage and high energy density is obtained through the welding transformer after the capacitor is charged, and the seam welding rollers are used for discharging.
Preferably, the welding device for the heat conducting substrate and the fins of the heat pipe radiator further comprises a fixed base for installing the heat conducting substrate, wherein the fixed base comprises a working platform for supporting the fixed base, and a transverse moving mechanism and a longitudinal moving mechanism which are connected with the working platform and respectively control the working platform to move transversely and longitudinally.
Preferably, the transverse moving mechanism comprises a first fixed bottom plate, a transverse screw rod, a transverse moving sliding block and a first servo moving mechanism, wherein the transverse screw rod is positioned above the first fixed bottom plate, the transverse moving sliding block is arranged on the transverse screw rod in a penetrating way, the first servo moving mechanism is connected with the transverse screw rod to drive the transverse screw rod to rotate, and the transverse moving sliding block is fixed below the working platform to support the working platform;
the longitudinal moving mechanism comprises a second fixed bottom plate, a longitudinal screw rod, a longitudinal moving sliding block and a second servo moving mechanism, wherein the longitudinal screw rod is positioned above the second fixed bottom plate, the longitudinal moving sliding block penetrates through the longitudinal screw rod, the second servo moving mechanism is connected with the longitudinal screw rod to drive the longitudinal screw rod to rotate, and the longitudinal moving sliding block is fixed below the first fixed bottom plate to support the first fixed bottom plate.
Preferably, the welding device for the heat conducting substrate and the fins of the heat pipe radiator further comprises a controller electrically connected with the first servo motion mechanism and the second servo motion mechanism.
The invention further provides a welding method based on the welding device for the heat conducting substrate and the fins of the heat pipe radiator, which comprises the following steps:
s1, performing spot welding pre-fixing on a welding narrow edge of an L-shaped fin and a heat conducting substrate;
s2, fixing the alignment laser gun in front of the rolling direction of the seam welding roller, adjusting the horizontal distance between the alignment laser gun and the seam welding roller, adjusting the alignment laser gun to keep vertical to the working platform, recording the X-axis coordinate of the alignment laser gun on the working platform, and setting the size of the rectangular light beam after shaping by the beam shaper;
s3, fixing the heat pipe radiator pre-fixed in the S1 on a working platform, moving the heat pipe radiator to coincide with an X-axis coordinate of the collimation laser gun through a first servo mechanism and a second servo motion mechanism, and adjusting the mounting height of the seam welding roller to enable the seam welding roller to be closely attached to the welding narrow side of the L-shaped fin;
s4, starting a welding device to start welding, wherein in the welding process, rectangular laser emitted by a collimated laser gun firstly preheats the welding narrow sides of the L-shaped fins, and after preheating, the seam welding roller performs energy storage seam welding;
s5, repeating the steps S1 to S4 until welding of all the L-shaped fins is completed.
Preferably, when the welding narrow side of the L-shaped fin and the heat conducting substrate are pre-fixed by spot welding:
and placing the narrow edge of the L-shaped fin in a region to be welded, and respectively performing primary capacitance spot welding on the starting position and the ending position of the narrow edge, wherein the capacitance electric welding current is 0.5kA-2kA.
Preferably, the width of the rectangular laser after being shaped by the beam shaper is smaller than or equal to the width of the narrow side of the L-shaped fin, and the material of the seam welding roller is tungsten alloy.
Preferably, the materials of the L-shaped fins and the heat conducting substrate are aluminum, copper, aluminum alloy or copper alloy.
Preferably, when the material of the L-shaped fins is copper or copper alloy, the rectangular collimation laser power range is 300W-500W, the capacitance energy storage seam welding current range is 5kA-7kA, and the welding surface pressure range is 40MPa-60MPa.
Preferably, when the material of the L-shaped fins is aluminum or aluminum alloy, the rectangular collimation laser power range is 200W-400W, the capacitance energy storage seam welding current range is 3kA-5kA, and the welding surface pressure range is 40MPa-60MPa.
The welding device for the heat conducting substrate and the fins of the heat pipe radiator has the following beneficial effects:
1. the electric conductivity of aluminum and copper alloy is reduced by the collimation laser preheating when the fins of the aluminum, copper and alloy materials are welded by the combination of the collimation rectangular laser preheating and the energy-storage seam welding, the conversion rate of electric energy and heat energy in the capacitive energy-storage seam welding process can be remarkably increased, and the contact interface is rapidly melted, so that a high-quality welding seam is obtained; meanwhile, the preheating effect can effectively avoid the outstanding problems of difficult welding, large deformation and the like caused by high heat conductivity and large linear expansion coefficient of aluminum and copper alloy, and the welded product has high forming quality, no defect of welding seams and small deformation;
2, the heat-conducting substrate of the heat pipe radiator and the L-shaped fins are welded in a combined mode of laser and energy storage seam welding, solder paste is not required to be coated in the welding process, and the problems of incomplete wetting, air holes and the like which are easy to occur in solder paste reflow soldering are avoided in large-area welding;
3. when welding, only the area to be welded is locally heated, and the reflow welding and the high-frequency induction heating welding method are all required to integrally heat the heat pipe radiator, so that the invention has the advantages of lower required heat power, higher energy utilization rate and lower cost.
4. The welding device has the advantages of simple structure, reliable operation and easy realization.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of a soldering apparatus for a heat-conducting substrate and fins of a heat pipe radiator according to the present invention;
fig. 2 is a schematic structural diagram of a heat pipe radiator in embodiment 1 of a welding method for a heat conducting substrate and fins of the heat pipe radiator according to the present invention;
fig. 3 is a schematic structural diagram of a heat pipe radiator according to embodiment 2 of the welding method for the heat conducting substrate and the fins of the heat pipe radiator.
In the figure, a 1-seam welding roller, a 2-collimation laser gun, a 3-L-shaped fin, a 4-heat conducting substrate, a 5-working platform, a 6-first servo motion mechanism, a 7-transverse screw rod, an 8-transverse moving slide block, a 9-guide rail, a 10-screw rod coupler, a 11-second servo motion mechanism, a 12-longitudinal moving slide block, a 13-second fixed bottom plate and a 14-longitudinal screw rod.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be noted that, in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides a welding device for a heat conducting substrate and fins of a heat pipe radiator.
Referring to fig. 1, a welding device for a heat pipe radiator heat conducting substrate and fins comprises an adjustable rectangular collimation laser component and a capacitive energy storage seam welder, wherein,
the adjustable rectangular collimation laser assembly comprises an optical fiber laser, an optical gate, a beam shaper and a collimation laser gun 2 which are electrically connected in sequence, wherein the optical fiber laser is used for generating continuous laser with the intensity being in Gaussian distribution and inputting the optical gate, the optical gate is used for collimating and inputting the input Gaussian laser into the beam shaper, and the beam shaper is used for shaping the Gaussian laser into the laser with the intensity being in rectangular distribution and emitting the laser through the collimation laser gun 2;
the capacitor energy-storage seam welder comprises a rectifier, a capacitor, a welding transformer and a seam welding roller 1 which are electrically connected in sequence, wherein the rectifier is used for rectifying input power frequency alternating current and charging the capacitor, and pulse current with low voltage and high energy density is obtained through the welding transformer after the capacitor is charged, and is discharged through the seam welding roller 1.
The welding device for the heat conducting substrate and the fins of the heat pipe radiator further comprises a fixed base for installing the heat conducting substrate 4, wherein the fixed base comprises a working platform 5 for supporting the fixed base, and a transverse moving mechanism and a longitudinal moving mechanism which are connected with the working platform 5, and the transverse moving mechanism and the longitudinal moving mechanism respectively control the working platform 5 to transversely (namely, the X direction in the figure 1) and longitudinally move (longitudinally (namely, the Y direction in the figure 1).
In this embodiment, the lateral movement mechanism includes a first fixed bottom plate, a lateral screw rod 7, a lateral movement slider 8 and a first servo movement mechanism 6, the lateral screw rod 7 is located above the first fixed bottom plate, the lateral movement slider 8 is arranged on the lateral screw rod 7 in a penetrating manner, the first servo movement mechanism 6 is connected with the lateral screw rod 7 to drive the lateral screw rod 7 to rotate, and the lateral movement slider 8 is located below the working platform 5 and fixedly connected with the working platform to support the working platform;
the longitudinal moving mechanism comprises a second fixed bottom plate 13, a longitudinal screw rod 14, a longitudinal moving slide block 12 and a second servo moving mechanism 11, wherein the longitudinal screw rod 14 is positioned above the second fixed bottom plate 13, the longitudinal moving slide block 12 is arranged on the longitudinal screw rod 14 in a penetrating way, the second servo moving mechanism 11 is connected with the longitudinal screw rod 14 to drive the longitudinal screw rod 14 to rotate, and the longitudinal moving slide block 12 is positioned below the first fixed bottom plate and fixedly connected with the first fixed bottom plate. The lateral movement slider 8 and the longitudinal movement slider 12 are respectively mounted on the corresponding guide rail 9 and slidable with respect to the guide rail 9. The sliding direction of the slider is limited by providing the guide rail 9. The first servo movement mechanism 6 and the second servo movement mechanism 11 may be servo motors.
The working platform 5 may fix the heat conductive substrate 4 in various manners, which is not limited in the present invention. In this embodiment, the lateral movement mechanism is provided with two sets to stably support the work platform 5. Similarly, two longitudinal screws 14 are arranged in the longitudinal moving mechanism, and each longitudinal screw 14 is sleeved with two longitudinal sliding blocks to stably support the transverse moving mechanism.
Further, the welding device for the heat conducting substrate and the fins of the heat pipe radiator further comprises a controller electrically connected with the first servo motion mechanism 6 and the second servo motion mechanism 11, and the automatic control of the movement of the working platform in place is realized through the controller.
The following specifically describes a method of using the welding device for the heat-conducting substrate and the fins of the heat pipe radiator (the narrow side of the L-shaped fins 3 is a welding area, and the wide side is a heat dissipation area).
Placing the narrow edge of the L-shaped fin 3 in a region to be welded of the heat conducting substrate 4, and respectively performing primary small-current capacitance spot welding pre-fixing on the starting position and the ending position of the narrow edge by using a precise capacitance spot welder;
installing a collimation laser gun 2 and a seam welding roller 1 on a welding mechanical arm, adjusting the horizontal distance between the collimation laser gun 2 and the seam welding roller 1, adjusting the posture of the mechanical arm to enable laser emitted by the collimation laser gun 2 to be parallel to the normal line of a working platform 5, recording the X-axis coordinate of the mechanical arm on the working platform 5 at present, and setting the size of a rectangular light beam after shaping by a beam shaper;
fixing the pre-fixed heat conducting substrate 4 on a working platform 5, moving the pre-fixed heat conducting substrate to coincide with the X-axis coordinate of a welding mechanical arm through a first servo motion mechanism 6 and a second servo motion mechanism 11, and adjusting the mounting height of the mechanical arm to enable the seam welding roller 1 to be closely attached to the welding narrow side of the L-shaped fin 3;
and starting the welding device to start welding. In the welding process, rectangular laser emitted by the collimation laser gun 2 firstly preheats the welding narrow sides of the L-shaped fins 3, and then the welding roller 1 is tightly welded for energy storage seam welding;
repeating the above steps until the welding of all the L-shaped fins 3 is completed.
The heat pipe radiator is used as one of the necessary heat dissipation tools of the semiconductor integrated circuit, the heat dissipation performance of the heat pipe radiator directly influences the working stability of the semiconductor integrated circuit, but most of the heat pipe radiator fins and the heat conducting substrate 4 on the market at present are welded by adopting a welding scheme of solder paste reflow soldering, and the defects of insufficient solder paste infiltration, air holes and the like can be unavoidable in the reflow soldering, so that the heat dissipation efficiency of the radiator is reduced. In order to solve the above problems, the welding device provided by the invention realizes the welding of the heat pipe radiator fins and the heat conducting substrate 4, and further provides the solder paste-free and defect-free welding of the fins and the heat conducting substrate 4 through specific control of laser intensity distribution, laser power, pressure of the seam welding roller 1 and energy storage seam welding current.
More specifically, when the analysis is performed, the temperature is one of the important factors affecting the conductivity of the metal material, the capacitance of the metal comes from the collision generated by the electron directional movement process and the crystal lattice, the vibration of the crystal lattice is aggravated by the increase of the temperature, the probability of collision with the crystal lattice in the electron directional movement process is increased, and the conductivity of the metal material is reduced. Copper, aluminum and alloys thereof are used as main materials of the heat pipe radiator fins, and have higher conductivity, so that the capacitive seam welding is difficult to weld or requires large input current.
As a key design point of the invention, the rectangular collimated laser preheats the welding surface at the front part of the seam welding roller 1. The present invention is particularly limited to lasers because the gaussian focused lasers currently in wide use are not suitable for preheating the fin bonding surfaces. For Gaussian focusing beams, the light intensity gradient from the center to the edge of the beam is large, namely the heat distribution of the laser is uneven, the uniform preheating of a welding surface is difficult to realize, the focusing laser needs to accurately control the defocusing amount, and the installation and adjustment of a laser gun are more limited. The laser generated by the laser is collimated and shaped, so that the laser intensity is uniformly distributed in a rectangular area with the same width as the welding surface, the welding surface is uniformly preheated, and the height from the laser gun head to the welding seam is not limited by the collimated laser, so that the device is further convenient to install and adjust.
The welding device for the heat conducting substrate and the fins of the heat pipe radiator has the following beneficial effects:
1. the electric conductivity of aluminum and copper alloy is reduced by the collimation laser preheating when the fins of the aluminum, copper and alloy materials are welded by the combination of the collimation rectangular laser preheating and the energy-storage seam welding, the conversion rate of electric energy and heat energy in the capacitive energy-storage seam welding process can be remarkably increased, and the contact interface is rapidly melted, so that a high-quality welding seam is obtained; meanwhile, the preheating effect can effectively avoid the outstanding problems of difficult welding, large deformation and the like caused by high heat conductivity and large linear expansion coefficient of aluminum and copper alloy, and the welded product has high forming quality, no defect of welding seams and small deformation;
2, the heat-conducting substrate 4 of the heat pipe radiator and the L-shaped fins 3 are welded in a combined mode of laser and energy storage seam welding, solder paste is not required to be coated in the welding process, and the problems of incomplete infiltration, air holes and the like which are easy to occur in solder paste reflow soldering are avoided in large-area welding;
3. when welding, only the area to be welded is locally heated, and the reflow welding and the high-frequency induction heating welding method are all required to integrally heat the heat pipe radiator, so that the invention has the advantages of lower required heat power, higher energy utilization rate and lower cost.
4. The welding device has the advantages of simple structure, reliable operation and easy realization.
The invention further provides a welding method for the heat conducting substrate and the fins of the heat pipe radiator.
In the preferred embodiment, a welding method based on the welding device for the heat conducting substrate and the fins of the heat pipe radiator comprises the following steps:
step S1, pre-fixing the welding narrow sides of the L-shaped fins 3 and the heat conducting substrate 4 by spot welding;
step S2, fixing the collimating laser gun 2 in front of the rolling direction of the seam welding roller 1 (mounting the collimating laser gun 2 and the seam welding roller 1 on a welding mechanical arm), adjusting the horizontal distance between the collimating laser gun 2 and the seam welding roller 1, adjusting the collimating laser gun 2 to keep vertical with the working platform 5 (adjusting the posture of the mechanical arm to enable the laser emitted by the collimating laser gun 2 to be parallel to the normal line of the working platform 5), recording the X-axis coordinate of the collimating laser gun 2 on the working platform 5, and setting the size of a rectangular light beam after shaping by a beam shaper;
step S3, fixing the heat pipe radiator pre-fixed in the step S1 on a working platform 5, moving the heat pipe radiator to be overlapped with the X-axis coordinate of the collimation laser gun 2 through a first servo mechanism and a second servo motion mechanism 11, and adjusting the installation height of the seam welding roller 1 to enable the seam welding roller 1 to be closely attached to the welding narrow side of the L-shaped fin 3;
step S4, starting a welding device to start welding, wherein in the welding process, rectangular laser emitted by a collimation laser gun 2 preheats the welding narrow sides of an L-shaped fin 3, and a seam welding roller 1 performs energy-storage seam welding after preheating (the distance between the collimation laser gun 2 and the seam welding roller 1 is fixed, so that welding is performed while preheating, and then welding is performed after all preheating in the whole length direction is completed);
s5, repeating the steps S1 to S4 until the welding of all the L-shaped fins 3 is completed.
In step S4, the welding parameters may be adjusted according to the specific situation, and the welding parameter adjustment includes laser power, seam welding current, seam welding pressure and welding speed, preferably corresponding to the fin material.
Specifically, when the welding narrow side of the L-shaped fin 3 is pre-fixed with the heat conductive substrate 4 by spot welding:
and placing the narrow edge of the L-shaped fin 3 in a region to be welded, and respectively performing primary capacitance spot welding on the starting part and the ending part of the narrow edge, wherein the capacitance electric welding current is 0.5kA-2kA.
The width of the rectangular laser after being shaped by the beam shaper is smaller than or equal to the width of the narrow side of the L-shaped fin 3, and the seam welding roller 1 is made of tungsten alloy.
Specifically, the materials of the L-shaped fins 3 and the heat conducting substrate 4 are aluminum, copper, aluminum alloy or copper alloy.
When the material of the L-shaped fin 3 is copper or copper alloy, the rectangular collimation laser power range is 300W-500W, the capacitance energy storage seam welding current range is 5kA-7kA, and the welding surface pressure range is 40MPa-60MPa.
When the L-shaped fin 3 is made of aluminum or aluminum alloy, the rectangular collimation laser power range is 200W-400W, the capacitance energy storage seam welding current range is 3kA-5kA, and the welding surface pressure range is 40MPa-60MPa.
The following is a detailed description of two examples.
As shown in fig. 2, the heat conducting substrate 4 of the heat pipe radiator has a length of 120mm in the X direction, 80mm in the Y direction and a thickness of 4mm in the Z direction; the length of the long L-shaped fins 3 in the Y direction is 80mm, the length of the long L-shaped fins in the X direction is 3mm, the height of the long L-shaped fins in the Z direction is 15mm, and the thickness of the long L-shaped fins is 0.3mm, and 30 long L-shaped fins are formed in total; the short L-shaped fins 3 were 50mm long in Y direction, 3mm long in X direction, 15mm high in Z direction and 0.3mm thick for 10 pieces in total. The heat conducting substrate 4 and the fins are both T2 red copper.
When the welding method of the invention is adopted, the method comprises the following steps:
the first step: placing the narrow edge of the L-shaped fin 3 in a to-be-welded area of the heat conducting substrate 4, and respectively performing primary capacitance spot welding positioning on the starting position and the ending position of the narrow edge by using a tight capacitance spot welder, wherein the current is 1kA;
and a second step of: the method comprises the steps of installing a collimation laser gun 2 and a seam welding roller 1 on corresponding positions of a welding mechanical arm, adjusting the horizontal distance between the collimation laser gun 2 and the seam welding roller 1 to be 10mm, adjusting the posture of the mechanical arm to enable laser emitted by the collimation laser gun 2 to be parallel to the normal line of a working platform 5, recording the X-axis coordinate of the mechanical arm on the working platform 5 at present, and setting the size of a rectangular light beam after shaping by a beam shaper to be 2.7mm long in the X direction and 4mm long in the Y direction;
and a third step of: fixing a heat pipe radiator which is positioned in advance on a working platform 5, moving the heat pipe radiator to be overlapped with an X-axis coordinate of a welding mechanical arm through a first servo mechanism and a second servo motion mechanism 11, and adjusting the height of the mechanical arm to enable a seam welding roller 1 to be closely attached to a welding narrow side of an L-shaped fin 3;
fourth step: setting the laser power to 400W, the capacitor energy storage seam welding current to 6kA, the welding surface pressure to 50MPa, and the welding speed to 4m/min. The device is started and welding is started. In the welding process, rectangular laser emitted by the collimation laser gun 2 firstly preheats the welding narrow sides of the L-shaped fins 3, and then the welding roller 1 is tightly welded for energy storage seam welding;
fifth step: and repeating the steps to finish the welding of all the L-shaped fins 3.
Example 2
As shown in fig. 3, the heat conducting substrate 4 of the heat pipe radiator has a length of 150mm in the X direction, a length of 100mm in the Y direction, and a thickness of 4mm in the Z direction; the length of the long L-shaped fins 3 in the Y direction is 100mm, the length of the long L-shaped fins in the X direction is 5mm, the height of the long L-shaped fins in the Z direction is 15mm, and the thickness of the long L-shaped fins is 0.3mm, and 24 long L-shaped fins are formed in total; the short L-shaped fins 3 have a length of 70mm in the Y direction, a length of 5mm in the X direction, a height of 15mm in the Z direction and a thickness of 0.3mm, and 6 pieces in total. The heat conducting base plate 4 and the fins are made of 1060 pure aluminum.
When the welding method of the invention is adopted, the method comprises the following steps:
the first step: placing the narrow edge of the L-shaped fin 3 in a to-be-welded area of the heat conducting substrate 4, and respectively performing primary capacitance spot welding positioning on the starting position and the ending position of the narrow edge by using a tight capacitance spot welder, wherein the current is 0.8kA;
and a second step of: installing a composite device of the collimation laser gun 2 and the seam welding roller 1 on a welding mechanical arm, adjusting the horizontal distance between the collimation laser gun 2 and the seam welding roller 1 to be 12mm, adjusting the posture of the mechanical arm to enable laser emitted by the collimation laser gun 2 to be parallel to the normal line of the working platform 5, recording the X-axis coordinate of the mechanical arm on the working platform 5 at present, and setting the rectangular beam size after shaping by a beam shaper to be 4.7mm long in the X direction and 5mm long in the Y direction;
and a third step of: fixing the positioned heat pipe radiator in the step S1 on a working platform 5, moving the heat pipe radiator to coincide with the X-axis coordinate of a welding mechanical arm through a first servo mechanism and a second servo motion mechanism 11, and adjusting the height of the mechanical arm to enable the seam welding roller 1 to be closely attached to the welding narrow side of the L-shaped fin 3;
fourth step: setting the laser power to 300W, the capacitor energy storage seam welding current to 4kA, the welding surface pressure to 50MPa, and the welding speed to 4m/min. The device is started and welding is started. In the welding process, rectangular laser emitted by the collimation laser gun 2 firstly preheats the welding narrow sides of the L-shaped fins 3, and then the welding roller 1 is tightly welded for energy storage seam welding;
fifth step: and repeating the steps to finish the welding of all the L-shaped fins 3.
The welding method for the heat conducting substrate and the fins of the heat pipe radiator has the following beneficial effects:
1. the technical scheme of collimation rectangular laser preheating and capacitance energy storage seam welding is adopted, when fins of aluminum, copper and alloy materials are welded, the electric conductivity of the aluminum and copper alloy is reduced through collimation laser preheating, the conversion rate of electric energy and heat energy in the capacitance energy storage seam welding process can be remarkably increased, and a contact interface is rapidly melted, so that a high-quality welding seam is obtained; meanwhile, the preheating effect can effectively avoid the outstanding problems of difficult welding, large deformation and the like caused by high heat conductivity and large linear expansion coefficient of aluminum and copper alloy, and the welded product has high forming quality, no defect of welding seams and small deformation;
2. the heat-conducting substrate 4 of the heat pipe radiator and the L-shaped fins 3 are welded by adopting a laser-capacitor energy-storage seam welding compound welding method, solder paste is not required to be coated in the welding process, and the problems of incomplete infiltration, air holes and the like which are easy to occur in solder paste reflow welding are avoided in large-area welding;
3. the welding method only carries out local heating on the area to be welded, and the reflow welding and the high-frequency induction heating welding method both need to carry out integral heating on the heat pipe radiator, so the invention has lower required heat power, higher energy utilization rate and lower cost.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but is intended to cover all equivalent structures modifications, direct or indirect application in other related arts, which are included in the scope of the present invention.
Claims (7)
1. A welding method for a welding device of a heat-pipe radiator heat-conducting substrate and a fin is characterized by comprising an adjustable rectangular collimation laser component and a capacitive energy-storage seam welder,
the adjustable rectangular collimation laser assembly comprises an optical fiber laser, an optical gate, a beam shaper and a collimation laser gun which are electrically connected in sequence, wherein the optical fiber laser is used for generating continuous laser with the intensity being in Gaussian distribution and inputting the optical gate, the optical gate is used for collimating and inputting the input Gaussian laser into the beam shaper, and the beam shaper is used for shaping the Gaussian laser into the laser with the intensity being in rectangular distribution and emitting the laser through the collimation laser gun;
the capacitor energy storage seam welder comprises a rectifier, a capacitor, a welding transformer and seam welding rollers which are electrically connected in sequence, wherein the rectifier is used for rectifying input power frequency alternating current and charging the capacitor, pulse current with low voltage and high energy density is obtained through the welding transformer after the capacitor is charged, and the seam welding rollers are used for discharging; the fin and the heat conducting substrate are made of aluminum, copper, aluminum alloy or copper alloy; the welding device for the heat-pipe radiator heat-conducting substrate and the fins also comprises a fixed base for installing the heat-conducting substrate, wherein the fixed base comprises a working platform for supporting the fixed base, and a transverse moving mechanism and a longitudinal moving mechanism which are connected with the working platform and respectively control the working platform to move transversely and longitudinally;
the welding method of the welding device for the heat conducting substrate and the fins of the heat pipe radiator comprises the following steps:
s1, performing spot welding pre-fixing on a welding narrow edge of an L-shaped fin and a heat conducting substrate;
s2, fixing the alignment laser gun in front of the rolling direction of the seam welding roller, adjusting the horizontal distance between the alignment laser gun and the seam welding roller, adjusting the alignment laser gun to keep vertical to the working platform, recording the X-axis coordinate of the alignment laser gun on the working platform, and setting the size of the rectangular light beam after shaping by the beam shaper;
s3, fixing the heat pipe radiator pre-fixed in the S1 on a working platform, moving the heat pipe radiator to coincide with an X-axis coordinate of the collimation laser gun through a first servo mechanism and a second servo motion mechanism, and adjusting the mounting height of the seam welding roller to enable the seam welding roller to be closely attached to the welding narrow side of the L-shaped fin;
s4, starting a welding device to start welding, wherein in the welding process, rectangular laser emitted by a collimated laser gun firstly preheats the welding narrow sides of the L-shaped fins, and after preheating, the seam welding roller performs energy storage seam welding;
s5, repeating the steps S1 to S4 until welding of all the L-shaped fins is completed.
2. The welding method of the welding device for the heat conducting substrate and the fins of the heat pipe radiator as claimed in claim 1, wherein when the welding narrow sides of the L-shaped fins and the heat conducting substrate are pre-fixed by spot welding:
and placing the narrow edge of the L-shaped fin in a region to be welded, and respectively performing primary capacitance spot welding on the starting position and the ending position of the narrow edge, wherein the capacitance electric welding current is 0.5kA-2kA.
3. The welding method of the welding device for the heat conducting substrate and the fins of the heat pipe radiator according to claim 1, wherein the width of the rectangular laser after being shaped by the beam shaper is smaller than or equal to the width of the narrow side of the L-shaped fins, and the material of the seam welding roller is tungsten alloy.
4. The welding method for a welding device for a heat-pipe radiator heat-conducting substrate and a fin according to claim 3, wherein when the material of the L-shaped fin is copper or copper alloy, the rectangular collimated laser power range is 300W-500W, the capacitive energy storage seam welding current range is 5kA-7kA, and the welding surface pressure range is 40MPa-60MPa.
5. The welding method for a welding device for a heat-pipe radiator heat-conducting substrate and a fin according to claim 3, wherein when the material of the L-shaped fin is aluminum or aluminum alloy, the rectangular collimated laser power range is 200W-400W, the capacitive energy storage seam welding current range is 3kA-5kA, and the welding surface pressure range is 40MPa-60MPa.
6. The welding method of the welding device for the heat conducting substrate and the fins of the heat pipe radiator according to claim 1, wherein the transverse moving mechanism comprises a first fixed bottom plate, a transverse screw rod, a transverse moving sliding block and a first servo moving mechanism, the transverse screw rod is positioned above the first fixed bottom plate, the transverse moving sliding block penetrates through the transverse screw rod, the first servo moving mechanism is connected with the transverse screw rod to drive the transverse screw rod to rotate, and the transverse moving sliding block is fixed below the working platform to support the working platform;
the longitudinal moving mechanism comprises a second fixed bottom plate, a longitudinal screw rod, a longitudinal moving sliding block and a second servo moving mechanism, wherein the longitudinal screw rod is positioned above the second fixed bottom plate, the longitudinal moving sliding block penetrates through the longitudinal screw rod, the second servo moving mechanism is connected with the longitudinal screw rod to drive the longitudinal screw rod to rotate, and the longitudinal moving sliding block is fixed below the first fixed bottom plate to support the first fixed bottom plate.
7. The method of claim 6, further comprising a controller electrically connected to the first servo motion mechanism and the second servo motion mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110761323.2A CN113510366B (en) | 2021-07-06 | 2021-07-06 | Welding device and welding method for heat conducting substrate and fins of heat pipe radiator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110761323.2A CN113510366B (en) | 2021-07-06 | 2021-07-06 | Welding device and welding method for heat conducting substrate and fins of heat pipe radiator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113510366A CN113510366A (en) | 2021-10-19 |
| CN113510366B true CN113510366B (en) | 2023-09-19 |
Family
ID=78067050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110761323.2A Active CN113510366B (en) | 2021-07-06 | 2021-07-06 | Welding device and welding method for heat conducting substrate and fins of heat pipe radiator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113510366B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104708188A (en) * | 2015-02-16 | 2015-06-17 | 陕西龙伸电气有限公司 | Welding technology of fuse element |
| CN107262893A (en) * | 2017-08-09 | 2017-10-20 | 唐山开元阻焊设备有限公司 | A kind of solar water heater heat-collecting plate seam welder |
| CN107442955A (en) * | 2017-08-24 | 2017-12-08 | 哈尔滨工业大学（威海） | A kind of laser auxiliary heating and immediately cleaning formula ultrasonic wave rapid molding device |
| CN111580203A (en) * | 2020-04-07 | 2020-08-25 | 江苏大学 | Device and method for preparing rectangular-structure grating by ultrafast laser direct writing |
| CN112475794A (en) * | 2020-11-10 | 2021-03-12 | 鞍钢股份有限公司 | Process for solving cracking problem of high-strength steel composite plate welded by vacuum electron beam |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT413667B (en) * | 2004-05-10 | 2006-04-15 | Fronius Int Gmbh | WELDING PROCESS AND LASER HYBRID WELDING BURNER |
-
2021
- 2021-07-06 CN CN202110761323.2A patent/CN113510366B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104708188A (en) * | 2015-02-16 | 2015-06-17 | 陕西龙伸电气有限公司 | Welding technology of fuse element |
| CN107262893A (en) * | 2017-08-09 | 2017-10-20 | 唐山开元阻焊设备有限公司 | A kind of solar water heater heat-collecting plate seam welder |
| CN107442955A (en) * | 2017-08-24 | 2017-12-08 | 哈尔滨工业大学（威海） | A kind of laser auxiliary heating and immediately cleaning formula ultrasonic wave rapid molding device |
| CN111580203A (en) * | 2020-04-07 | 2020-08-25 | 江苏大学 | Device and method for preparing rectangular-structure grating by ultrafast laser direct writing |
| CN112475794A (en) * | 2020-11-10 | 2021-03-12 | 鞍钢股份有限公司 | Process for solving cracking problem of high-strength steel composite plate welded by vacuum electron beam |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113510366A (en) | 2021-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100425384C (en) | Method for connecting heterogeneous metals by large-facula laser and electric arc combined heat source | |
| KR20190012175A (en) | Method of welding visible laser to semiconductor packaging, automotive electrical equipment, battery and other parts | |
| CN111673281B (en) | A welding method for aluminum/steel dissimilar metal welding using three-beam lasers | |
| CN112453705A (en) | Thick plate titanium alloy narrow gap double-laser-beam powder filling welding method | |
| CN106112166A (en) | Automated system that metalwork welds with coaxial cable and implementation method | |
| CN107803593B (en) | high-frequency-laser wire filling composite welding device and method | |
| CN110587127A (en) | Method for welding battery tab and bus bar | |
| CN102554451B (en) | Bilateral ultrasonic welder | |
| CN110899934A (en) | Temperature adjusting device and adjusting method for electric arc additive manufacturing | |
| CN113510366B (en) | Welding device and welding method for heat conducting substrate and fins of heat pipe radiator | |
| CN117655525B (en) | Automatic welding method and device for power battery connecting sheet | |
| CN105382417A (en) | Different-mode laser welding method for aluminum-lithium alloy sheet T-shaped connector | |
| CN114559156A (en) | A battery string welding device and welding equipment | |
| CN114248000B (en) | Welding method and system | |
| CN106425103A (en) | Infrared laser welding method for nonferrous metals | |
| CN211539880U (en) | Temperature regulating device for electric arc additive manufacturing | |
| CN113172339A (en) | A kind of medium and heavy plate aluminum/steel dissimilar metal laser wire filling welding method | |
| CN113927121B (en) | Photovoltaic module diode tin pre-storage device based on crest welder | |
| CN113725126B (en) | Integrated circuit packaging wire bonding system and method thereof | |
| CN205996345U (en) | The automated system that metalwork is welded with coaxial cable | |
| CN116618774A (en) | Device and method for induction brazing repair of micro-cracks on blade surface | |
| CN111408834B (en) | Device and method for on-line laser post-heat treatment of cold metal transfer welding | |
| CN204657742U (en) | A kind of optical path adjusting system based on micro two-dimensional slide unit for laser-beam welding machine | |
| CN114273757A (en) | Automatic welding seam tracking device for heat exchanger | |
| CN222133833U (en) | Laser welding clamping device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |