Laser welding method for gas cylinder

Abstract

The application discloses a kind of laser welding devices for gas cylinder, belong to high-pressure gas cylinder welding technical field, solve the technical problem of unstable welding quality of the existing gas cylinder welding method.Laser welding device, including laser welding mechanism, plasma cloud removal mechanism and exhaust mechanism, and the weld of laser welding mechanism is welded gas cylinder;The air outlet of plasma cloud removal mechanism is towards weld;Exhaust mechanism is communicated with the gas outlet of gas cylinder.Laser welding method for gas cylinder, comprising the following steps: providing the laser welding device for gas cylinder;Using laser welding mechanism to weld the weld of gas cylinder;Obtain the real-time gas pressure value in the gas cylinder during welding;According to the obtained real-time gas pressure value, make exhaust mechanism match corresponding exhaust rate.The present application can improve the welding quality stability during welding gas cylinder, improve welding quality, and then improve welding effect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-pressure gas cylinder welding, and particularly relates to a laser welding method for a gas cylinder. BACKGROUND

[0002] High-pressure gas cylinders are mainly produced by manual tungsten argon arc welding. Due to the iteration of high-pressure gas cylinder materials and the conversion from titanium alloy to precipitation hardening hydrogen-resistant stainless steel, the manual tungsten argon arc welding method is difficult, the product welding difficulty is increased due to the influence of manual skills and welding material performance, the welding quality is unstable, the product yield is low, and a large amount of resources are wasted. SUMMARY

[0003] The application aims to at least solve the technical problem of unstable welding quality of the existing gas cylinder welding method to some extent, and therefore provides a laser welding method for a gas cylinder.

[0004] In order to achieve the above purpose, the technical scheme of the application is as follows:

[0005] The laser welding device for a gas cylinder comprises:

[0006] A laser welding mechanism for welding a weld of a gas cylinder;

[0007] A plasma cloud removal mechanism, wherein an air outlet of the plasma cloud removal mechanism faces the weld;

[0008] An exhaust mechanism in communication with an air outlet of the gas cylinder.

[0009] In some embodiments, the exhaust mechanism comprises a vacuum generator, the vacuum generator comprises an air inlet pipe, a compressed air inlet pipe and an exhaust pipe, the compressed air inlet pipe is connected with a compressed gas generator, and the air inlet pipe is in communication with the air outlet of the gas cylinder.

[0010] In some embodiments, a pressure gauge is arranged on the air inlet pipe.

[0011] In some embodiments, a gas pressure proportional valve is arranged between the compressed gas generator and the compressed air inlet pipe.

[0012] In some embodiments, the welding device further comprises a clamping mechanism for clamping the gas cylinder.

[0013] In some embodiments, the clamping mechanism comprises a horizontal rotary table, and a three-jaw chuck is arranged on the horizontal rotary table.

[0014] A laser welding method for a gas cylinder comprises the following steps:

[0015] The laser welding device for a gas cylinder is provided.

[0016] welding a weld of the gas cylinder using the laser welding mechanism;

[0017] obtaining a real-time gas pressure value in the gas cylinder during the welding process;

[0018] According to the obtained real-time gas pressure value, the exhaust mechanism is matched with a corresponding exhaust rate.

[0019] In some embodiments, during the process of welding the weld of the gas cylinder, the arc between the starting arc point and the ending arc point is greater than and less than .

[0020] In some embodiments, before the step of obtaining the real-time gas pressure value in the gas cylinder during the welding process, an initial gas pressure value in the gas cylinder is obtained.

[0021] In some embodiments, when the difference between the real-time gas pressure value and the initial gas pressure value is greater than 0.05 times the initial gas pressure value, the exhaust mechanism is started.

[0022] The embodiments of the present application have at least the following beneficial effects:

[0023] From the above technical solution, the laser welding device and method disclosed by the present application actively exhaust the gas in the gas cylinder through the exhaust mechanism, ensures that the gas pressure in the gas cylinder is similar or identical to the gas pressure in the work site, and further reduces the influence of the gas or gas pressure difference in the gas cylinder on the weld. In addition, the laser welding mechanism provides a stable welding heat source, and the plasma cloud removal mechanism ensures the stability of the laser welding mechanism, so that the present application has high welding efficiency, good weld quality, and high product yield of the gas cylinder during the process of welding the weld of the gas cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 shows the structural schematic diagram of the gas cylinder in the embodiments of the present application;

[0026] Figure 2 shows the three-dimensional structural schematic diagram of the laser welding device in the embodiments of the present application;

[0027] Figure 3 shows the structural schematic diagram of the exhaust mechanism in Figure 2 .

[0028] Figure 4 A flow structure schematic diagram of the laser welding method in the embodiment of the present application is shown;

[0029] Marked in the figure: 1-laser welding mechanism, 2-plasma cloud removal mechanism, 3-exhaust mechanism, 311-vacuum generator, 312-air inlet pipe, 313-compressed air inlet pipe, 314-exhaust pipe, 315-air pressure proportional valve, 316-silencer, 4-clamping mechanism, 5-gas cylinder, 501-air outlet, 502-welding seam, 6-controller. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] In addition, the reference numbers and / or reference letters can be repeated in different examples in the present application, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0032] The present application will be described below with reference to the drawings and specific embodiments:

[0033] As shown in Figure 1 , Figure 2 and Figure 3 , the present embodiment provides a laser welding device for gas cylinder, which is used for welding super-high pressure gas cylinder, referring to Figure 1 , such gas cylinder 5 is used for storing super-high pressure gas, and in order to ensure the sealing effect, the gas cylinder 5 is welded by two cylindrical pieces, and the gas cylinder 5 is provided with only one gas hole at one end thereof for filling of high-pressure gas and use of the gas, and the gas hole is provided with an air pipe having an air outlet 501, and the air pipe is provided with a valve, referring to Figure 2 The welding device includes a laser welding mechanism 1, a plasma cloud removal mechanism 2 and an exhaust mechanism 3, the laser welding mechanism 1 is used for welding the welding seam 502 on the gas cylinder 5. The air outlet of the plasma cloud removal mechanism 2 faces the welding seam 502, which is used for processing the plasma cloud formed in the laser welding process, facilitating the penetration of the laser and improving the stability and welding quality in the laser welding process.

[0034] The exhaust mechanism 3 is communicated with the gas outlet 501 of the gas cylinder 5, and the gas in the gas cylinder 5 is discharged during the welding process. Specifically, during the process of welding the weld 502 of the gas cylinder 5, the air in the gas cylinder 5 is heated and expanded and then overflows outward. However, the gas outlet 501 of the super-high-pressure gas cylinder 5 has a small caliber, so that the heated air overflows from the weld 502 of the gas cylinder 5, and then the weld 502 has a thin thickness and has pores or gaps. However, the application actively extracts the gas in the gas cylinder 5 through the exhaust mechanism 3, and ensures that the gas pressure in the gas cylinder 5 is similar or the same as the gas pressure in the working place, thereby reducing the influence of the gas or the gas pressure difference in the gas cylinder 5 on the weld 502. In addition, the laser welding mechanism 1 provides a stable welding heat source, and the plasma cloud removal mechanism 2 ensures the stability of the laser welding mechanism 1, so that the welding efficiency is high, the weld 502 quality is good, and the yield of the gas cylinder 5 is high during the process of welding the weld 502 of the gas cylinder 5.

[0035] With reference to Figure 3 The exhaust mechanism 3 includes a vacuum generator 311, and the vacuum generator 311 includes an air inlet pipe 312, a compressed gas inlet pipe 313, and an exhaust pipe 314. The compressed gas inlet pipe 313 is connected with a compressed gas generator. The air inlet pipe 312 is communicated with the gas outlet 501 of the gas cylinder 5. Specifically, the compressed gas generated by the compressed gas generator enters the vacuum generator 311 through the compressed gas inlet pipe 313 and is discharged from the exhaust pipe 314. The positive pressure gas source is used to generate negative pressure, so that the air in the gas cylinder 5 flows out through the air inlet pipe 312, the gas outflow rate in the gas cylinder 5 is accelerated, and the influence of the heated and expanded gas on the weld 502 is reduced. In addition, by adjusting the gas outlet rate of the compressed gas generator, the negative pressure of the vacuum generator 311 can be adjusted, and then the exhaust efficiency of the air inlet pipe 312 can be adjusted. A pressure gauge is arranged on the air inlet pipe 312, and the operator can adjust the gas outlet rate of the vacuum generator 311 according to the value displayed on the pressure gauge. A gas pressure proportional valve 315 is arranged between the compressed gas generator and the compressed gas inlet pipe 313, that is, the gas outlet rate of the compressed gas inlet pipe 313 is adjusted by the gas pressure proportional valve 315 in this embodiment, so that the adjustment accuracy is high and the operation is convenient. The laser welding mechanism 1 further includes a controller 6, and the controller 6 is electrically connected with the gas pressure proportional valve 315, so as to improve the adjustment accuracy and facilitate the operator to accurately control the rate in the compressed gas inlet pipe 313.

[0036] Further, a silencer 316 is arranged on the exhaust pipe 314 to reduce the noise generated during the exhaust process.

[0037] The welding device further includes a clamping mechanism 4, and the clamping mechanism 4 clamps the gas cylinder 5, so as to facilitate the laser welding mechanism 1 to weld the gas cylinder 5. With reference to Figure 2In the embodiment, the clamping mechanism 4 comprises a horizontal rotary table, and a three-jaw chuck is arranged on the horizontal rotary table. The three-jaw chuck clamps one end of the gas cylinder 5 and enables the gas cylinder 5 to rotate around the axis of the gas cylinder 5. Thus, the laser welding mechanism 1 and the plasma cloud removal mechanism 2 of the present application can remain stationary during the welding process. The welding operation of the laser welding mechanism 1 is realized by rotating the gas cylinder 5, and the precision is high. Further, for the two cylindrical parts constituting the gas cylinder 5, two three-jaw chucks can be used to clamp and synchronously rotate during the welding process. The clamping mechanism 4 enables the gas cylinder 5 to rotate at a uniform speed for a period of time, and thus the weld seams 502 at different positions on the gas cylinder 5 are heated more uniformly during the welding process, and the welding quality of the weld seams 502 is improved.

[0038] Based on the same inventive concept, as shown in Figure 4 The embodiment also provides a laser welding method for the ultra-high pressure gas cylinder 5, for welding the ultra-high pressure gas cylinder 5. The welding method comprises the following steps:

[0039] Step 100: providing the laser welding device for the gas cylinder 5.

[0040] Step 200: welding the weld seams 502 of the gas cylinder 5 using the laser welding mechanism 1.

[0041] Step 300: obtaining the real-time air pressure value in the gas cylinder 5 during the welding process.

[0042] Step 400: matching the corresponding exhaust rate of the exhaust mechanism 3 according to the obtained real-time air pressure value.

[0043] It can be understood that the heating degree of the air in the gas cylinder 5 is affected by the welding time and the ambient temperature. The laser welding device provided by the embodiment can ensure that the weld seams 502 at different positions are heated to the same or similar degree, and reduce the occurrence of thin thickness at the weld seams 502. At the same time, due to the same or similar heating degree of the weld seams 502, the air pressure increase in the gas cylinder 5 during the welding process will not increase or decrease greatly. Thus, after obtaining the real-time air pressure value, the operator does not need to change the exhaust rate of the exhaust mechanism 3 multiple times. The air pressure in the gas cylinder 5 is maintained within a certain range, the occurrence of pores or gaps in the weld seams 502 due to high air pressure in the gas cylinder 5 is reduced, and the weld seams 502 are uniform, and the welding quality is high.

[0044] Of course, the air pressure in the gas cylinder 5 will not change greatly at the beginning of the welding. The real-time air pressure value at the beginning of the welding can be taken as the reference air pressure value, and the difference between the real-time air pressure value and the reference air pressure value can be used to judge the exhaust rate of the exhaust mechanism 3. In order to further improve the adjustment accuracy of the exhaust rate, step 101 of obtaining the initial air pressure value in the gas cylinder 5 is further included.

[0045] Specifically, after the two cylinders of the gas cylinder 5 are respectively arranged and butted, the initial gas pressure value is obtained through the gas pressure gauge, and after the real-time gas pressure value is obtained, the difference between the initial gas pressure value and the real-time gas pressure value is obtained, and the exhaust rate corresponding to the difference is obtained through the difference. Considering that the gas cylinders 5 of different sizes, different materials and different wall thicknesses have different changes in gas pressure during the welding process, the operating personnel can obtain the exhaust rate that the exhaust mechanism 3 should match in different difference intervals according to the specifications of the gas cylinder 5 to be welded through multiple simulations or experiments, so as to ensure that the gas pressures inside and outside the gas cylinder 5 tend to be consistent.

[0046] Specifically, when the difference between the real-time gas pressure value and the initial gas pressure value is greater than 0.05 times the initial gas pressure value, the exhaust mechanism 3 is started, that is, when the difference between the real-time gas pressure value and the initial gas pressure value is not greater than 0.05 times the initial gas pressure value, the gas pressure error at this time will not have too much influence on the weld 502.

[0047] The embodiment also includes a step 102 of confirming whether the weld 502 meets the processing specifications before welding.

[0048] Specifically, the gap size of the weld 502 after the gas cylinder 5 is butted and assembled and the round runout size of the weld 502 when the gas cylinder 5 is clamped on the clamping mechanism 4 are detected, and welding operation is only performed when the gap of the weld 502 is not greater than 0.02 mm and the round runout of the weld 502 is not greater than 0.08 mm.

[0049] During the welding process, the welding focal length of the laser is 158 mm, the laser arc striking time is 0.2 s, the welding power is 8.3 KW, and the arc collecting time is 0.2 s. Further, in order to ensure the sealing performance of the gas cylinder 5, the arc degree between the arc striking point and the arc collecting point during the welding process of the weld 502 of the gas cylinder 5 is greater than 37π⁄18 and less than 7π⁄3, that is, the laser welding machine has an overlapping part in the weld 502 of the gas cylinder 5 in the axial direction, the tail of the weld 502 covers the head of the weld 502, and the integrity of the weld 502 is high.

[0050] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0052] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0053] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features limited by "first", "second" can include one or more of the features explicitly or implicitly. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0055] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present description.

[0056] In addition, the technical solutions among various embodiments can be combined with each other, but it must be based on that a person skilled in the art can realize, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0057] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, the scope of the present application is defined by the claims and their equivalents.

Claims

1. A laser welding method for a gas cylinder, characterized by, The method comprises the following steps: The laser welding device for gas cylinders comprises a clamping mechanism, a laser welding mechanism, and a plasma cloud removal mechanism. The clamping mechanism clamps the gas cylinder and comprises a horizontal rotary table provided with a three-jaw chuck. The laser welding mechanism welds the weld of the gas cylinder. The air outlet of the plasma cloud removal mechanism faces the weld. An exhaust mechanism is in communication with the gas outlet of the gas cylinder and comprises a vacuum generator. The vacuum generator comprises an air inlet pipe, a compressed air inlet pipe, and an exhaust pipe. A compressed gas generator is connected to the compressed air inlet pipe. The air inlet pipe is in communication with the gas outlet of the gas cylinder, and a pressure gauge is arranged on the air inlet pipe. An air pressure proportional valve is arranged between the compressed gas generator and the compressed air inlet pipe. The compressed gas generated by the compressed gas generator is discharged from the exhaust pipe after entering the vacuum generator through the compressed air inlet pipe. A positive pressure source is used to generate negative pressure, so that the air in the gas cylinder flows out through the air inlet pipe. An initial air pressure value in the gas cylinder is obtained. The gap size of the weld after butt joint assembly of the gas cylinder and the round runout size of the weld when the gas cylinder is clamped on the clamping mechanism are detected. Only when the gap of the weld is not greater than 0.02 mm and the round runout of the weld is not greater than 0.08 mm, the welding operation is performed. The laser welding mechanism is used to weld the weld of the gas cylinder, and the arc between the arc starting point and the arc ending point is greater than , and less than ; A real-time air pressure value in the gas cylinder during the welding process is obtained. According to the obtained real-time air pressure value, the exhaust mechanism is matched with the corresponding exhaust rate. When the difference between the real-time air pressure value and the initial air pressure value is greater than 0.05 times the initial air pressure value, the exhaust mechanism is started.

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