Repair system and method of auxiliary heating process for improving electric arc repair welding repair performance of ZM6 magnesium alloy

Abstract

The invention discloses an auxiliary heating process for improving the electric arc repair welding repair performance of a ZM6 magnesium alloy, and the reasonable auxiliary heating process is applied in the TIG repair process of the ZM6 magnesium alloy, so that the mechanical property of a repaired workpiece can be greatly improved. The specific auxiliary heating process comprises the following steps that the magnesium alloy casting is placed on a heating platform, the heating temperature is set to be 180-250 DEG C, the heating rate is 5-10 DEG C / min, the temperature fluctuation of the position to be repaired is within 5 DEG C, repairing is started, continuous heating is conducted in the repairing process, the liquidity of a molten pool is improved, the welding residual stress is reduced, and the possibility of welding defect generation is reduced; and the repaired workpiece is naturally cooled in the air. The tensile strength of the repaired workpiece reaches 193 MPa, the tensile strength of a joint repaired through traditional TIG welding is generally about 150 MPa, and the tensile strength of the joint repaired through the auxiliary heating process is improved by 28.67% and is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of magnesium alloy welding, and in particular relates to a repair system and a method of an auxiliary heat process for improving the arc repair welding repair performance of a ZM6 magnesium alloy. Background Art

[0002] Magnesium alloy is the lightest metal structural material currently used in engineering applications. It has a series of advantages such as low density, high specific strength and specific stiffness, easy casting and forging, good electromagnetic shielding performance, and strong recyclability. It is known as the "green engineering material of the 21st century" and is widely used in aerospace, automotive industry, electronic equipment and other fields.

[0003] Since magnesium alloy components will inevitably have defects during casting and processing, if they cannot be repaired with high quality, huge scrap losses will be caused; at the same time, abnormal damage to components will occur under special service conditions, and the time required for repair and replacement is long, which cannot meet emergency needs. Therefore, in the manufacturing and use of magnesium alloy components, efficient and high-quality repair of them is a key issue that needs to be solved urgently.

[0004] Due to the good thermal conductivity of magnesium alloy, during the repair process, if there is no auxiliary heating process, the instantaneous high temperature generated by the arc will cause the local temperature of the plate to rise sharply, while the temperature of the surrounding area is relatively low, thus forming a large temperature gradient. This temperature difference will cause thermal stress inside the plate. When the thermal stress exceeds the yield strength of the magnesium alloy, it will cause the plate to deform or even crack. In addition, the melting point of magnesium alloy is relatively low, and the liquid metal in the molten pool is easy to solidify quickly. If the fluidity of the molten pool is poor, it will lead to unsightly weld formation and defects such as pores and slag inclusions. Summary of the invention

[0005] In view of this, in order to solve the problem that the existing magnesium alloy components cannot be repaired with high quality during casting and processing, resulting in huge waste losses; at the same time, abnormal damage to the components will occur under special service conditions, and the time for rework and replacement is long, which cannot meet the emergency needs. The present invention proposes a repair system and method for an auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy, which adds an auxiliary heat process to the existing magnesium alloy component arc repair process, thereby improving the repair performance of magnesium alloy components.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a repair system of auxiliary heat process for improving the arc repair performance of ZM6 magnesium alloy, comprising a TIG power supply, a wire feeding mechanism, a welding robot, a welding gun, a wire feeding nozzle, a repair platform and a heating table, wherein a wire feeding mechanism is installed on the upper side of the TIG power supply, a repair platform is arranged on one side of the TIG power supply, and the repair platform is connected to the negative pole of the TIG power supply through a No. 1 cable; the welding gun is arranged above the repair platform and is connected to the positive pole of the TIG power supply through a No. 2 cable, a wire feeding nozzle is arranged on one side of the welding gun, and the wire feeding nozzle is connected to the wire feeding mechanism through a wire feeding hose, and the welding gun is fixed on the welding robot; the heating table is located above the repair platform and below the repair plate, and the heating table is connected to the temperature controller through a wire.

[0007] Furthermore, the tungsten pole of the welding gun is pure tungsten, and the diameter of the tungsten pole is 3.2 mm.

[0008] Furthermore, the diameter of the ceramic nozzle in the welding gun is 12 mm.

[0009] Furthermore, the diameter of the magnesium alloy welding wire suitable for the wire feeding mechanism is 1.2 mm.

[0010] Furthermore, along the moving direction of the welding gun, the wire feeding nozzle is located at the front side of the welding gun.

[0011] A repair method for a repair system of an auxiliary heat process for improving the arc repair welding repair performance of ZM6 magnesium alloy specifically comprises the following steps:

[0012] Step 1: Turn on the repair system: turn on the TIG power supply, welding robot and welding shielding gas;

[0013] Step 2: Place the magnesium alloy welding wire: Place the magnesium alloy welding wire on the wire feeding mechanism so that the welding wire extends from the end of the wire feeding nozzle with a length of 10 mm; adjust the angle of the wire feeding nozzle so that the end of the welding wire is located below the tungsten electrode of the welding gun;

[0014] Step 3: Grinding and cleaning the surface of the magnesium alloy groove: The groove of the magnesium alloy plate is a V-shaped groove with a groove size of width: 20mm and depth: 5mm. Use an angle grinder to mechanically grind the magnesium alloy plate and the groove. After grinding, use alcohol to clean the magnesium alloy surface to ensure the surface is clean;

[0015] Step 4: Repair path programming and parameter setting: Fix the magnesium alloy plate on the upper surface of the heating table, use the teaching pendant of the welding robot to program the repair path, and set the moving speed of the welding gun to no more than 6mm / s; set the welding current from the TIG power supply, the welding current range is 160-180A, the distance between the tungsten tip of the welding gun and the tip of the magnesium alloy V-shaped groove is 2-3mm, the wire feeding speed is set to 2m / min, and the wire feeding program is executed after a delay of 3s after the TIG arc is started. At the end of each repair arc, the TIG arc is closed using the current slow-down program, and the wire feeding program is stopped at the same time;

[0016] Step 5: Preheating temperature selection: Set the preheating temperature based on the thermophysical properties of ZM6 magnesium alloy and the thickness of the sheet;

[0017] Step 6: Heating strategy: Turn on the power of the heating table, set the initial preheating temperature to 80℃, start heating at a slow heating rate of 3℃ / min, so that the heating table and the magnesium alloy plate are heated synchronously to allow the plate to initially adapt to the temperature change. When the temperature reaches 80℃, maintain the temperature for 10 minutes, use a handheld thermocouple to measure the temperature of the repaired part of the magnesium alloy plate to ensure that the temperature uniformity is within the range of ±5℃, and then increase the temperature to 150℃ at a heating rate of 10℃ / min. After reaching 150℃, maintain it for 10-15 minutes again for the second temperature balance, repeat the above temperature measurement and adjustment operations to ensure that the overall temperature of the plate is uniform, and finally increase the temperature to 200℃ at a heating rate of 5℃ / min;

[0018] Step 7: Insulation strategy: When the surface temperature of the magnesium alloy plate is stable at 200±5℃, enter the insulation stage, immediately lock the temperature control parameters of the heating table, check the power output display of the heating table, and record the power value at this time. At this time, the heating table power is accurately controlled by the temperature controller to ensure that the plate temperature is always maintained within the range of 200℃±5℃;

[0019] Step 8: Perform repair: When the surface temperature of the test plate is stable at 200±5℃ and maintained for 5 minutes, start the arc repair and perform the repair according to the set procedure. During the repair process, the heating table continuously heats the repair process. After each repair is completed, the magnesium alloy oxide on the surface of the repair layer is quickly cleaned before the next repair.

[0020] Step 9: End of repair: Turn off the TIG power supply, welding robot, heating table and welding shielding gas. Allow the repaired magnesium alloy plate and heating table to cool naturally in the air. After cooling to room temperature, remove the repaired magnesium alloy component and clean the repair platform.

[0021] Furthermore, in step 1, the welding shielding gas uses argon gas with a purity of 99.99%, and the argon gas flow rate is set to 10-15 L / min.

[0022] Furthermore, in step 5, for plates with a thickness of less than 5 mm, the preheating temperature is set at 180-200°C; for plates with a thickness of 5-15 mm, the preheating temperature is 200-220°C; for plates with a thickness of more than 15 mm, the preheating temperature is 220-250°C.

[0023] Furthermore, in step 6, during the second temperature equalization process, local auxiliary heating measures are adopted for the low temperature areas.

[0024] Furthermore, local auxiliary heating measures are taken to place heating elements in the area for targeted heating to ensure that the overall temperature of the board rises evenly.

[0025] Compared with the prior art, the repair system and method of the auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy described in the present invention have the following beneficial effects:

[0026] 1. The auxiliary heating process for arc repair of magnesium alloys developed by the present invention is universal, and the auxiliary heating process can be applied to arc repair of magnesium alloys with different compositions. The present invention preheats the plate before repair through the auxiliary heating process, so that the overall temperature of the plate rises evenly, reduces the temperature difference between the repair area and the surrounding area, and reduces the generation of thermal stress. During the repair process, continuous auxiliary heating can maintain relative temperature stability, further avoid thermal stress concentration, and ensure the dimensional accuracy and integrity of the repaired plate. In addition, the auxiliary heating process keeps the molten pool at a relatively high temperature, enhances the fluidity of the liquid metal, and is conducive to the discharge of gas and impurities, thereby reducing the pores and slag inclusions in the weld, improving the density and uniformity of the weld, and improving the appearance quality and internal quality of the weld.

[0027] 2. The tensile properties of magnesium alloys repaired by arc repair using the method of the present invention are significantly improved. Compared with the traditional arc repair method, the tensile strength is increased by 28.67% and the elongation is increased by 76.19%.

[0028] 3. The present invention increases the fluidity of the molten pool by continuously performing auxiliary heating on the TIG repair process, reduces welding residual stress and reduces the possibility of welding defects, thereby improving the mechanical properties of the magnesium alloy repaired parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of the structure of the arc repair system for magnesium alloy according to the present invention;

[0031] Figure 2 Schematic diagram of the shape of the groove of the ZM6 magnesium alloy according to a specific embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of a specific repair path of a groove of a ZM6 magnesium alloy according to a specific embodiment of the present invention;

[0033] Figure 4 It is a comparison diagram of the tensile properties of ZM6 magnesium alloy repaired by the method of the present invention and without continuous auxiliary heat repair, wherein Figure (a) is an engineering stress-strain curve diagram, and Figure (b) is a room temperature tensile property diagram.

[0034] In the figure: TIG power supply 1, wire feeding mechanism 2, welding robot 3, welding gun 4, wire feeding nozzle 5, repair plate 6, heating table 7, repair platform 8, No. 1 cable 9, No. 2 cable 10, wire feeding hose 11, conductor 12, temperature controller 13. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0036] See also Figure 1-4 To illustrate the present embodiment, the present embodiment takes the ZM6 magnesium alloy of the Mg-Nd-Zn-Zr system as an example, a V-shaped groove with a width of 20 mm and a depth of 5 mm is opened on the substrate, and the auxiliary heat process of the present invention is used to repair it.

[0037] First, follow the attached Figure 1 An arc repair system is constructed according to the positional relationship, including a TIG power supply 1, a wire feeding mechanism 2, a welding robot 3, a welding gun 4, a wire feeding nozzle 5, a repair platform 8 and a heating table 7; a wire feeding mechanism 2 is arranged on the upper side of the TIG power supply 1, and a repair platform 8 is arranged on one side of the TIG power supply 1, and the repair platform 8 is connected to the negative electrode of the TIG power supply 1 through a No. 1 cable 9; the welding gun 4 is arranged above the repair platform 8, and is connected to the positive electrode of the TIG power supply 1 through a No. 2 cable 10, a wire feeding nozzle 5 is arranged on one side of the welding gun 4, and the wire feeding nozzle 5 is connected to the wire feeding mechanism 2 through a wire feeding hose 11, and the welding gun 4 is fixed on the welding robot 3; the heating table 7 is located above the repair platform 8 and below the repair plate 6, and the heating table 7 is connected to the temperature controller 13 through a wire.

[0038] The tungsten pole of the welding gun 4 is pure tungsten, the diameter of the tungsten pole is 3.2 mm, and the diameter of the ceramic nozzle in the welding gun is 12 mm.

[0039] The diameter of the magnesium alloy welding wire suitable for the wire feeding mechanism 2 is 1.2 mm.

[0040] During the arc repair process, along the moving direction of the welding gun 4 , the wire feeding nozzle 5 is located at the front side of the welding gun 4 .

[0041] After the arc repair system is built, repair it according to the following steps:

[0042] Step 1: Turn on the repair system: turn on the TIG power supply 1, the welding robot 3 and the welding shielding gas. The welding shielding gas uses ordinary argon gas with a purity of 99.99%, and the argon gas flow rate is set to 10-15L / min.

[0043] Step 2: Place the magnesium alloy welding wire: Place the magnesium alloy welding wire with a diameter of 1.2 mm on the wire feeding mechanism 2, so that the welding wire extends from the end of the wire feeding nozzle 5, and the extended length is about 10 mm; adjust the angle of the wire feeding nozzle 5 so that the end of the welding wire is located below the tungsten electrode of the welding gun 4 to ensure that the welding wire is continuously fed into the welding pool.

[0044] Step 3: Grinding and cleaning of magnesium alloy grooves: The dimensions of the selected magnesium alloy plates are length: 180mm, width: 100mm, thickness: 10mm, the groove is a V-shaped groove, the groove dimensions are width: 20mm, depth: 5mm, use an angle grinder to mechanically grind the magnesium alloy plate and groove, and after grinding, use alcohol to clean the surface of the magnesium alloy to ensure the surface is clean.

[0045] Step 4: Repair path programming and parameter setting: fix the magnesium alloy plate on the upper surface of the heating table 7, use the teaching pendant of the welding robot 3 to program the repair path, set the moving speed of the welding gun 4 to 4mm / s; set the welding current from the TIG power supply 1, use AC square wave, the square wave frequency is 150Hz, the AC balance is set to -4, the amplitude offset is set to 0, the welding current is 160A, the tungsten tip of the welding gun 4 is 2-3mm away from the tip of the magnesium alloy V-shaped groove, the wire feeding speed is set to 2m / min, and the wire feeding program is executed after a delay of 3s after the TIG arc is started. At the end of each repair arc, the TIG arc is extinguished using a current ramp-down program and the wire feeding program is stopped at the same time.

[0046] Step 5: Preheating temperature selection: Set the preheating temperature according to the thermophysical properties of ZM6 magnesium alloy and the thickness of the plate. For thinner plates with a thickness of less than 5mm, the preheating temperature is set at 180-200℃; for medium-thick plates with a thickness of 5-15mm, the preheating temperature is 200-220℃; for thicker plates with a thickness of more than 15mm, the preheating temperature is set at 220-250℃. The selected plate thickness is 10mm and the preheating temperature is selected as 200℃.

[0047] Step 6: Heating strategy: Turn on the power of the heating table 7, set the initial preheating temperature to 80℃, and start heating at a slow heating rate of 3℃ / min, so that the heating 7 and the magnesium alloy plate are heated synchronously, so that the plate can initially adapt to the temperature change and avoid excessive thermal stress caused by rapid heating. When the temperature reaches 80℃, maintain the temperature for 10 minutes, and use a handheld thermocouple to measure the temperature of the part to be repaired of the magnesium alloy plate to ensure that the temperature uniformity is within the range of ±5℃. If the temperature deviation is too large, the power distribution of the heating table can be adjusted appropriately; then the temperature is increased to 150℃ at a heating rate of 10℃ / min. After reaching 150℃, it is maintained for 10-15 minutes again for the second temperature balance. Repeat the above temperature measurement and adjustment operations to ensure that the overall temperature of the plate is uniform. For areas with lower temperatures, local auxiliary heating measures can be adopted, such as placing a small heating element near the area for targeted heating to ensure that the overall temperature of the plate rises uniformly; finally, the temperature is increased to 200℃ at a heating rate of 5℃ / min.

[0048] Step 7: Insulation strategy: When the surface temperature of the magnesium alloy plate is stabilized at 200±5℃, it enters the insulation stage and immediately locks the temperature control parameters of the heating stage 7 to prevent temperature changes caused by misoperation. Check the power output display of the heating stage and record the power value at this time. At this time, the power of the heating stage 7 is accurately adjusted by the temperature controller to ensure that the plate temperature is always maintained within the range of 200℃±5℃.

[0049] Step 8: Perform repair: When the surface temperature of the test plate stabilizes at 200±5℃ and maintains for 5 minutes, start the arc repair. Perform the repair according to the set procedure. During the repair process, the heating table continuously heats the repair process. After each repair, quickly clean the magnesium alloy oxide on the surface of the repair layer before proceeding to the next repair.

[0050] Step 9: End of repair: Turn off the TIG power supply 1, the welding robot 3, the heating platform 7 and the welding shielding gas. The repaired magnesium alloy plate and the heating platform 7 are cooled together in the air. After cooling to room temperature, remove the repaired magnesium alloy component and clean the repair platform.

[0051] Figure 4 The tensile strength of the repaired parts with continuous auxiliary heating is 193MPa, and the elongation is 7.51%; the tensile strength of the repaired parts without continuous auxiliary heating is 150MPa, and the elongation is 4.25%. It can be seen that the tensile strength of the repaired joints using this auxiliary heating process is increased by 28.67%, and the elongation is increased by 76.19%, which is a significant improvement.

[0052] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A repair system with auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy, characterized by: The invention comprises a TIG power source (1), a wire feeding mechanism (2), a welding robot (3), a welding gun (4), a wire feeding nozzle (5), a repair platform (8) and a heating platform (7); the wire feeding mechanism (2) is installed on the upper side of the TIG power source (1); a repair platform (8) is arranged on one side of the TIG power source (1); the repair platform (8) is connected to the negative electrode of the TIG power source (1) via a No. 1 cable (9); the welding gun (4) is arranged above the repair platform (8) and is connected to the positive electrode of the TIG power source (1) via a No. 2 cable (10); a wire feeding nozzle (5) is arranged on one side of the welding gun (4); the wire feeding nozzle (5) is connected to the wire feeding mechanism (2) via a wire feeding hose (11); the welding gun (4) is fixed on the welding robot (3); the heating platform (7) is located above the repair platform (8) and below the repair plate (6); a temperature controller (13) is connected to the heating platform (7) via a wire (12).

2. The repair system of the auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy according to claim 1 is characterized in that: The tungsten pole of the welding gun (4) is pure tungsten, and the diameter of the tungsten pole is 3.2 mm.

3. The repair system of the auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy according to claim 1 is characterized in that: The diameter of the ceramic nozzle in the welding gun (4) is 12 mm.

4. The repair system of the auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy according to claim 1 is characterized in that: The diameter of the magnesium alloy welding wire suitable for the wire feeding mechanism (2) is 1.2 mm.

5. The repair system of the auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy according to claim 1, characterized in that: Along the moving direction of the welding gun (4), the wire feeding nozzle (5) is located at the front side of the welding gun (4).

6. A repair method for a repair system of an auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy according to any one of claims 1 to 5, characterized in that: The specific steps include: Step 1: Turn on the repair system: Turn on the TIG power supply (1), welding robot (3) and welding shielding gas; Step 2: Placing the magnesium alloy welding wire: placing the magnesium alloy welding wire on the wire feeding mechanism (2) so that the welding wire extends from the end of the wire feeding nozzle (5) to a length of 10 mm; adjusting the angle of the wire feeding nozzle (5) so that the end of the welding wire is located below the tungsten electrode of the welding gun (4); Step 3: Grinding and cleaning the surface of the magnesium alloy groove: The groove of the magnesium alloy plate is a V-shaped groove with a groove size of width: 20mm and depth: 5mm. Use an angle grinder to mechanically grind the magnesium alloy plate and the groove. After grinding, use alcohol to clean the magnesium alloy surface to ensure the surface is clean; Step 4: Repair path programming and parameter setting: fix the magnesium alloy plate on the upper surface of the heating table (7), use the teaching pendant of the welding robot (3) to program the repair path, and set the moving speed of the welding gun to not exceed 6mm / s; set the welding current from the TIG power supply (1), the welding current range is 160-180A, the distance between the tungsten electrode tip of the welding gun (4) and the tip of the magnesium alloy V-shaped groove is 2-3mm, the wire feeding speed is set to 2m / min, and the wire feeding program is executed after a delay of 3s after the TIG arc is started. At the end of each repair arc, the TIG arc is extinguished using a current slow-down program, and the wire feeding program is stopped at the same time; Step 5: Preheating temperature selection: Set the preheating temperature based on the thermophysical properties of ZM6 magnesium alloy and the thickness of the sheet; Step 6: Heating strategy: Turn on the power of the heating platform (7), set the initial preheating temperature to 80°C, and start heating at a slow heating rate of 3°C / min, so that the heating platform (7) and the magnesium alloy plate are heated synchronously to allow the plate to initially adapt to the temperature change. When the temperature reaches 80°C, maintain the temperature for 10 minutes, use a handheld thermocouple to measure the temperature of the part to be repaired of the magnesium alloy plate to ensure that the temperature uniformity is within the range of ±5°C, and then increase the temperature to 150°C at a heating rate of 10°C / min. After reaching 150°C, maintain it for 10-15 minutes again for a second temperature balance, repeat the above temperature measurement and adjustment operations to ensure that the overall temperature of the plate is uniform, and finally increase the temperature to 200°C at a heating rate of 5°C / min; Step 7: Insulation strategy: When the surface temperature of the magnesium alloy plate is stabilized at 200±5°C, the insulation stage is entered, the temperature control parameters of the heating platform (7) are immediately locked, the power output display of the heating platform (7) is checked, and the power value at this time is recorded. At this time, the power of the heating platform (7) is accurately regulated by the temperature controller (13) to ensure that the plate temperature is always maintained within the range of 200±5°C; Step 8: Perform repair: When the surface temperature of the test plate is stabilized at 200±5°C and maintained for 5 minutes, arc repair is started and repair is performed according to the set program. During this period, the heating table (7) continuously heats the repair process. After each repair is completed, the magnesium alloy oxide on the surface of the repair layer is quickly cleaned off before the next repair is performed; Step 9: Finish repairing: Turn off the TIG power supply (1), welding robot (3), heating platform (7) and welding shielding gas. Allow the repaired magnesium alloy plate and heating platform (7) to cool naturally in the air. After cooling to room temperature, remove the repaired magnesium alloy component and clean the repair platform (8).

7. The repair method of the repair system of the auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy according to claim 6 is characterized in that: In step 1, the welding shielding gas uses argon gas with a purity of 99.99%, and the argon gas flow rate is set to 10-15 L / min.

8. The repair method of the repair system of the auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy according to claim 6 is characterized in that: In step 5, for plates with a thickness of less than 5 mm, the preheating temperature is set at 180-200°C; for plates with a thickness of 5-15 mm, the preheating temperature is 200-220°C; for plates with a thickness of more than 15 mm, the preheating temperature is 220-250°C.

9. The repair method of the repair system of the auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy according to claim 6, characterized in that: In step 6, during the second temperature equalization process, local auxiliary heating measures are adopted for areas with low temperatures.

10. The repair method of the repair system of the auxiliary heat process for improving the arc welding repair performance of ZM6 magnesium alloy according to claim 9, characterized in that: The local auxiliary heating measure is to place heating elements in the area for targeted heating to ensure that the overall temperature of the board rises evenly.

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