CN1267238C - Laser-high frequency induction composite welder and its method - Google Patents

Laser-high frequency induction composite welder and its method Download PDF

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Publication number
CN1267238C
CN1267238C CN 200310111658 CN200310111658A CN1267238C CN 1267238 C CN1267238 C CN 1267238C CN 200310111658 CN200310111658 CN 200310111658 CN 200310111658 A CN200310111658 A CN 200310111658A CN 1267238 C CN1267238 C CN 1267238C
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China
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laser
welding
load coil
frequency induction
temperature
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CN 200310111658
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Chinese (zh)
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CN1554510A (en
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王春明
胡席远
刘建华
胡伦骥
陈俐
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华中科技大学
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Abstract

The present invention relates to a device combining two thermal sources of laser and high-frequency induction to carry out welding and a method thereof. Aiming at the problem that metal material has low energy utilization rate of laser, and molten metal easily generates air holes or hollow holes and easily generates cracks, the present invention provides a compound welding device of laser and high-frequency induction with real-time monitoring of temperature and a method thereof, and the thermal sources are used to synchronously heat welding seams and adjacent areas. The main body of the compound welding device of laser and high-frequency induction with real-time monitoring of temperature is a laser welding head which is integrated with induction heating coils and an infrared temperature sensor. Compared with common laser welding, the method has the advantages of improved productive efficiency and improved welding quality and achieves two-dimensional welding and three-dimensional welding.

Description

Laser-high-frequency induction composite welding devices and methods therefor

Technical field

The present invention relates to device and the welding method thereof of using laser and two kinds of thermals source of high-frequency induction to combine and weld.

Background technology

Laser weld has the speed of welding height, welding seam deep width ratio is big, the heat affected area is little, distortion is little, be easy to characteristics such as automation, in industry, has especially obtained in fields such as automobile, metallurgy, Aero-Space and national defence using widely.Yet when laser welding technology is widely used, certain limitation is arranged also: many metal materials are little to reflectivity height, the absorptivity of laser, and capacity usage ratio is low; Laser is short to action time of mother metal, and the motlten metal setting rate is very fast, and especially at high-aspect-ratio weld seam or non-when penetrating welding, the metal vapors in the weld seam and the environmental gas of suction are difficult for all overflowing, and the result often forms pore or cavity; The hot input quantity of laser weld is more much smaller than conventional method, the cooling velocity of weld metal is very fast, thereby for materials such as medium and high carbon steel or high alloys, the martensite hardened structure very easily appears in weld seam and welding heat affected zone, makes the deterioration of welding point combination property and is easy to generate crackle.

Above-mentioned shortcoming has limited laser welding technology to a certain extent and has used more widely, and one of solution to the problems described above is aided with the high-frequency induction thermal source exactly in laser beam welding.High-frequency electromagnetic induction is a kind of method that the inner eddy current resistance heat that produces of workpiece heats that depends on, firing rate is fast, equally with laser belong to the heating of untouchable environment-friendly type, but use induction welding separately because kelvin effect generally only is adapted to the butt joint of thin-wall pipes circumferential weld or longitudinal joint.

Existing people carries out the stainless steel tube welding with high-frequency induction and common use of two kinds of thermals source of laser in the actual production abroad, promptly before laser weld with high-frequency induction to by whole section preheating of welded tube material, though played the effect of improving joint fusion-penetration and improving speed, but this device is only used high-frequency induction as preheating, heating region not only comprises welded seam area, also comprise the mother metal away from weld seam, hot input quantity will make welding heat affected zone enlarge greatly, and may certain harmful effect be arranged to mother metal; Preheat temperature is failed to realize real-time monitoring, in case process conditions change (as the distance of load coil and workpiece), weld structure and performance will change, and the stability of technology and repeatability are relatively poor; And this device only can weld tubing under the condition that the welded tube straight line moves and plumb joint (comprising laser head and load coil) is fixing, and a large amount of flat boards welding of using in the inapplicable actual production more impossiblely are used for welding the three-dimensional weld seam of two peacekeepings.

Summary of the invention

Also further give full play to the laser weld advantage at the not enough of above-mentioned laser weld, the invention provides a kind of temperature laser-high-frequency induction composite welding apparatus and method of monitoring in real time that have, synchronously with two kinds of thermals source heating weld seams and adjacent domain.

The critical piece of laser of the present invention-high-frequency induction composite welding device comprises high-frequency induction heating coil (7), infrared temperature sensor (10), laser welding system (12), high frequency induction power supply (6) and the real time temperature monitoring module (5) that (as Fig. 1 or shown in Figure 2) and laser use synchronously.Load coil is secondary mutually integrated with laser welding system by a gear (4) tooth bar (3), and its middle rack is fixed in the laser welding system, and load coil and gear are fixed together by hold-down support (13).Infrared temperature sensor (10) is clamped in the laser welding system by a dovetail groove (11).Like this, load coil (7), infrared temperature sensor (10), laser welding system (12) three integrate composition laser-high-frequency induction composite welding head.The load coil that is contained on the laser head adopts cable to be connected with high frequency electric source, and its length is as the criterion with the needs that satisfy the welding stroke.This laser-high-frequency induction composite welding head can integral body be done straight line, curve even three-dimensional moving.Above-mentioned load coil adopts the red copper rhs-structure, and interior logical recirculated water cooling is flat on the workpiece surface top, and height can pass through gear (4) tooth bar (3) up-down adjustment, and making itself and surface of the work distance is 1~3mm; The relative laser welding system horizontal direction of load coil has two installation sites: beam center drops on load coil inside (as Fig. 1) or beam center drops on load coil outside (as Fig. 2).The relative distance of infrared temperature sensor and laser welding system can be regulated between 5~35mm by a dovetail groove (11), and its angle can be regulated between 15~75 ° by the clamping screw (14) of sensor.

High frequency induction power supply adopts full solid-state device, uses latest digital Phase Lock Technique and resonant vibration frequency conversion technology, and the cancellation electron tube adopts integrated circuit and power model, realizes automatic frequency tracking.

Utilize laser of the present invention-high-frequency induction composite welding device, provide a kind of, laser and two thermals source of high-frequency induction are integrated in one, can realize the same moved further heating weld seam and the adjacent domain of straight line, curve, three-dimensional welding and have the temperature laser-high-frequency induction complex welding method of monitoring in real time.

Welding method concrete steps of the present invention are as follows: the relative position of 1. adjusting load coil and laser head according to workpiece shape and material, when laser at the load coil external action during in workpiece (as shown in Figure 2), high permeability material ferrite (15) is equipped with in load coil inside; 2. adjust the angle and the position of infrared temperature sensor, make it to aim at tested zone, set the control temperature; 3. load coil and laser heat workpiece jointly, and laser beam acts on the weld metal zone, because its high-energy-density penetration capacity is strong, can gos deep into workpiece inside and add the thermosetting deep penetration welding.Load coil is gone back the butt welded seam peripheral region and is heated synchronously except the heating of butt welded seam district, is equivalent to a plane heat source.The hot input quantity size of eddy-current heating is carried out the self adaptation adjusting by the monitoring temperature module, to guarantee the stability of welding procedure.The temperature that eddy-current heating can make workpiece reach can be regulated between 150 ℃~1500 ℃ continuously.

Welder of the present invention also comprises a cover induction heating temperature real-time monitoring system, different according to embodiment with actual instructions for use, the zone of infrared temperature sensor monitoring is also different, the method of work of real time temperature monitoring module (5) is: when load coil and laser acting in conjunction during in the weld metal zone (as Fig. 1), monitor weld seam one side near zone temperature in real time; When load coil is used as synchronous preheating or after heat (as Fig. 2), monitor before weld in the laser action district on the workpiece in real time or the temperature of postwelding.The temperature signal that infrared temperature sensor is obtained is regulated the output current of induction power supply in real time as the input quantity of high frequency electric source control module, to adjust its hot input quantity, realizes the control of this regional temperature.The output current of induction power supply can be between 600~2000A step-less adjustment.

The present invention combines the advantage of laser and two kinds of thermals source of high-frequency induction, and its main advantages has:

(1) the high-frequency induction thermal source is not only participated in the heat fused of mother metal directly, thereby and make the rising of workpiece material temperature improve the absorptivity of material for laser light, effectively utilized expensive Laser Power Supply, production efficiency improves greatly than the common laser welding;

(2) can be implemented in the bigger fusion penetration of acquisition under the low laser power;

(3) local eddy-current heating has also improved weld seam peripheral region temperature, under the prerequisite that does not influence the mother metal structure property, reduced the thermograde of weld seam and peripheral region, make the solid-state cooling procedure of solidifying become slow with subsequently, improve the microstructure after welding, improve the weld seam combination property, reduce or eliminate the generation of pore and crackle, especially can improve the weldability of difficult wlding material such as high-carbon steel, high-alloy steel;

(4) the real-time monitoring of temperature more can be guaranteed stability and the reliability that product is made;

(5) applicable to the welding of straight line, two and three dimensions weld seam.

Description of drawings

Accompanying drawing 1: laser-high-frequency induction composite welding embodiment one schematic diagram, among the figure: 1 laser condensing lens, 2 laser beams, 3 tooth bars, 4 gears, 5 real time temperature monitoring modules, 6 high frequency induction power supplies, 7 load coils, 8 welding work pieces, 9 weld seams, 10 infrared temperature sensors, 11 dovetail grooves, 12 laser welding systems, 13 hold-down supports, 14 clamping screws.

Accompanying drawing 2: laser-high-frequency induction composite welding embodiment two schematic diagrames, among the figure: 1 laser condensing lens, 2 laser beams, 3 tooth bars, 4 gears, 5 real time temperature monitoring modules, 6 high frequency induction power supplies, 7 load coils, 8 welding work pieces, 9 weld seams, 10 infrared temperature sensors, 11 dovetail grooves, 12 laser welding systems, 13 hold-down supports, 14 clamping screws, 15 ferrites.

The specific embodiment

In order to realize laser of the present invention-high-frequency induction composite welding, at first need a solid YAG or CO 2Laser instrument and can transmit the light path of laser, and a HF induction heating apparatus.

Below in conjunction with instantiation explanation laser-high-frequency induction composite welding embodiment.

Scheme one: as shown in Figure 1, load coil (7) and the synchronous heated parts welding region of laser beam (2), central role that the laser beam after the focusing (2) passes load coil forms deep penetration welding in the weld metal zone.The distance of induction coil and workpiece surface is 2mm, and the energy part of load coil directly forms weld seam (9) in the heating and fusing district, and another part is used to heat weld seam (9) peripheral region.Infrared temperature sensor (10) is 35 ° with plumb joint main shaft angle, near the workpiece temperature monitoring weld seam one side induction coil, the control load coil remains on an OK range to the hot input quantity of workpiece, guarantees the weld seam slow cooling under the prerequisite of avoiding the overheated or damage mother metal structure property in heat affected area.The thick 30CrMnSiA of embodiment one welding 2.5mm, induced-current 1100A, induction heating temperature are controlled at 330 ℃, and the laser weld that non-inductive heating participates under welding penetration and the same process parameter is compared, and fusion penetration is brought up to 2.5mm by 2.1mm.

Scheme two: as shown in Figure 2, load coil in this scheme (7) and laser beam (2) certain position that staggers, laser beam drops on the outside about 3mm of load coil place, the distance of induction coil and workpiece surface is 3mm, difference according to welding direction, load coil provides synchronous preheating or after heat for laser weld: when load coil placed the place ahead, weld zone, load coil was treated welding zone prior to laser and is heated, and synchronous induction preheating is provided; When welding in the other direction, laser heats the fusion area prior to load coil, and the load coil butt welded seam provides synchronous after heat, and infrared temperature sensor (10) is 20 ° with plumb joint main shaft angle, the monitoring fusion area welds preceding or postwelding temperature in real time, with control preheating or postheat temperature.Scheme two is particularly conducive to the joint microstructure performance of difficult wlding material such as improving high-carbon steel, high-alloy steel.Embodiment two has successfully been welded the thick T10 same tool steel plate of 3mm, and induced-current 1800A, induction heating temperature are controlled at 500 ℃.

Claims (6)

1. a laser soldering device is characterized in that, the parts of this device comprise: high-frequency induction heating coil (7), infrared temperature sensor (10), laser welding system (12), high frequency induction power supply (6) and real time temperature monitoring module (5); Load coil is secondary mutually integrated with laser welding system by a gear (4) tooth bar (3), and its middle rack is fixed in the laser welding system, and load coil and gear are fixed together by hold-down support (13); Infrared temperature sensor (10) is by in the sub-laser welding system of a dovetail groove (11) clamping.
2. according to the described laser soldering device of claim 1, it is characterized in that, described load coil adopts the red copper rhs-structure, interior logical recirculated water cooling, be flat on the workpiece surface top, height can pass through gear (4) tooth bar (3) up-down adjustment, and making it is that the relative laser welding system horizontal direction of 1~3mm load coil has two installation sites with the surface of the work distance: beam center drops on load coil inside or beam center drops on the load coil outside.
3. according to the described laser soldering device of claim 1, it is characterized in that, the relative distance of described infrared temperature sensor and laser welding system is regulated by a dovetail groove (11), and its angle can be regulated between 20~35 ° by the clamping screw (14) of sensor.
4. the method for recombination laser welding, it is characterized in that, laser and two thermals source of high-frequency induction are integrated in one, can realize the same moved further heating weld seam and the adjacent domain of straight line, curve, three-dimensional welding and have the temperature laser-high-frequency induction complex welding method of monitoring in real time.
5. the method for recombination laser welding, its concrete steps are as follows: the relative position of 1. adjusting load coil and laser head according to workpiece shape and material, when laser at the load coil external action during in workpiece, high permeability material ferrite (15) is equipped with in load coil inside; 2. the temperature signal that obtains with infrared temperature sensor is as the input quantity of high frequency electric source control module, regulate the output current of induction power supply in real time, to adjust its hot input quantity, realize the welding region temperature controlling, adjust the angle and the position of infrared temperature sensor, set surveyed area and control temperature; 3. load coil and laser heat workpiece jointly, and laser beam acts on the weld metal zone, and load coil is gone back the butt welded seam peripheral region and heated synchronously except the heating of butt welded seam district.
6. according to the described laser welding method of claim 5, it is characterized in that, described load coil energy heated parts, and the temperature of workpiece is regulated between 150 ℃~1500 ℃ continuously.
CN 200310111658 2003-12-26 2003-12-26 Laser-high frequency induction composite welder and its method CN1267238C (en)

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Application Number Priority Date Filing Date Title
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CN1267238C true CN1267238C (en) 2006-08-02

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