An argon arc welding machine with a protective function

Abstract

The present invention discloses a protective argon arc welding machine, including a protective cover for reducing the risk of condensed water around the cooling water pipe increasing the risk of electronic equipment; the protective cover is fixedly installed at the lower part of the inner part of the arc welding machine housing, and the protective cover is a rectangular cylindrical structure formed of flame-retardant plastic, and the rectangular cylindrical structure is used to separate the water outlet pipe, the water return pipe and the air outlet pipe in the arc welding machine housing from the electrical system in two independent spaces. In terms of structure, the present invention isolates the cooling system from the electrical system to prevent the interference of condensed water vapor on the colder pipes on the electrical system, so as to increase the service life of the electrical system; at the same time, the heat dissipation effect of the equipment is enhanced by setting a directional airflow channel.

Description

Technical Field

[0001] The present invention relates to an argon arc welding machine, and more particularly to an argon arc welding machine with a protection function. Background Art

[0002] Argon arc welding machines are widely used in the industrial field, especially for stainless steel welding; an argon arc welding machine includes a machine body and a welding handle, which are generally separated. The argon arc welding machine outputs current to the non-melting electrode made of active tungsten, and then adopts a high-voltage breakdown arc starting method. During use, an inert gas is provided at the tungsten electrode position to protect the arc welding, and the inert gas is argon.

[0003] At present, argon arc welding mainly includes equipment for fixed-point use and equipment for mobile outdoor use. Among them, the equipment for fixed-point use can be connected to cooling water for cooling, so that it can work continuously; while the equipment for outdoor use is generally not equipped with a cooling device for easy movement, so it cannot work continuously; at the same time, since both the gas and the cooling water are integrated inside the argon arc welding machine, it is easy to condense water vapor on the surface of the pipeline relative to the high temperature inside. These water vapors are very likely to be evaporated and rise to the electrical part again, posing a great hidden danger and most likely causing component aging. Summary of the Invention

[0004] The purpose of the present invention is to provide an argon arc welding machine with a protection function to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An argon arc welding machine with a protection function includes a protective cover that reduces the risk of condensate around the cooling water pipe increasing the risk of electronic equipment; the protective cover is fixedly installed below the inner part of the arc welding machine housing. The protective cover is a rectangular cylindrical structure formed by flame-retardant plastic, and the rectangular cylindrical structure is used to separate the water outlet pipe, water return pipe and gas outlet pipe in the arc welding machine housing from the electrical system in two independent spaces.

[0007] As a further solution of the present invention: The protective cover is also provided with a gas guiding and heat dissipating structure. The gas guiding and heat dissipating structure includes an exhaust port opened at the upper part of the rear end thereof, and a wide-mouth air inlet cover is integrally formed on one side of the exhaust port away from the rear end. The air inlet cover opens towards the rear of the arc welding machine housing, and a screw connection seat is integrally formed on the inner wall of the air inlet cover. The exhaust fan is fixedly connected to the air inlet cover by screws, and the output end of the exhaust fan faces outward; air inlets are opened on both sides of the front end of the protective cover, and the air inlets correspond to the air inlet grilles opened on the side plates of both sides of the arc welding machine housing.

[0008] As a further solution of the present invention: One ends of the water outlet pipe, the water return pipe and the air outlet pipe inside the protective cover facing the front panel of the arc welder housing are respectively connected to a front water outlet quick connector, a front water return quick connector and a front air outlet quick connector, and one ends of the water outlet pipe, the water return pipe and the air outlet pipe facing the rear panel of the arc welder housing are respectively connected to a rear water outlet connecting copper pipe, a rear water return connecting copper pipe and a rear air outlet connecting copper pipe.

[0009] As a further solution of the present invention: A micro water pump is also fixedly connected to the protective cover. The input end of the micro water pump is connected to the first port of a tee through a hose, and the output end of the micro water pump is connected to the first port of another tee through another hose. The second port of the tee at the output end of the micro water pump is connected to the front water outlet quick connector through a pipe, and the second port of the tee at the input end of the micro water pump is connected to the rear water outlet connecting copper pipe through a pipe. The third port of the tee at the output end of the micro water pump is connected to the third port of the tee at the input end of the micro water pump through a one-way valve, and the one-way valve conducts unidirectionally to supply water from the rear water outlet connecting copper pipe to the front water outlet quick connector.

[0010] As a further solution of the present invention: A cross beam is welded at the position of the inner frame of the arc welder housing at the rear end. The cross beam is used to hang the water tank. A hook with a downward opening is vertically connected to one side of the water tank facing the back of the arc welder housing. An inlet hole and an outlet hole are respectively opened at the top and bottom of one side of the water tank, and connecting copper pipes are welded on the inlet hole and the outlet hole to facilitate connecting the water outlet pipe and the water return pipe through rubber hoses.

[0011] As a further solution of the present invention: A reinforcing aluminum plate is welded to the bottom of the water tank. The positions of the reinforcing aluminum plate near the four corners are respectively connected to the radiator through a pre-tightening mechanism. A semi-conductive refrigeration mechanism that can be plugged in is installed between the radiator and the reinforcing aluminum plate. The water in the water tank is cooled through the semi-conductive refrigeration mechanism to prevent the water temperature from rising too high due to temperature accumulation. The pre-tightening mechanism is composed of a stud, a spring and a nut. The stud is threadedly connected to a threaded hole opened on the reinforcing aluminum plate. Through holes correspondingly opened at the four corners of the radiator pass through the corresponding studs. A nut is connected to the lower end of the stud, and a spring is arranged between the nut and the radiator. The distance is adjusted through the nut and the reset force of the spring presses the semi-conductive refrigeration mechanism. The radiator hangs down to the position of the exhaust fan, and the exhaust fan is inclined 30 - 45° upward to the back of the arc welder housing.

[0012] As a further solution of the present invention: The semiconductor refrigeration mechanism is composed of a semiconductor refrigeration sheet clamp and a semiconductor refrigeration sheet. The semiconductor refrigeration sheet clamp is formed by bending a U-shaped stainless steel sheet. The width of the clamping area of the semiconductor refrigeration sheet clamp is equal to the width of the semiconductor refrigeration sheet. The thickness of the semiconductor refrigeration sheet clamp is less than the thickness of the semiconductor refrigeration sheet. The two ends of the U-shaped semiconductor refrigeration sheet clamp form a necking relative to the inner groove. When the semiconductor refrigeration sheet is inserted into the semiconductor refrigeration sheet clamp, the necking position can play a limiting role to prevent the semiconductor refrigeration sheet from slipping out and moving randomly; A support plate is connected between one side behind the necking of the semiconductor refrigeration sheet clamp; A wire inlet and outlet groove is provided in the middle of the semiconductor refrigeration sheet clamp to facilitate the power supply wire of the semiconductor refrigeration sheet clamp to pass through. The edge of the middle part of the semiconductor refrigeration sheet clamp extends downward to form a connecting ear. A through hole is provided on the connecting ear and is connected to a threaded hole provided on the side of the radiator through a screw.

[0013] As a further solution of the present invention: A USB power supply terminal is installed on the back plate of the arc welding machine housing. The USB power supply terminal is connected to the power supply interface through a transformer to be connected in parallel with the arc welding machine's electrical control system at the power supply position. The power supply sections of the semiconductor refrigeration sheet and the micro water pump are both welded with USB plugs.

[0014] As a further solution of the present invention: It further includes a current controller. The current controller formulates the period, frequency, duty cycle, and accuracy of the waveform by an embedded development single-chip microcomputer, so that the current alternately realizes the specified waveform. The current controller is installed between the working current output terminal in the arc welding machine's electrical control system and the power supply plug installed on the arc welding machine housing. The method for the current controller to control the current is as follows:

[0015] 1) Within one cycle, the negative half cycle of the current is about 5% - 25% larger than the positive half cycle;

[0016] 2) Set a switching point for the switching of the positive and negative half cycles of the current;

[0017] 3) Set a convex point in the negative half cycle of the current. The time of the convex point is 10% - 25% of the negative half cycle time, and the magnitude of the current is 5 - 25% of the negative half cycle current.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] In terms of structure, the present invention isolates the cooling system and the electrical system to prevent interference to the electrical system caused by condensed water vapor on the relatively cold pipes, and improves the service life of the electrical system; At the same time, by setting a directional air flow channel, the heat dissipation effect of the equipment is enhanced.

[0020] The present invention also realizes the long-term outdoor use of the argon arc welding equipment by setting an external water tank, reduces the rest time required due to overheating, and improves work efficiency.

[0021] The present invention enhances the cleaning effect by setting a current controller to control the current output, that is:

[0022] (1) The purpose of making the negative half-cycle of the current 5% - 25% larger than the positive half-cycle is to enhance the cleaning effect, make the weld seam smoother, and reduce the generation of bubbles;

[0023] (2) The purpose of setting a switching point for the positive and negative half-cycles of the current is to reduce the loss of IGBT switching, thereby protecting the IGBT; more effectively prevent arc interruption caused by AC-DC switching;

[0024] (2) The purpose of setting a bump in the negative half-cycle of the current is to further enhance the cleaning effect on the basis of (1); the short bump current time enhances the cleaning effect without causing excessive loss to the tungsten rod of the argon arc welding gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the position of the protective cover in an argon arc welding machine with a protective function.

[0026] Figure 2 It is Figure 1 a schematic structural diagram of the front cross-section.

[0027] Figure 3 It is Figure 1 a left view.

[0028] Figure 4 It is Figure 3 an enlarged schematic structural diagram of part A in

[0029] Figure 5 a schematic structural diagram of a semiconductor refrigeration mechanism.

[0030] Figure 6 a current square wave diagram output by an existing argon arc welding machine.

[0031] Figure 7 a current square wave diagram controlled by a current controller for output.

[0032] Figure 8 It is Figure 7 a segmentation schematic diagram of the square wave diagram in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] Please refer to Figures 1 to 5 , in the embodiment of the present invention, a TIG welder with a protective function includes a protective cover 3 that reduces the risk of electronic equipment caused by increased condensate around the cooling water pipe.

[0036] The protective cover 3 is a rectangular cylindrical structure formed by flame-retardant plastic. The protective cover 3 is located below the inner part of the arc welder housing 1. Both ends of the protective cover 3 are connected to the inner side surfaces of the front and rear panels of the arc welder housing 1 by screws. An outlet pipe 6, a return pipe, and an outlet gas pipe are arranged inside the protective cover 3. One ends of the outlet pipe 6, the return pipe, and the outlet gas pipe facing the front panel of the arc welder housing 1 are respectively connected to a front outlet quick connector 5, a front return quick connector, and a front outlet gas quick connector 6. One ends of the outlet pipe 6, the return pipe, and the outlet gas pipe facing the rear panel of the arc welder housing 1 are respectively connected to a rear outlet connecting copper pipe 10, a rear return connecting copper pipe, and a rear outlet gas connecting copper pipe. An exhaust port is opened above the rear end of the protective cover 3, and a wide-mouth air inlet cover 9 (bent at both sides of a plate) is integrally formed and connected to one side of the exhaust port far from the rear end. The opening of the air inlet cover 9 faces the rear of the arc welder housing 1. A screw connection seat is integrally formed on the inner wall of the air inlet cover 9. An exhaust fan 11 is fixedly connected to the air inlet cover 9 by screws, and the output end of the exhaust fan 11 faces outward; the exhaust fan 11 is inclined at 30-45° upward to the back of the arc welder housing 1. The purpose of the inclined design is to accelerate heat dissipation upward, and at the same time, it can also assist in the heat dissipation of the water tank after loss; air inlets 4 are opened on both sides of the front end of the protective cover 3. The air inlets 4 correspond to the air intake grilles opened on the side plates of both sides of the arc welder housing 1. Through the air flow inside the air inlet cover 9, it can prevent the condensed water vapor generated on the surfaces of the cooling water pipe and the air pipe from evaporating again due to temperature reduction and rising to the upper circuit board, and at the same time, it can quickly discharge moisture. In addition, secondly, the rapid flow of air inside the air inlet cover 9 keeps the surface temperature of the air inlet cover 9 at a level lower than the surrounding environment all the time, thereby realizing the auxiliary heat dissipation of the arc welder. In the above situation, especially in summer, it can better protect the TIG welder and extend its service life.

[0037] A power supply plug is also fixedly installed on the front panel of the arc welder housing 1. A groove is recessed at the end of the air inlet cover 9 corresponding to the part of the power supply plug located inside the arc welder housing 1, which is convenient for the access of wires.

[0038] The above-mentioned rear outlet connecting copper pipe 10, rear return connecting copper pipe, and rear outlet gas connecting copper pipe can be made of copper and are copper pipes with an outer diameter larger than the inner diameter of the corresponding pipe, and the ends of the copper pipes are closed with a diameter smaller than the inner diameter of the corresponding pipe, so as to be inserted into the pipe for connection. Because the entire arc welder moves less during actual use, this simple connection method can be adopted; while the interfaces on the front panel are used to connect the handle that needs to be frequently moved, so relatively stable and quick-connect quick connectors need to be adopted to reduce costs and meet the requirements. Of course, the copper pipes at the rear can also be replaced with quick connectors.

[0039] The front water outlet quick connector 5, the front water return quick connector, the front air outlet quick connector 6, the rear water outlet connecting copper pipe 10, the rear water return connecting copper pipe and the rear air outlet connecting copper pipe are all fixedly connected to both ends of the protective cover 3, and through holes for the above-mentioned connectors and copper pipes to pass through are correspondingly opened on the front and rear panels of the arc welding machine housing 1.

[0040] A micro water pump 2 is also fixedly connected to the protective cover 3. The input end of the micro water pump 2 is connected to the first port of a tee through a hose, the output end of the micro water pump 2 is connected to the first port of another tee through another hose, the second port of the tee at the output end of the micro water pump 2 is connected to the front water outlet quick connector 5 through a pipe, the second port of the tee at the input end of the micro water pump 2 is connected to the rear water outlet connecting copper pipe 10 through a pipe, and the third port of the tee at the output end of the micro water pump 2 is connected to the third port of the tee at the input end of the micro water pump 2 through a one-way valve 7. The one-way valve 7 unidirectionally conducts the supply of the rear water outlet connecting copper pipe 10 to the front water outlet quick connector 5; the above structure enables the micro water pump 2 to participate in the cooling water circulation, accelerates the heat dissipation at the handle position, and is used for long-term operation; in addition, the micro water pump 2 can also be used in cooperation with an outdoor-mounted water tank.

[0041] A cross beam 14 is welded at the position of the inner frame of the arc welding machine housing 1 at the rear end. The cross beam 14 is used to hang the water tank 12. A hook 13 with a downward opening is vertically connected to one side of the water tank 12 facing the back of the arc welding machine housing 1. When actually designing the housing, a vertical sliding groove for the hook 13 to insert is correspondingly opened on the back panel of the arc welding machine housing 1. An opening is made at the top of the water tank 12 and a pipe with an external thread is welded. The upper end of the pipe is threadedly connected with a lid for convenient water addition; an inlet hole and an outlet hole are respectively opened at the top and bottom of one side of the water tank 12. The inlet hole is connected to one end of an extension pipe. The extension pipe is bent downward along the surface of the water tank 12 and the other end is flush with the outlet hole. Connecting copper pipes are welded to the other end of the extension pipe and the outlet hole respectively, so as to be connected to the rear water outlet connecting copper pipe 10 and the rear water return connecting copper pipe through a rubber hose, realizing the cooling of the handle during outdoor work, improving the usage time of outdoor equipment and improving work efficiency.

[0042] A reinforcing aluminum plate 18 is welded to the bottom of the water tank 12. The positions of the reinforcing aluminum plate 18 near the four corners are all connected to the radiator 17 through a pre-tightening mechanism. A semi-conductive refrigeration mechanism 24 that can be plugged and unplugged is installed between the radiator 17 and the reinforcing aluminum plate 18. The water in the water tank 12 is cooled through the semi-conductive refrigeration mechanism to avoid excessive increase in water temperature caused by temperature accumulation. The pre-tightening mechanism consists of a stud 19, a spring 20 and a nut 21. The stud 19 is threadedly connected to a threaded hole opened on the reinforcing aluminum plate 18. Through holes corresponding to the four corners of the radiator 17 pass through the corresponding studs 19. A nut 21 is connected to the lower end of the stud. A spring 20 is arranged between the nut 21 and the radiator 17. The semi-conductive refrigeration mechanism 24 is pressed through adjusting the distance by the nut and the restoring force of the spring.

[0043] The semi-conductive refrigeration mechanism 24 consists of a semi-conductive refrigeration sheet clamp 28 and a semi-conductive refrigeration sheet. The semi-conductive refrigeration sheet clamp 28 is formed by bending a U-shaped stainless steel sheet. The width of the clamping area of the semi-conductive refrigeration sheet clamp 28 is equal to the width of the semi-conductive refrigeration sheet. The thickness of the semi-conductive refrigeration sheet clamp 28 is less than the thickness of the semi-conductive refrigeration sheet. Narrow openings 29 are formed in the inner grooves at the opposite ends of the U-shaped semi-conductive refrigeration sheet clamp 28. When the semi-conductive refrigeration sheet is inserted into the semi-conductive refrigeration sheet clamp 28, the narrow openings 29 can play a limiting role to prevent the semi-conductive refrigeration sheet from sliding out and moving randomly. A support plate 27 is connected between one side behind the narrow openings of the semi-conductive refrigeration sheet clamp 28. A wire inlet and outlet groove 26 is opened in the middle of the semi-conductive refrigeration sheet clamp 28 to facilitate the passage of the power supply wire of the semi-conductive refrigeration sheet clamp 28. Connection ears 25 are formed by downward extension of the edges in the middle of the semi-conductive refrigeration sheet clamp 28. Through holes are opened on the connection ears 25 and are connected to threaded holes opened on the side surface of the radiator 17 through screws for easy replacement. In actual use, the semi-conductive refrigeration sheet 28 is located at the lower refrigeration position to ensure the lowest temperature of the output cold water.

[0044] A USB power supply terminal is installed on the back plate of the arc welding machine housing 1. The USB power supply terminal is connected to the power supply interface through a transformer (the output is 3V), so as to be connected in parallel with the arc welding machine electronic control system at the power supply position. The power supply sections of the semi-conductive refrigeration sheet 28 and the micro water pump 2 are both welded with USB plugs to facilitate power supply.

[0045] Embodiment 2

[0046] Refer to Figure 2 , the present invention further includes a current controller. The current controller formulates the period, frequency, duty cycle and accuracy of the waveform by an embedded development single-chip microcomputer, so that the current alternately realizes the specified waveform. The current controller is installed between the working current output terminal in the arc welding machine electronic control system and the power supply plug installed on the arc welding machine housing 1. The method for the current controller to control the current is as follows:

[0047] 1) During one period, the negative half-cycle of the current is about 5% - 25% larger than the positive half-cycle;

[0048] 2) Set the switching point for the positive and negative half-cycles of the current;

[0049] 3) Set convex points during the negative half-cycle of the current. The time of the convex points is 10% - 25% of the negative half-cycle time, and the current magnitude is 5 - 25% of the negative half-cycle current.

[0050] Refer to Figure 3 , set 0 - 7 segmentation points for the waveform diagram within one period, and divide the waveform diagram into 7 segments, namely 0 - 1, 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6, 6 - 7;

[0051] By giving corresponding given values to these seven segments respectively, the new waveform diagram can be realized.

[0052] T = 1 / f, negative half-cycle time = duty cycle * T, positive half-cycle time = T - negative half-cycle time.

[0053] The time of the switching point (0 - 1) is determined by the falling time from the maximum current to the switching point current.

[0054] The precision is the minimum time interval of the given value, and at the same time, the precision also determines the minimum period.

[0055] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0056] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An argon arc welding machine with a protective function, characterized in that, it includes a protective cover (3) that reduces the risk of condensate around the cooling water pipe increasing the risk of electronic equipment; the protective cover (3) is fixedly installed below the interior of the arc welding machine housing (1), and the protective cover (3) is a rectangular cylindrical structure formed by flame-retardant plastic. The rectangular cylindrical structure is used to separate the water outlet pipe, water return pipe and air outlet pipe in the arc welding machine housing from the electrical system in two independent spaces; a cross beam (14) is welded at the position of the inner frame of the arc welding machine housing (1) at the rear end. The cross beam (14) is used to hang the water tank (12). A reinforcing aluminum plate (18) is welded at the bottom of the water tank (12). The positions near the four corners of the reinforcing aluminum plate (18) are all connected to the radiator (17) through a pre-tightening mechanism. A semiconductor refrigeration mechanism (24) that can be plugged in is installed on the radiator (17) and the reinforcing aluminum plate (18). The water in the water tank (12) is cooled through the semiconductor refrigeration mechanism; a pipe with an external thread is welded to the top of the water tank (12) after opening a hole, and the upper end of the pipe is threadedly connected to a lid; the pre-tightening mechanism is composed of a stud (19), a spring (20) and a nut (21). The stud (19) is threadedly connected to a threaded hole opened on the reinforcing aluminum plate (18). Through holes corresponding to the four corners of the radiator (17) pass through the corresponding studs (19). A nut (21) is connected to the lower end of the stud. A spring (20) is arranged between the nut (21) and the radiator (17). The distance is adjusted by the nut and the restoring force of the spring presses the semiconductor refrigeration mechanism (24); the semiconductor refrigeration mechanism (24) is composed of a semiconductor refrigeration sheet clip (28) and a semiconductor refrigeration sheet. The semiconductor refrigeration sheet clip (28) is formed by bending a U-shaped stainless steel sheet. The width of the clamping area of the semiconductor refrigeration sheet clip (28) is equal to the width of the semiconductor refrigeration sheet. The thickness of the semiconductor refrigeration sheet clip (28) is less than the thickness of the semiconductor refrigeration sheet. Narrow openings (29) are formed in the inner grooves at opposite ends of the U-shaped semiconductor refrigeration sheet clip (28). When the semiconductor refrigeration sheet is inserted into the semiconductor refrigeration sheet clip (28), the narrow openings (29) can play a limiting role; a support plate (27) is connected between one side behind the narrow opening of the semiconductor refrigeration sheet clip (28). An ear (25) is formed by downward extension of the edge in the middle of the semiconductor refrigeration sheet clip (28). A through hole is opened on the ear (25) and it is connected to a threaded hole opened on the side of the radiator (17) through a screw.

2. The argon arc welding machine with a protective function according to claim 1, characterized in that, The protective cover (3) is also provided with an air guiding and heat dissipating structure. The air guiding and heat dissipating structure includes an exhaust port opened above the rear end of the protective cover (3), and a wide-mouth intake hood (9) is integrally formed and connected to one side of the exhaust port away from the rear end. The opening of the intake hood (9) faces the rear of the arc welder housing (1). A screw connection seat is integrally formed on the inner wall of the intake hood (9). The exhaust fan (11) is fixedly connected to the intake hood (9) by screws, and the output end of the exhaust fan (11) faces outward. Air inlet openings (4) are provided on both sides of the front end of the protective cover (3), and the air inlet openings (4) correspond to the air intake grilles provided on the side plates on both sides of the arc welder housing (1).

3. The argon arc welder with a protective function according to claim 2, characterized in that, One ends of the water outlet pipe, the water return pipe and the air outlet pipe in the protective cover (3) facing the front panel of the arc welder housing (1) are respectively connected to a front water outlet quick interface (5), a front water return quick interface and a front air outlet quick interface. One ends of the water outlet pipe, the water return pipe and the air outlet pipe facing the rear panel of the arc welder housing (1) are respectively connected to a rear water outlet connecting copper pipe (10), a rear water return connecting copper pipe and a rear air outlet connecting copper pipe.

4. The argon arc welder with a protective function according to claim 3, characterized in that, A micro water pump (2) is also fixedly connected to the protective cover (3). The input end of the micro water pump (2) is connected to the first port of a tee through a hose, and the output end of the micro water pump (2) is connected to the first port of another tee through another hose. The second port of the tee at the output end of the micro water pump (2) is connected to the front water outlet quick interface (5) through a pipe, and the second port of the tee at the input end of the micro water pump (2) is connected to the rear water outlet connecting copper pipe (10) through a pipe. The third port of the tee at the output end of the micro water pump (2) is connected to the third port of the tee at the input end of the micro water pump (2) through a one-way valve (7), and the one-way valve (7) unidirectionally conducts to supply water from the rear water outlet connecting copper pipe (10) to the front water outlet quick interface (5).

5. The argon arc welder with a protective function according to claim 4, characterized in that, A hook (13) with an opening facing downwards is vertically connected to one side of the water tank (12) facing the back of the arc welder housing (1). Water inlet holes and water outlet holes are respectively provided at the top and bottom of one side of the water tank (12), and connecting copper pipes are welded on the water inlet holes and the water outlet holes to facilitate connecting the water outlet pipe and the water return pipe through rubber hoses.

6. The argon arc welder with a protective function according to claim 5, characterized in that, The radiator (17) hangs down to the position of the exhaust fan (11), and the exhaust fan (11) is inclined 30 - 45° upward towards the back of the arc welder housing (1).

7. The argon arc welder with a protective function according to claim 6, characterized in that, A wire inlet and outlet wire groove (26) is provided in the middle of the semiconductor refrigeration sheet clamp (28) to facilitate the power supply wire of the semiconductor refrigeration sheet clamp (28) to pass through.

8. The argon arc welder with a protective function according to claim 7, characterized in that, A USB power supply terminal is installed on the back plate of the housing (1) of the arc welding machine. The USB power supply terminal is connected to the power interface through a transformer so as to be connected in parallel with the arc welding machine's electric control system at the power supply position, and the power supply ends of the semiconductor refrigeration sheet and the micro water pump (2) are both welded with USB plugs.

9. The argon arc welding machine with a protection function according to any one of claims 1-8, characterized in that it further includes a current controller. The current controller formulates the period, frequency, duty cycle and accuracy of the waveform by an embedded development single-chip microcomputer, so that the current alternately realizes the specified waveform. The current controller is installed between the working current output terminal in the arc welding machine's electric control system and the power supply plug installed on the housing of the arc welding machine.

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