Automatic welding system

Abstract

The invention relates to the technical field of welding robots, in particular to an automatic welding system which comprises a bottom plate, an automatic welding robot, an adjusting nut, a protection nozzle, a contact tube, a welding smoke purifier and a base, the base is arranged at the top end of the bottom plate, and the automatic welding robot is installed at the top end of the base. An end opening of the automatic welding robot is provided with a current contact nozzle, the outer side of the current contact nozzle is sleeved with a protection nozzle, the end opening of the automatic welding robot is provided with an adjusting nut, the adjusting nut is used for adjusting the position of the current contact nozzle, and the top end of the bottom plate is provided with a welding smoke purifier. A smoke suction assembly is installed on the automatic welding robot, filtering assemblies are arranged at the input end of the welding smoke purifier and the output end of the smoke suction assembly, and a reverse blowing assembly is arranged between the filtering assemblies and the output end of the welding smoke purifier. The environmental protection property is improved, and the convenience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding robots, in particular to an automatic welding system. BACKGROUND

[0002] The automatic welding system is a highly automated welding device that integrates advanced machinery, electronics, computers, sensors, artificial intelligence and automatic control technologies. This robotic system can automatically perform welding tasks, greatly improving the efficiency and quality of the welding process, while reducing the need for manual operation and the risks that may occur during the welding process.

[0003] In the prior art, the patent document with publication number CN208743996U discloses a welding robot, which includes a mounting seat and a welding head. The welding head is arranged on the mounting seat to weld the pipe. A lifting device is arranged on the mounting seat, and the welding head is connected to the lifting device. The lifting device moves the welding head according to the position of the weld on the pipe to weld the weld on the pipe.

[0004] During use, it is found that the above-mentioned device will generate a large amount of smoke and dust during welding operations, which will affect the working environment and the health of the workers in the working environment. SUMMARY

[0005] To solve the above technical problems, the present application provides an automatic welding system with smoke and dust purification function.

[0006] The automatic welding system of the application comprises a bottom plate, an automatic welding robot, an adjusting nut, a protective nozzle, a conductive nozzle, a welding fume purifier and a base, the top end of the bottom plate is provided with the base, the top end of the base is installed with the automatic welding robot, the port of the automatic welding robot is provided with the conductive nozzle, the outer side of the conductive nozzle is sleeved with the protective nozzle, the port of the automatic welding robot is provided with the adjusting nut, the adjusting nut is used for adjusting the position of the conductive nozzle, the top end of the bottom plate is installed with the welding fume purifier, and the automatic welding system further comprises a smoke suction assembly, a filtering assembly and a back blowing assembly, the smoke suction assembly is installed on the automatic welding robot, the filtering assembly is arranged between the input end of the welding fume purifier and the output end of the smoke suction assembly, and the back blowing assembly is arranged between the filtering assembly and the output end of the welding fume purifier; in use, the fixed welding wire is arranged in the conductive nozzle, the protective nozzle and the conductive nozzle are driven by the automatic welding robot to adjust the position and angle, so that the welding wire is used for welding the workpiece, the welding fume generated during welding is started to be purged by the welding fume purifier, so that the welding fume is conveyed to the filtering assembly through the smoke suction assembly, the harmful gas in the welding fume is purified to form clean air after the large particles in the welding fume are screened and filtered by the filtering assembly, and then the clean air back blows the large particles in the filtering assembly, reduces the cleaning of the filtering assembly by the staff, improves the environmental protection, and improves the convenience.

[0007] Preferably, the smoke suction assembly comprises a fixing seat, a smoke suction cover, an exhaust flexible hose, a mounting seat and a buckle, the fixing seat is sleeved on the protective nozzle, the smoke suction cover is installed on the fixing seat, a plurality of mounting seats are installed on the automatic welding robot, one group of buckles is arranged on each mounting seat, the plurality of buckles are all connected with the exhaust flexible hose, the output end of the smoke suction cover is in communication with the input end of the exhaust flexible hose, and the output end of the exhaust flexible hose is in communication with the input end of the filtering assembly; the welding fume purifier is started, so that the welding fume generated during welding enters the filtering assembly through the exhaust flexible hose under the cooperation of the smoke suction cover and is filtered, the exhaust flexible hose changes in shape and length adaptively when the automatic welding robot adjusts the angle, the flexibility and the convenience are improved.

[0008] Preferably, the filter assembly includes a No. 1 tee pipe, a No. 1 vertical plate, a No. 2 tee pipe, a No. 2 vertical plate, an air supply pipe, a filter box, a filter solenoid valve, a filter screen, and a collection component. The No. 1 tee pipe is installed on the top of the base plate via the No. 1 vertical plate, and the No. 2 tee pipe is installed on the top of the base plate via the No. 2 vertical plate. The input end of the No. 1 tee pipe is connected to the output end of the exhaust telescopic flexible hose. The two sets of output ends of the No. 1 tee pipe are respectively connected to the input ends of the two sets of air supply pipes. The output ends of the two sets of air supply pipes are respectively connected to the two sets of input ends of the No. 2 tee pipe. The output end of the No. 2 tee pipe is connected to the input end of the welding fume purifier. Each set of air supply pipes is equipped with a filter box and two sets of filter solenoid valves. The filter box is located between the two sets of filter solenoid valves. Each set of filter boxes has a filter screen installed horizontally inside. Each filter box has a set of collection components at the bottom, and each set of filter boxes has a sealing component. In use, open the two sets of filter solenoid valves on the first set of air supply pipes and close the two sets of filter solenoid valves on the second set of air supply pipes. Simultaneously open the collection components corresponding to the second set of filter boxes, while keeping the first set of collection components closed. This allows the filter screen inside the first set of filter boxes to filter large particles of the fumes. After passing through the first set of filter screens, the fumes enter the welding fume purifier for further purification. The purified air then enters the second set of filter boxes, backflushing the filter screens inside to remove large particles. This allows the collection components on the first set of filter boxes to collect the large particles backflushed from the first set of filter screens, reducing the need for manual cleaning of the filter screens, improving convenience, and increasing welding efficiency.

[0009] Preferably, the collection assembly includes an external discharge pipe, an external discharge solenoid valve, an external threaded portion, an internal threaded cap, and a dust collector bag. An external discharge pipe is located at the bottom of the filter box, and an external discharge solenoid valve is installed on the external discharge pipe. An external threaded portion is located on the outer wall of the bottom end of the external discharge pipe, and the external threaded portion is threadedly connected to the internal threaded cap. The bottom end of the internal threaded cap is connected to the input end of the dust collector bag. In use, the first set of filter screens filters large particles of smoke and dust, causing the first set of external discharge solenoid valves to close and the second set of external discharge solenoid valves to open. This allows the purified air to backflush the large particles on the second set of filter screens into the second set of dust collector bags. The purified air is discharged through the dust collector bags, and the large particles are collected centrally through the dust collector bags. After collection, the operator rotates the internal threaded cap to separate it from the external threaded portion, allowing the operator to empty the large particles collected in the dust collector bags, improving flexibility and convenience.

[0010] Preferably, the backflush assembly includes a No. 3 tee pipe, a backflush pipe, a backflush solenoid valve, a rotary joint, a hollow disc, an air spray pipe, and an air spray head. The output end of the welding fume purifier is connected to the input end of the No. 3 tee pipe. The two sets of output ends of the No. 3 tee pipe are respectively connected to the input end of a set of backflush pipes. The output ends of the two sets of backflush pipes extend to the inside of a set of filter boxes and are rotatably connected to the top of a set of hollow discs through a set of rotary joints. Multiple sets of air spray pipes are respectively arranged on the outer wall of each set of hollow discs. The output of each set of air spray pipes... Each end is equipped with a set of air nozzles, and each set of backflush pipes is equipped with a set of backflush solenoid valves. When it is necessary to backflush the second set of filters with large particles, the second set of backflush solenoid valves is opened and the first set of backflush solenoid valves is closed, so that the purified air enters the second set of hollow discs through the second set of backflush pipes. Then, the purified air in the second set of hollow discs backflushes the second set of filters through multiple sets of air nozzles and multiple sets of air spray pipes. At the same time, the hollow discs rotate with the cooperation of the corresponding rotary joints to improve the backflush effect.

[0011] Preferably, the sealing assembly includes a sealing plate, locking bolts, and a handle. The sealing plate seals the filter box with the locking bolts, and the handle is installed on the sealing plate. When it is necessary to inspect or replace the filter screen inside the filter box, the operator can release the locking bolts from the sealing plate and remove the sealing plate using the handle, thus improving convenience.

[0012] Preferably, it also includes annular flat washers, with each set of locking bolts fitted with a set of annular flat washers; the locking bolts increase the contact area with the sealing plate through the annular flat washers, thereby improving the installation firmness.

[0013] Preferably, it also includes a handle cover, on the outside of the handle; the operator grips the handle with the handle cover to reduce the chance of slipping.

[0014] Preferably, it also includes anti-slip protrusions. Multiple sets of anti-slip protrusions are provided on the outer wall of the internal thread cap. With the cooperation of multiple sets of anti-slip protrusions, the operator can rotate the internal thread cap to reduce the chance of slipping.

[0015] Preferably, the filter screen is made of stainless steel.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In use, a fixed welding wire is threaded through the conductive nozzle, and the automatic welding robot is operated to adjust the position and angle of the protective nozzle and the conductive nozzle, so that the welding wire welds the workpiece. The fumes generated during welding are activated by the welding fume purifier, so that the fumes are transported to the filter assembly through the smoke extraction component. After the filter assembly screens and filters the large particles in the fumes, the harmful gases in the fumes enter the welding fume purifier for purification to form clean air. Then, the clean air back-blowing the large particles in the filter assembly reduces the need for workers to clean the filter assembly, improves environmental protection, and increases convenience. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first isometric structure of the present invention; Figure 2 yes Figure 1 A partially enlarged structural diagram of section A in the middle; Figure 3 This is a schematic diagram of the second isometric structure of the present invention; Figure 4 This is an enlarged structural diagram of the No. 3 three-way pipe and filter box, etc. Figure 5 This is an enlarged structural diagram of the filter screen and sealing plate, etc. Figure 6 It is an enlarged structural diagram of the handle and locking bolt, etc. Figure 7 This is an exploded structural diagram of structures such as the backflush pipe and filter box; Figure 8 This is an enlarged structural diagram of structures such as rotary joints and backflush pipes; Figure 9 This is an enlarged structural diagram of the filter screen and external drain pipe, etc. Figure 10 This is an enlarged structural diagram of components such as the internal thread cap and the dust collector bag.

[0018] The attached diagram shows the following markings: 101, base plate; 102, automatic welding robot; 103, adjusting nut; 104, protective nozzle; 105, conductive nozzle; 106, welding fume purifier; 107, base; 201, fixed seat; 202, fume hood; 203, exhaust telescopic hose; 204, mounting seat; 205, buckle; 301, No. 1 tee pipe; 302, No. 1 upright plate; 303, No. 2 tee pipe; 304, No. 2 upright plate; 305, air supply pipe; 306, filter box; 307. Filter solenoid valve; 308, filter screen; 401, external exhaust pipe; 402, external exhaust solenoid valve; 403, external thread part; 404, internal thread cap; 405, dust collector bag; 406, anti-slip protrusion; 501, No. 3 tee pipe; 502, backflush pipe; 503, backflush solenoid valve; 504, rotary joint; 505, hollow disc; 506, air spray pipe; 507, air spray head; 601, sealing plate; 602, locking bolt; 603, handle; 604, annular flat washer; 605, handle cover. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0020] Example 1 like Figures 1 to 10 As shown, an automatic welding system of the present invention includes a base plate 101, an automatic welding robot 102, an adjusting nut 103, a protective nozzle 104, a conductive nozzle 105, a welding fume purifier 106, and a base 107. The base 107 is provided at the top of the base plate 101, and the automatic welding robot 102 is installed at the top of the base 107. A conductive nozzle 105 is provided at the port of the automatic welding robot 102, and a protective nozzle 104 is fitted on the outside of the conductive nozzle 105. An adjusting nut 103 is provided at the port of the automatic welding robot 102 for adjusting the position of the conductive nozzle 105. The welding fume purifier 106 is installed at the top of the base plate 101. The system also includes a fume extraction component, a filter component, and a backflushing component. The fume extraction component is installed on the automatic welding robot 102. A filter component is provided at the input end of the welding fume purifier 106 and the output end of the fume extraction component. A backflushing component is provided between the filter component and the output end of the welding fume purifier 106. The fumigation assembly includes a fixed base 201, a fumigation hood 202, a flexible exhaust hose 203, a mounting base 204, and a buckle 205. The fixed base 201 is fitted onto the protective nozzle 104, and the fumigation hood 202 is mounted on the fixed base 201. The automatic welding robot 102 is equipped with multiple sets of mounting bases 204, and each set of mounting bases 204 is provided with a set of buckles 205. All sets of buckles 205 are engaged with the flexible exhaust hose 203. The output end of the fumigation hood 202 is connected to the input end of the flexible exhaust hose 203, and the output end of the flexible exhaust hose 203 is connected to the input end of the filter assembly. The filter assembly includes a first three-way pipe 301, a first vertical plate 302, a second three-way pipe 303, a second vertical plate 304, an air supply pipe 305, a filter box 306, a filter solenoid valve 307, a filter screen 308, and a collection component. The first three-way pipe 301 is installed at the top of the base plate 101 via the first vertical plate 302, and the second three-way pipe 303 is installed at the top of the base plate 101 via the second vertical plate 304. The input end of the first three-way pipe 301 is connected to the output end of the exhaust telescopic flexible hose 203, and the two output ends of the first three-way pipe 301 are respectively connected to the two sets of air supply pipes 305. The inlet is connected, and the output ends of the two sets of gas supply pipes 305 are respectively connected to the two sets of input ends of the No. 2 three-way pipe 303. The output end of the No. 2 three-way pipe 303 is connected to the input end of the welding fume purifier 106. Each set of gas supply pipes 305 is equipped with a set of filter boxes 306 and two sets of filter solenoid valves 307. The filter box 306 is between the two sets of filter solenoid valves 307. A set of filter screens 308 is installed horizontally inside each set of filter boxes 306. A set of collection components is set at the bottom of each set of filter boxes 306. A sealing component is set on each set of filter boxes 306. The collection assembly includes an external discharge pipe 401, an external discharge solenoid valve 402, an external threaded part 403, an internal threaded cap 404, and a dust collector bag 405. The bottom end of the filter box 306 is provided with an external discharge pipe 401, and the external discharge solenoid valve 402 is provided on the external discharge pipe 401. The outer side wall of the bottom end of the external discharge pipe 401 is provided with an external threaded part 403, which is threadedly connected to the internal threaded cap 404. The bottom end of the internal threaded cap 404 is connected to the input end of the dust collector bag 405. The backflush assembly includes a No. 3 three-way pipe 501, a backflush pipe 502, a backflush solenoid valve 503, a rotary joint 504, a hollow disc 505, an air spray pipe 506, and an air spray head 507. The output end of the welding fume purifier 106 is connected to the input end of the No. 3 three-way pipe 501. The two sets of output ends of the No. 3 three-way pipe 501 are respectively connected to the input end of a set of backflush pipes 502. The output ends of the two sets of backflush pipes 502 extend to the inner side of a set of filter boxes 306 and are rotatably connected to the top of a set of hollow discs 505 through a set of rotary joints 504. Multiple sets of air spray pipes 506 are respectively arranged on the outer wall of each set of hollow discs 505. Each set of air spray pipes 506 is provided with a set of air spray heads 507 at the output end of each set of air spray pipes 506. Each set of backflush pipes 502 is provided with a set of backflush solenoid valves 503.

[0021] In this embodiment, during use, a fixed welding wire is threaded through the conductive nozzle 105. The automatic welding robot 102 is operated to adjust the position and angle of the protective nozzle 104 and the conductive nozzle 105, thereby enabling the welding wire to weld the workpiece. The welding fume purifier 106 is activated during welding, allowing the welding fume to enter the filter assembly through the exhaust hood 202 and the flexible ventilation hose 203 for filtration. Two sets of filter solenoid valves 307 on the first set of air supply pipes 305 are opened, and two sets of filter solenoid valves 307 on the second set of air supply pipes 305 are closed. Simultaneously, the collection assembly corresponding to the second set of filter boxes 306 is opened, while the first set of collection assemblies remains closed. This allows the filter screen 308 inside the first set of filter boxes 306 to filter large particles of the fume. After being filtered by the first set of filter screens 308, the fume enters the welding fume purifier 106 for further purification. Afterwards, the purified air enters the second set of hollow discs 505 through the second set of backflush pipes 502. Then, the purified air in the second set of hollow discs 505 backflushes the second set of filter screens 308 through multiple sets of air spray pipes 506 and multiple sets of air spray heads 507. At the same time, the hollow discs 505 rotate with the cooperation of the corresponding rotary joints 504. The first set of exhaust solenoid valves 402 closes and the second set of exhaust solenoid valves 402 opens, so that the purified air backflushes the large particles on the second set of filter screens 308 into the interior of the second set of dust collector bags 405. The purified air is discharged through the dust collector bags 405, and the large particles are collected by the dust collector bags 405. After collection, the operator rotates the inner thread cap 404 to separate the inner thread cap 404 from the outer thread part 403. Then, the operator can empty the large particles collected in the dust collector bags 405.

[0022] Example 2 Based on Example 1, such as Figures 1 to 10As shown, an automatic welding system of the present invention includes a sealing assembly comprising a sealing plate 601, a locking bolt 602, and a handle 603. The sealing plate 601 seals the filter box 306 by means of the locking bolt 602, and the handle 603 is installed on the sealing plate 601. It also includes annular flat washers 604, anti-slip protrusions 406 and handle covers 605. Each set of locking bolts 602 is fitted with an annular flat washer 604. The handle 603 is fitted with handle covers 605 on the outside. The outer wall of the internal thread cap 404 is provided with multiple sets of anti-slip protrusions 406.

[0023] In this embodiment, when it is necessary to inspect or replace the filter screen 308 inside the filter box 306, the staff will release the locking bolt 602 from the sealing plate 601 and remove the sealing plate 601 by using the handle 603.

[0024] The main functions achieved by this invention are: 1. The fume hood 202 works in conjunction with the welding fume purifier 106 to adsorb the fumes generated during welding; 2. While the filter screen 308 filters out large particles of smoke and dust, the air purified by the welding fume purifier 106 back-flushes and cleans the large particles on another set of filter screen 308, improving convenience. 3. During the backflushing process, the 405 dust collector bag collects and dumps large particles that are blown off, improving convenience.

[0025] The automatic welding system of the present invention uses common mechanical methods for installation, connection, or setting, and can be implemented as long as it can achieve its beneficial effects. The welding fume purifier 106 has a built-in exhaust fan. The automatic welding robot 102, adjusting nut 103, protective nozzle 104, conductive nozzle 105, and welding fume purifier 106 of the automatic welding system of the present invention are commercially available. Technical personnel in the industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0026] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automatic welding system, comprising a base plate (101), an automatic welding robot (102), an adjusting nut (103), a protective nozzle (104), a conductive nozzle (105), a welding fume purifier (106) and a base (107), the base plate (101) is provided with the base (107) at the top end, the base (107) is provided with the automatic welding robot (102) at the top end, the automatic welding robot (102) is provided with the conductive nozzle (105) at the port, the conductive nozzle (105) is sleeved with the protective nozzle (104) outside, the port of the automatic welding robot (102) is provided with the adjusting nut (103), the adjusting nut (103) is used for adjusting the position of the conductive nozzle (105), the base plate (101) is provided with the welding fume purifier (106) at the top end, characterized in that, Also include smoke components, filter components and backwash components, the automatic welding robot (102) is installed with smoke components, the welding smoke purifier (106) input end is provided with filter components with smoke components output end, the filter components and welding smoke purifier (106) output end between the backwash components are provided with.

2. An automatic welding system as defined in claim 1, characterized in that The smoke component includes a fixed seat (201), a smoke cover (202), a flexible suction hose (203), a mounting seat (204) and a buckle (205), the protective mouth (104) is sleeved with the fixed seat (201), the smoke cover (202) is installed on the fixed seat (201), a plurality of mounting seats (204) are installed on the automatic welding robot (102), a group of buckles (205) are respectively arranged on each mounting seat (204), and the plurality of buckles (205) are connected with the flexible suction hose (203). The output end of the smoke cover (202) is communicated with the input end of the flexible suction hose (203), and the output end of the flexible suction hose (203) is communicated with the input end of the filter component.

3. An automatic welding system as defined in claim 2, wherein The filter component includes a first three-way pipe (301), a first vertical plate (302), a second three-way pipe (303), a second vertical plate (304), a gas conveying pipe (305), a filter box (306), a filter electromagnetic valve (307), a filter screen (308) and a collection component, the first three-way pipe (301) is installed on the top end of the bottom plate (101) through the first vertical plate (302), the second three-way pipe (303) is installed on the top end of the bottom plate (101) through the second vertical plate (304), the input end of the first three-way pipe (301) is communicated with the output end of the flexible suction hose (203), the two output ends of the first three-way pipe (301) are respectively communicated with the input ends of the two gas conveying pipes (305), the output ends of the two gas conveying pipes (305) are respectively communicated with the two input ends of the second three-way pipe (303), and the output end of the second three-way pipe (303) is communicated with the input end of the welding smoke purifier (106). A group of filter boxes (306) and two groups of filter electromagnetic valves (307) are respectively installed on each gas conveying pipe (305), the filter box (306) is between the two groups of filter electromagnetic valves (307), a group of filter screens (308) are horizontally installed in each filter box (306), a group of collection components are respectively arranged at the bottom end of each filter box (306), and a sealing component is arranged on each filter box (306).

4. An automatic welding system as defined in claim 3, wherein The collection component includes an outer discharge pipe (401), an outer discharge electromagnetic valve (402), an outer thread part (403), an inner thread cap (404) and a dust cloth bag (405), the bottom end of the filter box (306) is provided with the outer discharge pipe (401), the outer discharge pipe (401) is provided with the outer discharge electromagnetic valve (402), the outer thread part (403) is arranged on the outer side wall of the bottom end of the outer discharge pipe (401), the outer thread part (403) is threadedly connected with the inner thread cap (404), and the bottom end of the inner thread cap (404) is communicated with the input end of the dust cloth bag (405).

5. An automatic welding system as defined in claim 3, wherein, The back flushing assembly comprises No. 3 three-way pipe (501), back flushing pipe (502), back flushing electromagnetic valve (503), rotary joint (504), hollow disc (505), air blowing pipe (506) and air blowing head (507), the output end of the welding fume purifier (106) is communicated with the input end of No. 3 three-way pipe (501), the two groups of output ends of No. 3 three-way pipe (501) are respectively communicated with the input end of a group of back flushing pipe (502), the output ends of the two groups of back flushing pipe (502) respectively extend to the inner side of a group of filter boxes (306) and are rotatably communicated with the top end of a group of hollow discs (505) through a group of rotary joints (504), the outer side wall of each group of hollow discs (505) is respectively provided with a plurality of groups of air blowing pipes (506), the output end of each group of air blowing pipes (506) is respectively provided with a group of air blowing heads (507), and a group of back flushing electromagnetic valves (503) are respectively arranged on each group of back flushing pipe (502).

6. An automatic welding system as claimed in claim 5, characterized in that The sealing assembly comprises sealing plate (601), locking bolt (602) and handle (603), the sealing plate (601) seals the filter box (306) through the locking bolt (602), and the handle (603) is installed on the sealing plate (601).

7. An automatic welding system as claimed in claim 6, characterized in that Further comprising annular flat pad (604), a group of annular flat pads (604) are respectively sleeved on each group of locking bolts (602).

8. An automatic welding system as defined in claim 6, wherein, Further comprising handle sleeve (605), the handle (603) is sleeved with the handle sleeve (605) on the outside.

9. An automatic welding system as defined in claim 4, wherein, Further comprising anti-skid convex blocks (406), a plurality of groups of anti-skid convex blocks (406) are arranged on the outer side wall of the internally threaded cap (404).

10. An automatic welding system as defined in claim 3, wherein, The material of the filter screen (308) is stainless steel.

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