JP5204745B2 - BACKING DEVICE AND WELDING METHOD - Google Patents

Description

  The present invention relates to a backing device and a welding method for pressing a backing member against the back surface of a weld groove portion when performing single-sided automatic welding along a weld groove portion of a temporarily welded steel plate. It is.

  Generally, steel plates used in ships and the like are formed by joining steel plates of a certain size by welding because they require a large steel plate area. The single-sided welding device used in the above-described steel plate welding operation includes a backing device that presses the backing member from the back surface of the steel plate along the weld groove portion of the temporarily welded steel plate.

  For example, a single-side welding device described in Patent Document 1 includes a flux backing type first backing device and a flux copper backing type second backing device that presses a flux against the back side of a weld groove where a steel plate to be welded is abutted. And a horizontally movable first frame on which the first backing device and the second backing device are mounted, and a second frame disposed immediately below the first frame. The second frame includes a first flux collecting unit that collects the flux dropped from the first backing device and a second flux collecting unit that collects the flux dropped from the second backing device. The single-sided welding device includes a flux supply device that can move along the longitudinal direction of the first backing device and the second backing device.

  The first backing device includes a bowl-shaped flux container that holds the flux, and two first air hoses that raise and lower the flux container relative to the first frame. The second backing device includes a copper plate that holds the flux and two second air hoses that raise and lower the copper plate relative to the first frame.

  The single-sided welding apparatus having such a configuration uses a position adjusting device provided between the first frame and the second frame to move the first frame on the second frame, thereby Position adjustment of this apparatus or a 2nd backing apparatus is performed, and a 1st backing apparatus or a 2nd backing apparatus is arrange | positioned directly under a welding groove part. And a flux supply apparatus is moved to a longitudinal direction and a flux is supplied on a flux container or a copper plate. After that, by introducing air into the first air hose or the second air hose and inflating it, the flux container or the copper plate is pressed against the weld groove, and the flux is pressed against the back side of the weld groove. Weld with a welding machine from the front side of the part.

  For example, in the single-sided welding apparatus described in Patent Document 2, welding is performed while pressing a backing flux against the back surface of the steel plate to be welded in order to form a weld bead on the back surface. The backing flux is conveyed and supplied by a conveying device. As the conveying device, for example, a trough belt that progresses while deforming a flat plate into a semicircular shape, a pair of pulleys that are provided at both ends of the trough belt, and the trough belt is stacked, a trough belt And a vertical roller that supports both ends in the width direction are known.

  When the trough belt of the conveying device (belt conveyor) described in Patent Document 2 is sent to the lower part of the steel plate to be welded, the protrusions formed at both ends of the trough belt are interposed between the pair of flanges of the vertical roller. It is supported by being inserted. In a single-sided welding device, a compressed body or a fluid placed in the lower part of the trough belt is filled with compressed air or fluid to expand it, and the trough belt is pushed upward, whereby the upper layer flux is a weld groove that is a joining portion of the material to be welded. One-sided automatic welding is performed using the conveying device as a backing device.

  After welding is completed, the trough belt is rotated, and the flux used for welding is dropped onto a sieving device arranged near the conveyor end, thereby separating the solidified flux from the unused flux and collecting the unused flux. It is like that.

JP 2005-319512 A Japanese Utility Model Publication No. 49-8919

However, the conventional single-side welding apparatus has the following problems.
In the single-sided welding device described in Patent Document 1, the second backing device (the backing member in the present invention) constituting the single-sided welding device is held in a state where a long copper plate is fixed to the upper portion of the backing device. Therefore, if there is bending in the vertical direction due to bending deformation of the welded steel plate that was before welding or thermal strain in the welding process, the backing device has insufficient adhesion to the bottom surface of the welded steel plate, If the back bead is bad or worse, a serious defect called melting has occurred.

In addition, when the copper plate is fixed to the upper portion of the backing device, the copper plate expands due to heat during welding, so that a “buckling” state occurs in the copper plate. As a result, the gap between the copper plate and the steel plate to be welded is uneven, the adhesion to the back surface of the steel plate to be welded is insufficient, and the back bead is poor.
Therefore, the conventional single-side welding apparatus has a problem that a favorable back-surface welded part shape cannot be obtained.

  In the single-side welding apparatus described in Patent Document 2, in the backing apparatus, a flat trough belt is formed in a “U” shape between a pair of pulleys and is movably supported so as to be movable. Need to be placed. Such a backing device has a problem that the structure for supporting the trough belt with the vertical roller is complicated, and the trough belt is easily damaged.

If the vertical roller breaks down, the trough belt cannot maintain its normal shape. As a result, the gap between the trough belt and the steel plate to be welded varies, and the state of contact of the backing flux to the back surface of the steel plate to be welded by the trough belt also varies. The pressing force to be pressed was weakened, and the backing flux sometimes did not press firmly against the back of the weld groove.
As a result, the conventional backing device has a problem that a good weld back bead shape cannot be obtained.

  For this reason, instead of the conveying device comprising the belt conveyor that supports the trough belt with the above-described vertical roller, the flux can be pressed against the back surface of the weld groove portion of the steel plate to be welded with an appropriate pressing force in a stable state. There has been a demand for a backing device having a backing member.

  The present invention has been devised in view of the above-mentioned problems, and its object is to provide a backing device and a welding method capable of obtaining a good back-surface welded part shape when performing single-sided automatic welding. .

In order to solve the above-described problem, the backing device according to claim 1 is a backing device that is used in a single-side welding device for connecting steel plates to be welded and performs welding using a flux, The entire length of the backing device includes a first backing member and a second backing member that are not less than the weld groove portion of the steel plate to be welded and have a minimum length, and the first backing member and the second backing member. Either one of the members is disposed immediately below the weld groove portion, and the first copper backing member is disposed along the weld groove portion and on which the flux is placed. And a supporting frame that slidably supports the backing copper plate in the direction of the weld groove, the backing copper plate being a plurality of copper plate pieces having a predetermined length connected by a connecting member, A trough frame in which a second backing member is disposed along the weld groove. And a trough that is fixed to the trough frame and stores the flux, and the connection member includes a connection fitting for placing the copper plate piece at a position of the adjacent copper plate piece, and a copper plate piece placed on the connection fitting. And a connecting pin that is inserted and connected to a through hole formed in advance, and the connecting metal fitting has a lower surface formed with a convex portion that can slide along the support frame, and the trough, It is interposed between the trough frame that fixes the trough, expands with compressed air, and presses the flux against the lower surface of the weld groove of the steel plate to be welded. The above-mentioned trough and the trough are fixed. Wherein each of the air hose interposed between the rough frame is placed two air hoses with different cross-sectional dimensions in the vertical,
An elevating device for raising and lowering the trough frame is provided, and an air hose is provided between the trough frame and a second support structure on the elevating device, and the second backing member is raised by the elevating device. When raised to the end, the gap between the second backing member and the steel plate to be welded is not more than 75% of the diameter of the air hose at the maximum expansion, and the air pressure of the air hose is zero. The range is from 0.05 to 0.5 MPa .

  According to such a configuration, the first backing member has a length equal to or longer than the weld groove portion, the backing copper plate connecting the plurality of copper plate pieces, and the support frame that slidably supports the backing copper plate. Therefore, when the backing copper plate is pressed against the welded steel plate, even if there is bending deformation of the welded steel plate or the backing copper plate expands during the welding process, the backing copper plate bends up and down, There is no variation in the gap between the copper plate and the welded steel plate. Further, since the backing copper plate is slidable without being fixed to the upper part of the backing member, the backing copper plate is held in a normal backing position during welding and easily expands, and the backing copper plate does not buckle. It does not occur, and there is no variation in the gap between the backing copper plate and the welded steel plate. As a result, the close contact state of the flux to the back side of the weld groove, that is, the backing flux is improved.

Further, the second backing member has a length equal to or longer than the weld groove portion, and the second backing member is formed of a simple shape, a material trough and a flux arranged along the weld groove portion. A sufficient amount of flux is supplied over the entire length of the weld groove. In the backing device, the second backing member has a trough frame disposed along the welding groove portion, a trough fixed to the trough frame, and a flux accommodated in the trough. As a result, both ends in the width direction of the trough can be firmly supported by the trough frame, so that there is no variation in the gap between the trough and the steel plate to be welded. As a result, the flux is pressed against the back surface of the welded steel sheet by appropriately pressing the welded steel sheet with the trough and the flux in the trough.
In addition, since the connecting member includes the connecting metal fitting and the connecting pin, and the convex portion is formed on the lower surface of the connecting metal fitting, it is easy to slide the connected copper plate pieces in the direction of the weld groove. As a result, the backing copper plate is not bent by the expansion of the copper plate piece during welding, and the adhesion state of the backing flux to the back surface of the weld groove is further improved.
Moreover, the adjustment of the clearance between the trough and the welded steel sheet is facilitated by providing an air hose that expands with compressed air and presses the flux against the lower surface of the weld groove portion of the welded steel sheet. In addition, since the expansion by the compressed air is used, the pressing force of the backing flux can be easily adjusted by adjusting the air pressure in the air hose. An air hose that expands with compressed air and presses the flux against the lower surface of the weld groove of the steel plate to be welded, and an air hose that pushes up the used flux from the trough after welding, are provided in the trough suitable for each function. The flux can be pushed up, and a series of single-sided welding can be obtained properly.
Further, when the gap between the trough and the steel plate to be welded is within a predetermined range and the air pressure of the air hose is within the predetermined range, the pressing state of the flux to the steel plate to be welded can be adjusted.

The backing device according to claim 2 , wherein the support frame has a plurality of rails arranged on a back side of the backing copper plate along a longitudinal direction of the backing copper plate, and a support plate that supports the rail. It is characterized by providing.

  According to such a configuration, since the support frame includes the rail and the support plate, the sliding of the backing copper plate in the direction of the weld groove is further facilitated. As a result, the contact state of the backing flux to the back surface of the weld groove is further improved.

The backing device according to claim 3 is a flux that is interposed between the support frame and a first support structure portion that supports the support frame, expands by compressed air, and is placed on the backing copper plate. And an air hose that presses against the back surface of the weld groove portion of the welded steel sheet.

  According to this configuration, the adjustment of the gap between the backing copper plate and the steel plate to be welded can be achieved by providing the air hose that presses the backing flux that is expanded by the compressed air and placed on the backing copper plate against the back surface of the welding groove. It becomes easy. In addition, since the expansion by the compressed air is used, the pressing force can be easily adjusted by adjusting the air pressure in the air hose. As a result, the contact state of the backing flux to the back surface of the weld groove is further improved.

The backing device according to claim 4 includes an elevating device that raises and lowers the first support structure, and when the first backing member is raised to the ascending end of the backing copper plate by the elevating device, The gap between the first backing member and the steel plate to be welded is 75% or less of the maximum expanded diameter of the air hose, and the air pressure of the air hose is in the range of 0.05 to 0.5 MPa. It is characterized by that.

  According to such a configuration, by providing the lifting device that raises and lowers the first support structure, even if the steel plate to be welded exists above the backing device, the backing copper plate can be lowered. A space that can spread the flux on the upper surface can be secured. In addition, after spraying the backing flux, the lifting device is raised so that the clearance between the backing copper plate and the welded steel plate is within a predetermined range and the air pressure of the air hose is within the predetermined range. The pressing of the backing flux placed on the copper plate to the steel plate to be welded becomes good, and the contact state of the backing flux to the back surface of the weld groove becomes even better.

Backing device according to claim 5, wherein the trough has a length of aperture width perpendicular to the longitudinal direction, which characterized by a range of 50 to 200 mm.

  According to this configuration, the trough is supplied with a sufficient amount of flux over the entire length of the weld groove by setting the length of the opening width orthogonal to the longitudinal direction to a length of 50 to 200 mm. It becomes like this.

The backing device according to claim 6 , wherein the flux is laminated with a backing flux that presses against the steel plate to be welded and an underlay flux layer that is laid under the backing flux layer in the trough. It is characterized by that.

  According to such a configuration, the flux is a backing flux when welding is performed by laminating the backing flux pressed against the steel plate to be welded and the layer of the underlying flux placed under this in the trough. The amount of use can be reduced.

The backing device according to claim 7 includes an elevating device that raises and lowers the trough frame, and an air hose is provided between the trough frame and a second support structure on the elevating device, The first air hose arranged between the trough and the upper part of the trough frame, and the first air hose arranged vertically with the first air hose between the trough and the upper part of the trough frame. A second air hose having a smaller diameter than one air hose, and a third air hose disposed between the trough frame and a second support structure on the lifting device, the first air hose, the second air hose, and the The third air hose is characterized in that the internal pressure is individually controlled by a pressurizing device that puts compressed air into each.

  According to such a configuration, the first air hose, the second air hose, and the third air hose are individually controlled in internal pressure by the pressurizing device that puts compressed air into each, and the compressed air of the set pressure is sent into each. Expands.

The backing device according to claim 8 is disposed on the lifting frame, the lifting frame disposed immediately below the first supporting structure portion supporting the supporting frame and the second supporting structure portion supporting the trough frame. And one flux collecting means for collecting the flux dropped from the first backing member and the second backing member.

  According to such a configuration, when the flux is scraped off after welding of the weld groove portion, the flux is recovered.

The backing device according to claim 9 is disposed in the lifting frame, the lifting frame disposed immediately below the first supporting structure portion supporting the supporting frame and the second supporting structure portion supporting the trough frame. A first flux collecting means for collecting the flux dropped from the first backing member; and a second flux collecting means arranged on the elevating frame for collecting the flux dropped from the second backing member. It is characterized by.

  According to such a configuration, when the flux is scraped off after welding of the welding groove portion, the flux dropped from the first backing member and the flux dropped from the second backing member are not mixed, respectively. Collected individually.

The backing device according to claim 10 includes a connecting portion that connects the first support structure portion that supports the support frame and the second support structure portion that supports the trough frame.

  According to such a configuration, the rigidity in the width direction of the first support structure portion and the second support structure portion is increased by including the connecting portion that connects the first support structure portion and the second support structure portion, When the backing device is aligned with the positions of both ends of the weld groove, the first support structure and the second support structure are prevented from being deformed like a bow. Further, in the connecting portion, the used flux dropped from the first backing member and the second backing member accumulates between the first backing member and the second backing member, and does not reach the flux collecting means. In order to prevent this, a space having a predetermined interval can be provided between the first backing member and the second backing member.

The welding method according to claim 11 , wherein the steel plate to be welded is moved and arranged at a corresponding position where the backing device according to the above is installed, and the backing device along the weld groove portion of the steel plate to be welded. A welding method in which the first backing member is pressed to perform a welding operation, wherein the backing device is configured such that the connecting member in the backing copper plate of the first backing member is located at the position of the adjacent copper plate piece. A connecting metal fitting for placing the copper plate piece, and a connecting pin for connecting the connecting metal piece and the placed copper plate piece through a through-hole formed in advance; A convex portion that is slidable along the support frame is formed, and the backing device is interposed between the trough of the second backing member of the backing device and the trough frame that fixes the trough. The welded steel sheet is expanded by compressed air A large-diameter air hose that presses against the lower surface of the weld groove, and a small-diameter air hose that expands with compressed air and pushes up the used flux. Each of the air hoses interposed between the trough and the trough frame that fixes the trough has two air hoses with different cross-sectional dimensions arranged vertically, toward the weld groove portion of the steel plate to be welded. A first step of raising a backing copper plate having a minimum length not less than the weld groove by a lifting device, a supporting frame for supporting the backing copper plate raised by the lifting device, and supporting the supporting frame The flux hung on the surface of the backing copper plate is expanded by injecting compressed air into an air hose provided between the first support structures. A second step of pressing the back surface of serial welding groove portion, characterized in that it comprises a third step of performing one-side welded by welding machine of the one-side welding apparatus.

  According to this procedure, the first step of raising the backing copper plate by the lifting device and the backing flux placed on the backing copper plate and the backing copper plate by inflating the air hose on the back surface of the weld groove portion. By including the 2nd process to press, the contact | adherence state of the backing flux to the back side of a welding groove part becomes a favorable thing.

The welding method according to claim 12 , wherein the welded steel plate is moved to a corresponding position where the backing device described above is installed, and the backing device is arranged along a weld groove portion of the welded steel plate. A welding method in which the second backing member is pressed to perform a welding operation, wherein the backing device is configured such that the connecting member in the backing copper plate of the first backing member is adjacent to the position of the adjacent copper plate piece. And a connecting pin for connecting the connecting fitting and the placed copper plate piece through a previously formed through hole, and the connecting fitting is provided on the lower surface of the connecting fitting. A projecting portion that is slidable along the support frame, and the backing device is interposed between the trough of the second backing member of the backing device and the trough frame that fixes the trough. And the flux is expanded by compressed air. A large-diameter air hose that presses against the lower surface of the weld groove, and a small-diameter air hose that expands with compressed air and pushes up the used flux. Each of the air hoses interposed between the trough and the trough frame that fixes the trough has two air hoses with different cross-sectional dimensions arranged vertically, toward the weld groove portion of the steel plate to be welded. A first step of raising the trough and trough frame having a minimum length not less than the weld groove by a lifting device, and a second backing member raised by the lifting device on the trough frame and the lifting device The trough is expanded by injecting compressed air into a third air hose disposed between the second support structure and the weld groove. A second step of approaching or pressing the back surface of the trough and the trough and the first air hose arranged between the trough and the trough frame to inflate compressed air to expand the flux in the trough And a fourth step of performing single-sided welding with a welding machine of the single-side welding apparatus.

  According to this procedure, the trough is lifted by the lifting device in the first step, the third air hose is expanded in the second step to bring the trough close to or pressed against the back surface of the weld groove portion, and the third step in the third step. By including expanding the 1 air hose and pressing the flux in the trough, the pressed state of the flux to the welded steel sheet becomes good.

The welding method according to claim 13 , wherein after the one-side welding in the fourth step is finished, the first air hose and the third air hose are contracted and the lifting device is lowered, and then the trough and the trough frame The method includes a step of inflating the compressed air by injecting compressed air into a second air hose arranged between the upper portion and the upper portion of the trough to push up the flux in the trough.

  According to such a procedure, the used backing flux in the trough can be selectively pushed out of the trough and scraped off by the flux collecting carriage in the next process to selectively eliminate the used backing flux. The economic effect can be obtained that can suppress the excess consumption.

The backing device and the welding method according to the present invention have the following excellent effects.
The invention of claim 1 is characterized in that the first backing member has a length equal to or longer than the weld groove, a backing copper plate in which a plurality of copper plate pieces are connected, and a support frame that slidably supports the backing copper plate. By comprising, when performing single-sided automatic welding, a favorable back surface welded part shape can be obtained.
In addition, a good weld shape can be obtained when single-side welding is performed by pressing a sufficient amount of flux over the entire length of the weld groove, particularly in the vicinity of the weld start end and the weld end.
Furthermore, the backing device can suppress variation in the gap between the copper plate or trough and the welded steel plate. When a trough is used as the backing member, the trough and the flux in the trough are appropriately pressed against the steel plate to be welded, and the flux can always be brought into close contact with the steel plate to be welded with an appropriate pressing force. The occurrence of poor welding can be suppressed. Further, by providing two backing members, different backing methods can be used properly based on the shape and specifications of the welded steel sheet.
Moreover, when a connection member is provided with the connection metal fitting by which the convex part was formed in the lower surface, and the connection pin, when performing single-sided automatic welding, a further favorable back surface weld part shape can be obtained.
Moreover, by providing the air hose, the adjustment of the gap between the trough and the steel plate to be welded can be facilitated, and since the expansion by the compressed air is used, the adjustment of the air pressure in the air hose can be facilitated. it can. And the air hose interposed between the trough and the trough frame that fixes the trough is arranged with two air hoses with different cross-sectional dimensions above and below, so that the backing flux The first air hose that presses against the back surface and the second air hose that pushes up the used flux by the trough after welding are provided one above the other so that the flux in the trough suitable for each function can be pushed up. can get.
Moreover, the raising operation | movement of a trough can be made easy by providing the raising / lowering apparatus. Moreover, the contact | adherence state and supply state of the flux to a to-be-welded steel plate can be made favorable by making the clearance gap between a trough and a to-be-welded steel plate and the air pressure between them into a predetermined range. As a result, it is possible to suppress the occurrence of poor welding due to poor adhesion of the flux and obtain a good weld shape.

A second aspect of the present invention, by supporting lifting frame comprises a rail and the supporting plate, can be in making one side automatic welding, obtaining a better backside weld shape.

The invention according to claim 3, by that it comprises a hose, it is possible to facilitate the clearance adjustment of the backing copper plate and steel plates to be welded, for using inflatable with compressed air, the air pressure in the air hose The adjustment can be facilitated.

A fourth aspect of the present invention, by that it comprises a lifting device, it is possible to easily increase the work of backing copper plate. Further, the gap between the backing copper plate and steel plates to be welded, by within a predetermined range and between the air pressure, it is possible to improve the contact state and supply state to steel plates to be welded of the flux. As a result, it is possible to suppress the occurrence of poor welding due to poor adhesion of the flux and obtain a good weld shape.

In the invention of claim 5 , by setting the trough opening width to 50 to 200 mm, a sufficient amount of flux can be supplied with respect to the width of the entire weld groove portion, so that the entire welded portion can be provided. Can be welded well.

In the invention of claim 6 , the flux is laminated in the trough with the backing flux and the layer of the underlay flux. When welding is performed, the underlay flux is used during the welding operation. The amount of backing flux used can be reduced and welding can be performed economically.

According to a seventh aspect of the present invention, there is provided a third air hose and a second air hose arranged between the trough and the upper part of the trough frame, and a third air hose arranged between the trough frame and the second support structure on the lifting device. Each of the first air hose, the second air hose, and the third air hose is individually controlled by a pressurizing device that puts compressed air, thereby individually controlling each internal pressure. it can. For this reason, since the 1st air hose, the 2nd air hose, and the 3rd air hose are each supplied with the compressed air of the preset pressure, each can be expanded to a desired size necessary for raising the flux and the like. .

The invention according to claim 8 can collect the used flux that has dropped from the first backing member and the second backing member.

According to the ninth aspect of the present invention, the used flux dropped from the first backing member and the second backing member can be separately separated and recovered.

The invention of claim 10 can prevent the first support structure portion and the second support structure portion from being deformed like a bow at the positions of both ends of the groove line, and can improve the accuracy of centering of the welding machine. it can. In addition, since the connecting portion has a function of providing a predetermined interval (space portion) between the first backing member and the second backing member, the used flux can be dropped from the space portion, It can be prevented that used flux that has dropped from the first backing member and the second backing member accumulates between the first backing member and the second backing member and does not reach the flux collecting means. .

The invention of claim 11 includes a first step of raising the backing copper plate and a second step of pressing the backing flux placed on the backing copper plate against the back surface of the weld groove by expanding the air hose. By including, when performing single-sided welding, a favorable back surface welded part shape can be obtained.

The invention of claim 12 includes a first step of raising the trough with a lifting device, a second step of inflating the third air hose to bring the trough close to or against the back surface of the weld groove, and a first air hose. By including the third step of inflating and pressing the flux in the trough, even if the amount of flux in the trough is slightly different from the appropriate amount, the pressing state of the flux to the welded steel sheet It is possible to eliminate welding defects.

In the invention of claim 13 , the used backing flux in the trough can be selectively pushed out of the trough and scraped by the flux collecting carriage in the next process to selectively eliminate the used backing flux. An economic effect can be obtained that can suppress excessive consumption of flux.

It is sectional drawing which shows the structure of the backing device which concerns on this invention, and a single-sided welding apparatus (a welding machine is not shown in figure). It is a perspective view of the 1st backing member in the backing device concerning the present invention. It is a disassembled perspective view which shows the structure of the 1st backing member in the backing device which concerns on this invention. The structure of the 1st backing member in the backing device which concerns on this invention is shown, (a) is a top view, (b) is a front view. The raising / lowering state of the 1st backing member of the backing device which concerns on this invention is shown, (a) is the schematic which shows the state before pressing a backing copper plate to a to-be-welded steel plate, (b) is covering a backing copper plate. It is the schematic which shows the state pressed on the welded steel plate. It is a perspective view of the 2nd backing member in the backing device concerning the present invention. The raising / lowering state of the 2nd backing member of the backing device which concerns on this invention is shown, (a) is the schematic which shows the installation state of a 1st air hose and a 2nd air hose, (b) presses a flux against a to-be-welded steel plate. It is the schematic which shows the previous state. It is the schematic which shows the raising / lowering state of the 2nd backing member of the backing device which concerns on this invention, and shows the state which pressed the flux against the to-be-welded steel plate. It is the schematic which shows the raising / lowering state of the 2nd backing member of the backing device which concerns on this invention, and shows a state when collect | recovering used backing flux. It is sectional drawing which shows the structure which provided two flux collection | recovery means in the backing apparatus and single-sided welding apparatus (a welding machine is not shown) which concerns on this invention. It is a perspective view (a steel plate to be welded is not shown) which shows composition of a single side welding device in which a backing device concerning the present invention was installed. It is sectional drawing of FIG. It is sectional drawing which shows the structure of other embodiment of the backing device which concerns on this invention, and a single-sided welding apparatus (a welding machine is not shown in figure).

<Backing device>
An embodiment of a backing device according to the present invention will be described in detail with reference to the drawings. In the description of the embodiments, the longitudinal direction is a direction parallel to the weld groove portion of the steel plate to be welded, and the width direction is perpendicular to the weld groove portion and is the direction of the backing steel plate plane.

  As shown in FIG. 1, a backing device 10 of the present invention is used in a single-side welding device 1 for connecting steel plates to be welded E and E each having a length of 10 to 30 m, for example, flux, That is, it is an apparatus that performs welding (for example, single-sided submerged arc welding) using a backing flux.

The backing device 10 of the present invention has a first backing member 11a and a second backing member 11b. One of the first backing member 11a and the second backing member 11b is disposed immediately below the welding groove portion M, and the first backing member 11a or the second backing member 11b is selected. When the plate thickness of the steel plate E to be welded is relatively thick and there is no mistake, the first backing member 11a is used, the plate thickness of the steel plate E to be welded is relatively thin, and there is a mistake or a plate thickness difference. In this case, the second backing member 11b is used. Further, as will be described later, the welding position is finely adjusted by moving horizontally on the lifting frame 27 in the width direction.
First, about the backing device 10, after describing the structure of the 1st backing member 11a and the 2nd backing member 11b, another structure is demonstrated.

[First backing member]
The first backing member 11a is a member that presses the backing flux placed on the backing copper plate against the back surface of the welding groove portion M where the steel plate E to be welded is abutted. As shown in FIG. 2, the length L1A of the first backing member 11a is equal to or longer than the length L2A of the weld groove portion M of the steel plate E to be welded. And since the 1st backing member 11a has such length L1A, when welding the to-be-welded steel plate E, the 1st backing member 11a is backed over the full length of the welding groove part M. It becomes possible to supply a flux, and a good back surface welded part shape can be obtained.

  As shown in FIGS. 2, 3, 4 (a) and 4 (b), the first backing member 11 a includes a backing copper plate 12 and a support frame 16. The backing copper plate 12 is arranged along the welding groove portion M of the steel plate E to be welded, and a plurality of copper plate pieces 13 having a predetermined length L3 (for example, 100 to 500 mm) are connected via the connecting member 14. is there.

  And the connection member 14 has the through-hole 13a by which the connection metal fitting 14A which mounts the copper plate piece 13 in the edge part of the adjacent copper plate piece 13, and the connection metal fitting 14A and the mounted copper plate piece 13 are formed in advance. It is preferable that a connecting pin 14B that is inserted into and connected to 14Ac is provided, and a convex portion 14Ad that can slide along the support frame 16 is formed on the lower surface of the connecting bracket 14A.

  Specifically, in order to connect the adjacent copper plate pieces 13, the copper plate pieces 13 are formed with through holes 13 a penetrating in the width direction at both ends in the longitudinal direction. And the connection metal fitting 14A consists of bottom part 14Aa which mounts the adjacent copper plate piece 13, and side part 14Ab standingly arranged by the both ends of bottom part 14Aa. Further, the bottom portion 14Aa has a length substantially equal to the length of the copper plate piece 13 in the end width direction. A plurality of protrusions 14Ad are formed on the bottom surface of the bottom portion 14Aa at positions corresponding to the plurality of rails 17 when the backing copper plate 12 is supported by a support frame 16 described later. 17 is set slightly wider than the outer distance L4 between the 17 and 17 (for example, the distance between the convex portions: 132 mm, the outer distance L4 between the rails 17 and 17: 131 mm, see FIGS. 3, 5A and 3B). The same number of convex portions 14Ad as the rails 17 are formed. Further, the side portion 14Ab has a height substantially equal to the plate thickness of the copper plate piece 13, and a through hole 14Ac corresponding to the through hole 13a is formed.

  And the edge part of the adjacent copper plate piece 13 is faced | matched, The width direction of the copper plate piece 13 is mounted in the bottom part 14Aa of 14 A of connection metal fittings in that position, The through-hole 13a of the copper plate piece 13, and side part 14Ab of 14 A of connection metal fittings The copper plate piece 13 is connected to the through hole 14Ac by inserting a connecting pin 14B having a length substantially equal to the length of the copper plate piece 13 in the width direction. Further, when the copper plate pieces 13 connected in this way are supported by the support frame 16, the convex portions 14 Ad of the connection fitting 14 </ b> A are guided by the rails 17 and are not detached from the rails 17 and 17. Therefore, it becomes possible to slide in the weld groove direction of the steel plate E to be welded, that is, in the longitudinal direction of the connected copper plate pieces 13. As a result, at the time of welding, the connected copper plate pieces 13 easily move in the direction of the weld groove portion, and it becomes possible to obtain a favorable back surface welded portion shape.

  A backing flux is placed on the upper surface of the backing copper plate 12. The supply of the backing flux to the upper surface of the backing copper plate 12 is arranged above the backing copper plate 12, and is a hopper-shaped flux supply means that is movable in the longitudinal direction of the backing copper plate 12 by driving an endless chain or the like. 29a (see FIG. 11).

  As described above, the support frame 16 supports the backing copper plate 12 so as to be slidable in the direction of the weld groove. Specifically, the support frame 16 has a predetermined outer distance L4 (for example, supporting the backing copper plate 12). It is preferable to include a plurality of rails 17 arranged at a distance of 50 to 300 mm and a support plate 19 that supports the rails 17.

  And as above-mentioned, the rail 17 guides convex part 14Ad of the connection member 14, and enables the copper plate piece 13 connected with the connection member 14 to slide in the welding groove part direction. Although two rails 17 are illustrated in FIG. 3, three or more rails 17 may be provided. Further, the support plate 19 is a long plate formed over the entire length of the weld groove M.

  In this way, the backing copper plate 12 is formed by connecting a plurality of copper plate pieces 13, and the backing copper plate 12 is slidable without being fixed to the support frame 16, so that the backing copper plate 12 is pressed against the welded steel plate E. When this occurs, the backing copper plate 12 slides in the direction of the weld groove, and no variation occurs in the gap between the backing copper plate 12 and the steel plate E to be welded. Furthermore, the backing copper plate 12 is held in a normal backing position during welding and expands easily, the buckling copper plate 12 does not buckle, and the gap between the backing copper plate 12 and the steel plate E to be welded. There is no variation. As a result, the contact state of the backing flux to the back side of the weld groove portion M becomes good.

  As shown in FIGS. 5A and 5B, the backing device of the present invention includes an air hose 25 interposed between the support frame 16 and the first support structure 20 that supports the support frame 16. It is preferable.

  The air hose 25 is disposed over the entire length of the support frame 16 and is expanded by compressed air to raise the backing copper plate 12, specifically, the support frame 16, relative to the first support structure portion 20. The backing flux placed on top of the copper plate 12 is pressed against the back surface of the weld groove portion M of the steel plate E to be welded. 5A and 5B, the two air hoses 25 are described. However, the number of the air hoses 25 is not limited to two as long as the backing copper plate 12 can be raised.

  The 1st support structure part 20 is a flame | frame which mounts the 1st backing member 11a in the upper part. The first support structure 20 includes, for example, a top plate 23 extending along the longitudinal direction of the first backing member 11a, side plates 22 standing on both sides in the width direction of the top plate 23, and both side plates 22. , 22 and a bottom plate 21 connected between the two.

  The top plate 23 extends over the entire length of the first backing member 11a in the longitudinal direction, and the air hose 25 is disposed on the top plate 23. As shown in FIG. 1, the bottom plate 21 is supported by a backing roller portion 27 a disposed on an upper part of an elevating frame 27 described later. Therefore, the bottom plate 21 does not need to be provided over the entire length in the longitudinal direction, and may have a predetermined length supported by the backing roller portion 27a. And the 1st support structure part 20 is horizontally moved on the backing roller part 27a by the drive mechanism (not shown) provided with the engaging part engaged with the baseplate 21 in the width direction.

  Further, in the backing device of the present invention, it is preferable to provide an elevating guide 24 for stabilizing the ascent of the backing copper plate 12 by the air hose 25, specifically, for raising the support plate 19 while maintaining a horizontal state. .

  A number of lifting guides 24 are arranged at predetermined intervals in the longitudinal direction of the air hose 25 arranged on the upper part of the first support structure 20. When two air hoses 25 are arranged, they are arranged between the air hoses 25, and when one air hose 25 is arranged, they are arranged on both sides of the air hose 25 in the width direction (not shown). )

  One end of the elevating guide 24 is fixed to the support frame 16 that supports the backing copper plate 12, and the other end is inserted through a guide hole formed in the top plate 23 of the first support structure 20. When the air hose 25 is expanded or contracted, the support plate 19 is guided by the elevating guide 24, and therefore elevates while maintaining the horizontal state.

  The raising / lowering guide 24 consists of a rod-shaped member, for example, and the length is long enough to slide and press the backing flux placed on the backing copper plate 12 against the back surface of the welding groove portion M. Have The raising / lowering guide 24 may have a stopper which is larger in diameter than the guide hole at the other end (not shown).

[Second backing member]
The 2nd backing member 11b is a part which presses the flux F to the back surface of the welding groove part M which faced the steel plate E to be welded. As shown in FIG. 7B, the second backing member 11 b includes a flux F, a trough 40 that holds the flux F, and a trough frame 41.
As shown in FIG. 6, the second backing member 11b is formed such that the total length L1B of the second backing member 11b is equal to or greater than the length L2B of the weld groove portion M of the steel plate E to be welded. The welded steel sheet E can be welded from the welding start end to the welding end. And when the 2nd backing member 11b has such length L1B and is arrange | positioned along the welding groove part M, when welding the to-be-welded steel plate E, the full length of the welding groove part M A sufficient amount of flux F is supplied over a wide range, and a good weld shape can be obtained.

  The flux F shown in FIG. 7B is a powdery material used for the purpose of removing oxides and harmful substances generated by welding, blocking the atmosphere of the welded part, shaping the welded part shape, and the like. This flux F is accommodated in the trough 40 and supplied to the back side of the welded portion of the steel plate E to be welded. The flux F is formed by laminating a backing flux F1 in close contact with the back surface of the weld groove portion M of the steel plate E to be welded and a layer of the underlying flux F2 laid under the layer of the backing flux F1 in the trough 40. Are arranged.

The trough 40 is a long container that supports the flux F supplied from the flux supply means 29b (see FIG. 11) of the single-side welding apparatus 1 so as to be supplied to a position below the welding groove M. Become. The trough 40 is disposed along the weld groove M below the steel plate E to be welded, and is formed in a substantially U-shaped groove when viewed from the front, and a substantially straight groove when viewed from the top. The trough 40 is fixed together with the fixing plate 41b in a state where the upper and lower end portions of the trough 40 are interposed between the upper ends of the pair of trough support frames 41a and 41a and the fixing plate 41b is addressed. By being fixed by the tool 41c, the trough support frames 41a and 41a are arranged so as to span between the upper ends of the trough support frames 41a and 41a. The trough 40 is formed of a material whose bottom portion can be deformed when pushed upward by the expansion of the first air hose 62a or the second air hose 62b disposed below the trough 40.
The trough 40 has a length of the opening width D orthogonal to the longitudinal direction in the range of 50 to 200 mm. The trough 40 is made of an elastic body having a certain degree of rigidity and heat resistance, for example. The trough 40 is made of, for example, a fire hose whose outer side is made of cloth and whose inner side is made of rubber.

  As shown in FIG. 7B, the trough frame 41 has left and right ends of the trough 40 in a state where the bottom surface portion (lower end portion) of the U-shaped trough 40 is lifted from the upper surface of the support plate 42 in a vertical cross-sectional view. It is a frame member holding a part. The trough frame 41 includes trough support frames 41a and 41a erected on both right and left sides of the trough 40, fixing plates 41b and 41b for fixing the trough 40 to the trough support frames 41a and 41a, and fixing plates 41b and 41b. Fixing means 41c, 41c for fixing the trough support frames 41a, 41a to the trough support frames 41a, 41a, a support plate 42 for erecting the trough support frames 41a, 41a, and an elevating guide 61 suspended from the center of the lower surface of the support plate 42. Are fixed together. The trough frame 41 is configured to be raised and lowered by two types of lifting and lowering means including expansion and contraction of a third air hose 62c, which will be described later, and a lifting device 26.

The trough support frames 41 a and 41 a are a pair of long thick plate members provided vertically on the upper surface of the support plate 42, and extend to the left and right positions along the welding groove portion M of the steel plate E to be welded. Has been.
The fixed plates 41b and 41b are plate-like holding members arranged so as to be in contact with the upper ends of the left and right inner walls of the trough support frames 41a and 41a with the trough 40 interposed therebetween, and are upper portions of the trough support frames 41a and 41a. It is formed elongated along.
The fixtures 41c and 41c are composed of bolts or the like for fastening the fixing plates 41b and 41b to the trough support frames 41a and 41a.

  As shown in FIGS. 7A and 7B, the support plate 42 is formed across the longitudinal direction of the second backing member 11b on which the trough support frame 41a, the slope plate 43, and the air hose 62 are placed. It is a long plate, and is a thick plate member that is horizontally disposed in a state in which it can move up and down with respect to the upper portion of the second support structure portion 57. Between the trough support frames 41a and 41a on the support plate 42, a first air hose 62a, a second air hose 62b, a hose band 62d and a hose band fixing clip 62e are placed. On the outer upper side of the trough support frames 41a, 41a on the support plate 42, a slope plate 43 for guiding the dropped flux F further downward is disposed. The support plate 42 is supported by the side plates 59 and 59 of the second support structure 57 at the left and right ends of the lower surface when the third air hose 62c is contracted. As shown in FIG. 8, when the third air hose 62c is expanded, the support plate 42 is pushed up by the pair of expanded third air hoses 62c and 62c.

  The raising / lowering guide 61 guides the support plate 42 when the support plate 42 moves up and down. The elevating guide 61 is installed from a lower center of the support plate 42 and is composed of a support column that is inserted and supported by the top plate 60 and the bottom plate 58 of the second support structure 57 so as to be movable up and down. Many are arranged at predetermined intervals in the longitudinal direction. The elevating guide 61 has an upper end fixed to the support plate 42 and a lower end inserted through guide holes 67 and 67 formed in the top plate 60 and the bottom plate 58, and along the side plate 59 of the second support structure portion 57. It is formed to be guided.

The elevating guide 61 is made of, for example, a rod-like member, and the length thereof is used to bring the trough 40 held by the trough frame 41 close to or in contact with the back side of the welding groove portion M when sliding upward. It has a sufficient length. The elevating guide 61 is formed at the lower end of the elevating guide 61 with a diameter larger than that of the guide holes 67, 67, and contacts the lower surface of the bottom plate 58 of the second support structure portion 57 when the elevating guide 61 is raised. A stopper 61c and a fixing member 61a made of a nut or the like for fixing the stopper 61c to a predetermined position of the elevating guide 61 are provided.
The elevating guide 61 slides by being guided by the guide holes 67 and 67 of the second support structure 57 on the center side of the third air hose 62c by the expansion or contraction of the third air hoses 62c and 62c. It is raised and lowered in a horizontal state to prevent the trough frame 41 from tilting and maintain a horizontal state.

  As shown in FIGS. 8 and 9, the air hose 62 is a hose whose height is varied by expansion or contraction by compressed air sent into the air hose 62, and directly or indirectly the trough 40 containing the flux F. The function of the raising / lowering means for raising and lowering the flux F to press the flux F against the back surface of the weld groove portion M of the steel plate E to be welded is achieved. The air hose 62 is composed of three types of hoses, that is, a total of four air hoses 62, one first air hose 62a, one second air hose 62b, and two third air hoses 62c. The 1st air hose 62a, the 2nd air hose 62b, and the 3rd air hose 62c are each connected to a pressurization apparatus (not shown), and compressed air is supplied.

  The first air hose 62a, the second air hose 62b, the hose band 62d, and the hose band fixing clip 62e are disposed below the trough 40 having a U-shaped cross section and on the inner bottom of the trough frame 41 formed in a concave shape when viewed in cross section. It is installed. The first air hose 62a and the second air hose 62b are arranged vertically between the trough 40 and the upper part of the trough frame 41 so that the second air hose 62b having a smaller diameter than the first air hose 62a is arranged vertically with the first air hose 62a. In an overlapped state, the trough frame 41 is arranged along the length direction.

  As shown in FIG. 8, the 1st air hose 62a raises / lowers the trough 40 which accommodated the flux F by expanding and shrink | contracting. The first air hose 62a extends along the trough frame 41 between the lower portion of the trough 40 and the upper portion of the trough frame 41, and compressed air is sent from a pressurizing device (not shown) when welding is performed. When it expands, the bottom surface of the trough 40 is pushed upward, and the flux F is pressed against the back surface of the steel plate E to be welded. As shown in FIG. 7 (a), the outer diameter D1 of the first air hose 62a is formed larger than the outer diameter D2 of the second air hose 62b, and the maximum in the vertical direction of the trough 40 when the central portion is pushed up by the air hose 62. Stroke width.

  As shown in FIG. 9, the 2nd air hose 62b raises / lowers the trough 40 which accommodated the flux F by expanding and shrink | contracting. The second air hose 62b is mounted on the lower support plate 42 of the first air hose 62a, extends along the trough 40, and collects the used backing flux F1 of the upper layer solidified after welding. When compressed air is sent from a pressurizing device (not shown) and expanded, the lower end of the trough 40 is pushed upward. The second air hose 62b is held by a hose band 62d and a hose band fixing clip 62e (see FIG. 7A). Since the second air hose 62b only needs a short stroke to lift the flux F solidified by welding upward from the upper end of the trough frame 41, the outer diameter D2 is smaller than the first air hose 62a (FIG. 7A). (See) hose. The diameter B2 of the second air hose 62b at the time of maximum expansion is such that the outer diameter D2 is the maximum stroke width in the vertical direction.

  As shown in FIG. 8, the third air hoses 62c and 62c are expanded and contracted to raise and lower the trough 40 containing the flux F through the support plate 42 and the trough support frames 41a and 41a. . The third air hoses 62c and 62c extend along the trough frame 41, and when performing welding, compressed air is sent from a pressurizing device (not shown) to expand the bottom surface of the trough frame 41 upward. The trough 40 held by the trough frame 41 is brought close to or in contact with the rear surface of the steel plate E to be welded. The third air hoses 62c and 62c are between the support plate 42, which is a part of the trough frame 41, and the top plate 60 of the second support structure portion 57 mounted on the lifting device 26 (see FIG. 1). It consists of a pair of hoses that are placed separately on the left and right with a lifting guide 61 disposed at the center of the top plate 60 as the center.

  As shown in FIG. 7A, the hose band 62d is a member for holding the second air hose 62b at the central portion of the inner bottom of the concave trough frame 41. The hose band 62d is arranged such that a pair of notches 62f and 62f formed at a width interval of the second air hose 62b are passed through the hose band fixing clip 62e, thereby the hose band fixing clip 62e and the second air hose. Holds 62b.

  The hose band fixing clip 62e is a member for holding the second air hose 62b fixed to the hose band fixing clip 62e on the support plate 42 by the hose band 62d. The hose band fixing clip 62e is installed or engaged with the inner bottom of the concave trough frame 41.

  The pressurizing device (not shown) is connected to the first air hose 62a, the second air hose 62b, and the third air hose 62c via tubes (not shown), and supplies compressed air to each of them. An apparatus, for example, a compressor. Further, air supply control for individually controlling the internal pressure of each of the pressurizing device and the first air hose 62a, the second air hose 62b, and the third air hose 62c in order to send and compress the compressed air. There is a device (not shown).

  As shown in FIG. 8, the second support structure portion 57 is a frame on which the second backing member 11 b is mounted on the upper portion of the second support structure portion 57, and extends along the longitudinal direction of the second backing member 11 b. The top plate 60 is extended, the side plate 59 is erected on both sides in the width direction of the top plate 60, and the bottom plate 58 is connected between the side plates 59, 59.

The top plate 60 extends over the entire length of the second backing member 11b in the longitudinal direction, and the third air hoses 62c and 62c are disposed on the top plate 60, and the third air hoses 62c and 62c are disposed at the center in the width direction. A guide hole 67 for guiding the elevating guide 61 is formed.
As shown in FIG. 1, the bottom plate 58 is supported by a backing roller portion 27 a disposed at the top of the elevating frame 27 described later, and adjusts the position of the second backing member 11 b in the width direction with respect to the welding groove portion M. To do. The stopper 61c of the raising / lowering guide 61 when it is lifted contacts the bottom plate 58. Therefore, the bottom plate 58 does not need to be provided over the entire length in the longitudinal direction, and may have a predetermined length supported by the backing roller portion 27a. And the 2nd support structure part 57 moves horizontally on the backing roller part 27a in the width direction by the drive mechanism (not shown) provided with the engaging part engaged with the baseplate 58. FIG.

[Other configurations]
As shown in FIG. 1, the backing device 10 of the present invention includes a lifting device 26 that lifts and lowers the first support structure 20, and the lifting device 26 moves the first backing member 11 a to the rising end of the backing copper plate 12. When raised to 12a, the gap S1 between the first backing member 11a and the steel plate E to be welded is set to 75% or less of the maximum expanded diameter of the air hose 25, and the air pressure of the air hose 25 is 0. The range is preferably in the range of 0.05 to 0.5 MPa (see FIGS. 5A and 5B).

  Further, the backing device 10 of the present invention includes an elevating device 26 for raising and lowering the trough frame 41, and elevating means comprising the air hose 62 between the trough 40 and the second support structure portion 57 on the elevating device 26. Is provided. The backing device 10 has a gap S2 between the upper surface of the trough frame 41 and the rear surface of the welded steel plate E when the second backing member 11b is raised to its rising end by the lifting device 26 (FIG. 7B). The first air hose 62a and the third air hose 62c are made to have heights B1 and B3 that are 75% or less of the diameter when the first air hose 62a and the third air hose 62c are expanded in a cylindrical shape. The air pressure is preferably in the range of 0.05 to 0.5 MPa (see FIG. 8).

  The lifting device 26 is preferably disposed inside a lifting frame 27 having the following configuration. The elevating frame 27 is a frame that is arranged directly below the first support structure 20 and the second support structure 57 and elevates in the vertical direction. The elevating frame 27 is supported by the elevating device 26 and has a backing roller at the top. The part 27a is arranged.

  The elevating frame 27 is formed in a substantially box shape by joining the shape steel and the plate material, and has a lower side frame 27b extending in the width direction, and a side frame 27c formed in a ladder shape at both ends of the lower side frame 27b. 27c and a pair of clamping plates 27d and 27d interposed between the side frames 27c and 27c. The pair of sandwiching plates 27d and 27d are spaced apart from each other at a predetermined interval in the longitudinal direction, sandwich the backing roller portion 27a, and the upper end of the lifting device 26 is abutted and supported at the lower end. Further, a plurality of the pair of sandwiching plates 27d and 27d are arranged in parallel at predetermined intervals over the entire length of the side frame 27c. Further, the lifting device 26 is inserted into the lower frame 27b.

In the backing device 10, the reason for defining the gap S1 between the backing copper plate 12 and the welded steel plate E when the first backing member 11a is raised to the rising end 12a of the backing copper plate 12 by the lifting device 26 is as follows. It is as follows.
As shown in FIGS. 5 (a) and 5 (b), when the gap S1 with the welded steel sheet E exceeds 75% of the maximum expansion diameter of the air hose 25, the gap S1 is too large and welding due to air hose expansion is performed. Since the pressing force of the backing flux against the groove portion M is small, the back bead defect and the melt-down are likely to occur. Therefore, the clearance S1 is preferably 75% or less of the maximum expansion diameter of the air hose 25.

In the backing device 10, the reason why the air pressure at the time of expansion of the air hose 25 is specified is as follows.
When the air pressure is less than 0.05 MPa, the pressing force of the backing flux to the weld groove M is small, and therefore, the back bead failure and the erosion are likely to occur. When the air pressure exceeds 0.5 MPa, the pressing of the backing copper plate 12 to the welded steel plate E becomes excessive and the welded steel plate E is lifted, so that a weld crack is likely to occur. Therefore, the air pressure is preferably 0.05 to 0.5 MPa.

In the backing device 10, the reason why the clearance S2 between the trough frame 41 and the steel plate E to be welded when the second backing member is raised to the rising end of the trough 40 by the lifting device 26 is as follows. It is.
As shown in FIG. 7B, when the gap S2 between the flux F (second backing member 11b) and the back surface of the steel plate E to be welded exceeds 75% of the diameter of the third air hose 62c at the time of maximum expansion. The gap S is too large, the amount of flux F supplied to the welding groove M due to the expansion of the first air hose 62a and the third air hose 62c is small, and the pressing force is weak. It becomes easy. Therefore, the clearance S2 is preferably not more than 75% of the diameter of the first air hose 62a and the third air hose 62c at the time of maximum expansion.

In the backing device 10, the reason why the air pressure at the time of expansion of the air hose 62 is specified is as follows.
When the air pressure is less than 0.05 MPa, the pressing force of the flux F to the weld groove portion M is small, so that the back bead failure and the erosion are likely to occur. When the air pressure exceeds 0.5 MPa, the trough 40 is excessively pressed against the back surface of the steel plate E to be welded and the steel plate E to be welded is lifted, so that a weld crack is likely to occur. Therefore, the air pressure is preferably 0.05 to 0.5 MPa.

Further, as shown in FIG. 11, the backing device 10 includes a flux supply means 29a for supplying backing flux to the upper surface of the backing copper plate 12 (see FIG. 5). The flux supply means 29a, for example, spreads the backing flux on the backing copper plate 12 by moving the flux on the backing copper plate 12 along the length direction by driving an endless chain or the like. And a cart for scraping and recovering the solidified backing flux.
Further, as shown in FIG. 11, the backing device 10 includes a flux supply means 29b for supplying the flux F to the trough 40 (see FIG. 7B). This flux supply means 29b is, for example, a hopper that supplies flux, and the underlay flux F2 (see FIG. 7 (b)) and the back by moving on the trough 40 along the length direction by driving an endless chain or the like. The flux F1 is sprayed on the trough 40, and the solidified flux F is scraped off and collected.

  Further, as shown in FIG. 1, the backing device 10 of the present invention preferably includes a flux collecting means 28 that collects the used backing flux that has been scraped off after welding of the welding groove portion M. The flux collecting means 28 includes, for example, a tapered portion 28a that is disposed inside the elevating frame 27 and expands above the elevating frame 27, and a screw-like conveyor portion 28b that discharges the collected backing flux to the outside. .

Here, one flux collecting means 28 is provided, but as shown in FIG. 10, from the first flux collecting means 28A for collecting the flux dropped from the first backing member 11a and the second backing member 11b. It is good also as a structure provided with the two flux collection | recovery means of the 2nd flux collection | recovery means 28B which collect | recovers the flux to fall.
By setting it as such a structure, when the flux is scraped off after welding of the welding groove portion, the flux dropped from the first backing member 11a and the flux dropped from the second backing member 11b, Can be collected individually.

Moreover, it is preferable to provide the connection part G which connects the 1st support structure part 20 of the 1st backing member 11a, and the 2nd support structure part 57 of the 2nd backing member 11b.
The connection part G will not be specifically limited if the width direction rigidity of the 1st support structure part 20 and the 2nd support structure part 57 is improved. Moreover, it is preferable that the connection part G is provided with two or more at predetermined intervals over the longitudinal direction, ie, it is provided with two or more space parts P. By providing the space P, it is possible to prevent the spent flux scraped from the first backing member 11a and the second backing member 11b from collecting in the connecting portion G.

<Single-side welding equipment>
Next, the single-side welding apparatus according to the present invention will be described.
As shown in FIGS. 1, 11, and 12, the single-sided welding device 1 preferably includes a backing device 10, a gantry frame 104, a conveying and fixing means 105, and a welding machine 30. Each configuration will be described below. Since the backing device 10 is as described above, the description thereof is omitted.

  As shown in FIG. 1, the gantry frame 104 is formed so as to exhibit a concave shape in cross-section by using a steel square frame, and the upper side is opened, and the backing device 10 is supported inside. 10 is a frame extending along the longitudinal direction of 10. The gantry frame 104 is provided with two main beams 104a arranged side by side along the longitudinal direction, a connection beam 104b connected at a right angle between the main beams 104a and 104a, and a vertical installation on the connection beam 104b. A connecting beam 104c, auxiliary beams 104d and 104d installed in parallel above the main beams 104a and 104a, and a cantilever beam 104e protruding from the auxiliary beams 104d and 104d toward the opposite side of the backing device 10, respectively. Is provided. Further, the gantry frame 104 is provided with a carriage part 108 below the connecting beam 104b, and on a plurality of rails 107 (see FIG. 11) arranged in parallel in the longitudinal direction of the backing device 10 with a predetermined interval. The carriage unit 108 moves in the width direction of the backing device 10.

  As shown in FIG. 1, the conveying and fixing means 105 is disposed on the auxiliary beam 104d of the gantry frame 104 and horizontally moves the steel plate E to be welded above the backing device 10, and includes a panel moving roller 105a, a magnet. The apparatus 105b is configured. An auxiliary roller 106 is disposed on the cantilever 104 e of the gantry frame 104 in order to assist the conveyance of the welded steel plate E by the conveyance means 105.

  As shown in FIGS. 11 and 12, the welding machine 30 is disposed above the backing device 10 and welds the steel plate E to be welded from the front side of the welding groove portion M. The welding machine 30 moves to a traveling carriage 31 that travels a welding machine beam 101 that extends along the longitudinal direction of the first backing member 11 a and the second backing member 11 b of the backing device 10, and the traveling carriage 31. An adjustment jig 32 attached to the adjustment jig 32 and a welding torch 33 attached to the adjustment jig 32 are provided.

  Then, the bearing 31a is fixed to the traveling carriage 31, and the rail 32a provided on the adjustment jig 32 moves through the fixed bearing 31a, whereby the adjustment jig 32 is moved to the first backing member 11a and the second backing member 11a. The welding torch 33 attached to the adjustment jig 32 moves in the width direction of the backing member 11b. In the welding machine 30, the bearing 31a is fixed, and the adjustment jig 32 (welding torch 33) moves in the width direction of the first backing member 11a and the second backing member 11b together with the rail 32a via the bearing 31a. To do. Therefore, the rail 32a and the welding wire W supplied to the welding torch 33 do not interfere with each other.

<Welding method>
Next, the welding method using the single-sided welding apparatus provided with the backing apparatus which concerns on this invention is demonstrated with reference to FIGS. Here, the welding method when the first backing member 11a is used will be described as a first operation procedure, and the welding method when the second backing member 11b is used will be described as a second operation procedure.

[First operation procedure]
In the welding method according to the present invention, the steel plate E to be welded is moved to a corresponding position where the backing device 10 is installed, and the back of the welding groove portion M of the steel plate E to be welded is placed on the back surface of the backing device 10. 1 Welding work is performed by pressing the backing member 11a. Specifically, a first step of raising the backing copper plate 12 and a second step of pressing the backing flux placed on the backing copper plate 12 against the back surface of the weld groove portion M by expanding the air hose 25. And a third step of performing single-sided welding by the welding machine 30. Hereinafter, each step will be described.

In the welding method of this invention, it is preferable to include the preparatory process of supplying the backing flux and adjusting the position of the welded steel sheet E prior to the first to third processes.
(Preparation process)
As shown in FIGS. 1 and 11, first, an endless chain or the like (not shown) that supports the flux supply means 29a disposed above the first backing member 11a is driven, and the flux supply means 29a is moved to the first position. While moving in the longitudinal direction of the backing member 11a, the backing flux is supplied to the upper surface of the backing copper plate 12. Then, the temporarily welded steel plate E is moved by the panel moving roller 105 a and the auxiliary roller 106, and the welding groove portion M formed by the welded steel plate E is disposed above the backing device 10. And the drive device which is not illustrated is operated and the fine adjustment of the width direction of the 1st backing member 11a is performed so that the backing copper plate 12 may be located just under the welding groove part M. FIG. Specifically, the first support structure portion 20 on which the first backing member 11 a is mounted is placed on the backing roller portion 27 a disposed above the lifting frame 27 disposed directly below the first support structure portion 20. Use to move horizontally in the width direction. When the fine adjustment in the width direction is completed, the magnet device 105b is activated, and the welded steel sheet E is attracted downward and fixed by magnetism.

(First step)
As shown in FIGS. 1 and 5A, the lifting device 26 is driven to raise the backing copper plate 12 holding the backing flux to a predetermined position set in advance. In the present invention, the predetermined position means a position where the position of the rising end 12a of the backing copper plate 12 is 75% or less of the maximum expansion diameter of the air hose 25 as the gap S1 with the steel plate E to be welded.

(Second step)
As shown in FIG. 5B, compressed air is introduced into the two air hoses 25, 25 to expand the air hoses 25, 25. Due to the expansion of the air hoses 25, 25, the lifting guide 24 inserted in the guide hole provided in the top plate 23 of the first support structure 20 slides, and the support frame 16 fixed to one end of the lifting guide 24 is moved. Push up.

  By pushing up the support frame 16, the backing copper plate 12 supported by the support frame 16 is pressed against the back side of the welding groove portion M, and the backing flux is pressed against the back surface of the welding groove portion M.

(Third step)
As shown in FIGS. 11 and 12, one-side welding, for example, one-sided submerged arc welding is performed by a welding torch 33 from the front side of the welding groove M while moving the welding machine 30 on the welding machine beam 101 at a predetermined speed. Then, the steel plate E to be welded is welded.

  Next, when there are a plurality of welding groove portions M, the air in the air hose 25 is discharged, the lifting guide 24 and the support frame 16 are lowered, and the backing copper plate 12 is pulled away from the back side of the steel plate E to be welded. Next, the lifting frame 27 is lowered by the lifting device 26, and the first backing member 11 a is further pulled away from the back side of the steel plate E to be welded. Next, the flux supplying means 29a having the function of performing the removal of the used flux on the upper surface of the backing copper plate 12 and the spraying of the new backing flux is driven by driving an endless chain or the like (not shown). The used flux on the upper surface of the copper plate 12 is removed, and a new backing flux is supplied to the upper surface of the backing copper plate 12 together. Then, the fine adjustment by the said preparation process is performed so that the backing copper plate 12 may be located just under the next welding groove part M, and the said 1st-3rd process is performed. Such an operation is performed a plurality of times.

[Second operation procedure]
In the welding method according to the present invention, the welded steel plate E is moved to a position where the backing device 10 is installed, and the second of the backing device 10 is aligned along the weld groove portion M of the welded steel plate E. The backing member 11b is pressed to perform welding work. Specifically, the first step of raising the trough 40 and the second step of inflating the trough 40 by injecting compressed air into the third air hose 62c so that the upper end of the trough 40 comes close to or abuts the back surface of the weld groove portion M. And a third step of expanding the first air hose 62a and pressing the flux F in the trough 40 against the back surface of the weld groove portion M, and a fourth step of performing single-side welding. Hereinafter, each step will be described.

  In the welding method of this invention, it is preferable to include the preparatory process of supplying the flux F and adjusting the position of the steel plate E to be welded prior to the first to fourth processes.

(Preparation process)
Flux F is supplied from the flux supply means 29b shown in FIG. 11 into the trough 40 of the second backing member 11b. At that time, the first air hose 62a, the second air hose 62b, and the third air hose 62c are in a contracted state as shown in FIG. For this reason, the trough 40 containing the flux F is in a state where the lower end portion hangs down from the trough frame 41 due to the weight of the flux F. In addition, the trough frame 41 is in a state where the support plate 42 is placed on the upper ends of the side plates 59 and 59 and is lowered.
When supplying the flux F, an endless chain or the like (not shown) that supports the flux supply means 29b is driven, and the flux supply means 29b travels along the longitudinal direction of the trough 40, while the underlay is accommodated in the hopper. The flux F2 and the backing flux F1 are sequentially dispersed to supply the flux F to the second backing member 11b (trough 40).

Then, as shown in FIG. 1, the welded steel plate E that is temporarily attached is moved by the panel moving roller 105 a and the auxiliary roller 106, and a welding groove portion formed by the steel plate E to be welded above the backing device 10. Position M. And the drive device which is not shown in figure is operated, and the fine adjustment of the width direction of the 2nd backing member 11b is performed so that the trough 40 may be located just under the welding groove part M. FIG.
Specifically, the second support structure portion 57 on which the second backing member 11b is mounted is disposed on the backing roller portion 27a disposed on the upper and lower frames 27 disposed immediately below the second support structure portion 57. Move horizontally across the top.
When the fine adjustment in the width direction is completed, the magnet device 105b is activated, and the welded steel sheet E is attracted downward and fixed by magnetism. At this time, each air hose 62 is in a contracted state as described above. For this reason, the trough 40 and the trough frame 41 are in a lowered state.

(First step)
As shown in FIG. 1, the lifting device 26 is driven, the flux F is held, and the weld groove M is at least the length L2B and the minimum length L1B toward the weld groove M of the welded steel sheet E. Is raised to a predetermined position in the vicinity of the steel plate E to be welded.
In the present invention, the predetermined position refers to the gap S2 between the second backing member 11b and the welded steel plate E when the second backing member 11b is raised to the rising end of the trough 40 by the lifting device 26. 3 A position that is 75% or less of the diameter of the air hose 62c at the time of maximum expansion.

(Second step)
As shown in FIG. 8, two third air hoses 62c and 62c disposed between the support plate 42 of the trough frame 41 and the top plate 60 of the second support structure 57 on the lifting device 26 are provided. It expands by injecting compressed air with a pressurizing device (not shown). Along with the expansion of the third air hoses 62c, 62c, the lifting guide 61 rises while being guided by the guide holes 67, 67 of the top plate 60 and the bottom plate 58 on the center side of the third air hoses 62c, 62c. The support plate 42 fixed to the upper end of the guide 61 is pushed up by a height H (see FIG. 7B), and the entire trough frame 41 is raised by the height H.
Then, the third air hose 62c is expanded until the stopper 61c provided at the lower end of the lifting guide 61 comes into contact with the lower surface of the bottom plate 58 of the second support structure 57. At this time, by pushing up the support plate 42, the trough support frames 41a, 41a and the trough 40 integral with the support plate 42 are simultaneously raised, and the upper end of the trough 40 is close to the back side of the weld groove portion M of the steel plate E to be welded. Or it is raised to a position where it abuts.
That is, when the amount of the flux F stored in the trough 40 is somewhat small and there is no rise from the trough 40, the upper end of the trough 40 rises to a position where it presses against the back side of the welding groove portion M.
Further, when the amount of the flux F stored in the trough 40 is somewhat large and the rise from the trough 40 is large, the upper end of the trough 40 reaches a position close to the back side of the welding groove portion M of the steel plate E to be welded. As a result, the backing flux F1 is pressed against the back side of the weld groove portion M.

(Third step)
Air is introduced into the first air hose 62a by a pressurizing device (not shown), and the first air hose 62a is expanded. Due to the expansion of the first air hose 62a disposed on the lower side of the trough 40, the lower end of the trough 40 containing the flux F is pushed up, and the flux F is completely pushed up to a height at which it contacts the welded steel plate E. F is pressed against the back side of the weld groove portion M of the steel plate E to be welded with an appropriate pressing force.

(4th process)
Then, as shown in FIG. 12, while moving the welding machine 30 on the welding machine beam 101 at a predetermined speed, one-side welding is performed from the front side of the welding groove portion M by the welding torch 33, and the steel plate E to be welded is obtained. Weld.

  Next, when there are a plurality of welding groove portions M, the air in the first air hose 62a and the third air hose 62c is discharged, the lifting guide 61, the support plate 42 and the trough 40 are lowered, and the flux F is covered. Pull away from the back side of the welded steel sheet E. And the raising / lowering frame 27 is lowered | hung with the raising / lowering apparatus 26, the 2nd backing member 11b is further lowered | hung from the back side of the to-be-welded steel plate E, and the backing flux F1 is pulled away from the back surface of the to-be-welded steel plate E. Next, the used portion of the backing flux F1 on the upper surface of the trough 40 is removed, and then an endless chain or the like (not shown) connected to the flux supply means 29b is driven to provide a new backing flux on the upper surface of the trough 40. F1 is supplied. Then, fine adjustment is performed so that the flux F and the trough 40 are located immediately below the next weld groove portion M (preparation step is performed), and the first to fourth steps are performed. Such an operation is performed several times until the weld groove portion M disappears.

(When collecting flux)
In addition, after welding with the welding machine 30, the backing flux F1 is solidified by welding heat. In order to perform the next welding, it is necessary to remove the solidified backing flux F1 and replenish the upper layer in the trough 40 with a new backing flux F1. At this time, since the underlay flux F2 is used as it is, it is preferable to leave the underlay flux F2 as much as possible when removing the solidified backing flux F1.

  In addition, in order to remove the backing flux F1 solidified from the trough 40, the first air hose 62a can be inflated to scrape the backing flux F1, but when a large amount of the underlying flux F2 is scraped together. There is. Further, in order to prevent such inconvenience, a method of inflating the first air hose 62a by half rather than completely inflating it can be considered, but in this case, the extent to which the first air hose 62a swells is constant over the entire length. In some cases, a portion where the solidified backing flux F1 cannot be sufficiently recovered and a portion where the underlay flux F2 is scraped off in a large amount are generated.

  Therefore, as shown in FIG. 9, the second air hose 62b that can lift the flux F in the trough 40 over the entire length L1B of the trough 40 with a lifting width about half that of the first air hose 62a is used. The flux F in the trough 40 is lifted.

  When the solidified used backing flux F <b> 1 is collected, the trough frame 41 is lowered by the elevating device 26 to secure a predetermined space above the trough 40. In this case, as shown in FIG. 9, the first air hose 62a and the third air hoses 62c, 22c are contracted to lower the entire trough frame 41, and the second air hose 62b is supplied with a pressure device (not shown). It is performed after the compressed air is sent and expanded to increase the flux F.

When collecting the flux F, the flux collecting means 28, the trough 40 of the second backing member 11b, the trough frame 41, the second air hose 62b, and the second support structure 57 are used.
In this case, as shown in FIG. 9, the used backing flux F1 is swelled on the upper surface of the trough 40 by expanding the second air hose 62b, and the swelled portion is used as the flux supply means 29b. After the surface of the backing flux F1 is scraped off to a certain height by a flux scraper (not shown) attached to the head, a new backing flux F1 is sprinkled and supplemented by the flux supply means 29b. The flux F scraped off is collected by the flux collecting means 28.

  After the recovery of the solidified flux F is completed, the compressed air is extracted from the second air hose 62b to be in a contracted state. As a result, a depression corresponding to the removed flux F is generated in the trough 40, and a new backing flux F1 is supplied to the trough 40 by the flux supply means 29b. In addition, since the underlay flux F2 is not solidified by welding heat, it can be used repeatedly.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.

For example, the above-described backing device and single-side welding device have been described by taking as an example the case where the steel plate to be welded is moved in the width direction (direction orthogonal to the longitudinal direction of the backing device). However, as shown in FIG. 13, even when the steel plate E to be welded is moved in the longitudinal direction, a backing device 10A having the same configuration as the backing device 10 and the single-side welding device 1 (see FIG. 1). And the single-sided welding apparatus 1A (the welding machine is not shown) can be used. For example, the backing device 10A includes a first backing member 11a, a first support structure portion 20, a second backing member 11b, a second support structure portion 57, and a flux collecting means 28. The single-sided welding device 1A includes a backing device 10A, a gantry frame 104, a conveyance and fixing means 105, and a welder (not shown). In addition, in FIG. 13, about the structure same as the backing device 10 and the single-sided welding apparatus 1, the same code | symbol was attached | subjected. In the backing device 10A, the lifting device 26 (see FIG. 1) for raising and lowering the first backing member 11a and the second backing member 11b is not necessary.
And although the raising / lowering guide 24 was demonstrated as a rod-shaped member, the shape may be plate shape.

  Also in the welding method, other steps may be included before or after each step or between each step within a range that does not adversely affect each step. For example, when the first backing member is used, the other step refers to a step of scraping off the backing flux solidified by welding from the surface of the backing copper plate after the third step.

DESCRIPTION OF SYMBOLS 1, 1A Single-sided welding apparatus 10, 10A Backing apparatus 11a 1st backing member 11b 2nd backing member 12 Backing copper plate 12a Ascending end 13 Copper plate piece 13a Through-hole 14 Connecting member 14A Connecting metal fitting 14Aa Bottom part 14Ab Side part 14Ac Through Hole 14Ad Protruding portion 14B Connecting pin 16 Support frame 17 Rail 19 Support plate 20 First support structure portion 21 Bottom plate 22 Side plate 23 Top plate 24 Lifting guide 25 Air hose 26 Lifting device 27 Lifting frame 27a Backing roller portion 27b Lower side frame 27c Side portion Frame 27d Holding plate 28 Flux collecting means 28a Tapered portion 28b Conveyor portions 29a, 29b Flux supplying means 30 Welding machine 31 Traveling carriage 31a Bearing 32 Adjusting jig 32a Rail 33 Welding torch 40 Trough 41 Trough frame 57 Second support Holding structure 62 Air hose 62a First air hose 62b Second air hose 62c Third air hose 101 Welding machine beam 104 Mounting frame 104a Main beam 104b Connection beam 104c Connection beam 104d Auxiliary beam 104e Cantilever beam 105 Conveying and fixing means 105a Panel moving roller 105b Magnet device 106 Auxiliary roller 107 Rail 108 Bogie part B1 Expansion height of first air hose B2 Expansion height of second air hose (diameter at maximum expansion)
B3 Expansion height of the third air hose D Length of the opening width of the trough D1 Outer diameter of the first air hose D2 Outer diameter of the second air hose F Flux (backing member)
F1 Backing flux F2 Underlay flux E Steel plate to be welded L1A, L1B, L2A, L2B, L3 Length L4 Outer spacing S1, S2 Gap M Welding groove W Welding wire G Connection part P Space part

Claims (13)

It is a backing device that is used in a single-sided welding device for connecting steel plates to be welded and performs welding using a flux,
The overall length of the backing device has a first backing member and a second backing member that are not less than the weld groove portion of the steel plate to be welded and have a minimum length,
One of the first backing member and the second backing member is disposed immediately below the weld groove,
The first backing member is disposed along the weld groove portion and has a backing copper plate on which the flux is placed, and a support frame that slidably supports the backing copper plate in the direction of the weld groove portion. The backing copper plate is a plurality of copper plate pieces having a predetermined length connected by a connecting member,
The second backing member is a trough frame disposed along the weld groove portion and a trough that is fixed to the trough frame and stores flux;
The connecting member is a connection that inserts and connects a connecting metal fitting for placing the copper plate piece at the position of the adjacent copper plate pieces and a through-hole formed in advance to the connecting metal fitting and the placed copper plate piece. A pin, and the connecting metal fitting has a lower surface formed with a slidable portion along the support frame,
An air hose having a large diameter in an expanded cross section, interposed between the trough and a trough frame for fixing the trough, and expanded by compressed air to press the flux against the lower surface of the weld groove portion of the steel plate to be welded. An air hose having a smaller diameter at the time of expansion cross-section than the large-diameter air hose, which is expanded by compressed air to push up the used flux.
Each of the air hoses interposed between the trough and the trough frame that fixes the trough has two air hoses with different cross-sectional dimensions arranged vertically ,
An elevating device for raising and lowering the trough frame is provided, and an air hose is provided between the trough frame and a second support structure on the elevating device, and the second backing member is raised by the elevating device. When raised to the end, the gap between the second backing member and the steel plate to be welded is not more than 75% of the diameter of the air hose at the maximum expansion, and the air pressure of the air hose is zero. A backing device having a range of 0.05 to 0.5 MPa .   The said support frame is provided with the several rail arrange | positioned on the back surface side of the said backing copper plate along the longitudinal direction of the said backing copper plate, and the support plate which supports the said rail. The backing device described in 1.   The flux interposed between the support frame and the first support structure that supports the support frame, expanded by compressed air, and placed on the backing copper plate is welded back of the welded groove portion of the steel plate to be welded The backing device according to claim 1, further comprising an air hose that is pressed against the air hose.   A lifting device that lifts and lowers the first support structure portion, and when the first backing member is lifted to the rising end of the backing copper plate by the lifting device, the first backing member and the steel plate to be welded The clearance between the air hose and the air hose is 75% or less of the maximum expanded diameter, and the air pressure of the air hose is in the range of 0.05 to 0.5 MPa. Backing device.   The backing device according to claim 1, wherein the trough has an opening width perpendicular to the longitudinal direction in a range of 50 to 200 mm.   The said flux has laminated | stacked in the said trough the backing flux pressed against the said to-be-welded steel plate, and the layer of the underlying flux laid under this backing flux layer. The backing device described in 1. The backing device includes an elevating device that raises and lowers the trough frame, and an air hose is provided between the trough frame and a second support structure on the elevating device,
The air hose is a first air hose disposed between the trough and an upper portion of the trough frame;
A second air hose having a smaller diameter than the first air hose arranged between the trough and the upper portion of the trough frame so as to be in a vertical arrangement with the first air hose;
A third air hose disposed between the trough frame and a second support structure on the lifting device,
The backing device according to claim 1, wherein the first air hose, the second air hose, and the third air hose are individually controlled in internal pressure by a pressurizing device that puts compressed air into each.   A first support structure that supports the support frame; a lift frame that is disposed immediately below the second support structure that supports the trough frame; and a first backing member and a second that are disposed on the lift frame. The backing apparatus according to claim 1, further comprising: one flux collecting unit that collects the flux dropped from the backing member.   A first support structure part that supports the support frame, a lift frame that is disposed directly below the second support structure part that supports the trough frame, and a flux that is disposed on the lift frame and drops from the first backing member 2. The back of claim 1, further comprising: a first flux collecting unit that collects the first flux collecting unit, and a second flux collecting unit that is disposed on the elevating frame and collects the flux that is dropped from the second backing member. This device.   The backing device according to claim 1, further comprising a connecting portion that connects the first support structure portion that supports the support frame and the second support structure portion that supports the trough frame. The steel plate to be welded is moved to a corresponding position where the backing device according to any one of claims 1 to 10 is installed, and the back surface along the weld groove portion of the steel plate to be welded. A welding method for performing welding work by pressing the first backing member of the device,
In the backing device, the connecting member on the backing copper plate of the first backing member is a connecting bracket for mounting the copper plate piece at the position of the adjacent copper plate piece, and the copper plate mounted on the connecting bracket. A connecting pin that inserts and connects a piece with a through-hole formed in advance, and the connecting bracket forms a convex portion on its lower surface that can slide along the support frame,
The backing device is interposed between the trough in the second backing member of the backing device and a trough frame for fixing the trough, and is expanded by compressed air to weld the flux to the welded steel plate. A large-diameter air hose that presses against the lower surface of the groove portion, and has a large-diameter air hose in the expanded cross-section, and pushes up the used flux that has been expanded by compressed air, and a small-diameter air hose in the expanded cross-section from the large-diameter air hose,
Each of the air hoses interposed between the trough and the trough frame that fixes the trough has two air hoses with different cross-sectional dimensions arranged vertically,
A first step of raising a backing copper plate having a minimum length not less than the weld groove portion by a lifting device toward the weld groove portion of the steel plate to be welded;
The surface of the backing copper plate is inflated by injecting compressed air into a support frame that supports the backing copper plate raised by the lifting device and an air hose provided between the first support structure that supports the supporting frame. A second step of pressing the flux placed on the back surface of the weld groove,
And a third step of performing single-sided welding with a welding machine of the single-sided welding apparatus. The steel plate to be welded is moved to a corresponding position where the backing device according to any one of claims 1 to 10 is installed, and the back surface along the weld groove portion of the steel plate to be welded. A welding method for performing a welding operation by pressing a second backing member of the device,
In the backing device, the connecting member on the backing copper plate of the first backing member is a connecting bracket for mounting the copper plate piece at the position of the adjacent copper plate piece, and the copper plate mounted on the connecting bracket. A connecting pin that inserts and connects a piece with a through-hole formed in advance, and the connecting bracket forms a convex portion on its lower surface that can slide along the support frame,
The backing device is interposed between the trough in the second backing member of the backing device and a trough frame for fixing the trough, and is expanded by compressed air to weld the flux to the welded steel plate. A large-diameter air hose that presses against the lower surface of the groove portion, and has a large-diameter air hose in the expanded cross-section, and pushes up the used flux that has been expanded by compressed air, and a small-diameter air hose in the expanded cross-section from the large-diameter air hose,
Each of the air hoses interposed between the trough and the trough frame that fixes the trough has two air hoses with different cross-sectional dimensions arranged vertically,
A first step of raising a trough and a trough frame having a minimum length to the weld groove portion of the steel plate to be welded by using a lifting device;
The second backing member raised by the lifting device is expanded by injecting compressed air into a third air hose disposed between the trough frame and the second support structure portion on the lifting device to cause the trough to expand. A second step of bringing the welding groove portion close to or pressed against the back surface of the welding groove portion;
A third step of inflating the compressed air into the first air hose disposed between the trough and the trough frame to press the flux in the trough against the back surface of the weld groove;
And a fourth step of performing single-sided welding with a welding machine of the single-sided welding apparatus. After the one-side welding in the fourth step is finished, the first air hose and the third air hose are contracted, the lifting device is lowered, and then a second disposed between the trough and the upper portion of the trough frame. The welding method according to claim 12 , further comprising a step of expanding the trough by injecting compressed air into the air hose to push up the flux in the trough.

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