CN114314922A - Textile printing and dyeing waste decoloring process and device - Google Patents

Abstract

The invention discloses a process and device for decolorizing textile printing and dyeing waste, and relates to the technical field of textile printing and dyeing. In order to solve the problem that the existing textile printing and dyeing waste includes solid waste and waste liquid, the solid-liquid separation is inconvenient, and the treatment efficiency and treatment quality are low. The problem. The slag removal mechanism includes a slag removal cavity and a first liquid discharge cavity, the first liquid discharge cavity includes a first liquid discharge port, and a first slag removal mechanism is installed inside the slag removal cavity. A second slag removal mechanism is installed inside the liquid chamber, a slot is arranged on one side of the first liquid discharge chamber, and the sedimentation tank includes a sedimentation chamber, a sewage collection bottom chamber and a second liquid discharge chamber. The sedimentation chamber An inclined pipe is installed inside the second liquid discharge chamber, an upper-layer liquid inlet is provided on one side of the second liquid discharge chamber, the sewage collecting bottom chamber includes a sewage discharge port, the second liquid discharge chamber includes a second liquid discharge port, and the first liquid discharge chamber includes a second liquid discharge port. A liquid inlet is provided above one side of a decolorizing mechanism, and a third liquid outlet is provided below the other side of the first decolorizing mechanism.

Description

A kind of textile printing and dyeing waste decolorization process and device

technical field

The invention relates to the technical field of textile printing and dyeing, in particular to a process and device for decolorizing textile printing and dyeing waste.

Background technique

With the growth of the population, the demand for textiles is also gradually increasing. Therefore, the textile printing and dyeing waste generated in the process of textile production is also increasing year by year. A textile needs to go through four production departments: fiber production, textile processing, dyeing and finishing, and forming processing. In each process, textile waste is generated. Textile printing and dyeing waste has a great impact on the environment, so it needs to be treated.

However, the existing textile printing and dyeing waste includes solid waste and waste liquid, which is inconvenient to separate the solid and liquid, and the treatment efficiency and treatment quality are low, so it does not meet the existing needs. For this, we propose a decolorization of textile printing and dyeing waste. process and equipment.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a decolorization process and device for textile printing and dyeing waste, so as to solve the problem that the existing textile printing and dyeing waste proposed in the above-mentioned background technology includes solid waste and waste liquid, the solid-liquid separation is inconvenient, and the treatment efficiency and treatment quality lower problem.

In order to achieve the above purpose, the present invention provides the following technical solutions: a textile printing and dyeing waste decolorization process and device, including a slag removal mechanism, a slag collection tank, a sedimentation tank, a first decolorization mechanism and a second decolorization mechanism, and the slag removal mechanism It includes a slag removal cavity and a first liquid discharge cavity, the first liquid discharge cavity includes a first liquid discharge port, a first slag removal mechanism is installed inside the slag removal cavity, and the first liquid discharge cavity is installed inside There is a second slag removal mechanism, one side of the first liquid discharge chamber is provided with a slot, the sedimentation tank includes a sedimentation chamber, a sewage collection bottom chamber and a second liquid discharge chamber, and the interior of the sedimentation chamber is installed with a slope. One side of the second liquid discharge chamber is provided with an upper-layer liquid inlet, the sewage collecting bottom chamber includes a sewage outlet, the second liquid discharge chamber includes a second liquid discharge port, and one side of the first decolorizing mechanism A liquid inlet is provided above the first decolorization mechanism, a third liquid discharge port is provided under the other side of the first decolorization mechanism, a number of partitions are installed inside the first decolorization mechanism, and the first decolorization mechanism includes a first decolorization mechanism. A decolorization chamber, a second decolorization chamber and a third decolorization chamber, one side of the second decolorization mechanism is provided with a liquid inlet chamber, the other side of the second decolorization mechanism is provided with a third liquid discharge chamber, and the second decolorization mechanism is provided with a third liquid discharge chamber. The decolorization mechanism includes activated carbon decolorization mechanisms, and three activated carbon decolorization mechanisms are provided.

Preferably, the first slag removal mechanism includes a conveyor belt and a drive motor, a plurality of slag scrapers are installed on the upper end of the conveyor belt, and a drive roller is arranged on the inner side of the conveyor belt, and the drive motor and the drive roller are connected by Shaft connection.

Preferably, the second slag removal mechanism includes a plurality of electric drums, and a drain gap is provided between the electric drums.

Preferably, the sedimentation tank includes a pump group, the pump group includes a backwash water inlet, one end of the pump group is installed with a backwash pipe, and the lower end of the backwash pipe is provided with a number of backwash water nozzles.

Preferably, a stirring motor is installed on the upper ends of the first decolorizing chamber, the second decolorizing chamber and the third decolorizing chamber, and a mixing shaft is installed at the lower end of the stirring motor, and the mixing shaft is located in the first decolorizing chamber, the third decolorizing chamber, and the third decolorizing chamber. The interior of the second decolorization chamber and the third decolorization chamber.

Preferably, the first decolorization chamber, the second decolorization chamber and the third decolorization chamber are all provided with decolorization reagent addition tubes on one side of the upper end.

Preferably, the activated carbon decolorization mechanism includes an installation cover, the lower end of the installation cover is provided with an activated carbon adsorption filter layer, and the activated carbon adsorption filter layer is fixedly connected to the installation cover slot, and the installation cover includes a first magnetic A suction block, the second decolorization mechanism includes a second magnetic suction block, and the second magnetic suction block is magnetically fixed to the first magnetic suction block.

Preferably, a filter screen is arranged between the slag removal chamber and the first liquid discharge chamber.

Preferably, a lifting handle is installed on the upper end of the mounting cover, and the mounting cover is welded to the lifting handle.

Compared with the prior art, the beneficial effects of the present invention are:

1. The conveyor belt of the first slag removal mechanism of the present invention drives a plurality of slag scrapers to move, and the slag scrapers can pick up the solid impurities in the waste water, and the solid impurities follow the conveyor belt to move synchronously, and finally fall to the first place under the action of their own gravity. The upper end of the second slag removal mechanism, the second slag removal mechanism transports the solid impurities to the inside of the slag collecting tank to realize the solid-liquid separation of the waste liquid, the structure is simple, the operation is convenient, and the continuous impurity removal of the waste water is realized;

2. The sedimentation tank of the present invention uses the principle of laminar flow to remove the suspended solids in the wastewater. The sedimentation tank is additionally provided with a backwashing pipe, which can periodically backwash the inclined pipe to flush out the suspended solids adhering to the surface of the inclined pipe, and the suspended solids are concentrated. The sediment is deposited inside the sewage collection bottom cavity and discharged through the sewage outlet. The sedimentation tank can continuously treat the wastewater for a long time without manual manual cleaning;

3. The first decolorization mechanism of the present invention includes three decolorization chambers, and a plurality of partitions inside the first decolorization mechanism together form a labyrinth structure. When the waste water enters the first decolorization mechanism, it first passes through the first decolorization chamber, and then passes through the first decolorization chamber. The second decolorization chamber finally passes through the third decolorization chamber. After the decolorization is completed, it is discharged through the third liquid outlet. The three decolorization reagent addition pipes add the polyaluminum chloride reagent for decolorization. The stirring motor drives the mixing shaft to mix wastewater and reagents, reagents It is fully contacted and reacted with the wastewater to precipitate and remove the generated coarse flocs to achieve the purpose of decolorization. The flocs are discharged through the sewage pipeline at the bottom of the first decolorization mechanism. The three decolorization chambers complete the decolorization of the wastewater during the flow of the wastewater. Improve decolorization efficiency and decolorization quality;

4. The second decolorization mechanism of the present invention decolorizes the wastewater again, and uses the adsorption principle of activated carbon for decolorization. The decolorization method is simple. The three groups of activated carbon decolorization mechanisms realize multiple adsorption and decolorization of wastewater, and can deodorize, dechlorinate, remove Organic matter and heavy metals, removal of synthetic detergents, bacteria, viruses and radioactive pollutants;

5. The activated carbon decolorization mechanism and the second decolorization mechanism of the present invention are fixed by the magnetic adsorption force between the first magnetic attraction block and the second magnetic attraction block, which is convenient to assemble and disassemble, and does not need to use auxiliary fasteners to replace the activated carbon decolorization mechanism. convenient.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the slag removing mechanism of the present invention;

Fig. 2 is the three-dimensional perspective view of the top view of the sedimentation tank of the present invention;

Fig. 3 is the front view structure schematic diagram of the first decolorization mechanism of the present invention;

Fig. 4 is the front view structure schematic diagram of the second decolorization mechanism of the present invention;

Fig. 5 is the structural representation of the first slag moving mechanism of the present invention;

Fig. 6 is the structural representation of the second slag moving mechanism of the present invention;

FIG. 7 is a diagram showing the connection relationship between the activated carbon decolorization mechanism and the second decolorization mechanism of the present invention.

In the figure: 1. Slag removal mechanism; 2. Slag collecting tank; 3. Sedimentation tank; 4. First decolorization mechanism; 5. Second decolorization mechanism; 6. Slag removal chamber; 7. First slag removal mechanism; 8. The first liquid discharge chamber; 9. The second slag removal mechanism; 10. The slotting; 11. The first liquid discharge port; 12, the sedimentation chamber; cavity; 16, upper liquid inlet; 17, pump group; 18, backwash water inlet; 19, backwash pipe; 20, sewage outlet; 21, second liquid outlet; 22, partition plate; 23, first decolorization chamber ; 24, the second decolorization chamber; 25, the third decolorization chamber; 26, the liquid inlet; 27, the third liquid outlet; 28, the stirring motor; 29, the mixing shaft; Liquid cavity; 32. Third liquid discharge cavity; 33. Activated carbon decolorization mechanism; 34. Installation cover plate; 35. Activated carbon adsorption filter layer; 36. First magnetic block; 37. Second magnetic block; 38. Conveyor belt ; 39, scraper; 40, drive roller; 41, drive motor; 42, electric drum; 43, filter screen.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.

Please refer to Figures 1-7, an embodiment provided by the present invention: a decolorization process and device for textile printing and dyeing waste, including a slag removal mechanism 1, a slag collection tank 2, a sedimentation tank 3, a first decolorization mechanism 4 and a second Decolorization mechanism 5, slag removal mechanism 1 includes a slag removal chamber 6 and a first liquid discharge chamber 8, the first liquid discharge chamber 8 includes a first liquid discharge port 11, and a first slag removal mechanism 7 is installed inside the slag removal chamber 6, A second slag removal mechanism 9 is installed inside the first liquid discharge chamber 8, a slot 10 is provided on one side of the first liquid discharge chamber 8, and the sedimentation tank 3 includes a sedimentation chamber 12, a sewage collection chamber 13 and a second liquid discharge The chamber 15, the inclined pipe 14 is installed inside the sedimentation chamber 12, the upper layer liquid inlet 16 is provided on one side of the second liquid discharge chamber 15, the sewage collection bottom chamber 13 includes a sewage outlet 20, and the second liquid discharge chamber 15 includes a second row Liquid port 21, a liquid inlet 26 is provided above one side of the first decolorizing mechanism 4, a third liquid outlet 27 is provided below the other side of the first decolorizing mechanism 4, and a number of partitions are installed inside the first decolorizing mechanism 4. Plate 22, the first decolorization mechanism 4 includes a first decolorization chamber 23, a second decolorization chamber 24 and a third decolorization chamber 25, one side of the second decolorization mechanism 5 is provided with a liquid inlet chamber 31, and the other side of the second decolorization mechanism 5 is provided. The side is provided with a third liquid discharge chamber 32, the second decolorization mechanism 5 includes an activated carbon decolorization mechanism 33, and three activated carbon decolorization mechanisms 33 are provided. , the decolorization efficiency and decolorization quality are improved. The wastewater after the first decolorization enters the interior of the second decolorization mechanism 5, and the second decolorization mechanism 5 decolorizes the wastewater again. The adsorption principle of activated carbon is used for decolorization. The decolorization method is simple. The activated carbon decolorization mechanism 33 realizes multiple adsorption and decolorization of wastewater, and can deodorize, dechlorinate, remove organic matter and heavy metals, and remove pollutants such as synthetic detergents, bacteria, viruses, and radioactivity. The liquid discharge chamber 32 completes the decolorization treatment of waste water.

Further, the first slag removal mechanism 7 includes a conveyor belt 38 and a drive motor 41. A plurality of slag scrapers 39 are installed on the upper end of the conveyor belt 38, and a drive roller 40 is provided on the inner side of the conveyor belt 38. The drive motor 41 and the drive roller 40 are connected by The shaft is connected, the drive motor 41 of the first slag removal mechanism 7 works to drive the drive roller 40, the drive roller 40 drives the conveyor belt 38, the conveyor belt 38 drives a plurality of slag scrapers 39 to move, and the slag scrapers 39 can remove the solids in the wastewater The impurities are picked up, the solid impurities follow the conveyor belt 38 and the slag scraper 39 to move synchronously, and finally the solid impurities fall to the upper end of the second slag moving mechanism 9 under the action of its own gravity.

Further, the second slag-moving mechanism 9 includes a plurality of electric drums 42, and a draining gap is arranged between the electric drums 42. The plurality of electric drums 42 of the second slag-moving mechanism 9 work, and the second slag-moving mechanism 9 transports solid impurities to Inside the slag collecting tank 2, the solid-liquid separation of the waste liquid is realized.

Further, the sedimentation tank 3 includes a pump group 17, the pump group 17 includes a backwash water inlet 18, one end of the pump group 17 is installed with a backwash pipe 19, and the lower end of the backwash pipe 19 is provided with a number of backwash water nozzles, which can be inclined regularly. The pipe 14 is backwashed to flush out the suspended solids adhering to the surface of the inclined pipe 14, and the suspended solids are concentrated in the interior of the sewage collecting bottom cavity 13 and discharged through the sewage outlet 20. The sedimentation tank 3 can process the wastewater continuously for a long time. No manual cleaning required.

Further, the upper ends of the first decolorization chamber 23, the second decolorization chamber 24 and the third decolorization chamber 25 are equipped with a stirring motor 28, and the lower end of the stirring motor 28 is equipped with a mixing shaft 29, and the mixing shaft 29 is located in the first decolorizing chamber. 23. Inside the second decolorization chamber 24 and the third decolorization chamber 25, the stirring motor 28 drives the mixing and stirring shaft 29 to mix the waste water and the reagent, and the reagent and the waste water are fully contacted and reacted.

Further, the first decolorization chamber 23 , the second decolorization chamber 24 and the third decolorization chamber 25 are all provided with decolorization reagent addition tubes 30 on one side of the upper end, and the three decolorization reagent addition tubes 30 add polyaluminum chloride reagent for decolorization.

Further, the activated carbon decolorization mechanism 33 includes an installation cover 34, the lower end of the installation cover 34 is provided with an activated carbon adsorption filter layer 35, and the activated carbon adsorption filter layer 35 is fixedly connected with the slot of the installation cover 34, and the installation cover 34 includes a first magnetic The suction block 36, the second decolorization mechanism 5 includes a second magnetic attraction block 37, and the second magnetic attraction block 37 is magnetically fixed with the first magnetic attraction block 36, and the activated carbon decolorization mechanism 33 and the second decolorization mechanism 5 pass through the first magnetic attraction. The magnetic adsorption force between the block 36 and the second magnetic attraction block 37 is fixed, the assembly and disassembly are convenient, the auxiliary fasteners are not required, and the replacement of the activated carbon decolorization mechanism 33 is convenient.

Further, a filter screen 43 is arranged between the slag removal chamber 6 and the first liquid discharge chamber 8 to intercept solid impurities.

Further, a lift handle is installed on the upper end of the installation cover 34, and the installation cover 34 is welded to the lift handle, the connection method is simple, and the lift handle facilitates the removal and installation of the activated carbon decolorization mechanism 33.

Working principle: During use, the waste water enters the interior of the slag removal mechanism 1, the liquid enters the interior of the first liquid discharge chamber 8 through the filter screen 43, and the drive motor 41 of the first slag removal mechanism 7 works to drive the drive roller 40, and the drive roller 40 The conveyor belt 38 is driven, and the conveyor belt 38 drives a plurality of slag scrapers 39 to move. The slag scrapers 39 can pick up the solid impurities in the wastewater. Gravity falls to the upper end of the second slag removal mechanism 9, the plurality of electric drums 42 of the second slag removal mechanism 9 work, and the second slag removal mechanism 9 transports the solid impurities to the inside of the slag collecting tank 2 to realize the solidification of the waste liquid. Liquid separation, the waste liquid for removing solid impurities is discharged through the first liquid discharge port 11, and enters the interior of the sedimentation chamber 12 from the bottom of the sedimentation tank 3, and the waste liquid passes through the inclined pipe 14. The inclined pipe 14 of the sedimentation tank 3 utilizes laminar flow The principle is to remove the suspended solids in the waste water. The supernatant liquid enters the second liquid discharge chamber 15 through the upper liquid inlet 16, and is finally discharged through the second liquid discharge port 21, and enters the inside of the first decolorization mechanism 4. The first decolorization mechanism 4 It includes three decolorization chambers, and the plurality of partitions 22 inside the first decolorization mechanism 4 together form a labyrinth structure. When the waste water enters the first decolorization mechanism 4, it first passes through the first decolorization chamber 23, and then passes through the second decolorization chamber 24. Finally, through the third decolorization chamber 25, after the decolorization is completed, it is discharged through the third liquid discharge port 27. The three decolorization reagent addition pipes 30 add the polyaluminum chloride reagent for decolorization, and the stirring motor 28 drives the mixing shaft 29 to mix wastewater and reagents. The reagent and the wastewater are fully contacted and reacted to precipitate and remove the generated coarse flocs to achieve the purpose of decolorization. The flocs are discharged through the sewage pipe at the bottom of the first decolorization mechanism 4, and the three decolorization chambers complete the wastewater flow in the process of wastewater flow. Decolorization improves the decolorization efficiency and decolorization quality. The wastewater after the first decolorization enters the interior of the second decolorization mechanism 5, and the second decolorization mechanism 5 decolorizes the wastewater again. The adsorption principle of activated carbon is used for decolorization. The decolorization method is simple and three. The activated carbon decolorization mechanism 33 realizes multiple adsorption and decolorization of wastewater, and can deodorize, dechlorinate, remove organic matter and heavy metals, and remove pollutants such as synthetic detergents, bacteria, viruses, and radioactivity. The three discharge chambers 32 complete the decolorization treatment of waste water. The sedimentation tank 3 is additionally provided with a backwashing pipe 19, which can periodically backwash the inclined pipe 14 to flush out the suspended solids adhering to the surface of the inclined pipe 14, and the suspended solids are concentrated in the collection The inside of the sewage bottom chamber 13 is discharged through the sewage outlet 20. The sedimentation tank 3 can continuously process the wastewater for a long time without manual cleaning. The activated carbon decolorization mechanism 33 and the second decolorization mechanism 5 pass through the first magnetic attraction block 36 and the second The magnetic adsorption force between the two magnetic attraction blocks 37 is fixed, the assembly and disassembly are convenient, the auxiliary fasteners are not required, and the replacement of the activated carbon decolorization mechanism 33 is convenient.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (9)

1. The utility model provides a textile printing and dyeing discarded object decoloration technology and device, includes that dross removal mechanism (1), collection sediment groove (2), sedimentation tank (3), first decoloration mechanism (4) and second decoloration mechanism (5), its characterized in that: the slag removing mechanism (1) comprises a slag removing cavity (6) and a first liquid discharging cavity (8), the first liquid discharging cavity (8) comprises a first liquid discharging port (11), a first slag moving mechanism (7) is installed inside the slag removing cavity (6), a second slag moving mechanism (9) is installed inside the first liquid discharging cavity (8), a slot (10) is formed in one side of the first liquid discharging cavity (8), the sedimentation tank (3) comprises a sedimentation cavity (12), a sewage collecting bottom cavity (13) and a second liquid discharging cavity (15), an inclined pipe (14) is installed inside the sedimentation cavity (12), an upper liquid inlet (16) is formed in one side of the second liquid discharging cavity (15), the sewage collecting bottom cavity (13) comprises a sewage draining port (20), the second liquid discharging cavity (15) comprises a second liquid discharging port (21), a liquid inlet (26) is formed in the upper portion of one side of the first decoloring mechanism (4), the below of first decoloration mechanism (4) opposite side is provided with third leakage fluid dram (27), the internally mounted of first decoloration mechanism (4) has a plurality of baffles (22), first decoloration mechanism (4) are including first decoloration chamber (23), second decoloration chamber (24) and third decoloration chamber (25), one side of second decoloration mechanism (5) is provided with feed liquor chamber (31), the opposite side of second decoloration mechanism (5) is provided with third leakage fluid dram (32), second decoloration mechanism (5) are including active carbon decoloration mechanism (33), active carbon decoloration mechanism (33) are provided with threely.

2. The textile printing and dyeing waste decoloring process and the textile printing and dyeing waste decoloring device according to claim 1, wherein the textile printing and dyeing waste decoloring process comprises the following steps: first move sediment mechanism (7) including conveyer belt (38) and driving motor (41), a plurality of scum boards (39) are installed to the upper end of conveyer belt (38), the inboard of conveyer belt (38) is provided with drive roller (40), driving motor (41) pass through the coupling joint with drive roller (40).

3. The textile printing and dyeing waste decoloring process and the textile printing and dyeing waste decoloring device according to claim 1, wherein the textile printing and dyeing waste decoloring process comprises the following steps: the second slag moving mechanism (9) comprises a plurality of electric rollers (42), and draining gaps are arranged among the electric rollers (42).

4. The textile printing and dyeing waste decoloring process and the textile printing and dyeing waste decoloring device according to claim 1, wherein the textile printing and dyeing waste decoloring process comprises the following steps: the sedimentation tank (3) comprises a pump set (17), the pump set (17) comprises a backwashing water inlet (18), a backwashing pipe (19) is installed at one end of the pump set (17), and a plurality of backwashing water nozzles are arranged at the lower end of the backwashing pipe (19).

5. The textile printing and dyeing waste decoloring process and the textile printing and dyeing waste decoloring device according to claim 1, wherein the textile printing and dyeing waste decoloring process comprises the following steps: agitator motor (28) are all installed to the upper end in first decoloration chamber (23), second decoloration chamber (24) and third decoloration chamber (25), mixing stirring shaft (29) are installed to the lower extreme of agitator motor (28), and mixing stirring shaft (29) are located the inside in first decoloration chamber (23), second decoloration chamber (24) and third decoloration chamber (25).

6. The textile printing and dyeing waste decoloring process and the textile printing and dyeing waste decoloring device according to claim 1, wherein the textile printing and dyeing waste decoloring process comprises the following steps: and one side of the upper ends of the first decolorizing cavity (23), the second decolorizing cavity (24) and the third decolorizing cavity (25) is provided with a decolorizing reagent adding pipe (30).

7. The textile printing and dyeing waste decoloring process and the textile printing and dyeing waste decoloring device according to claim 1, wherein the textile printing and dyeing waste decoloring process comprises the following steps: activated carbon decoloration mechanism (33) is including installation apron (34), the lower extreme of installation apron (34) is provided with activated carbon adsorption filter layer (35), and activated carbon adsorption filter layer (35) and installation apron (34) draw-in groove fixed connection, installation apron (34) is including first magnetism piece (36) of inhaling, second decoloration mechanism (5) is including second magnetism piece (37) of inhaling, and second magnetism piece (37) and first magnetism piece (36) of inhaling are fixed.

8. The textile printing and dyeing waste decoloring process and the textile printing and dyeing waste decoloring device according to claim 1, wherein the textile printing and dyeing waste decoloring process comprises the following steps: and a filtering separation net (43) is arranged between the deslagging cavity (6) and the first drainage cavity (8).

9. The textile printing and dyeing waste decoloring process and the textile printing and dyeing waste decoloring device according to claim 7, wherein the textile printing and dyeing waste decoloring process comprises the following steps: the upper end of the mounting cover plate (34) is provided with a lifting handle, and the mounting cover plate (34) is connected with the lifting handle in a welding mode.

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