Plasma arc welding tool

Abstract

The utility model discloses a plasma arc welding tool which comprises an operation table, an argon filling strip and a base plate, and an inflation hole is formed in the operation table. The argon filling strip is installed on the top face of the operation table, an argon filling groove extending in the longitudinal direction is formed by the argon filling strip, an opening of the argon filling groove faces upwards to form a welded junction, and a first partition plate is arranged in the argon filling groove and divides the argon filling groove into an upper gas storage chamber and a lower gas inlet chamber. A vent hole for communicating the gas storage chamber with the gas inlet chamber is formed in the first partition plate, and a gas inlet hole communicated with the gas filling hole is formed in the bottom of the argon filling strip; the gas inlet hole is used for filling argon into the gas inlet chamber; the two base plates are both placed on the operation table and located on the two sides, in the transverse direction, of the argon filling strip correspondingly, and the two base plates are used for containing two to-be-welded parts correspondingly so that the two to-be-welded parts can be in butt joint at a welding opening. And the first partition plate plays a role in buffering argon filled into the gas inlet chamber, so that the argon is more uniformly distributed in the gas storage chamber, the protection effect of the argon on a welding seam is better, and the forming quality of the welding seam is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of welding tooling, in particular to a tooling for plasma arc welding. Background Art

[0002] Plasma arc welding refers to a method of welding using a plasma arc as a heat source. Due to the high energy density and strong penetration ability of the plasma arc, plasma arc welding can achieve single-sided penetration and double-sided forming without beveling or filling welding wire, and has a relatively fast welding speed. During the front welding process of plasma arc welding, argon gas is required to protect the back of the weld to prevent oxidation on the back of the weld.

[0003] In the construction of nuclear reactors, a large number of equipment such as reactor water pools and ASG water pools are covered with stainless steel. When plasma arc welding is used to weld the stainless steel covering of the water pool, due to the large volume of the welded parts, it is difficult to ensure that the argon gas is evenly distributed on the back of the weld of the entire welded part during the welding process, resulting in insufficient protection of the weld by the argon gas, affecting the forming quality of the weld. Utility Model Content

[0004] The main purpose of the utility model is to provide a plasma arc welding tool, aiming to solve the technical problem in the prior art that it is difficult to ensure that argon is evenly distributed on the back of the weld of the entire welded part during plasma arc welding of a large volume of welded parts, resulting in inadequate protection of the weld and affecting the forming quality of the weld.

[0005] To achieve the above-mentioned purpose, the plasma arc welding tooling proposed in the utility model includes an operating table, an argon filling strip and a pad, wherein the operating table is provided with a gas filling hole; the argon filling strip is installed on the top surface of the operating table, the argon filling strip forms an argon filling groove extending in the longitudinal direction, the opening of the argon filling groove faces upward to form a welding port, a first partition is arranged in the argon filling groove, the first partition divides the argon filling groove into a gas storage chamber located at the top and an air inlet chamber located at the bottom, a vent hole is opened on the first partition to connect the gas storage chamber with the air inlet chamber, and an air inlet hole connected with the gas filling hole is opened at the bottom of the argon filling strip; the air inlet hole is used to fill argon gas into the air inlet chamber; the number of the pads is two, the two pads are placed on the operating table and are respectively located on both sides of the argon filling strip in the horizontal direction, the top surfaces of the two pads respectively form two placement surfaces, each of the placement surfaces is in the same horizontal plane as the welding port, and the two pads are respectively used to place two pieces to be welded so that the two pieces to be welded are butted at the welding port.

[0006] Optionally, two second partitions are connected to the first partition, and the top end of each second partition is located in the same horizontal plane as the placement surface. The two second partitions are distributed along the lateral interval and divide the air storage chamber into a main air chamber located in the middle and two auxiliary air chambers located on both sides of the main air chamber. The air vent connects the air inlet chamber with the main air chamber; the top ends of the two second partitions divide the welding port into a main welding port and two auxiliary welding ports, and the two parts to be welded respectively block the two auxiliary welding ports, and the two parts to be welded are butt-jointed at the main welding port.

[0007] Optionally, the first baffle is horizontally arranged and extends in the longitudinal direction, two ends of the first baffle in the transverse direction are respectively connected to two side walls of the argon-filled strip, and each of the second baffles is vertically arranged.

[0008] Optionally, the number of the air inlet holes and the number of the air vent holes are both plural, and the multiple air inlet holes and the multiple air vent holes are arranged at intervals along the extension direction of the argon filling tank.

[0009] Optionally, the air inlet holes and the air vent holes are staggered in vertical distribution.

[0010] Optionally, the plasma arc welding tooling further comprises two counterweights, which are respectively arranged corresponding to the two pads, and each counterweight cooperates with the corresponding pad to clamp the workpiece to be welded up and down, so as to fix each workpiece to be welded on the corresponding placement surface.

[0011] Optionally, a slide rail for slidingly cooperating with an external welding device is installed on the top surface of each counterweight block, and the slide rail extends in the longitudinal direction.

[0012] Optionally, a gasket is arranged on the top of each of the backing plates, the top surface of the gasket forms the placement surface, and the material of the gasket is the same as that of the parts to be welded.

[0013] Optionally, the welding openings are formed at the tops of the two side walls of the argon-filling strip and respectively abut against the corresponding parts to be welded, and sealing strips are provided at the abutment points between the argon-filling strip and the parts to be welded.

[0014] Optionally, a plurality of vertically arranged legs are provided at the bottom of the operating table, the plurality of legs are arranged at intervals, and any two adjacent legs are connected by a crossbeam.

[0015] The plasma arc welding tooling proposed in the utility model provides an argon-filling strip and two pads on the operating table, and two parts to be welded are placed on two corresponding pads respectively, so that the two parts to be welded are butted and welded at the welding opening above the argon-filling slot, and argon is filled into the argon-filling slot formed by the argon-filling strip to provide protection for the welds of the two parts to be welded, thereby reducing the contact between the back of the weld and oxygen during front welding. The argon-filling slot is divided into an air inlet chamber and an air storage chamber by providing a first partition in the argon-filling strip, and the first partition acts as a buffer for the argon gas filled into the air inlet chamber. After the argon gas flow rate is reduced, it slowly diffuses into the air storage chamber through the vent hole, so that the argon gas is more evenly distributed in the air storage chamber. The argon gas provides efficient protection for the welds of the parts to be welded at the welding opening on the top of the air storage chamber, and the protection effect is good, thereby ensuring the forming quality of the weld of the plasma arc welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a schematic structural diagram of a plasma arc welding tool according to an embodiment of the utility model;

[0018] Figure 2 It is a side view structural schematic diagram of a plasma arc welding tooling according to an embodiment of the utility model;

[0019] Figure 3 The utility model is a schematic side view of the structure of an argon-filled rod in a plasma arc welding tooling according to an embodiment of the present invention.

[0020] Description of Figure Numbers:

[0021] Label name Label name 100 Tooling 212 Air intake chamber 10 Operation table 22 Welding mouth 11 Inflatable hole 23 First partition 12 Outriggers 231 Ventilation holes 13 beam 24 Second partition 20 Argon filling strip 25 Air Inlet 21 Argon filling tank 30 Pad 211 Gas storage chamber 40 Counterweight 211a Main air chamber 50 Gasket 211b Auxiliary air chamber 200 Parts to be welded

[0022] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0027] In the present invention, the descriptions of directions such as "up", "down", "front", "back", "left", and "right" are as follows: Figure 1 and Figure 2 The directions shown are for reference only and are used to explain the Figure 1 and Figure 2 The relative position relationship between the components in the shown posture. If the specific posture changes, the directional indication will also change accordingly.

[0028] The utility model provides a plasma arc welding tool, comprising an operating table 10, an argon filling strip 20 and a backing plate 30, wherein the operating table 10 is provided with a gas filling hole 11; the argon filling strip 20 is installed on the top surface of the operating table 10, the argon filling strip 20 forms an argon filling groove 21 extending in the longitudinal direction, the opening of the argon filling groove 21 faces upward to form a welding opening 22, a first partition 23 is arranged in the argon filling groove 21, the first partition 23 divides the argon filling groove 21 into a gas storage chamber 211 located at the top and an air inlet chamber 212 located at the bottom, and a gas storage chamber 211 and an air inlet chamber 212 are provided on the first partition 23. The bottom of the argon-filled strip 20 is provided with an air inlet 25 connected to the air filling hole 11; the air inlet 25 is used to fill argon gas into the air inlet chamber 212; there are two pads 30, both of which are placed on the operating table 10 and are respectively located on both sides of the argon-filled strip 20 in the horizontal direction, and the top surfaces of the two pads 30 form two placement surfaces respectively, each placement surface is in the same horizontal plane with the welding port 22, and the two pads 30 are respectively used to place two parts 200 to be welded so that the two parts 200 to be welded are butt-jointed at the welding port 22.

[0029] like Figure 1 As shown, Figure 1 The front-to-back direction is the longitudinal direction. Figure 1 The left and right directions in the text are horizontal. Figure 1 The up and down directions in the figure are vertical. The argon filling strip 20 forms a slot-shaped argon filling slot 21, which extends in the front-to-back direction. The first partition plate 23 divides the argon filling slot 21 into a gas storage chamber 211 and an air inlet chamber 212. The gas storage chamber 211 is connected to the welding port 22, and the air inlet chamber 212 is connected to the air inlet hole 25. The gas storage chamber 211 and the air inlet chamber 212 are connected through the air vent 231. The bottom of the argon filling strip 20 is placed on the top surface of the operating table 10, and the air inlet hole 25 at the bottom of the argon filling strip 20 is connected to the air filling hole 11 on the operating table 10, so that an external argon source can fill the air inlet chamber 212 with argon through the air filling hole 11 and the air inlet hole 25, and the argon in the air inlet chamber 212 diffuses into the gas storage chamber 211 through the air vent 231. The two pads 30 respectively place the two welded parts 200 in the same horizontal plane as the welding opening 22, so that the two welded parts 200 are horizontally butted at the welding opening 22. When the welding equipment welds the two welded parts 200 from above, the argon gas in the argon filling tank 21 can provide protection for the welds of the two welded parts 200 from below.

[0030] The plasma arc welding tool 100 proposed in the utility model is configured with an argon filling strip 20 and two pads 30 on an operating table 10, and two workpieces 200 to be welded are placed on two corresponding pads 30 respectively, so that the two workpieces 200 to be welded are butted at a welding opening 22 above an argon filling groove 21 and welded, and argon gas is filled into the argon filling groove 21 formed by the argon filling strip 20 to provide protection for the welds of the two workpieces 200 to be welded, thereby reducing the contact between the back of the weld and oxygen when welding from the front. By setting a first partition 23 in the argon filling strip 20, the argon filling tank 21 is divided into an air inlet chamber 212 and a gas storage chamber 211. The first partition 23 acts as a buffer for the argon gas filled into the air inlet chamber 212. After the argon flow rate is reduced, it slowly diffuses into the gas storage chamber 211 through the vent 231, so that the argon gas is more evenly distributed in the gas storage chamber 211. The argon gas provides efficient protection for the weld of the workpiece 200 to be welded at the welding port 22 at the top of the gas storage chamber 211, and the protection effect is good, thereby ensuring the forming quality of the weld of the plasma arc welding.

[0031] In one embodiment, two second partitions 24 are connected to the first partition 23, and the top end of each second partition 24 is located in the same horizontal plane as the placement surface. The two second partitions 24 are distributed along the lateral interval and divide the air storage chamber 211 into a main air chamber 211a located in the middle and two auxiliary air chambers 211b located on both sides of the main air chamber 211a. The vent 231 connects the air inlet chamber 212 with the main air chamber 211a; the top ends of the two second partitions 24 divide the welding port 22 into a main welding port 22 and two auxiliary welding ports 22, and the two parts 200 to be welded respectively block the two auxiliary welding ports 22, and the two parts 200 to be welded are butt-jointed at the main welding port 22.

[0032] like Figure 3 As shown, the two second partitions 24 divide the gas storage chamber 211 into a main gas chamber 211a and two auxiliary gas chambers 211b, and correspondingly divide the welding port 22 into a main welding port 22 and two auxiliary welding ports 22. When the two parts 200 to be welded are placed on the two backing plates 30 respectively, the two parts 200 to be welded respectively block the two auxiliary welding ports 22. The argon gas in the gas inlet chamber 212 diffuses into the main gas chamber 211a through the vent 231, and the main welding port 22 at the top of the main gas chamber 211a provides protection for the welds of the two parts 200 to be welded. The two auxiliary gas chambers 211b can collect the argon gas overflowing from the main gas chamber 211a and provide secondary protection for the welds, effectively preventing the argon gas from overflowing, and further improving the protection quality of the argon gas on the welds.

[0033] In one embodiment, the first baffle 23 is horizontally disposed and extends longitudinally, and both ends of the first baffle 23 in the transverse direction are respectively connected to two side walls of the argon-filled strip 20 , and each second baffle 24 is vertically disposed.

[0034] like Figure 1 and Figure 3 As shown, the top surface of the operating table 10 is arranged horizontally, the bottom of the argon filling strip 20 is in contact with the top surface of the operating table 10, the two side walls of the argon filling strip 20 are arranged vertically and at the same height, the two second partitions 24 are also arranged vertically, and the top of each second partition 24 and the top of the side wall of the argon filling strip 20 are both located in the horizontal plane where the welding opening 22 is located. When two parts 200 to be welded are placed on two pads 30 respectively, the two parts 200 to be welded are at the same height, so that the two parts 200 to be welded are horizontally butted at the welding opening 22, ensuring that the two parts 200 to be welded are butted flatly and the forming quality of the weld is good.

[0035] In one embodiment, the number of the air inlet holes 25 and the number of the air vent holes 231 are both plural, and the plurality of air inlet holes 25 and the plurality of air vent holes 231 are disposed at intervals along the extending direction of the argon filling tank 21 .

[0036] It can be understood that by increasing the number of air inlet holes 25 and air vents 231, and arranging the air inlet holes 25 and air vents 231 at intervals in the extension direction of the argon filling tank 21, it can be further ensured that the argon gas is evenly distributed in the entire argon filling tank 21, which helps to provide a consistent argon gas environment in the argon filling tank 21 and ensure the quality of weld formation.

[0037] In one embodiment, the air inlet holes 25 and the air vent holes 231 are staggered in the vertical direction.

[0038] Furthermore, since the air inlet holes 25 and the air vents 231 are arranged at intervals along the longitudinal direction and the air inlet holes 25 and the air vents 231 are staggered in the vertical direction, the argon gas filled in from the air inlet holes 25 can be fully buffered in the air inlet chamber 212 without directly entering the gas storage chamber 211. The flow rate of the argon gas is reduced by the first baffle 23 and then diffused into the gas storage chamber 211, thereby ensuring that the argon gas is evenly distributed in the gas storage chamber 211 and the air in the gas storage chamber 211 is fully discharged, so that the argon gas provides efficient protection to the back side of the weld and ensures the quality of weld formation.

[0039] In one embodiment, the plasma arc welding tool 100 also includes two counterweights 40, which are respectively arranged corresponding to the two pads 30, and each counterweight 40 cooperates with the corresponding pad 30 to clamp the welded parts 200 up and down to fix each welded part 200 on the corresponding placement surface.

[0040] like Figure 2 As shown, when the workpiece 200 to be welded is placed on the pad 30, the counterweight block 40 is pressed above the workpiece 200 to be welded, and the counterweight block 40 cooperates with the pad 30 to clamp and fix the workpiece 200 to be welded, so that the two workpieces 200 to be welded are welded at the welding port 22, preventing the workpiece 200 to be welded from moving during the welding process, thereby ensuring the quality of the weld formation.

[0041] In one embodiment, a slide rail for slidingly cooperating with an external welding device is installed on the top surface of each counterweight block 40, and the slide rail extends in the longitudinal direction.

[0042] like Figure 1 As shown, the counterweight block 40 also extends in the longitudinal direction, and the length of the counterweight block 40 in the longitudinal direction is the same as the length of the pad 30 in the longitudinal direction. The top surface of the counterweight block 40 is installed with a longitudinally extending slide rail, so that when the two counterweight blocks 40 are respectively pressed above the two parts to be welded 200, the weld formed by the two parts to be welded 200 is located between the two slide rails and remains parallel to the slide rails. The external welding equipment can move in the longitudinal direction by sliding with the two slide rails, so as to quickly adjust the position for welding. It should be noted that the distance between the slide rail on the counterweight block 40 and the weld of the two parts to be welded 200 is less than the range in which the external welding equipment can move in the lateral direction, ensuring that the external welding equipment can adjust its position in the lateral direction by itself to achieve a better welding effect.

[0043] In one embodiment, a gasket 50 is disposed on the top of each backing plate 30 , and the top surface of the gasket 50 forms a placement surface. The material of the gasket 50 is the same as that of the component 200 to be welded.

[0044] It can be explained that the provision of the gasket 50 ensures that the workpiece 200 to be welded obtains uniform support on the placement surface, prevents deformation or instability of the workpiece during welding, and ensures the welding quality; at the same time, the gasket 50 separates the pad 30 from the workpiece 200 to be welded, and the material of the gasket 50 is the same as that of the workpiece 200 to be welded, thereby avoiding direct contact between the pad 30 and the workpiece 200 to be welded and causing contamination.

[0045] In one embodiment, welding openings 22 are formed at the tops of two side walls of the argon filling strip 20 and respectively abut against corresponding parts to be welded 200 , and sealing strips are provided at the abutting points between the argon filling strip 20 and the parts to be welded 200 .

[0046] It is understandable that the provision of the sealing strip can effectively seal the abutment between the argon filling strip 20 and the workpiece 200 to be welded, prevent oxygen from entering the argon filling tank 21, reduce the possibility of weld oxidation, and thus improve welding quality. In addition, the sealing strip prevents the leakage of argon in the argon filling tank 21, helps to reduce the waste of argon, improve the utilization rate of argon, and thus reduce welding costs.

[0047] In one embodiment, a plurality of vertically arranged supporting legs 12 are disposed at the bottom of the operating platform 10 . The plurality of supporting legs 12 are arranged at intervals, and any two adjacent supporting legs 12 are connected by a cross beam 13 .

[0048] It can be explained that the multiple legs 12 provide multi-point support for the operating table 10, effectively improving the stability of the operating table 10, and can distribute the weight on the operating table 10 to each leg 12, preventing the single point at the bottom of the operating table 10 from being overstressed, thereby extending the service life of the operating table 10. A crossbeam 13 is provided between any two adjacent legs 12, and the multiple crossbeams 13 connect the multiple legs 12 to form a stable frame structure, so that the operating table 10 can bear a larger weight, effectively improving the bearing capacity of the operating table 10.

[0049] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A plasma arc welding tool, characterized in that: include: An operating table, wherein an inflation hole is provided on the operating table; An argon filling strip, the argon filling strip is installed on the top surface of the operating table, the argon filling strip forms an argon filling groove extending in the longitudinal direction, the opening of the argon filling groove faces upward to form a welding opening, a first partition is arranged in the argon filling groove, the first partition divides the argon filling groove into an air storage chamber located at the top and an air inlet chamber located at the bottom, an air vent connecting the air storage chamber with the air inlet chamber is arranged on the first partition, and an air inlet hole connected with the air filling hole is arranged on the bottom of the argon filling strip; the air inlet hole is used to fill argon gas into the air inlet chamber; Pads, there are two pads, both of which are placed on the operating table and are respectively located on both sides of the argon filling strip in the horizontal direction, the top surfaces of the two pads respectively form two placement surfaces, each of the placement surfaces is in the same horizontal plane with the welding port, and the two pads are respectively used to place two parts to be welded so that the two parts to be welded are butt-jointed at the welding port.

2. The plasma arc welding tool as claimed in claim 1, characterized in that: Two second partitions are connected to the first partition, and the top end of each second partition is located in the same horizontal plane as the placement surface. The two second partitions are spaced apart laterally and divide the air storage chamber into a main air chamber located in the middle and two auxiliary air chambers located on both sides of the main air chamber. The air vent connects the air inlet chamber with the main air chamber. The top ends of the two second partitions divide the welding port into a main welding port and two auxiliary welding ports. The two parts to be welded respectively block the two auxiliary welding ports, and the two parts to be welded are butt-jointed at the main welding port.

3. The plasma arc welding tool as claimed in claim 2, characterized in that: The first baffle is horizontally arranged and extends in the longitudinal direction. Both ends of the first baffle in the transverse direction are respectively connected to the two side walls of the argon-filled strip, and each of the second baffles is vertically arranged.

4. The plasma arc welding tool as claimed in claim 1, characterized in that: The number of the air inlet holes and the number of the air vent holes are both multiple, and the multiple air inlet holes and the multiple air vent holes are arranged at intervals along the extension direction of the argon filling tank.

5. The plasma arc welding tool as claimed in claim 4, characterized in that: The air inlet holes and the air vent holes are staggered in vertical distribution.

6. The plasma arc welding tool as claimed in any one of claims 1 to 5, characterized in that: The plasma arc welding tooling also includes two counterweights, which are respectively arranged corresponding to the two pads, and each counterweight cooperates with the corresponding pad to clamp the parts to be welded up and down, so as to fix each part to be welded on the corresponding placement surface.

7. The plasma arc welding tool as claimed in claim 6, characterized in that: A slide rail for slidingly cooperating with external welding equipment is installed on the top surface of each counterweight block, and the slide rail extends in the longitudinal direction.

8. The plasma arc welding tool as claimed in any one of claims 1 to 5, characterized in that: A gasket is arranged on the top of each of the pads, the top surface of the gasket forms the placement surface, and the material of the gasket is the same as that of the parts to be welded.

9. The plasma arc welding tool as claimed in any one of claims 1 to 5, characterized in that: The tops of the two side walls of the argon filling strip form the welding openings and respectively abut against the corresponding parts to be welded, and a sealing strip is provided at the abutment between the argon filling strip and the parts to be welded.

10. The plasma arc welding tool as claimed in any one of claims 1 to 5, characterized in that: A plurality of vertically arranged legs are arranged at the bottom of the operating table. The plurality of legs are arranged at intervals, and any two adjacent legs are connected by a crossbeam.

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