Welding method in high-humidity environment

Abstract

The invention discloses a welding method in a high-humidity environment, which comprises the following steps of: placing a workpiece to be welded in a drainage cover of a welding drainage device, filling protective gas into the drainage cover to form a local dry environment, and preparing arc striking welding; secondly, a humidity sensor is arranged in the drainage cover, the environment humidity in the drainage cover is detected, carbon dioxide gas or argon-rich mixed gas is adopted as protective gas for welding, in the welding process, the smoke condition of the welding environment is detected in real time, and when it is detected that the smoke concentration in the drainage cover exceeds the preset smoke concentration, welding is conducted; if yes, the gas in the drainage cover is pumped out of the drainage cover, filtered by the filtering device and then filled into the drainage cover again; and thirdly, after arc striking welding is completed, protective gas is continuously introduced for a period of time, and then hydrogen removal treatment after welding is conducted. The influence of the high-humidity environment on the welding process is effectively reduced, and the welding quality and stability are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of welding and relates to a welding method in a high humidity environment. Background Art

[0002] When welding in a high humidity environment, the moisture in the air is easily decomposed under the action of the high temperature arc to produce hydrogen, which in turn increases the hydrogen content in the weld, leading to quality problems such as cold cracks and hydrogen-induced delayed cracks in the welded joint. In addition, high humidity also affects the performance of welding materials, increases welding difficulty, and reduces welding efficiency. Therefore, it is particularly important to develop a method that can perform stable and efficient welding in a high humidity environment. Summary of the invention

[0003] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0004] Still another object of the present invention is to provide a soldering method in a high humidity environment.

[0005] To this end, the technical solution provided by the present invention is: A welding method in a high humidity environment comprises the following steps: Step 1: Place the workpiece to be welded in the drainage hood of the welding drainage device, and fill the drainage hood with pressurized protective gas until the water on the surface of the workpiece to be welded is flushed away and a local dry environment is formed in the drainage hood, so as to prepare for arc welding; Step 2: a humidity sensor is arranged in the drainage hood to detect the ambient humidity in the drainage hood. When the ambient humidity is less than 80%, carbon dioxide gas is used as the shielding gas for welding. When the ambient humidity is greater than or equal to 80%, argon-rich mixed gas is used as the shielding gas for welding. During the welding process, the humidity of the welding environment is monitored in real time. A smoke detector is arranged in the drainage hood to detect the smoke condition of the welding environment in real time during welding. When it is detected that the smoke concentration in the drainage hood exceeds the preset smoke concentration, the gas in the drainage hood is extracted out of the drainage hood, filtered by a filter device, and then filled into the drainage hood again; Step 3: After arc welding is completed, the protective gas is continuously introduced for a period of time, and then a post-weld dehydrogenation treatment is performed, and the welded workpiece is taken out from the drainage cover.

[0006] Preferably, in the welding method in a high humidity environment, the welding drainage device comprises: An inner cover body, wherein a space is formed inside the inner cover body to allow a welding gun to perform welding, the workpiece to be welded is placed inside the inner cover body, the inner cover body comprises an inner cover upper end located at the upper end and an inner cover lower end located at the lower end, the inner cover lower end is detachably connected to the inner cover upper end, and the inner cover lower end can move up and down along the axial direction of the inner cover upper end, and the humidity sensor is arranged on the inner wall of the inner cover body; An outer cover body is arranged outside the inner cover body, the smoke detector is arranged on the inner wall of the outer cover body near the lower end, the outer cover body and the inner cover body form a cover body middle cavity, the inner diameter of the cover body middle cavity decreases from top to bottom, the upper end of the outer cover body is provided with a first air inlet, the first air inlet is communicated with the cover body middle cavity, and the lower end of the outer cover body is provided with a heat-resistant sealing pad; the outer cover body and the inner cover body constitute the drainage cover; An upper cover closes the upper end opening of the drainage cover, a welding gun through hole is arranged in the center of the upper cover, an annular flow groove is arranged inside the upper cover along the circumference of the upper cover, the annular flow groove is only arranged correspondingly above the inner cover body, and a plurality of second air inlets are evenly spaced apart on the lower surface of the upper cover, and the plurality of second air inlets are all connected to the annular flow groove.

[0007] Preferably, in the welding method in a high humidity environment, the welding drainage device further comprises: An air charging part, comprising an air charging pump, a first air charging pipeline and a second air charging pipeline arranged beside the drainage cover, wherein the air outlet end of the air charging pump is respectively connected with one end of the first air charging pipeline and one end of the second air charging pipeline through a tee, the other end of the first air charging pipeline is connected with the first air inlet, and the other end of the second air charging pipeline is respectively connected with the plurality of second air inlets; The air extraction part includes a first air extraction pipeline, an air extraction pump, a second air extraction pipeline, a filter pump, a third air extraction pipeline, a pressure pump and an air supply pipeline arranged on the other side of the upper end of the drainage cover, one end of the first air extraction pipeline is connected with the air inlet end of the air extraction pump, the other end of the first air extraction pipeline is connected with the middle cavity of the cover body, the two ends of the second air extraction pipe are respectively connected with the air outlet end of the air extraction pump and the air inlet end of the filter pump, the two ends of the third air extraction pipeline are respectively connected with the air outlet end of the filter pump and the air inlet end of the pressure pump, one end of the air supply pipeline is connected with the air outlet end of the pressure pump and the other end is connected to the first inflation pipeline.

[0008] Preferably, in the welding method in a high humidity environment, the welding drainage device further comprises: The isolation cover is arranged outside the drainage cover, and the isolation cover is made of flexible material.

[0009] Preferably, in the welding method in a high humidity environment, the air intake flow rate of the first air inlet is 2.5-3 m / s, and the air intake flow rate of the second air inlet is 3-4 m / s.

[0010] Preferably, in the welding method in a high humidity environment, an annular heater is provided inside the upper cover and around the periphery of the annular flow groove.

[0011] Preferably, in the welding method in a high humidity environment, a sealing ring is provided between the welding gun through hole and the welding gun.

[0012] The present invention has at least the following beneficial effects: The present invention covers the surface of the workpiece to be welded by a drainage hood to form a local dry space; the moisture in the hood is discharged by inflation, so that the humidity in the hood is reduced to the welding allowable range. And according to the humidity in the drainage hood, a suitable protective air intake mechanical energy welding is selected. For example, when the ambient humidity is less than 80%, carbon dioxide gas is used as the protective gas for welding. When the ambient humidity is greater than or equal to 80%, argon-rich mixed gas is used as the protective gas for welding. The protective gas is selected according to the ambient humidity to ensure the welding quality. In addition, the present invention arranges a smoke detector in the drainage hood. During the welding process, the smoke condition of the welding environment is detected in real time. When it is detected that the smoke concentration in the drainage hood exceeds the preset smoke concentration, the gas in the drainage hood is extracted out of the drainage hood, and after being filtered by a filter device, it is filled into the drainage hood again, so that the normal pressure or low pressure state in the drainage hood can be adjusted in time. At the same time, the environment in the drainage hood can be made clear and highly visible, which is convenient for welding. And it avoids polluting the water environment during welding and avoids polluting the air. The present invention fills the drainage hood of the welding drainage device with pressurized protective gas, thereby draining the moisture from the drainage hood and forming a local dry environment, and maintaining the sealing of the drainage hood during the welding process, thereby ensuring the smooth progress of the welding process and the reliability of the welding quality; reducing the introduction of hydrogen during the welding process and the hydrogen content in the weld, reducing the risk of cold cracks and hydrogen-induced delayed cracks; effectively reducing the influence of the high humidity environment on the welding process, and improving the welding quality and stability.

[0013] The inner cover of the welding drainage device provided in the present invention comprises an inner cover upper end located at the upper end and an inner cover lower end located at the lower end, the inner cover lower end is detachably connected to the inner cover upper end, and the inner cover lower end can be moved up and down along the axial direction of the inner cover upper end, and the distance between the inner cover lower end and the workpiece to be welded can be adjusted according to the actual situation of the workpiece to be welded, so as to facilitate better welding, and the inner diameter of the cover body middle cavity between the outer cover body and the inner cover body becomes smaller and smaller from top to bottom, so that the pressure of the pressurized shielding gas entering the outer cover body is strengthened at the bottom of the cover body middle cavity to reach the maximum, so that other injections can be formed, so that the humidity in the drainage cover is further reduced. The upper cover of the present invention closes the upper end opening of the drainage cover, and a welding gun through hole is provided in the center, so that the welding gun can smoothly enter the inner cover body for welding, and an annular flow groove is provided inside the upper cover, and a plurality of second air inlets are evenly spaced and provided on the lower surface of the upper cover, and the plurality of second air inlets are all connected to the annular flow groove, and the pressurized shielding gas can be filled into it through the second air inlet. The invention introduces pressurized protective gas into the inner cover and the outer cover respectively through the gas filling part to remove water, and the invention extracts, filters, and pressurizes the gas generated by the smoke through the gas extraction part, and then re-fills it into the middle cavity of the cover for recycling, thereby reducing damage to the natural environment. The drainage capacity of the welding drainage device of the invention is greatly improved, and the setting of the two-layer cover greatly reduces the operation of water pressure on the arc, so that the arc has better free expansion and is more stable, and the welding effect is greatly improved.

[0014] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a schematic flow chart of a welding method in a high humidity environment in one of the schemes of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of a welding drainage device in one of the schemes of the present invention.

[0017] Figure 3 This is a schematic diagram of the structure of a welding drainage device in one of the schemes of the present invention. Figure 4 It is a schematic cross-sectional structural diagram of an upper cover in one of the solutions of the present invention. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0019] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other components or combinations thereof.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense. For example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The orientations or positional relationships indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] like Figure 1 As shown, the present invention provides a welding method in a high humidity environment, which comprises the following steps: Step 1: Thoroughly clean the workpiece to be welded, remove the oxide layer, water, rust, oil and other impurities, and ensure that the welding surface is dry and clean. Preheat the workpiece to be welded to an appropriate temperature to reduce stress concentration and crack tendency caused by excessive temperature difference during welding.

[0022] Place the workpiece to be welded in the drainage hood of the welding drainage device, fill the drainage hood with pressurized shielding gas, until the water on the surface of the workpiece to be welded is flushed away, and a local dry environment is formed in the drainage hood, ready for arc welding. Select low-hydrogen welding materials, including welding wire and shielding gas, to reduce the introduction of hydrogen during welding.

[0023] Step 2: Arrange a humidity sensor in the drainage hood to detect the ambient humidity in the drainage hood. When the ambient humidity is less than 80%, use carbon dioxide gas as the shielding gas for welding. When the ambient humidity is greater than or equal to 80%, use argon-rich mixed gas as the shielding gas for welding. During the welding process, monitor the humidity of the welding environment in real time. The argon-rich mixed gas can be a mixture of argon and carbon dioxide in a mixing ratio of 8:2 or 7:3, etc., or pure argon can be used as the shielding gas.

[0024] A smoke detector is arranged in the drain hood to detect the smoke conditions in the welding environment in real time during welding. When it is detected that the smoke concentration in the drain hood exceeds the preset smoke concentration, the gas in the drain hood is extracted out of the drain hood, filtered by a filter device, and then filled into the drain hood again.

[0025] A pressure sensor is arranged in the drainage cover to collect the pressure value in the drainage cover in real time.

[0026] During the welding process, the temperature, humidity, fume concentration, etc. of the welding environment are monitored in real time to ensure a stable welding environment.

[0027] Use reasonable welding sequence and welding parameters, such as welding the flange plate first and then the web plate, to reduce weld concentration and stress concentration.

[0028] Step 3: After arc welding is completed, the protective gas is continuously introduced for a period of time, such as more than 20 minutes, and then the post-weld dehydrogenation treatment is performed, and the welded workpiece is taken out of the drainage hood. According to the ambient temperature and humidity at the end of welding, appropriate dehydrogenation measures are taken, such as post-heat treatment or ultrasonic impact, to further reduce the hydrogen content in the weld.

[0029] Carry out visual inspection and internal quality inspection on the welds to ensure that the welding quality meets the standard requirements.

[0030] The present invention covers the surface of the workpiece to be welded by a drainage hood to form a local dry space; the moisture in the hood is discharged by inflation, so that the humidity in the hood is reduced to the welding allowable range. And according to the humidity in the drainage hood, a suitable protective air intake mechanical energy welding is selected. For example, when the ambient humidity is less than 80%, carbon dioxide gas is used as the protective gas for welding. When the ambient humidity is greater than or equal to 80%, argon-rich mixed gas is used as the protective gas for welding. The protective gas is selected according to the ambient humidity to ensure the welding quality. In addition, the present invention arranges a smoke detector in the drainage hood. During the welding process, the smoke condition of the welding environment is detected in real time. When it is detected that the smoke concentration in the drainage hood exceeds the preset smoke concentration, the gas in the drainage hood is extracted out of the drainage hood, and after being filtered by a filter device, it is filled into the drainage hood again, so that the normal pressure or low pressure state in the drainage hood can be adjusted in time. At the same time, the environment in the drainage hood can be made clear and highly visible, which is convenient for welding. And it avoids polluting the water environment during welding and avoids polluting the air. The present invention fills the drainage hood of the welding drainage device with pressurized protective gas, thereby draining the moisture from the drainage hood and forming a local dry environment, and maintaining the sealing of the drainage hood during the welding process, thereby ensuring the smooth progress of the welding process and the reliability of the welding quality; reducing the introduction of hydrogen during the welding process and the hydrogen content in the weld, reducing the risk of cold cracks and hydrogen-induced delayed cracks; effectively reducing the influence of the high humidity environment on the welding process, and improving the welding quality and stability.

[0031] In the above scheme, if Figure 2 , Figure 3 and Figure 4 As shown, preferably, the welding drainage device includes: The inner cover body 1 has a space inside which allows the welding gun to perform welding. The workpiece to be welded is placed in the inner cover body 1. The inner cover body 1 includes an inner cover upper end 101 located at the upper end and an inner cover lower end 102 located at the lower end. The inner cover lower end 102 is detachably connected to the inner cover upper end 101, and the inner cover lower end 102 can move up and down along the axial direction of the inner cover upper end 101. The humidity sensor is arranged on the inner wall of the inner cover body 1; preferably, the inner cover lower end 102 and the inner cover upper end 101 are provided with a plurality of circles of annular through holes along their radial direction, and each circle of annular through holes can be adjusted to be closed or opened, and each annular through hole is opened gradually from bottom to top, and the size of the opening is adjustable. In order to timely grasp and regulate the humidity and pressure of the inner and outer covers.

[0032] The outer cover body 2 is arranged on the outside of the inner cover body 1, and the smoke detector is arranged on the inner wall of the outer cover body 2 near the lower end. The outer cover body 2 and the inner cover body 1 form a cover body middle cavity, and the inner diameter of the cover body middle cavity decreases from top to bottom. The upper end of the outer cover body 2 is provided with a first air inlet 301, and the first air inlet 301 is connected with the cover body middle cavity. The lower end of the outer cover body 2 is provided with a heat-resistant sealing pad; the outer cover body 2 and the inner cover body 1 constitute the drainage cover.

[0033] The upper cover 3 closes the upper end opening of the drainage cover, a welding gun through hole 303 is arranged in the center of the upper cover 3, an annular flow groove 302 is arranged inside the upper cover 3 along the circumference of the upper cover 3, the annular flow groove 302 is only arranged correspondingly above the inner cover body 1, and not above the outer cover body 2, and a plurality of second air inlets are evenly spaced on the lower surface of the upper cover 3, and the plurality of second air inlets are all connected to the annular flow groove 302.

[0034] The inner cover body 1 of the welding drainage device provided in the present invention includes an inner cover upper end 101 located at the upper end and an inner cover lower end 102 located at the lower end, the inner cover lower end 102 is detachably connected to the inner cover upper end 101, and the inner cover lower end 102 can move up and down along the axial direction of the inner cover upper end 101, and can adjust the distance between the inner cover lower end 102 and the workpiece to be welded according to the actual situation of the workpiece to be welded, so as to facilitate better welding, and the inner diameter of the middle cavity of the cover body between the outer cover body 2 and the inner cover body 1 becomes smaller and smaller from top to bottom, so that the pressure of the pressurized protective gas entering the outer cover body 2 is strengthened at the bottom of the middle cavity of the cover body to reach the maximum, so that other injections can be formed, so that the humidity in the drainage cover is further reduced. The upper cover 3 of the present invention closes the upper end opening of the drainage cover, and a welding gun through hole 303 is provided in the center, so that the welding gun can smoothly enter the inner cover body 1 for welding, and an annular flow groove 302 is provided inside the upper cover 3, and a plurality of second air inlets are evenly spaced apart on the lower surface of the upper cover 3, and the plurality of second air inlets are all connected to the annular flow groove 302, and pressurized shielding gas can be filled into the annular flow groove 302 through the second air inlets. The drainage capacity of the welding drainage device of the present invention is greatly improved, and the setting of the two-layer cover body greatly reduces the influence of water pressure on the operation of the arc, so that the arc has better free expansion and is more stable, and the welding effect is greatly improved.

[0035] In the above scheme, preferably, the welding drainage device further includes: The inflation part includes an inflation pump 5, a first inflation pipeline and a second inflation pipeline arranged next to the drainage cover. The outlet end of the inflation pump 5 is connected with one end of the first inflation pipeline and one end of the second inflation pipeline respectively through a tee, the other end of the first inflation pipeline is connected with the first air inlet 301, and the other end of the second inflation pipeline is connected with the multiple second air inlets respectively; the air inlet end of the inflation pump 5 is directly connected with the pressurized protective gas or through other pipelines.

[0036] The air extraction part includes a first air extraction pipeline, an air extraction pump 7, a second air extraction pipeline, a filter pump 8, a third air extraction pipeline, a pressure pump 9 and an air supply pipeline arranged on the other side of the upper end of the drainage cover, one end of the first air extraction pipeline is connected to the air inlet end of the air extraction pump 7, the other end of the first air extraction pipeline is connected to the middle cavity of the cover body, the two ends of the second air extraction pipe are respectively connected to the air outlet end of the air extraction pump 7 and the air inlet end of the filter pump 8, the two ends of the third air extraction pipeline are respectively connected to the air outlet end of the filter pump 8 and the air inlet end of the pressure pump 9, one end of the air supply pipeline is connected to the air outlet end of the pressure pump 9 and the other end is connected to the first inflation pipeline.

[0037] The present invention respectively introduces pressurized protective gas into the inner cover body 1 and the outer cover body 2 through the inflation part to remove water. In addition, the present invention extracts, filters, and pressurizes the gas generated by the smoke through the exhaust part, and then re-fills it into the middle cavity of the cover body for recycling, thereby reducing damage to the natural environment.

[0038] In one technical solution of the present invention, preferably, the welding drainage device further comprises: The isolation cover 6 is arranged outside the drainage cover and is made of a flexible material. The isolation cover 6 is used to further improve the water isolation effect.

[0039] In one technical solution of the present invention, preferably, the air velocity of the first air inlet 301 is 2.5-3 m / s, and the air velocity of the second air inlet is 3-4 m / s. The drainage effect is improved.

[0040] In one technical solution of the present invention, preferably, an annular heater is provided inside the upper cover 3 and outside the annular flow groove 302 to heat the gas in the annular flow groove 302 .

[0041] In one of the technical solutions of the present invention, preferably, a sealing ring 4 is provided between the welding gun through hole 303 and the welding gun to ensure better sealing.

[0042] In order to enable those skilled in the art to better understand the present invention, the following examples are provided for further explanation: The present invention provides a welding method in a high humidity environment, such as Figure 1 and Figure 2 As shown, it includes the following steps: Step 1: Thoroughly clean the workpiece to be welded, remove the oxide layer, water, rust, oil and other impurities, and ensure that the welding surface is dry and clean. Preheat the workpiece to be welded to an appropriate temperature to reduce stress concentration and crack tendency caused by excessive temperature difference during welding.

[0043] Place the workpiece to be welded in the drainage hood of the welding drainage device, fill the drainage hood with pressurized shielding gas, until the water on the surface of the workpiece to be welded is flushed away, and a local dry environment is formed in the drainage hood, ready for arc welding. Select low-hydrogen welding materials, including welding wire and shielding gas, to reduce the introduction of hydrogen during welding.

[0044] Step 2: Arrange a humidity sensor in the drainage hood to detect the ambient humidity in the drainage hood. When the ambient humidity is less than 80%, use carbon dioxide gas as the shielding gas for welding. When the ambient humidity is greater than or equal to 80%, use argon-rich mixed gas as the shielding gas for welding. During the welding process, monitor the humidity of the welding environment in real time. The argon-rich mixed gas can be a mixture of argon and carbon dioxide with a mixing ratio of 8:2, 7:3, etc., or pure argon can be used as the shielding gas.

[0045] A smoke detector is arranged in the drain hood to detect the smoke conditions in the welding environment in real time during welding. When it is detected that the smoke concentration in the drain hood exceeds the preset smoke concentration, the gas in the drain hood is extracted out of the drain hood, filtered by a filter device, and then filled into the drain hood again.

[0046] A pressure sensor is arranged in the drainage cover to collect the pressure value in the drainage cover in real time.

[0047] During the welding process, the temperature, humidity, fume concentration, etc. of the welding environment are monitored in real time to ensure a stable welding environment.

[0048] Use reasonable welding sequence and welding parameters, such as welding the flange plate first and then the web plate, to reduce weld concentration and stress concentration.

[0049] Step 3: After arc welding is completed, the protective gas is continuously introduced for a period of time, such as more than 20 minutes, and then the post-weld dehydrogenation treatment is performed, and the welded workpiece is taken out of the drainage hood. According to the ambient temperature and humidity at the end of welding, appropriate dehydrogenation measures are taken, such as post-heat treatment or ultrasonic impact, to further reduce the hydrogen content in the weld.

[0050] Carry out visual inspection and internal quality inspection on the welds to ensure that the welding quality meets the standard requirements.

[0051] The welding drainage device comprises: The inner cover body 1 has a space formed therein to allow the welding gun to perform welding. The workpiece to be welded is placed in the inner cover body 1. The inner cover body 1 includes an inner cover upper end 101 located at the upper end and an inner cover lower end 102 located at the lower end. The inner cover lower end 102 is detachably connected to the inner cover upper end 101, and the inner cover lower end 102 can move up and down along the axial direction of the inner cover upper end 101. The humidity sensor is arranged on the inner wall of the inner cover body 1; preferably, the inner cover lower end 102 and the inner cover upper end 101 are provided with a plurality of circles of annular through holes along their radial direction, and each circle of annular through holes can be adjusted to be closed or opened, and each annular through hole is opened gradually from bottom to top, and the size of the opening is adjustable. In order to timely grasp and regulate the humidity and pressure of the inner and outer covers 2 to be consistent.

[0052] The outer cover body 2 is arranged on the outside of the inner cover body 1, and the smoke detector is arranged on the inner wall of the outer cover body 2 near the lower end. The outer cover body 2 and the inner cover body 1 form a cover body middle cavity, and the inner diameter of the cover body middle cavity decreases from top to bottom. The upper end of the outer cover body 2 is provided with a first air inlet 301, and the first air inlet 301 is connected with the cover body middle cavity. The lower end of the outer cover body 2 is provided with a heat-resistant sealing pad; the outer cover body 2 and the inner cover body 1 constitute the drainage cover.

[0053] The upper cover 3 closes the upper end opening of the drainage cover, a welding gun through hole 303 is arranged in the center of the upper cover 3, an annular flow groove 302 is arranged inside the upper cover 3 along the circumference of the upper cover 3, the annular flow groove 302 is only arranged correspondingly above the inner cover body 1, and not above the outer cover body 2, and a plurality of second air inlets are evenly spaced on the lower surface of the upper cover 3, and the plurality of second air inlets are all connected to the annular flow groove 302.

[0054] The welding drainage device also includes: The inflation part includes an inflation pump 5, a first inflation pipeline and a second inflation pipeline arranged next to the drainage cover. The outlet end of the inflation pump 5 is connected with one end of the first inflation pipeline and one end of the second inflation pipeline respectively through a tee, the other end of the first inflation pipeline is connected with the first air inlet 301, and the other end of the second inflation pipeline is connected with the multiple second air inlets respectively; the air inlet end of the inflation pump 5 is directly connected with the pressurized protective gas or through other pipelines.

[0055] The air extraction part includes a first air extraction pipeline, an air extraction pump 7, a second air extraction pipeline, a filter pump 8, a third air extraction pipeline, a pressure pump 9 and an air supply pipeline arranged on the other side of the upper end of the drainage cover, one end of the first air extraction pipeline is connected to the air inlet end of the air extraction pump 7, the other end of the first air extraction pipeline is connected to the middle cavity of the cover body, the two ends of the second air extraction pipe are respectively connected to the air outlet end of the air extraction pump 7 and the air inlet end of the filter pump 8, the two ends of the third air extraction pipeline are respectively connected to the air outlet end of the filter pump 8 and the air inlet end of the pressure pump 9, one end of the air supply pipeline is connected to the air outlet end of the pressure pump 9 and the other end is connected to the first inflation pipeline.

[0056] The present invention respectively introduces pressurized protective gas into the inner cover body 1 and the outer cover body 2 through the inflation part to remove water. In addition, the present invention extracts, filters, and pressurizes the gas generated by the smoke through the exhaust part, and then re-fills it into the middle cavity of the cover body for recycling, thereby reducing damage to the natural environment.

[0057] The isolation cover 6 is arranged outside the drainage cover and is made of a flexible material. The isolation cover 6 is used to further improve the water isolation effect.

[0058] The air velocity of the first air inlet 301 is 3 m / s, and the air velocity of the second air inlet is 4 m / s, thereby improving the drainage effect.

[0059] An annular heater is arranged inside the upper cover 3 and outside the annular flow groove 302 to heat the gas in the annular flow groove 302 .

[0060] A sealing ring 4 is provided between the welding gun through hole 303 and the welding gun to ensure better sealing. Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A welding method in a high humidity environment, characterized in that: The steps include: Step 1: Place the workpiece to be welded in the drainage hood of the welding drainage device, and fill the drainage hood with pressurized protective gas until the water on the surface of the workpiece to be welded is flushed away and a local dry environment is formed in the drainage hood, so as to prepare for arc welding; Step 2: a humidity sensor is arranged in the drainage hood to detect the ambient humidity in the drainage hood. When the ambient humidity is less than 80%, carbon dioxide gas is used as the shielding gas for welding. When the ambient humidity is greater than or equal to 80%, argon-rich mixed gas is used as the shielding gas for welding. During the welding process, the humidity of the welding environment is monitored in real time. A smoke detector is arranged in the drainage hood to detect the smoke condition of the welding environment in real time during welding. When it is detected that the smoke concentration in the drainage hood exceeds the preset smoke concentration, the gas in the drainage hood is extracted out of the drainage hood, filtered by a filter device, and then filled into the drainage hood again; Step 3: After arc welding is completed, the protective gas is continuously introduced for a period of time, and then post-weld dehydrogenation treatment is performed, and the welded workpiece is taken out from the drainage cover.

2. The welding method in a high humidity environment according to claim 1, characterized in that: The welding drainage device comprises: An inner cover body, wherein a space is formed inside the inner cover body to allow a welding gun to perform welding, the workpiece to be welded is placed inside the inner cover body, the inner cover body comprises an inner cover upper end located at the upper end and an inner cover lower end located at the lower end, the inner cover lower end is detachably connected to the inner cover upper end, and the inner cover lower end can move up and down along the axial direction of the inner cover upper end, and the humidity sensor is arranged on the inner wall of the inner cover body; An outer cover body is arranged outside the inner cover body, the smoke detector is arranged on the inner wall of the outer cover body near the lower end, the outer cover body and the inner cover body form a cover body middle cavity, the inner diameter of the cover body middle cavity decreases from top to bottom, the upper end of the outer cover body is provided with a first air inlet, the first air inlet is communicated with the cover body middle cavity, and the lower end of the outer cover body is provided with a heat-resistant sealing pad; the outer cover body and the inner cover body constitute the drainage cover; An upper cover closes the upper end opening of the drainage cover, a welding gun through hole is arranged in the center of the upper cover, an annular flow groove is arranged inside the upper cover along the circumference of the upper cover, the annular flow groove is only arranged correspondingly above the inner cover body, and a plurality of second air inlets are evenly spaced apart on the lower surface of the upper cover, and the plurality of second air inlets are all connected to the annular flow groove.

3. The welding method in a high humidity environment as claimed in claim 2, characterized in that: The welding drainage device also includes: An air charging part, comprising an air charging pump, a first air charging pipeline and a second air charging pipeline arranged beside the drainage cover, wherein the air outlet end of the air charging pump is respectively connected with one end of the first air charging pipeline and one end of the second air charging pipeline through a tee, the other end of the first air charging pipeline is connected with the first air inlet, and the other end of the second air charging pipeline is respectively connected with the plurality of second air inlets; The air extraction part includes a first air extraction pipeline, an air extraction pump, a second air extraction pipeline, a filter pump, a third air extraction pipeline, a pressure pump and an air supply pipeline arranged on the other side of the upper end of the drainage cover, one end of the first air extraction pipeline is connected with the air inlet end of the air extraction pump, the other end of the first air extraction pipeline is connected with the middle cavity of the cover body, the two ends of the second air extraction pipe are respectively connected with the air outlet end of the air extraction pump and the air inlet end of the filter pump, the two ends of the third air extraction pipeline are respectively connected with the air outlet end of the filter pump and the air inlet end of the pressure pump, one end of the air supply pipeline is connected with the air outlet end of the pressure pump and the other end is connected to the first inflation pipeline.

4. The welding method in a high humidity environment as claimed in claim 2, characterized in that: The welding drainage device also includes: The isolation cover is arranged outside the drainage cover, and the isolation cover is made of flexible material.

5. The welding method in a high humidity environment as claimed in claim 2, characterized in that: The air intake velocity of the first air intake port is 2.5-3 m / s, and the air intake velocity of the second air intake port is 3-4 m / s.

6. The welding method in a high humidity environment as claimed in claim 2, characterized in that: An annular heater is arranged inside the upper cover and around the annular flow groove.

7. The welding method in a high humidity environment as claimed in claim 2, characterized in that: A sealing ring is arranged between the welding gun through hole and the welding gun.

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