High-frequency induction heating wire auxiliary welding device for underwater welding and underwater welding method

Abstract

The invention relates to the technical field of underwater welding, and discloses a high-frequency induction hot wire auxiliary welding device for underwater welding and an underwater welding method.The device comprises a protective gas source, a welding robot, a high-frequency induction heating coil and an MIG welding gun; the MIG welding gun is located above the underwater welding base plate and provided with a shielding gas nozzle, the position of the MIG welding gun is adjusted, the extending length of the welding wire extending out of the MIG welding gun is adjusted, and a set distance is formed between the tail end of the welding wire and the underwater welding base plate; the high-frequency induction heating coil is arranged at a welding wire outlet of the MIG welding gun, surrounds a welding wire extending out of the MIG welding gun and is used for preheating the welding wire before welding; the high-frequency induction heating coil and the MIG welding gun are both arranged in the underwater environment and used for underwater welding. Underwater welding preheating of the welding wire is achieved by means of the high-frequency induction heating coil, the cooling effect of the water environment on the welding wire is reduced, the welding process is stable, and welding seam forming can be better controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater welding, and particularly to a high-frequency induction hot wire assisted welding device and an underwater welding method for underwater welding. Background Art

[0002] With the urgent demands for the development of marine resources, the utilization of marine space, and the maintenance of marine security under the new development situation, the development and utilization activities of water areas in China have accelerated significantly. The quantity, scale, offshore distance, and complexity of advanced facilities and major projects such as cross-sea bridges and tunnels, submarine oil and gas pipelines, advanced ships, large offshore engineering equipment, and marine pastures are increasing day by day, and the demand for on-site assembly welding is rising continuously. In addition, the marine service environment is harsh, and factors such as corrosion and wind and waves lead to a large number of regular maintenance and repair works for marine engineering structures. Therefore, there is an urgent need to develop reliable, efficient, adaptable, and large-scale production suitable underwater welding technologies.

[0003] The current underwater wet welding process has problems such as poor weld formation and low joint reliability, which restricts its application in high-value structures. And there are risks such as too fast joint cooling speed in the water environment, increased hardened structure caused by high hydrogen content, and decreased mechanical properties.

[0004] To solve the problem of a large amount of heat dissipation of the welding wire in the water environment, therefore, it is proposed to preheat the welding wire before welding to solve the influence of the water environment on the heat dissipation of the welding wire. At present, for this welding process, most of the relevant patents mainly focus on above-water dry welding, and there is no relevant research on the preheating of underwater welding wires. Summary of the Invention

[0005] The present invention provides a high-frequency induction hot wire assisted welding device and an underwater welding method for underwater welding. Before underwater welding, high-frequency induction is used as a heat source to preheat the welding wire to reduce the influence of the water environment on the cooling of the welding wire.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A high-frequency induction hot wire assisted welding device for underwater welding, characterized by comprising: a shielding gas source, a welding robot, a high-frequency induction heating coil, and a MIG welding gun;

[0008] The shielding gas source is used to provide shielding gas for underwater welding and is connected to a shielding gas nozzle;

[0009] The MIG welding gun is arranged at the execution end of the welding robot. The MIG welding gun is located above the underwater welding substrate and is provided with a shielding gas nozzle. The MIG welding gun and the underwater welding substrate are respectively connected to a welding power source;

[0010] The MIG welding torch is arranged at the execution end of the welding robot, the shielding gas nozzle is arranged at the MIG welding torch, and the MIG welding torch and the underwater welding substrate are respectively connected to the welding power source;

[0011] A wire feeding device is assembled on the MIG welding torch. The high-frequency induction heating coil is arranged at the wire outlet of the MIG welding torch and surrounds the wire extending out of the MIG welding torch to preheat the wire before welding. The high-frequency induction heating coil is connected to a high-frequency induction heating power source;

[0012] Both the high-frequency induction heating coil and the MIG welding torch are arranged in an underwater environment.

[0013] Further, the shielding gas source is used to provide argon with a purity of 99.999%.

[0014] Further, the welding robot is a six-axis welding robot.

[0015] Further, the high-frequency induction heating coil has 10 - 15 turns, an inner diameter of 12 mm, and a length of 80 mm.

[0016] The present invention also provides an underwater welding method based on the high-frequency induction hot wire assisted welding device for underwater welding, which is characterized by including the following steps:

[0017] S1 Fix the underwater welding substrate, place the MIG welding torch above the underwater welding substrate, adjust the position of the MIG welding torch and the extending length of the wire extending out of the MIG welding torch so that the distance between the end of the wire and the underwater welding substrate reaches a set distance; the MIG welding torch is located above the underwater welding substrate and is provided with a shielding gas nozzle, and preset the welding path movement program of the welding robot according to the welding requirements;

[0018] S2 Turn on the high-frequency induction heating power source and set the high-frequency induction heating power; turn on the welding power source and set the welding current and welding wire feeding speed; turn on the shielding gas source and set the flow rate of the shielding gas;

[0019] S3 Start the high-frequency induction heating power source, and the high-frequency induction heating coil preheats the wire before welding;

[0020] S4 After preheating for a certain time, start the welding power source, the shielding gas nozzle pre-passes the shielding gas, select the starting arc position on the underwater welding substrate and ignite the arc, start the preset welding path movement program of the welding robot, make the MIG welding torch and the underwater welding substrate move relatively, walk along the preset welding path, and perform underwater welding;

[0021] S5 After the welding path movement program is executed, extinguish the arc, continue to pass the shielding gas, and wait until the weld is completely solidified, then move the welding robot to make the welding torch return to the starting point;

[0022] S6. Turn off the high-frequency induction heating power supply, welding power supply and protective gas source switch, and the welding is completed.

[0023] Further, in S1, the protruding length of the welding wire extending from the MIG welding gun is 13 mm, and the set distance is 3 mm.

[0024] Further, the underwater welding substrate is a stainless steel 316L plate, and the welding wire is a stainless steel welding wire with the grade E316L-16 and a wire diameter of 1.0 mm.

[0025] Further, in S2, the high-frequency induction heating power is set to 5 - 25 kW, the welding current is set to 60 - 220 A, the welding wire feeding speed is set to 500 - 1000 mm / min, and the flow rate of the protective gas is set to 15 - 25 L / min.

[0026] Further, in S4, the specific preheating time is 2 s or more for preheating.

[0027] According to the specific embodiments provided by the present invention, the following technical effects are disclosed by the present invention:

[0028] (1) The high-frequency induction hot wire assisted welding device for underwater welding provided by the present invention is integrated with a high-frequency induction heating coil, a MIG welding gun and a welding robot. The welding method preheats the stainless steel welding wire to a certain temperature before feeding it into the arc by adjusting process parameters such as high-frequency induction heating power, welding current and wire feeding speed, so that the welding wire maintains a certain preheating temperature in the water environment, reducing the influence of the water environment on the heat dissipation at the tip of the welding wire. Finally, the weld surface is relatively uniform, the appearance is complete without cracks, the internal structure is uniform, and the mechanical properties meet the underwater welding standard.

[0029] (2) The present invention preheats the welding wire by the high-frequency induction heating coil before welding, solving problems such as a large amount of heat dissipation of the welding wire during underwater welding, resulting in a reduction in weld quality; through the preheating behavior of the welding wire before welding, the cooling effect of the water environment on the welding wire is reduced, making the welding process stable, enabling better control of the weld formation, increasing the welding deposition rate and welding speed, reducing the hydrogen content in the weld, reducing the generation of brittle tissues, and increasing the weld strength.

[0030] (3) The present invention effectively solves the problems of low weld quality formed due to heat dissipation of the welding wire during underwater welding and unstable welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the high-frequency induction hot wire assisted welding device for underwater welding of the present invention;

[0032] Figure 2Schematic diagram of the assembly structure of the MIG welding torch and high-frequency induction heating coil of the present invention;

[0033] Figure 3 Flow chart of the high-frequency induction hot wire assisted welding method for underwater welding of the present invention;

[0034] Explanation of reference numerals: 1 - shielding gas, 2 - welding robot, 3 - high-frequency induction heating coil, 4 - MIG welding torch, 5 - underwater welding substrate, 6 - water, 7 - welding power source, 8 - water tank. Detailed implementation manners

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0036] The object of the present invention is to provide a high-frequency induction hot wire assisted welding device and method for underwater welding, which uses a welding device integrated with a high-frequency induction heating coil, a MIG welding torch, and a welding robot. The welding path control is realized through the movement program set by the welding robot, and the underwater preheating before welding is realized by means of the high-frequency induction heating coil to assist underwater welding, ensuring that the surface of the weld is uniformly formed, the internal quality is qualified, and the mechanical properties meet the underwater welding standards.

[0037] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0038] As Figure 1 and Figure 2 shown, the high-frequency induction hot wire assisted welding device for underwater welding provided by the present invention includes: a shielding gas source 1, a welding robot 2, a high-frequency induction heating coil 3, and a MIG welding torch 4.

[0039] The MIG welding torch 4 is arranged at the execution end of the welding robot 2. The MIG welding torch 4 is located above the underwater welding substrate 5 and is provided with a shielding gas nozzle. The MIG welding torch 4 and the underwater welding substrate 5 are respectively connected to the welding power source 7; the shielding gas source 1 is connected to the shielding gas nozzle for providing shielding gas for underwater welding.

[0040] A wire feeding device is assembled on the MIG welding torch 4. The wire feeding device is used to supply welding wire, adjust the position of the MIG welding torch 4, and adjust the protruding length of the welding wire protruding from the MIG welding torch 4 so that a set distance is achieved between the end of the welding wire and the underwater welding substrate 5. The high-frequency induction heating coil 3 is arranged at the welding wire outlet of the MIG welding torch 4 and surrounds the welding wire protruding from the MIG welding torch 4. The high-frequency induction heating coil 3 is connected to a high-frequency induction heating power supply; the fixing method of the high-frequency induction heating coil 3 is not limited and can be adjusted according to actual needs. The high-frequency induction heating coil 3 is used to preheat the welding wire before welding; both the high-frequency induction heating coil 3 and the MIG welding torch 4 are arranged in an underwater environment for underwater welding.

[0041] Among them, the shielding gas source 1 is used to supply argon with a purity of 99.999%, and the welding robot 2 is a six-axis welding robot. The high-frequency induction heating coil 3 has 10 turns, an inner diameter of 12 mm, and a length of 80 mm.

[0042] The high-frequency induction heating coil 3, the MIG welding torch 4, and the underwater welding substrate 5 can be covered in a water tank 8 for underwater welding simulation and testing. The underwater welding substrate 5 is a stainless steel 316L plate with a length of 200 mm, a width of 100 mm, and a thickness of 20 mm; the welding wire is a stainless steel welding wire with a grade of E316L-16 and a wire diameter of 1.0 mm.

[0043] As Figure 3 shown, based on the above welding device, the present invention also provides a method for underwater welding, including the following steps:

[0044] S1 Fix the underwater welding substrate 5, adjust the position of the MIG welding torch 4 and the protruding length of the welding wire protruding from the MIG welding torch 4, such as 13 mm, so that a set distance of 3 mm is achieved between the end of the welding wire and the underwater welding substrate 5; the MIG welding torch is located above the underwater welding substrate 5 and is provided with a shielding gas nozzle, and preset the welding path movement program of the welding robot 2 according to the welding requirements; for example, the path of the movement program is a straight line with a length of 120 mm.

[0045] S2 Turn on the high-frequency induction heating power supply and set the high-frequency induction heating power; turn on the welding power supply 7, set the welding current and the welding wire feeding speed; turn on the shielding gas source 1 and set the flow rate of the shielding gas; among them, the high-frequency induction heating power is set to 5 - 25 kW, the welding current is set to 60 - 220 A, the welding wire feeding speed is set to 500 - 1000 mm / min, and the flow rate of the shielding gas is set to 15 - 25 L / min; for example, set the high-frequency induction heating power to 18 kW, turn on the welding power supply, set the welding current to 120 A, the welding wire feeding speed to 800 mm / min, and turn on the shielding gas to set the shielding gas flow rate to 20 L / min.

[0046] S3 activates the high-frequency induction heating power supply, and the high-frequency induction heating coil 3 preheats the welding wire before welding;

[0047] After preheating for 2 s in S4, the welding power supply is activated, the shielding gas nozzle pre-passes the shielding gas, the starting arc position is selected on the underwater welding substrate 5 and the arc is ignited, and the welding path movement program of the preset welding robot 2 is activated to make the MIG welding torch 4 and the underwater welding substrate 5 move relatively, walk along the preset welding path, and perform underwater welding;

[0048] After the execution of the welding path movement program in S5, the arc is extinguished, and the shielding gas continues to be passed. After the weld seam is completely solidified, the welding robot 2 is moved to make the welding torch return to the starting point;

[0049] S6 closes the switches of the high-frequency induction heating power supply, the welding power supply and the shielding gas source, and the welding is completed.

[0050] The underwater welding method proposed by the present invention uses a device integrated with a high-frequency induction heating coil, a MIG welding torch, and a welding robot, realizes route control through the movement program of the welding robot, and preheats the welding wire by means of the high-frequency induction heating coil to ensure that the surface of the weld seam is uniformly formed, the internal quality is qualified, and the mechanical properties meet the underwater welding standard.

[0051] The described embodiments are the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Without departing from the essential content of the present invention, any obvious improvements, substitutions or variations that those skilled in the art can make all belong to the protection scope of the present invention.

Claims

1. A high-frequency induction hot wire assisted welding device for underwater welding, characterized in that: include: A shielding gas source (1), a welding robot (2), a high-frequency induction heating coil (3) and a MIG welding gun (4); The shielding gas source (1) is used to provide shielding gas for underwater welding and is connected to the shielding gas nozzle; The MIG welding gun (4) is arranged on the execution end of the welding robot (2), the shielding gas nozzle is arranged at the MIG welding gun (4), and the MIG welding gun (4) and the underwater welding base plate (5) are respectively connected to a welding power source (7); The MIG welding gun (4) is equipped with a wire feeding device, the high-frequency induction heating coil (3) is arranged at the welding wire outlet of the MIG welding gun (4) and surrounds the welding wire extending out of the MIG welding gun (4) to preheat the welding wire before welding, and the high-frequency induction heating coil (3) is connected to a high-frequency induction heating power supply; The high-frequency induction heating coil (3) and the MIG welding gun (4) are both arranged in an underwater environment.

2. The high-frequency induction hot wire assisted welding device for underwater welding according to claim 1 is characterized in that: The protective gas source (1) is used to provide argon gas with a purity of 99.999%.

3. The high-frequency induction hot wire assisted welding device for underwater welding according to claim 1 is characterized in that: The welding robot (2) is a six-axis welding robot.

4. The high-frequency induction hot wire assisted welding device for underwater welding according to claim 1, characterized in that: The high-frequency induction heating coil (3) has 10-15 turns, an inner diameter of 12 mm and a length of 80 mm.

5. An underwater welding method based on the high-frequency induction hot wire assisted welding device for underwater welding according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1 fixes the underwater welding substrate (5) so that the MIG welding gun (4) is located above the underwater welding substrate (5), adjusts the position of the MIG welding gun (4) and adjusts the length of the welding wire extending from the MIG welding gun (4) so ​​that the end of the welding wire reaches a set distance from the underwater welding substrate (5); presets a welding path movement program of the welding robot (2) according to welding requirements; S2 connects the high-frequency induction heating power source and sets the high-frequency induction heating power; connects the welding power source (7) and sets the welding current and welding wire feeding speed; connects the shielding gas source (1) and sets the flow rate of the shielding gas; S3 starts the high-frequency induction heating power supply, and the high-frequency induction heating coil (3) preheats the welding wire before welding; S4 starts the welding power supply after preheating for a certain period of time, pre-flows the protective gas through the protective gas nozzle, selects the arc starting position on the underwater welding substrate (5) and ignites the arc, starts the preset welding path movement program of the welding robot (2), causes the MIG welding gun (4) and the underwater welding substrate (5) to move relative to each other, moves along the preset welding path, and performs underwater welding; After the welding path movement program S5 is executed, the arc is extinguished, the shielding gas is continued to flow, and after the weld is completely solidified, the welding robot (2) is moved to return the welding gun to the starting point; S6 turns off the high-frequency induction heating power supply, welding power supply and protective gas source switch, and welding is completed.

6. The high-frequency induction hot wire assisted welding device for underwater welding according to claim 1, characterized in that: The underwater welding substrate (5) is a stainless steel 316L plate, and the welding wire is a stainless steel welding wire with a grade of E316L-16 and a welding wire diameter of 1.0 mm.

7. The high-frequency induction hot wire assisted welding method for underwater welding according to claim 6, characterized in that: In S1, the length of the welding wire extending out of the MIG welding gun (4) is 13 mm, and the set distance is 3 mm.

8. The high-frequency induction hot wire assisted welding method for underwater welding according to claim 6, characterized in that: In S2, the high-frequency induction heating power is set to 5-25 kW, the welding current is set to 60-220 A, the welding wire feeding speed is set to 500-1000 mm / min, and the flow rate of the shielding gas is set to 15-25 L / min.

9. The high-frequency induction hot wire assisted welding method for underwater welding according to claim 6, characterized in that: In S4, the preheating time is specifically 2 seconds or longer.

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