A stainless steel pipe welding machine for preventing oxidation of weld

Abstract

The application provides a stainless steel welded pipe machine for preventing oxidation of welding seams, and relates to the technical field of welding equipment. The machine comprises a welding assembly, a cover member, a tailing member and a gas supply assembly. The tailing member comprises a lower groove member, a refrigeration fin and an upper groove member. The lower groove member is open towards a stainless steel pipe workpiece and forms a first channel with the workpiece. The upper groove member is fixedly connected to the side of the lower groove member away from the workpiece and forms a second channel. The refrigeration fin is clamped between the lower groove member and the upper groove member, with the cold end of the refrigeration fin facing the lower groove member and the hot end of the refrigeration fin facing the upper groove member. When the protective gas in the cover member flows to the tailing member, the protective gas forms first protective gas and second protective gas. The first protective gas flows through the first channel, is cooled after heat exchange with the cold end of the refrigeration fin, and realizes the dual functions of protection and cooling. The second protective gas flows through the second channel, is heat exchanged with the hot end of the refrigeration fin, and uses the gas disturbance effect to drive the external air to collectively forcibly radiate the hot end.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a stainless steel pipe welding machine that prevents weld oxidation. Background Technology

[0002] Stainless steel welded pipes are widely used in fields with strict requirements for pipeline quality, such as petrochemicals, food and pharmaceuticals, and nuclear power, due to their excellent corrosion resistance and good mechanical properties. The production of stainless steel welded pipes typically employs gas-shielded welding processes such as tungsten inert gas welding (TIG welding), which utilizes an inert gas (such as argon) to create a protective atmosphere in the welding area, isolating it from oxygen in the air and preventing oxidation of the high-temperature weld.

[0003] However, during high-speed automatic welding, the shielding gas ejected from the welding torch is prone to deviation due to excessive welding speed, causing the molten pool to be exposed to air. Simultaneously, if the high-temperature weld seam does not cool sufficiently after welding, it will still come into contact with air and undergo an oxidation reaction, forming an oxide scale (commonly known as "tempering color") on the weld surface, which can turn black or dark blue in severe cases. This oxidation not only affects the aesthetics of the weld seam but, more importantly, reduces the chromium content in the weld area, weakens the corrosion resistance of the stainless steel, and even increases susceptibility to intergranular corrosion, seriously affecting the service life and safety of the welded pipe.

[0004] In the prior art, measures commonly taken to mitigate weld oxidation include: installing a simple protective gas shield at the rear of the welding torch to extend the gas protection time, or filling the pipe with protective gas to prevent root oxidation of the weld; some improved devices also indirectly assist in weld cooling by installing a cooling chamber inside the protective gas shield and circulating cooling water to cool the device body.

[0005] However, existing anti-oxidation devices for stainless steel welded pipes still have the following shortcomings: First, their structure is relatively simple, mainly preventing oxidation by extending the gas protection zone, with limited control over the weld cooling rate, leaving the weld in a high-temperature oxidation-sensitive range for a considerable period. Second, they lack active cooling methods; even those devices with cooling structures can only cool the device body, unable to directly and rapidly cool the weld area, resulting in unsatisfactory cooling efficiency and effect. Third, their function is relatively singular; the protective gas is only used as an isolation medium, its thermodynamic properties are not fully utilized, and gas protection and weld cooling are usually accomplished by separate devices, leading to complex equipment structures, large space requirements, and difficulty in achieving efficient follow-up protection. To address these issues, there is an urgent need to develop an anti-oxidation device for stainless steel welded pipe machines that can achieve efficient follow-up cooling, has a compact structure, and controllable cooling effect. Summary of the Invention

[0006] This invention provides a stainless steel welded pipe machine that prevents weld oxidation, thereby addressing the shortcomings of existing anti-oxidation stainless steel welded pipe devices in terms of cooling effect, structural compactness, and cooling controllability.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A stainless steel pipe welding machine for preventing weld oxidation, comprising:

[0009] Welding assembly, and a cover component fixedly connected to the welding assembly for forming a protective area at the weld joint of a stainless steel pipe workpiece; and

[0010] A gas supply assembly for delivering protective gas to the protected area;

[0011] It also includes: a trailing component, which is fixedly installed on the side of the cover component away from the welding direction, so that the stainless steel tube workpiece area after being welded by the welding assembly passes through the trailing component.

[0012] The trailing component includes:

[0013] The lower groove component has its opening facing the stainless steel tube workpiece, forming a first channel between it and the stainless steel tube workpiece.

[0014] The upper groove component is fixedly connected to the side of the lower groove component facing away from the stainless steel tube workpiece, and forms a second gas channel; and

[0015] A cooling element is sandwiched between the lower groove and the upper groove, with the cold end of the cooling element facing the lower groove and the hot end facing the upper groove.

[0016] When the protective gas inside the cover component flows to the trailing component, it forms a first protective gas and a second protective gas.

[0017] The first protective gas passes through the first channel and exchanges heat with the cold end of the cooling chip. After being cooled, it protects and cools the area of ​​the welded stainless steel tube workpiece.

[0018] The second protective gas passes through the second channel and exchanges heat with the hot end of the cooling chip, and together with the outside air, dissipates heat from the hot end of the cooling chip.

[0019] Preferably, it further includes: a support component, wherein the welding assembly and the cover component are fixedly connected to the support component, and the main unit of the gas supply assembly is fixedly connected to the top of the support component.

[0020] Preferably, the support member includes:

[0021] Two spaced-apart lifting support components;

[0022] The beam frame is fixedly connected to the top of the two aforementioned lifting support assemblies; and

[0023] A side bracket is fixedly connected to the inner side of one of the lifting support components;

[0024] The welding assembly is installed above the side bracket, and the cover is installed below the side bracket. The welding head of the welding assembly extends through the side bracket and the cover into the protected area.

[0025] Preferably, the lifting support assembly includes:

[0026] A connecting block, on one side of which a connecting plate is fixedly connected, and the connecting block has a threaded hole in the vertical direction;

[0027] An L-shaped support is provided above the connecting block, and a through hole corresponding to the threaded hole is provided on the horizontal part of the L-shaped support.

[0028] The connecting kit is fixedly connected to the horizontal part of the L-shaped support, and the center hole of the connecting kit corresponds to the through hole;

[0029] An adjusting shaft, the bottom end of which is threaded into a threaded hole, and the adjusting shaft passes through the through hole and the center hole of the connecting kit;

[0030] An upper cover is threaded to the top of the adjusting shaft, and a limiting ring is fixedly provided on the side of the adjusting shaft between the upper cover and the connecting kit.

[0031] Preferably, the cover component includes:

[0032] The channel shell has an opening facing the stainless steel tube workpiece. A baffle is fixedly connected to the end of the channel shell away from the trailing part. Guide side plates that are inclined outward are fixedly connected to the bottom of both side plates of the channel shell.

[0033] Adaptive spacers are provided in two form. Each guide side plate is fixedly connected to an adaptive spacer on its lower side. The lower side of the adaptive spacer is provided with multiple guide grooves that are spaced apart.

[0034] Each of the guide slots includes an upper guide section and a lower return guide section.

[0035] Preferably, a mating tooth is provided between the bottom of the adaptive septum and the bottom of the guide side plate.

[0036] Preferably, the adaptive spacer has a structure that is thinner at the top and thicker at the bottom.

[0037] Preferably, the air supply assembly includes: a main body unit, an outer pipe section, and an inner pipe section, which are connected in sequence. The outer pipe section is connected to the support component via a hanger, and the inner pipe section is located inside the cover component and has an air outlet hole on the side facing the welding point of the stainless steel pipe workpiece.

[0038] Preferably, the length of the trailing component is 80-150mm.

[0039] Preferably, the upper groove is provided with a plurality of parallel and spaced guide pieces inside, each guide piece including: a plug part and a main body part, the plug part being located inside the cover part and fixedly connected to the inner wall of the cover part.

[0040] This invention provides a stainless steel pipe welding machine for preventing weld oxidation. It utilizes a unique "sandwich" composite structure for the trailing component, comprising a lower groove, a cooling plate, and an upper groove. The lower groove opens towards the stainless steel pipe workpiece, forming a first channel with it. The upper groove is fixedly connected to the lower groove on the side facing away from the workpiece, forming a second channel. The cooling plate is sandwiched between the lower and upper grooves, with its cold end facing the lower groove and its hot end facing the upper groove. When the protective gas inside the casing flows to the trailing component, it forms a first protective gas and a second protective gas. The first protective gas flows through the first channel, exchanges heat with the cold end of the cooling plate, and is cooled, directly acting on the high-temperature weld area after welding, achieving a dual function of protection and cooling. The second protective gas flows through the second channel, exchanges heat with the hot end of the cooling plate, and utilizes the gas disturbance effect to drive the outside air to force heat dissipation from the hot end, ensuring the continuous and stable operation of the cooling plate. This structural design has at least the following beneficial effects:

[0041] 1. The combination of the cover and the tail component realizes protection during the welding process and the cooling process, making the structure more compact. Compared with the traditional gas protection and weld cooling, which are completed independently, it has the advantages of simple equipment structure, small space occupation, and can avoid the problem of cooling delay caused by functional area conversion.

[0042] 2. The cooling element actively cools the protective gas, reducing its temperature to 5-15°C, significantly lower than ambient temperature, thus enabling rapid cooling of the weld area. Thermodynamic analysis shows that the time required for the weld to cool from its peak temperature (approximately 1600°C) to its oxidation-sensitive temperature (below 450°C) can be reduced by 30-50%, effectively preventing severe oxidation caused by prolonged exposure of the weld to the 450-800°C sensitive temperature range. Compared to traditional devices relying on natural or indirect cooling, this active cooling method controls the weld color to a silvery-white or pale yellow, completely eliminating oxide scale and eliminating the need for subsequent pickling, significantly improving the appearance quality and corrosion resistance of the welded pipe.

[0043] 3. The cooling chip (semiconductor cooling chip) can be controlled within the range of 0-15℃ according to the power. It can achieve controllability of cooling according to the actual process requirements, optimize the welding process of stainless steel pipe fittings, and adapt to the needs of different workpieces. Attached Figure Description

[0044] Figure 1 This is a perspective view of a stainless steel pipe welding machine for preventing weld oxidation, as proposed in this invention.

[0045] Figure 2 This is a front view of a stainless steel pipe welding machine for preventing weld oxidation, as proposed in this invention.

[0046] Figure 3 for Figure 2 Cross-sectional view of section line AA in the middle;

[0047] Figure 4 for Figure 3 Enlarged view of section B in the middle;

[0048] Figure 5 This is a top view of a stainless steel pipe welding machine for preventing weld oxidation, as proposed in this invention.

[0049] Figure 6 for Figure 5 A sectional view of the section line at point CC;

[0050] Figure 7 This is a three-dimensional schematic diagram of a support component for a stainless steel pipe welding machine that prevents weld oxidation, as proposed in this invention.

[0051] Figure 8 This is a schematic diagram of the disassembly and installation of a stainless steel pipe welding machine for preventing weld oxidation, as proposed in this invention.

[0052] Figure 9 This is a perspective view of the cover and tail section of a stainless steel pipe welding machine for preventing weld oxidation, as proposed in this invention.

[0053] Figure 10 This is an exploded view of the tail section of a stainless steel welded pipe machine for preventing weld oxidation, as proposed in this invention.

[0054] Figure 11 This is a three-dimensional schematic diagram of an adaptive septum for a stainless steel welded pipe machine that prevents weld oxidation, as proposed in this invention.

[0055] Among them, 1. Support component; 101. Lifting support assembly; 1011. L-shaped support component; 1012. Connecting plate; 1013. Connecting block; 1014. Connecting kit; 1015. Adjusting shaft; 1016. Upper cover; 1017. Restriction ring; 102. Beam frame; 103. Side support; 1031. U-shaped bayonet; 1032. Vertical plate component; 2. Welding assembly; 3. Cover component; 301. Channel shell; 302. Baffle; 303. 1. Guide side plate; 304. Adaptive septum; 305. Guide groove; 3051. Guide section; 3052. Return guide section; 306. Mating gear; 4. Trailing part; 401. Lower groove part; 402. Cooling plate; 403. Upper groove part; 404. Guide plate; 4041. Insertion part; 4042. Main body part; 5. Air supply assembly; 501. Outer pipe part; 502. Inner pipe part; 503. Air outlet; a. First channel; b. Second channel. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] Example 1:

[0058] like Figures 1-11 As shown, this embodiment of the invention provides a stainless steel pipe welding machine for preventing weld oxidation, used for welding stainless steel pipe fittings; for example, arranged in a continuous welding production line system for stainless steel pipe fittings, the stainless steel pipe welding machine for preventing weld oxidation is fixed in position, and the system drives the stainless steel pipe fittings to move continuously, so as to realize continuous welding operations on stainless steel pipe fittings.

[0059] Specifically, it includes: welding assembly 2, cover assembly 3, trailing assembly 4, and air supply assembly 5.

[0060] Welding assembly 2 can be a commonly used TIG welder, PAW welder, etc.; for example, welding assembly 2 uses a tungsten inert gas (TIG) welding torch to perform continuous welding operations on stainless steel pipes with a wall thickness of less than 4mm. The cover 3 is fixedly connected to welding assembly 2 to form a protective zone at the welding point of the stainless steel pipe workpiece. Gas supply assembly 5 delivers protective gas (such as argon, helium, or other inert gases) into the protective zone. Welding assembly 2 completes the welding process within the protective zone. The trailing component 4 is fixedly installed on the side of the cover 3 away from the welding direction, allowing the welded portion to... After welding, the stainless steel pipe workpiece area of ​​component 2 passes through the tailing component 4. Taking the example of welding component 2 being fixed and stainless steel pipe moving, the stainless steel pipe passes through multiple sets of rollers in the production line system and is formed into a circular cross-section with a straight pre-reserved welding gap. It first passes through the protection area, where welding component 2 completes the welding process of the stainless steel pipe workpiece. Relying on the filling of protective gas, other air is eliminated, thereby avoiding oxidation of the high-temperature body during the welding process. The stainless steel pipe workpiece that has just been welded passes through the tailing component 4 and is cooled inside the tailing component 4.

[0061] Specifically, the trailing component 4 includes: a lower groove 401, an upper groove 403, and a cooling element 402 (a semiconductor cooling element or a semiconductor cooling element assembly); the opening of the lower groove 401 faces the stainless steel tube workpiece, forming a first channel a between it and the stainless steel tube workpiece. One end of the first channel a faces and connects to the protective area, and the other end faces and connects to the outside; the upper groove 403 is fixedly connected to the side of the lower groove 401 away from the stainless steel tube workpiece, forming a second gas channel b. One end of the second gas channel b faces and connects to the protective area, and the other end faces and connects to the outside. Furthermore, the upper groove 403 has an opening at the top, so the second gas channel b also has an opening on one side, allowing for better airflow with the outside air. The lower groove 401 and the upper groove 403 are connected back-to-back; for example, the opening of the lower groove 401 faces downward and the opening of the upper groove 403 faces upward, with the stainless steel tube workpiece located below the lower groove 401; the cooling plate 402 is sandwiched between the lower groove 401 and the upper groove 403, with the cold end of the cooling plate 402 facing the lower groove 401 and the hot end facing the upper groove 403; for example, the top of the lower groove 401 has a recessed receiving space, the cooling plate 402 is placed inside the recessed receiving space, and the bottom of the upper groove 403 is used as a cover plate to close it. The recessed receiving space is filled with a heat-conducting filling material, thereby ensuring that both sides of the cooling plate 402 have good heat transfer performance.

[0062] When the protective gas inside the cover component 3 flows to the trailing component 4, it forms a first protective gas and a second protective gas. The first protective gas passes through the first channel a and exchanges heat with the cold end of the cooling chip 402. After being cooled, it protects and cools the welded stainless steel tube workpiece area. It can be understood that the first protective gas inside the first channel a partially expels air and fills the interior of the first channel a. Therefore, the welded stainless steel tube workpiece area passing through the first channel a will not come into contact with oxygen, thus providing protection. The first protective gas is in a flowing state inside the first channel a, contacting the side wall of the lower groove component 401 and achieving heat exchange with the cold end of the cooling chip 402. This gas can protect and cool the welded stainless steel tube workpiece area. The welded stainless steel tube workpiece area is cooled; the second protective gas passes through the second channel b and exchanges heat with the hot end of the cooling chip 402, and drives the outside air to dissipate heat from the hot end of the cooling chip 402. It can be understood that a part of the gas inside the cover part 3 flows out through the second channel b, either entirely through the second channel b or from the opening on the side of the second channel b. On the one hand, it can disturb the flow of the surrounding air, making the air in contact with the side wall of the upper groove part 403 flow better; on the other hand, this part of the gas flows through the side wall of the upper groove part 403, and also carries some heat at the same time, realizing effective heat dissipation of the hot end of the cooling chip 402, so that the cooling chip 402 can work stably for a long time.

[0063] It is understandable that the gas supply component 5 delivers protective gas to the protected area in a continuous process. Throughout the welding operation, the gas supply component 5 continuously supplies protective gas according to the preset flow rate. Therefore, the first protective gas and the second protective gas are also in a continuous flow process.

[0064] In one embodiment, a support component 1 is also designed. The welding component 2 and the cover component 3 are fixedly connected to the support component 1. The main body unit of the gas supply component 5 is fixedly connected to the top of the support component 1. The main body unit of the gas supply component 5 is a protective gas supply unit, such as a high-pressure gas tank or a control valve group.

[0065] The designed support component 1 is used to install the welding assembly 2 and the cover component 3, so that they can be easily arranged in the production line system for continuous welding of stainless steel pipe fittings.

[0066] In one embodiment, the support member 1 includes: two lifting support assemblies 101, a beam frame 102, and a side support 103.

[0067] Two lifting support components 101 are spaced apart and distributed on both sides of the continuously produced stainless steel pipe workpiece. A beam frame 102 is fixedly connected to the top of the two lifting support components 101 to form a stable gate-shaped structure. A side support 103 is fixedly connected to the inside of one of the lifting support components 101. A welding component 2 is installed above the side support 103, and a cover component 3 is installed below the side support 103. The welding head of the welding component 2 extends into the protected area after passing through the side support 103 and the cover component 3.

[0068] In one feasible embodiment, a U-shaped bayonet 1031 is provided on the side bracket 103, and a vertical plate 1032 is fixedly connected to the bottom of the side bracket 103. The design of the U-shaped bayonet 1031 is conducive to the welding head of the welding assembly 2 being horizontally locked in the U-shaped bayonet 1031. A long slot is provided on the top of the cover 3, and the bottom of the welding head of the welding assembly 2 passes through the long slot and is inserted into the inside of the cover 3. The welding assembly 2 is fixedly installed by passing screws through the mounting plate on the side of the welding head and the pre-reserved mounting holes on the side bracket 103 (installation of the side bracket 103 and the welding head of the welding assembly 2). Then, the vertical plate 1032 is fixedly connected to the side of the cover 3. The side bracket 103 basically covers the long slot on the top of the cover 3, and the uncovered part can be covered by a sheet.

[0069] In one embodiment, the lifting support assembly 101 includes: a connecting block 1013, a connecting plate 1012, an L-shaped support member 1011, a connecting kit 1014, an adjusting shaft 1015, an upper cover 1016, and a limiting ring 1017.

[0070] A connecting plate 1012 is fixedly connected to one side of the connecting block 1013. The connecting plate 1012 is fixedly installed to the external bracket by bolts. A threaded hole is opened on the connecting block 1013 in the vertical direction. An L-shaped support 1011 is set above the connecting block 1013, and a through hole corresponding to the threaded hole is opened on the horizontal part of the L-shaped support 1011. A connecting kit 1014 is fixedly connected to the horizontal part of the L-shaped support 1011, and the center hole of the connecting kit 1014 corresponds to the through hole. The bottom end of the adjusting shaft 1015 is threadedly engaged with the threaded hole. The adjusting shaft 1015 passes through the through hole and the center hole of the connecting kit 1014. The upper cover 1016 is threadedly connected to the top end of the adjusting shaft 1015. A limiting ring 1017 is fixedly provided on the side of 015 between the upper cover 1016 and the connecting kit 1014. Based on the area between the upper cover 1016 and the connecting kit 1014, the axial movement between itself and the adjusting shaft 1015 is limited, which also limits the axial movement between the L-shaped support 1011 and the adjusting shaft 1015. By rotating the adjusting shaft 1015, the user can adjust the height of the adjusting shaft 1015 by threading it with the connecting block 1013. This will cause the upper cover 1016, the connecting kit 1014, and the L-shaped support 1011 to move up and down. Based on this structure, the overall height of the lifting support assembly 101 can be adjusted.

[0071] In one embodiment, the cover 3 includes: a channel shell 301, a guide side plate 303, a baffle 302, and an adaptive spacer 304.

[0072] The opening of the channel shell 301 faces the stainless steel tube workpiece. A baffle 302 is fixedly connected to the end of the channel shell 301 away from the trailing part 4. The baffle 302 is used to block one end of the channel shell 301. The bottom of both side plates of the channel shell 301 are fixedly connected to guide side plates 303 that are inclined outward. The guide side plates 303 are inclined downward and outward. The two guide side plates 303 are distributed in a figure-eight shape. Two adaptive spacers 304 are provided. An adaptive spacer 304 is fixedly connected to the lower side of each guide side plate 303. Multiple guide grooves 305 are spaced apart on the lower side of the adaptive spacer 304. Each guide groove 305 includes an upper guide section 3051 and a lower return guide section 3052.

[0073] The stainless steel tube workpiece is located below the cover component 3. The adaptive septum 304 forms a gap space with the outer side of the stainless steel tube workpiece. This gap space should not be designed too small, as there may be friction and collision between the adaptive septum 304 and the stainless steel tube workpiece; nor should it be designed too large, as the protective gas inside the protected area may overflow from here; it is generally designed to be 3-5mm. In this structure, multiple guide grooves 305 are designed. Each guide groove 305 includes an upper guide section 3051 and a lower return guide section 3052. After the protective gas passes through this gap, part of the gas is guided outward through the guide section 3051 and changes the airflow direction through the return guide section 3052, forming a partial countercurrent gas. When the subsequently overflowing gas meets this part of the countercurrent gas, it will cause this part to form a collision area, thereby hindering the rapid outflow of subsequent airflow.

[0074] In one embodiment, a mating tooth 306 is provided between the bottom of the adaptive spacer 304 and the bottom of the guide side plate 303. The mating tooth 306 includes the teeth and notches of the adaptive spacer 304 and the teeth and notches of the bottom of the guide side plate 303. The teeth and notches of both engage with each other, so that the adaptive spacer 304 and the guide side plate 303 can be stably connected. Especially when the adaptive spacer 304 rubs and collides with the stainless steel tube workpiece, a force along its length may be applied to the adaptive spacer 304. With the structure designed above, the adaptive spacer 304 can be prevented from falling off.

[0075] In one embodiment, the adaptive spacer 304 has a structure that is thin at the top and thick at the bottom, which is beneficial for opening multiple guide grooves 305 at the lower side of the adaptive spacer 304; and the specific dimensions of the adaptive spacer 304 with thin top and thick bottom can be designed separately, so that different adaptive spacers 304 can be replaced when changing the production requirements of different stainless steel pipe workpieces.

[0076] In one embodiment, the gas supply assembly 5 includes: a main body unit, an outer pipe section 501, and an inner pipe section 502. The main body unit, the outer pipe section 501, and the inner pipe section 502 are connected in sequence. The outer pipe section 501 is connected to the support member 1 through a hanger. The inner pipe section 502 is disposed on the inner side of the cover member 3 and has an air outlet 503 on the side facing the welding point of the stainless steel pipe workpiece.

[0077] The main unit is a high-pressure gas tank containing high-pressure protective gas. The protective gas inside flows through the outer pipe section 501 to the inner pipe section 502, and then is filled into the interior of the protected area through the gas outlet 503 on the side of the inner pipe section 502.

[0078] In one embodiment, it is necessary to cool the stainless steel tube workpiece after welding, generally to below 450°C, and make the length of the trailing part 4 80-150mm, for example, the length of the trailing part 4 is 100mm, 120mm, 135mm, etc.

[0079] In one embodiment, a plurality of parallel and spaced guide pieces 404 are fixedly disposed inside the upper groove member 403. Each guide piece 404 includes: a plug part 4041 and a main body part 4042. The plug part 4041 is located inside the cover member 3 and is fixedly connected to the inner wall of the cover member 3.

[0080] The plug-in portion 4041 and the main body portion 4042 act as heat dissipation fins inside the upper slot 403, which can increase the heat dissipation effect inside the upper slot 403. On the other hand, the design of the plug-in portion 4041 and the main body portion 4042 can guide more protective gas to completely pass through the second channel b of the upper slot 403, so as to improve the heat dissipation effect.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stainless steel pipe welding machine for preventing weld oxidation, comprising: Welding assembly (2) and cover (3) which are fixedly connected to welding assembly (2) and used to form a protective area at the welding point of stainless steel pipe workpiece. as well as Gas supply assembly (5) for supplying protective gas to the protected area; Its characteristic is that it further includes: The trailing part (4) is fixedly installed on the side of the cover part (3) away from the welding direction, so that the stainless steel pipe workpiece area after being welded by the welding assembly (2) passes through the trailing part (4). The cover component (3) includes: The channel shell (301) has an opening facing the stainless steel tube workpiece. A baffle (302) is fixedly connected to one end of the channel shell (301) away from the trailing part (4). Guide side plates (303) that are inclined outward are fixedly connected to the bottom of both side plates of the channel shell (301). An adaptive spacer (304) is provided, and two adaptive spacers (304) are provided. An adaptive spacer (304) is fixedly connected to the lower side of each guide side plate (303). The lower side of the adaptive spacer (304) is provided with a plurality of guide grooves (305) spaced apart. Each guide groove (305) includes an upper guide section (3051) and a lower return guide section (3052). A mating tooth (306) is provided between the bottom of the adaptive spacer (304) and the bottom of the guide side plate (303). The adaptive spacer (304) has a structure that is thin at the top and thick at the bottom. The trailing component (4) includes: The lower groove (401) has its opening facing the stainless steel tube workpiece, forming a first channel (a) between it and the stainless steel tube workpiece. The upper groove (403) is fixedly connected to the side of the lower groove (401) facing away from the stainless steel tube workpiece, and forms a second gas channel (b); and A cooling element (402) is sandwiched between the lower groove (401) and the upper groove (403), with the cold end of the cooling element (402) facing the lower groove (401) and the hot end facing the upper groove (403). When the protective gas inside the cover (3) flows to the trailing part (4), a first protective gas and a second protective gas are formed; The first protective gas passes through the first channel (a) and exchanges heat with the cold end of the cooling chip (402). After being cooled, it protects and cools the area of ​​the welded stainless steel tube workpiece. The second protective gas passes through the second channel (b) and exchanges heat with the hot end of the cooling chip (402), and drives the outside air to dissipate heat from the hot end of the cooling chip (402).

2. The stainless steel pipe welding machine for preventing weld oxidation according to claim 1, characterized in that, Also includes: The bracket (1), the welding assembly (2), and the cover assembly (3) are all fixedly connected to the bracket (1), and the main body unit of the gas supply assembly (5) is fixedly connected to the top of the bracket (1).

3. The stainless steel pipe welding machine for preventing weld oxidation according to claim 2, characterized in that, The support member (1) includes: Two spaced-apart lifting support components (101); The beam frame (102) is fixedly connected to the top of the two lifting support assemblies (101); and A side bracket (103) is fixedly connected to the inner side of one of the lifting support assemblies (101); The welding assembly (2) is installed above the side bracket (103), and the cover (3) is installed below the side bracket (103). The welding head of the welding assembly (2) extends into the protected area after passing through the side bracket (103) and the cover (3).

4. The stainless steel pipe welding machine for preventing weld oxidation according to claim 3, characterized in that, The lifting support assembly (101) includes: The connecting block (1013) has a connecting plate (1012) fixedly connected to one side, and the connecting block (1013) has a threaded hole in the vertical direction; An L-shaped support member (1011) is disposed above the connecting block (1013), and a through hole corresponding to the threaded hole is provided on the horizontal part of the L-shaped support member (1011); The connecting kit (1014) is fixedly connected to the horizontal part of the L-shaped support (1011), and the center hole of the connecting kit (1014) corresponds to the through hole; Adjusting shaft (1015), the bottom end of which is threaded into a threaded hole, the adjusting shaft (1015) passing through the through hole and the center hole of the connecting kit (1014); The upper cover (1016) is threaded to the top of the adjusting shaft (1015), and a limiting ring (1017) is fixedly provided on the side of the adjusting shaft (1015) and between the upper cover (1016) and the connecting kit (1014).

5. A stainless steel pipe welding machine for preventing weld oxidation according to claim 1, characterized in that, The gas supply assembly (5) includes: a main unit, an outer pipe section (501), and an inner pipe section (502). The main unit, the outer pipe section (501), and the inner pipe section (502) are connected in sequence. The outer pipe section (501) is connected to the support member (1) through a hanger. The inner pipe section (502) is located inside the cover member (3) and has an air outlet (503) on the side facing the welding point of the stainless steel pipe workpiece.

6. The stainless steel pipe welding machine for preventing weld oxidation according to claim 1, characterized in that: The length of the trailing part (4) is 80-150mm.

7. The stainless steel pipe welding machine for preventing weld oxidation according to claim 1, characterized in that: The upper groove (403) is fixedly provided with a plurality of parallel spaced guide pieces (404). Each guide piece (404) includes: a plug part (4041) and a main body part (4042). The plug part (4041) is located inside the cover part (3) and is fixedly connected to the inner wall of the cover part (3).

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