CN110625260B - Welding method of laser-low current welding wire spontaneous induction electric arc hybrid welding system - Google Patents
Welding method of laser-low current welding wire spontaneous induction electric arc hybrid welding system Download PDFInfo
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Abstract
A welding method of a laser-low current welding wire spontaneous induction arc hybrid welding system comprises a laser head, a wire feeding mechanism, a welding wire, a shielding gas device, a constant voltage characteristic power supply and an arc control center; the wire feeding mechanism comprises a ring electrode suitable for narrow gap, a conductive wire feeding wheel and a wire feeding nozzle; in the welding process, a constant-voltage characteristic power supply outputs a small current, a wire feeding mechanism feeds a welding wire, the welding wire spontaneously induces an electric arc on the surface of a workpiece to be welded and is combined with a laser beam generated by a laser head to weld; the arc control center monitors the current of the electric loop in the welding process in real time through the constant voltage characteristic power supply, and adjusts the feeding action of the welding wire of the wire feeding mechanism and the output current of the constant voltage characteristic power supply according to the current so as to maintain the stability of the arc. The welding system can introduce electric arc into a high restraint space in the process of welding large thick plates with ultra-narrow gaps, generate a synergistic enhancement effect with laser, and combine the advantages of laser-electric arc hybrid welding and laser filler wire welding.
Description
Technical Field
The invention relates to a welding method of a laser-low current welding wire spontaneous induction arc hybrid welding system, belonging to the technical field of welding.
Background
At present, based on the problem of aluminum alloy laser welding, laser absorption rate and bridging capacity can be improved by adopting laser-arc hybrid welding, and the welding defects of aluminum alloy are inhibited, but the laser-arc hybrid welding technology is limited by the size of a welding gun, is only suitable for welding with the thickness of less than 20mm, and is difficult to adapt to ultra-narrow gap welding of large and thick plates with the thickness of more than 20 mm.
The laser filler wire welding can adapt to ultra-narrow gap welding of large and thick plates, but the welding process parameter interval is small, the welding efficiency is relatively low compared with composite welding, and the defect problems of incomplete fusion and the like are easy to occur.
In addition, the plasma generated by the arc in the laser-arc hybrid welding can dilute the particle density of the light-induced plasma and reduce the shielding effect of the light-induced plasma, thereby greatly improving the energy transmission and absorption efficiency of the laser beam.
Disclosure of Invention
The invention aims to provide a welding method of a laser-low current welding wire spontaneous induction arc hybrid welding system, which can introduce an arc into a high-restraint space in a large thick plate ultra-narrow gap welding process and generate a synergistic enhancement effect with laser, and combines the advantages of laser arc hybrid welding and laser filler wire welding.
The invention adopts the technical scheme that the invention achieves the aim that: a welding method of a laser-low current welding wire spontaneous induction arc hybrid welding system, the hybrid welding system comprises a laser head for generating laser beams, a wire feeding mechanism capable of adjusting the feeding speed of the welding wire in real time, the welding wire and a shielding gas device, and the welding method is structurally characterized in that: the wire feeding mechanism comprises a ring electrode suitable for narrow gaps, a conductive wire feeding wheel used for restricting the position of a welding wire, assisting in wire feeding and realizing the electric connection of the ring electrode and the welding wire, a wire feeding nozzle for restricting the feeding position of the welding wire and a wire feeder connected with the ring electrode; the composite welding system also comprises a constant voltage characteristic power supply and an arc control center, wherein the anode of the constant voltage characteristic power supply is electrically connected with the annular electrode of the wire feeding mechanism, and the cathode of the constant voltage characteristic power supply is electrically connected with a workpiece to be welded;
in the welding process, a constant-voltage characteristic power supply outputs a small current, a wire feeding mechanism feeds a welding wire, the welding wire spontaneously induces an electric arc on the surface of a workpiece to be welded and is combined with a laser beam generated by a laser head to weld; constant voltage characteristic power, ring electrode, electrically conductive wire feeding wheel, welding wire and wait to weld and form electric loop between the work piece, electric arc control center passes through the electric current size of constant voltage characteristic power real-time supervision welding in-process electric loop to welding wire feeding action and the output current of constant voltage characteristic power are in order to maintain electric arc stability according to electric current size regulation wire feeding mechanism's welding wire, specifically include:
in the welding process, a wire feeding mechanism feeds welding wires at a set welding wire feeding speed, and a liquid droplet at the tip of the welding wire contacts the surface of a workpiece to be welded to form short-circuit current in a current loop; when the constant-voltage characteristic power supply monitors that short-circuit current occurs in an electric circuit, the electric arc control center controls the current increase speed by adjusting the output current of the constant-voltage characteristic power supply to prevent molten drops from being exploded rapidly, and meanwhile, the driving force for molten drop separation is increased by reducing the welding wire feeding speed of a wire feeding mechanism, so that liquid molten drops at the tip of a welding wire are separated from the welding wire rapidly and are transferred into a molten pool of a workpiece to be welded to complete one molten drop transition; after the molten drops are transited, the welding wire is separated from the surface of a workpiece to be welded to ignite an electric arc; and when the constant voltage characteristic power supply monitors that the current in the electric circuit is reduced to a set minimum current value, the arc control center controls the wire feeding mechanism to restore the wire feeding speed to the set wire feeding speed.
When the welding is started, the liquid droplet at the tip of the welding wire is formed by the action of resistance heat and laser beam heat after the welding wire is firstly contacted with the surface of a workpiece to be welded, and the liquid droplet at the tip of the welding wire is formed by the action of arc heat and laser beam heat in the welding process.
The operation of the arc control center is described in detail below in connection with the welding process:
s1, starting welding, initializing a program, and setting system parameters (the system parameters comprise parameters such as welding wire feeding speed, output current of a constant-voltage characteristic power supply in a welding stable stage, and a minimum current value required to recover the welding wire feeding speed to a set value), wherein the constant-voltage characteristic power supply loads constant voltage (when starting welding, before the welding wire is firstly contacted with the surface of a workpiece to be welded, an electric loop is not closed, no current is formed, after the welding wire is firstly contacted with the surface of the workpiece to be welded, a small current in the electric loop is kept through the constant-voltage characteristic power supply), a wire feeding mechanism feeds the welding wire at the set welding wire feeding speed, when the welding wire is contacted with the surface of the workpiece to be welded, a short-circuit current is formed in the electric loop, and the tip of the welding wire; the arc control center controls the current increase speed by adjusting the output current of the constant-voltage characteristic power supply to prevent molten drops from being exploded rapidly, and simultaneously increases the driving force for molten drop separation by reducing the welding wire feeding speed of the wire feeding mechanism to ensure that liquid molten drops at the tip of a welding wire are separated from the welding wire rapidly and are transited to a molten pool of a workpiece to be welded to complete first molten drop transition; separating the welding wire from the surface of the workpiece to be welded after the molten drop is transited and igniting the electric arc;
s2, forming liquid molten drops by the tip of the welding wire under the action of arc heat and laser beam heat, increasing the distance between the tip of the welding wire and a workpiece to be welded along with the reduction of the feeding speed of the welding wire, lengthening the arc, and rapidly reducing the current in the circuit monitored by the constant-voltage characteristic power supply;
s3, when the current in the electric loop is reduced to the set minimum current value, the wire feeding speed is recovered to the set wire feeding speed;
s4, enabling the liquid molten drop at the tip of the welding wire to contact the surface of a workpiece to be welded, forming short-circuit current in a current loop, extinguishing an electric arc, monitoring the short-circuit current in the current loop by a constant-voltage characteristic power supply, controlling the current increasing speed by an electric arc control center by adjusting the output current of the constant-voltage characteristic power supply, preventing the molten drop from being exploded rapidly, and increasing the driving force for separating the molten drop by reducing the feeding speed of the welding wire of a wire feeding mechanism to enable the liquid molten drop at the tip of the welding wire to be separated from the welding wire rapidly and to be transferred into a molten pool of the workpiece to be welded so as to complete one;
s5, separating the welding wire from the surface of the workpiece to be welded after the molten drop is transited, igniting the electric arc, and circulating the steps S2-S4.
The set wire feeding speed and the set minimum current value are obtained through pre-experiments, welding materials, sizes, welding requirements and the like are different, and the set wire feeding speed and the minimum current value are also different.
Compared with the prior art, the invention has the beneficial effects that:
the invention is based on laser wire-filling welding, and improves the wire feeding mechanism of the laser wire-filling welding, and the welding wire can spontaneously induce electric arc on the surface of a workpiece to be welded by inputting low current to the welding wire through a constant voltage characteristic power supply, an annular electrode and a conductive wire feeding wheel; compared with the traditional laser wire filling welding, the laser-low current welding wire spontaneous induction electric arc hybrid welding can improve the laser absorption rate and bridging capacity, and inhibit welding defects, particularly non-fusion defects in large and thick aluminum alloy plates.
Secondly, the common laser-arc hybrid welding technology is limited by the size of a welding gun and is only suitable for welding the plate thickness of less than 20 mm. According to the invention, through design, a welding gun with larger space volume is removed, the purpose of arc welding is achieved by improving the wire feeding mechanism of laser wire filling welding, the front end of the improved wire feeding mechanism can penetrate into the high constraint space of the ultra-narrow gap of a large thick plate to complete welding, and the ratio of the thickness of the workpiece plate to the gap of the break is more than or equal to 10: 1. in addition, welding heat input can be effectively reduced by spontaneously inducing the arc with low current, and alloy element loss, weld joint structure deterioration, welding deformation and the like caused by excessive heat input are prevented.
The plasma generated by the spontaneous induced arc of the low-current welding wire can dilute the particle density of the light-induced plasma and reduce the shielding effect of the light-induced plasma, so that the energy transmission and absorption efficiency of the laser beam is greatly improved.
And fourthly, the arc control center monitors the current of an electric loop in the welding process in real time through the constant-voltage characteristic power supply, and adjusts the welding wire feeding action of the wire feeding mechanism and the output current of the constant-voltage characteristic power supply according to the current to maintain the stability of the arc, so that the problems of molten drop explosion, welding splash, transient instability of a circuit and the like caused by the concentration of heat at the molten drop part of the front end of the welding wire and the surface of a workpiece to be welded are avoided, the stability of the arc is maintained through the control of molten drop transition, and the welding quality is ensured. The principle of reducing the welding wire feeding speed of the wire feeding mechanism and increasing the driving force for separating molten drops is as follows: after the feeding speed of the welding wire is reduced, the liquid molten drops at the tips of the welding wire are continuously fed at the original speed due to inertia, and the separation driving force and the molten drop transition frequency between the tips of the welding wire and the liquid molten drops are increased along with the reduction of the feeding speed. Thereby controlling the driving force and frequency of droplet transition (i.e. the more the wire feed speed is slowed down, the faster the droplet separates from the wire) by adjusting the wire feed speed. The control range of the welding wire feeding speed is-10 m/min to +30m/min, and the fact that the welding wire feeding speed is reduced to a negative value represents that the welding wire is changed from a state of being fed to a workpiece to be welded into a drawing-back state.
In a word, the invention combines the advantages of laser-arc hybrid welding and laser filler wire welding, introduces the electric arc into a high-restraint space in the process of welding the large and thick plates with the ultra-narrow gap through the design of the annular electrode and the conductive wire feeding wheel and generates a synergistic enhancement effect with the laser, provides an introduction mode based on the low-current welding wire to induce the electric arc, constructs a new method for spontaneously inducing the electric arc by the low-current welding wire for laser hybrid welding, and solves the welding problem of the large and thick plates with the ultra-narrow gap.
Furthermore, the annular electrode shell is an insulating cylindrical shell, the outer diameter of the cylindrical shell is 10-20 mm, the wall thickness of the cylindrical shell is 1.2-2.5 mm, and the diameter of the conductive wire feeding wheel is 4.5-9.5 mm.
The size design not only can adapt to the welding of the large thick plate ultra-narrow gap component, but also can ensure the stable feeding of the welding wire and the stability of spontaneous induction electric arc.
Further, when the constant voltage characteristic power supply monitors that the current in the electric loop is reduced to a set minimum current value, the distance between the tip of the welding wire and the surface of the workpiece to be welded is 0.5-2 mm.
Experiments prove that the welding wire and the workpiece to be welded are controlled to keep the proper distance, so that the phenomenon that the welding quality is influenced by instability, blow, arc blowout and the like of the arc caused by overlong arc can be prevented, and the phenomena that the welding wire is adhered to the workpiece to be welded, short circuit is generated, molten drops are exploded and the like can be avoided.
Further, the range of the output current of the constant voltage characteristic power supply is 0-100A.
By adopting the current range, the welding heat input can be effectively reduced, and the burning loss of alloy elements in workpieces and welding wires can be prevented; the overheating of the wire feeding and conducting mechanism caused by the overlarge power is prevented; the molten drop transition is improved, so that the molten drop transition is more stable; the generated electric arc can dilute the light-induced plasma and generate a coupling enhancement effect by being compounded with the laser.
Furthermore, in the welding process, the distance between the action point of the laser beam and the tip of the welding wire is-3 mm to +3 mm.
Experiments prove that in the laser-low current welding wire spontaneous induction arc hybrid welding, the molten drop transition mode can be ensured to be a more stable liquid bridge transition mode under the light wire spacing of-3 mm to +3mm, the molten drop transition frequency is high, the welding seam appearance is better, and the distribution of alloy elements in a molten pool is more uniform.
Drawings
FIG. 1 is a schematic diagram of spontaneous arc induction of a low current welding wire according to an embodiment of the present invention.
FIG. 2 is an enlarged schematic view of the front end interior of the wire feeder according to the embodiment of the present invention.
FIG. 3 is a schematic diagram of the overall structure of the laser-low current welding wire spontaneous induction arc hybrid welding according to the embodiment of the present invention
In the figure, 1 is a ring electrode, 2 is a conductive wire feeding wheel, 3 is a welding wire, 4 is a wire feeding nozzle, 5 is a conductive wire feeding wheel fixing shaft, 6 is a constant voltage characteristic power supply, 7 is an induced arc, 8 is a workpiece to be welded, 9 is a wire feeder, 10 is a laser head, 11 is a shielding gas guide pipe of a shielding gas device, and 12 is a narrow gap groove.
Fig. 4 is a schematic view of a control flow of droplet transfer in the hybrid welding system according to the embodiment of the present invention.
FIG. 5 is a schematic diagram of a welding output current signal according to an embodiment of the present invention.
Detailed Description
Examples
A welding method of a laser-low current welding wire spontaneous induction arc hybrid welding system, the hybrid welding system comprises a laser head for generating laser beams, a wire feeding mechanism capable of adjusting the feeding speed of the welding wire in real time, the welding wire and a shielding gas device, and the welding method is structurally characterized in that: the wire feeding mechanism comprises a ring electrode 1 suitable for a narrow-gap groove 12, a conductive wire feeding wheel 2 used for restricting the position of a welding wire 3, assisting wire feeding and realizing the electric connection of the ring electrode 1 and the welding wire 3, a wire feeding nozzle 4 for restricting the feeding position of the welding wire 3 and a wire feeder 9 connected with the ring electrode 1; the composite welding system also comprises a constant voltage characteristic power supply 6 and an arc control center, wherein the positive electrode of the constant voltage characteristic power supply 6 is electrically connected with the annular electrode 1 of the wire feeding mechanism, and the negative electrode of the constant voltage characteristic power supply 6 is electrically connected with the workpiece 8 to be welded;
in the welding process, a constant-voltage characteristic power supply 6 outputs small current, a wire feeding mechanism feeds a welding wire 3, shielding gas is conveyed to a welding position through a shielding gas guide pipe 11 of a shielding gas device and forms a shielding atmosphere for the welding wire, and the welding wire 3 spontaneously induces an electric arc 7 on the surface of a workpiece 8 to be welded and is compounded with a laser beam generated by a laser head 10 for welding; FIG. 1 is a schematic diagram of the spontaneous arc induction of the low current welding wire of the present example. In the figure, 5 is a conductive feed roller fixing shaft for fixing the conductive feed roller 2 inside the ring electrode 1. FIG. 2 is an enlarged view of the front end of the wire feeder according to this embodiment. Fig. 3 is a schematic view of the general structure of the laser-low current welding wire spontaneous induction arc hybrid welding, and the drawing is a schematic view of the invention, and the parts of the device irrelevant to the invention, such as the shielding gas cylinder and the like, are omitted.
Constant voltage characteristic power supply 6, ring electrode 1, electrically conductive wire feeding wheel 2, welding wire 3 and wait to weld and form electric loop between the work piece 8, arc control center passes through the current size of constant voltage characteristic power supply 6 real-time supervision welding in-process electric loop to the welding wire that adjusts wire feeding mechanism according to the current size is sent action and constant voltage characteristic power supply 6's output current and is stable in order to maintain electric arc, specifically includes:
in the welding process, the wire feeding mechanism feeds the welding wire 3 at a set welding wire feeding speed, and a liquid droplet at the tip of the welding wire contacts the surface of a workpiece 8 to be welded to form short-circuit current in a current loop; when the constant voltage characteristic power supply 6 monitors that short-circuit current occurs in an electric circuit, the electric arc control center controls the current increase speed by adjusting the output current of the constant voltage characteristic power supply 6, so as to prevent molten drops from being exploded rapidly, and meanwhile, the driving force for molten drop separation is increased by reducing the welding wire feeding speed of a wire feeding mechanism, so that liquid molten drops at the tip of a welding wire are separated from the welding wire 3 rapidly and are transferred into a molten pool of a workpiece to be welded, and one molten drop transition is completed; after the molten drops are transited, the welding wire 3 is separated from the surface of the workpiece 8 to be welded to ignite electric arcs; and when the constant voltage characteristic power supply 6 monitors that the current in the electric loop is reduced to a set minimum current value, the arc control center controls the wire feeding mechanism to restore the wire feeding speed to the set wire feeding speed.
Fig. 4 is a schematic diagram of a droplet transfer control flow of the hybrid welding system according to the embodiment, and it can be seen from fig. 4 that the specific operation mode of the arc control center is shown, and the corresponding welding output current signal in the control process is shown in fig. 5, and the operation mode of the arc control center is described in detail below in connection with the welding process:
s1, starting welding, initializing a program, setting system parameters, loading constant voltage by a constant voltage characteristic power supply, acquiring the current value of a loop in real time synchronously in the welding process, feeding a welding wire by a wire feeding mechanism at a set welding wire feeding speed, and forming short-circuit current in a current loop when the welding wire contacts the surface of a workpiece to be welded, namely monitoring the current I>0, forming a liquid molten drop by the tip of the welding wire under the action of resistance heat and laser beam heat; the constant voltage characteristic power supply monitors the short circuit current in the circuit, and the current signal is characterized by t in figure 51-t2The arc control center controls the current increase speed by adjusting the output current of the constant-voltage characteristic power supply to prevent molten drops from being exploded rapidly, and simultaneously increases the driving force for molten drop separation by reducing the welding wire feeding speed of the wire feeding mechanism to ensure that liquid molten drops at the tips of the welding wires are separated from the welding wires rapidly and are transferred to a molten pool of a workpiece to be welded to complete first molten drop transition; separating the welding wire from the surface of the workpiece to be welded after the molten drop is transited and igniting the electric arc;
s2, the tip of the welding wire forms liquid molten drops under the action of arc heat and laser beam heat, the distance between the tip of the welding wire and a workpiece to be welded is increased along with the reduction of the feeding speed of the welding wire, the arc is lengthened, the current monitored by the constant voltage characteristic power supply in the electric circuit is rapidly reduced, and the current signal characteristic is t in fig. 52-t3A segment;
s3, when the current in the electric loop is reduced to the set minimum current value, the current signal is characterized by t in figure 53-t4And a step of restoring the welding wire feeding speed to a set welding wire feeding speed, wherein the arc size and the welding current value are relatively stable in a relatively stable stage in the welding process, the current is controlled to be a set welding output current value (the set constant voltage characteristic power supply output current in the stable welding stage), and the current signal characteristic is t in the graph of fig. 55-t6A segment;
s4, the liquid droplet at the tip of the welding wire contacts the surface of the workpiece to be welded to form a short-circuit current in the current loop, the arc is extinguished, the constant voltage characteristic power supply monitors the short-circuit current in the current loop, and the current signal is characterized by t in figure 56-t7The arc control center controls the output current of the constant voltage characteristic power supply by adjustingThe current increase speed is controlled to prevent the molten drop from exploding and breaking rapidly, meanwhile, the driving force for separating the molten drop is increased by reducing the welding wire feeding speed of the wire feeding mechanism, so that the liquid molten drop at the tip of the welding wire is separated from the welding wire rapidly and transited to a molten pool of a workpiece to be welded to complete one molten drop transition, and the current signal characteristic is t in figure 57-t8A segment;
s5, separating the welding wire from the surface of the workpiece to be welded after the molten drop is transited, igniting the electric arc, and circulating the steps S2-S4.
The set wire feeding speed and the set minimum current value are obtained through pre-experiments, welding materials, sizes, welding requirements and the like are different, and the set wire feeding speed and the minimum current value are also different.
In this example, the outer shell of the ring electrode 1 is an insulated cylindrical shell, the outer diameter of the cylindrical shell is 10-20 mm, the wall thickness of the cylindrical shell is 1.2-2.5 mm, and the diameter of the conductive wire feeding wheel 2 is 4.5-9.5 mm.
In this example, when the constant voltage characteristic power source 6 detects that the current in the electric circuit is reduced to a set minimum current value, the distance between the tip of the welding wire and the surface of the workpiece 8 to be welded is 0.5 to 2 mm.
The output current of the constant voltage characteristic power supply 6 in this example is in the range of 0 to 100A.
In the welding process of the embodiment, the distance between the action point of the laser beam and the tip of the welding wire is-3 mm to +3 mm.
Claims (5)
1. A welding method of a laser-low current welding wire spontaneous induction arc hybrid welding system, the hybrid welding system comprises a laser head for generating laser beams, a wire feeding mechanism capable of adjusting the feeding speed of the welding wire in real time, the welding wire and a shielding gas device, and is characterized in that: the wire feeding mechanism comprises a ring electrode suitable for narrow gaps, a conductive wire feeding wheel used for restricting the position of a welding wire, assisting in wire feeding and realizing the electric connection of the ring electrode and the welding wire, a wire feeding nozzle for restricting the feeding position of the welding wire and a wire feeder connected with the ring electrode; the composite welding system also comprises a constant voltage characteristic power supply and an arc control center, wherein the anode of the constant voltage characteristic power supply is electrically connected with the annular electrode of the wire feeding mechanism, and the cathode of the constant voltage characteristic power supply is electrically connected with a workpiece to be welded;
in the welding process, a constant-voltage characteristic power supply outputs a small current, a wire feeding mechanism feeds a welding wire, the welding wire spontaneously induces an electric arc on the surface of a workpiece to be welded and is combined with a laser beam generated by a laser head to weld; constant voltage characteristic power, ring electrode, electrically conductive wire feeding wheel, welding wire and wait to weld and form electric loop between the work piece, electric arc control center passes through the electric current size of constant voltage characteristic power real-time supervision welding in-process electric loop to welding wire feeding action and the output current of constant voltage characteristic power of wire feeding mechanism are adjusted according to the electric current size and are stabilized in order to maintain electric arc, and concrete step includes:
s1, starting welding, loading constant voltage on a constant voltage characteristic power supply, feeding a welding wire by a wire feeding mechanism at a set welding wire feeding speed, forming short-circuit current in a current loop when the welding wire contacts the surface of a workpiece to be welded, and forming liquid molten drops at the tip of the welding wire under the action of resistance heat and laser beam heat; the arc control center controls the current increase speed by adjusting the output current of the constant-voltage characteristic power supply to prevent molten drops from being exploded rapidly, and simultaneously increases the driving force for molten drop separation by reducing the welding wire feeding speed of the wire feeding mechanism to ensure that liquid molten drops at the tip of a welding wire are separated from the welding wire rapidly and are transited to a molten pool of a workpiece to be welded to complete first molten drop transition; separating the welding wire from the surface of the workpiece to be welded after the molten drop is transited and igniting the electric arc;
s2, forming liquid molten drops by the tip of the welding wire under the action of arc heat and laser beam heat, increasing the distance between the tip of the welding wire and a workpiece to be welded along with the reduction of the feeding speed of the welding wire, lengthening the arc, and rapidly reducing the current in the circuit monitored by the constant-voltage characteristic power supply;
s3, when the current in the electric loop is reduced to the set minimum current value, the wire feeding speed is recovered to the set wire feeding speed;
s4, enabling the liquid molten drop at the tip of the welding wire to contact the surface of a workpiece to be welded, forming short-circuit current in a current loop, extinguishing an electric arc, monitoring the short-circuit current in the current loop by a constant-voltage characteristic power supply, controlling the current increasing speed by an electric arc control center by adjusting the output current of the constant-voltage characteristic power supply, preventing the molten drop from being exploded rapidly, and increasing the driving force for separating the molten drop by reducing the feeding speed of the welding wire of a wire feeding mechanism to enable the liquid molten drop at the tip of the welding wire to be separated from the welding wire rapidly and to be transferred into a molten pool of the workpiece to be welded so as to complete one;
s5, separating the welding wire from the surface of the workpiece to be welded after the molten drop is transited, igniting the electric arc, and circulating the steps S2-S4.
2. The welding method of the laser-low current welding wire spontaneous induction arc hybrid welding system according to claim 1, wherein the welding method comprises the following steps: the annular electrode shell is an insulating cylindrical shell, the outer diameter of the cylindrical shell is 10-20 mm, the wall thickness of the cylindrical shell is 1.2-2.5 mm, and the diameter of the conductive wire feeding wheel is 4.5-9.5 mm.
3. The welding method of the laser-low current welding wire spontaneous induction arc hybrid welding system according to claim 1, wherein the welding method comprises the following steps: when the constant voltage characteristic power supply monitors that the current in the electric loop is reduced to a set minimum current value, the distance between the tip of the welding wire and the surface of the workpiece to be welded is 0.5-2 mm.
4. The welding method of the laser-low current welding wire spontaneous induction arc hybrid welding system according to claim 1, wherein the welding method comprises the following steps: the output current of the constant voltage characteristic power supply is in the range of 0-100A.
5. The welding method of the laser-low current welding wire spontaneous induction arc hybrid welding system according to claim 1, wherein the welding method comprises the following steps: in the welding process, the distance between the action point of the laser beam and the tip of the welding wire is-3 mm to +3 mm.
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| CN110625260A (en) | 2019-12-31 |
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