JP2001047229A - Welding method for buildup longitudinal by welding and equipment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a load of straightening work by decreasing a generation of a longitudinal bending, a chevron-shaped buckling, or a lateral bending in the production of a buildup longitudinal member by welding. SOLUTION: A fillet corner zone formed in a T-shape by butting vertically and in a longitudinal direction the bottom end side in the width direction of a web plate material 2 to a flange plate material 1 is tack-welded to compose them into a T-shape, then a regular welding of the fillet corner zone is executed by a gas shield arc welding in a longitudinal direction with a welding wire 4 supplied from a welding torch 3 furnished on a dual electrode welding equipment 10, followed by a continuous and linear heating in a longitudinal direction of a web plate material 2, at the upper end near the downstream side of the fillet corner zone which is regularly welded, from the both sides of the plate thickness direction of the web plate material 2, by a combustion flame of a heating gas burner 39, thus a longitudinal bending, a chevron-shaped buckling or a lateral bending of a T-shaped longeron member is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for temporarily welding a fillet corner formed in a T-shape by vertically abutting the lower end in the width direction of a web plate material to a fixed position in the width direction of a flange plate material in a longitudinal direction. After assembling into a shape, the fillet corner is continuously welded by gas-shielded arc welding in the longitudinal direction using a welding wire fed from a welding torch provided in a two-electrode welding machine, and a continuous welding is performed. The present invention relates to a method and an apparatus for welding a long material.

[0002]

2. Description of the Related Art When shipbuilding various ships such as large ships at a shipyard, a steel plate cut to a predetermined size is welded to build up an outer plate of the hull. The outer plate of the hull has a structure that reinforces the outer plate by welding longitudinal materials of various shapes such as T-shape and L-shape in the longitudinal direction on the back side thereof. For example, in FIGS. 14 and 15, a plurality of T-shaped longitudinal members A are welded to the bottom shell C in parallel in the longitudinal direction, and an L-shaped longitudinal member B is welded to the side shell D in the longitudinal direction. The case of reinforcement is shown.

[0003] Fig. 8 shows a layout example of a longe factory for manufacturing a longe material used for reinforcing a hull outer plate. The Longe factory has a frame planar 7, an NC marking device 8, an assembling machine 9, a two-electrode welding machine 10, a horizontal pulling trolley 11, a vertical pressing straightening machine 12, and a horizontal pressing straightening machine 13. The steel plate carried into the Longi factory is transferred to the NC marking device 8. T
In the case of manufacturing a mold long material, as shown in FIG. 9, the thick steel plate 14 serving as the base material is marked by the NC marking device 8 to a predetermined width and length, and then moved to the frame planar 7 to be cut by gas. The straight flange plate 1 and the web plate 2 are moved to a position above a transport roller and brought into the assembling machine 9. The straight flange plate 1 and the web plate 2 are long, and some are as long as 25 m.

[0004] In the assembling machine 9, the widthwise lower end of the web plate 2 is vertically abutted in a T-shape along the longitudinal direction from above at the center in the width direction of the horizontally placed flange plate 1. The position of the two-electrode welding machine 10 where the fillet corners are temporarily attached by gas shield arc welding at intervals in the longitudinal direction (for example, at 50 cm intervals) to be assembled in a T-shape and stand by the transport rollers. Transported to Subsequently, as shown in FIG. 10 (the heating burner 49 is not used here), the two-electrode welding machine 10 is attached to the thinned meat corner between the flange plate 1 and the web plate 2 placed on the stopped conveying rollers. A current is applied to the welding wire 4 fed from the center of the welding torch 3 while linearly moving the welding torch 3 provided with the welding torch 3 facing from both sides in the thickness direction of the web plate material, and the welding wire 4 and the corner part mother are moved. An arc 5 is generated between the material and main welding in the longitudinal direction. At this time, a carbon dioxide gas 6 is sent to the vicinity of the arc from an annular nozzle provided so as to surround the welding wire 4 fed from the center of the welding torch 3, and the weld is gas-shielded from the atmosphere to protect the T-shaped gas. Build up Longi material A.

[0005] As shown in FIG. 4, when the main welding by the two-electrode welding machine 10 mounted on the welding machine cart 16 is completed, the five T-shaped long materials A on the conveying rollers 15 are placed between the conveying rollers 15. It is moved laterally by a plurality of traversing chain conveyors 18 moving in a direction across the welding work floor. Further, the trolley 20 is moved by the traversing chain conveyor 19 of the trolley 20 waiting to the side and is loaded on the trolley 20. This is possible because
This is because, as shown in FIG. 5, the traversing chain conveyors 18 and 19 can move up and down between an operating position indicated by a solid line and a standby position indicated by a dotted line.

When the temporarily attached flange plate 1 and web plate 2 are moved by the transport roller 15 or when the fillet corner is welded, the traversing chain conveyor 18 descends below the welding work floor as shown by the dotted line. It is in the waiting state. When the T-shaped longitude material A after welding is moved from the welding location to the horizontal pulling trolley 20, the traversing chain conveyor 18 is raised to protrude above the level of the transport roller 15 to support the T-type longitude material A. I do. Then, the transverse chain conveyors 18 and 19 are moved in the direction of the arrow to move the T-shaped long material A laterally from the welding position onto the lateral carriage 20, and the lateral carriage 20 is moved.
Put on. In FIG. 4, reference numeral 21 denotes a rail on which the welding machine truck 16 travels, and reference numeral 22 denotes a rail on which the horizontal pulling truck 20 travels via wheels 51.

[0007]

In the T-type long metal material A, when the butted corners are arc-welded, the plate material is locally heated to a high temperature by welding heat and temporarily expands. A large shrinkage action is caused by the temperature drop of. For this reason, when the T-type longitude material A returns to the normal temperature, it causes the vertical bending deformation in the vertical direction shown in FIG. 11 and the umbrella bending deformation of the flange shown in FIG. The following lateral bending deformation occurs. In particular, since the T-shaped long material A is apt to cause vertical bending, and the amount of vertical bending Y reaches 150 to 300 mm, there is a high danger that the T-shaped long material A will fall when the traversing chain conveyor 18 is raised. For this reason, the horizontal pulling trolley 20 cannot be used, and the T-shaped long material A is
It has been necessary to lift the books one by one and carry them out to the next process, which has led to a reduction in the carrying out work efficiency.

[0008] If a longitudinal bend, umbrella break or lateral bend is present in the T-shaped long material A that has been built up by welding, it cannot be used for reinforcing the outer plate of the hull, so it is necessary to correct the bend to an allowable range. The longitudinal bending and umbrella bending of the T-type longitude material A are corrected using a vertical pressing straightener, and the horizontal bending is corrected using a horizontal pressing straightener. As shown in FIG. 6, the vertical press straightening machine includes a crown roll 23 located on the lower side and a pair of uniaxially-supported inwardly-facing inwardly-moving conical rolls 24 located on the upper side. The longitudinal bend is corrected by passing the T-shaped longitudinal material A, which is slightly bent and slightly bent, between the and the pair of conical rolls 24 and pressing the flange plate material 1 from above and below.

[0009] Further, as shown in FIG.
This is a combination of one fixing member 25 and two lateral pressing members 26. The central fixing member 25 and the lateral pressing members 26 separated on both sides are arranged to face each other. The laterally bent portion is pulled in, the drive cylinder 26a is operated in a stationary state to advance the lateral pushing member 26, and the lateral bending is corrected by the bending action with the fixing member 25. The T-type longitude material A that has been subjected to the vertical bending correction, the horizontal bending correction, and the like is finally finished by heating and correcting a small local bent portion using a heating burner (see FIG. 9).

The amount of longitudinal bending Y generated in the T-shaped long material A is 20
When it reaches 0 to 300 mm (see Fig. 11), it cannot be straightened easily by the vertical press straightening machine.
It was necessary to go back and forth, causing a significant drop in productivity. The same was true for the case where the lateral bending was remarkable. The present invention solves the above-mentioned problems of the prior art, and reduces the occurrence of vertical bending, umbrella breakage, or horizontal bending when manufacturing a welded built-up longe material as much as possible, and reduces the load of straightening work. It is an object of the present invention to provide a method and an apparatus for welding a welded build-up material which can be reduced.

[0011]

According to a first aspect of the present invention, there is provided a T-shape in which a widthwise lower end of a web plate is vertically butted in a longitudinal direction at a fixed position in a widthwise direction of a flange plate. After temporarily filling the fillet corner formed in the above to assemble it into a long shape, the fillet corner is
In a welding method of a welding built-up longe material in which a gas shielded arc welding is performed in a longitudinal direction by a welding wire fed from a welding torch provided in an electrode welding machine and the main welding is continuously performed, the welding is performed following the main welding. Meanwhile, the upper end of the web plate near the downstream side of the fully welded fillet corner is continuously linearly heated in the longitudinal direction by a heating gas burner from both sides in the thickness direction of the web plate. This is a method for welding a built-up weld material.

According to a second aspect of the present invention, the heating burner is disposed so as to face the upper end of the web plate.
2. The guide is guided by a guide rod of a book.
It is a welding method of the welding built-up longe material described. The present invention according to claim 3 comprises a combination of a welding machine truck equipped with a two-electrode welding machine and a heating burner truck traveling on the downstream side of the welding machine truck, and a portal frame provided on the heating burner truck. A pair of heating burners and two guide rods supported at a tip end of a burner support pipe provided at the upper end of the rear end in a width direction in a width direction, a burner support pipe provided at a position adjustable to the guide rods, A limit switch supported on a distal end of a support rod slidably provided downward on a guide rod and provided with a limit switch.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS.
The two-electrode welding machine 10 is mounted on a portal frame 27 provided on a welding machine cart 16 traveling on wheels 21 via wheels 17. Welding using a two-electrode welding machine 10 in a state where five straight flange plates 1 and web plates 2 temporarily assembled and assembled in a T-shape are placed on a transport roller 15 while being separated from each other by five in parallel. explain. A traversing chain conveyor 18 is provided between the transport rollers 15. The same two-electrode welding machine as the conventional one is used, except that five sets of pairs of welding torches 3 arranged on the rear side of the portal type gantry 27 in the traveling direction indicated by arrows are provided with five pairs.
It faces the fillet corner of the temporarily attached flange plate 1 and web plate 2. The pair of welding torches 3 is raised and lowered by a lifting device 28, and the position of each welding torch 3 with respect to the fillet corner is adjusted by a left and right copying device 29 and a vertical copying device 30. A welding power source 43, a wire pack 44, and the like are provided on the portal gantry 27.

In the present invention, the heating burner truck 32 is made to follow the rail 21 from the rear of the welder truck 16 on which the two-electrode welding machine 10 is mounted via wheels 20. The heating burner cart 32 is provided with a portal frame 33, and a guide rod 34 is provided horizontally in the width direction on the portal frame 33. The guide rod 34 has a sliding member 35 and a sliding member. 36 are slidably arranged in the horizontal direction alternately in units of five. Each slide member 35 is provided with a burner support pipe 37 so as to adjust the tilt angle and height downward, and furthermore, the burner support pipe 37
A pair of heating burners 39 branching at the distal end thereof are supported to face each other, and two guide rods 42 hang slightly upstream of the heating burner 39. Further, a support rod 38 is provided on each sliding member 36 so as to adjust the inclination angle and height downward, and a limit switch 40 is attached to a tip end portion thereof via a holder 41.

The sliding member 35 and the sliding member 36 are supported so as to be movable in the horizontal direction (the left-right direction in FIG. 2) along the guide rod 34. For example, the sliding member 35 is connected to the sliding member 35 via a burner support pipe 37. The limit switch 40 supported by the holder 41 via the pair of the supported heating burners 39 and the sliding member 36 via the support rod 38 can be moved from the dotted line position to the operating position indicated by the solid line. In addition, each burner support pipe
A propane gas supply hose 45 and an oxygen gas supply hose 46 are connected to the upper end of 37. Propane gas supplied from a propane gas supply source is guided to a pair of heating burners 39 via a propane gas supply hose 45 and a propane gas passage provided in a burner support pipe 37. Oxygen gas supplied from the oxygen gas supply source is supplied with an oxygen gas supply hose.
The gas is also supplied to a pair of heating burners 39 via an oxygen gas passage provided in the burner support pipe 37.

The procedure for welding a built-up welded weld material of the present invention will be described. The welding machine bogie 16 is stopped at the welding start end of the five temporarily fixed straight flange plate members 1 and the web plate member 2 waiting on the transport roller 15, and the flange plate member 1 and the web plate member 2 are welded to the butt corner. The torch 3 is positioned. A heating burner truck 32 is kept on standby on the rail 21 behind the welding machine truck 16 on which the two-electrode welding machine 10 is mounted.

A pair of welding torches 3 are moved from the opposite sides of the welding torch 3 linearly in the direction of the arrow by the traveling of the welding machine truck 16 from the both sides. Facing the welding start end, portal frame
The welding wire 4 drawn from the wire pack 44 disposed on the top 27 is continuously fed from a feeding roll 47. The welding wire 4 (1.2 mm) fed from the center of the welding torch 3
φ) welding power supply 43 (AC3φ220V, 60Hz, rated input 290KV)
The electric current supplied from A) is passed to generate an arc 5 between the welding wire 4 and the corner portion base material. A carbon dioxide gas 6 is sent to the vicinity of the arc from an annular nozzle provided so as to surround the welding wire 4 fed from the center of the welding torch 3, and the welding is continuously performed by gas shielding the weld from the atmosphere.

The sliding member 35 and the sliding member 36 provided on the guide rod 34 provided on the following heating burner truck 32 are temporarily attached to the positions of the flange plate 1 and the web plate 2 in the width direction. Match. The height and height of the pair of heating burners 39 are adjusted by adjusting the inclination angle and height of the burner support pipe 37 so as to fall within a range of 20 to 50 mm from the upper end of the web plate 2. The web plate 2 is positioned between the two. Further, the inclination angle and height of the support rod 38 are adjusted so that the limit switch 40 is adjusted to an intermediate position in the height direction of the web plate 2 where the limit switch 40 is not exposed to a high temperature.

While the fillet corner is permanently welded from both sides in the thickness direction of the web plate material in the longitudinal direction, a heating burner truck 32 follows the rail 21 at a predetermined speed from behind the welding machine truck 16. The traveling speed of the heating burner truck 32 does not necessarily need to match the traveling speed of the welding machine truck 16,
Priority is given to reducing vertical bends and the like. When the limit switch 40 of the support rod 38 provided on the heating burner truck 32 detects the leading end (downstream end) of the web plate material 2, the propane gas supply source and the oxygen gas supply source supply the propane gas to the pair of heating burners 39. And supply of oxygen gas is started. Thus, the propane gas ejected from the pair of heating burners 39 is burned by the oxygen gas, and the upper end of the web plate 2 is linearly heated from both sides continuously by the generated flame.

As a result, the lower portion of the web plate material 2 and the upper portion of the web plate material 2 which are locally heated to a high temperature by the main welding are thermally balanced, so that the longitudinal bending, umbrella bending or horizontal bending of the T-shaped long material A is prevented. Reduced. Main welding of the butted corner portion of the flange plate material 1 and the web plate material 2 and the heating of the upper end of the web plate material 2 are continued, and the limit switch
When it is detected that 40 has passed the last end (upstream end) of the web plate material 2, the supply of the propane gas and the oxygen gas is stopped, and the heating of the web plate material 2 by the pair of heating burners 39 is terminated.

As shown in FIG. 10, in order to reduce the equipment cost, as shown in FIG. 10, the support member 48 is provided with one heating burner 49 vertically downward and a web device using a heating device provided with two guide rods 50. An experiment of heating the plate material 2 was performed. in this case,
The support member 48 is horizontally moved in the direction of the arrow with the upper end of the web plate 2 interposed between two guide rods 50 provided downward on the support member 48 to guide the gas burner 49 for heating. The combustion flame ejected downward from the heating gas burner 49 collides vertically with the upper surface of the web plate material 2 to continuously heat it. When the heating burner 49 is single, the upper part of the web plate 2 is heated and heated more efficiently than when the heating burner 39 is double as in the example of the present invention based on FIGS. However, the effect of reducing the longitudinal bending, the lateral bending and the like of the T-shaped long material A was small. It has been found that it is important to heat the upper part of the web plate material 2 from both sides in the thickness direction of the web plate material by a pair of heating burners 39 as in the present invention. Hereinafter, the test results are shown.

Table 1 shows the case where the heating burner 49 is made single and the upper end surface of the web plate 2 is vertically heated by a combustion flame. Table 2 shows that the heating burner 39 is made double and the upper end of the web plate 2 is formed. The size of the test material, the pressure of the gas used for the heating burner, and the size of the web material 2 when heating by a combustion flame substantially horizontally from both sides in the thickness direction of the web material.
, A vertical bending amount, a vertical bending rate, a vertical bending correction time, and the like. In Tables 1 and 2, F indicates a flange,
W indicates a web.

[0023]

[Table 1]

[0024]

[Table 2]

A comparison of Tables 1 and 2 shows that a single heating burner 49 is provided on the upper portion of the T-type long plate 2 having a flange F, a web W and a length substantially similar or the same size. The heating rate can be increased to 50 cm / min in the case of heating with the heating burner 39 double as compared with the case of heating. This heating rate of 50 cm / min is 50 times of the actual welding speed by welding torch 3.
Since the speed is almost the same as cm / min, it not only enables efficient heating following the welding by the welding torch 3, but also significantly reduces the amount of vertical bending, the vertical bending rate and the correction time of the T-shaped long material. You can see what you can do. The heating temperature shown in Table 2 indicates the measured temperature 500 mm behind the double heating position by the heating burner 39. Although it is difficult to directly measure the temperature of the part heated by the heating burner 39, the temperature of the part is estimated to be about 600 to 700 ° C. Does not happen. Care must be taken when the temperature of this part exceeds 950 ° C, as there is a risk of material change.

Table 3 shows a comparison between a conventional example in which the upper portion of the web plate material is not heated by the heating burner and an invention example in which the upper portion of the web plate material is heated by the heating burner when the T-type long material is manufactured.

[0027]

[Table 3]

As shown in Table 3, it can be understood that the longitudinal bending can be greatly reduced according to the invention example as compared with the conventional example.
As described above, according to the present invention, the longitudinal bending of the T-shaped long material can be greatly reduced, so that the T-shaped long material can be moved by the traversing chain conveyors 18 and 19. This allows the horizontal carriage
Vertical press straightening machine for T-type longi materials using 20, 12 horizontal press straightening machine
Since it can be transported to 13 or the like, reduction in transport cost is achieved. The amount of longitudinal bending that occurs in T-shaped long materials is 140 to 30
Since the 0mm level can be suppressed to about 40-80mm, the vertical press straightening machine
It is possible to reduce the number of twelve corrections to one, thereby increasing productivity.

Table 4 shows a comparison of required man-hours (hours) for each stage from cutting, assembling, welding and straightening when the conventional method and the method of the present invention are carried out.

[0030]

[Table 4]

As shown in Table 4, according to the present invention, the man-hours of the welding and straightening stages are remarkably reduced, and not only the vertical bending, which frequently occurs, but also the horizontal bending and umbrella bending can be reduced. It was possible to reduce the total man-hours by 0.26 hours to manufacture one T-shaped long material compared to the conventional one, and the man-hour reduction when the number of production was large was great.

In the above-mentioned embodiment, the case where the present invention is applied to a T-type long material is described. However, the present invention can be applied not only to a T-type long material but also to various long materials such as an L-type long material. It is.

[0033]

As described above, according to the present invention,
In manufacturing the welded build-up long material, while temporarily welding the temporarily welded fillet corner in the longitudinal direction from both sides,
Since the upper end of the web material near the downstream of the welded fillet corner is continuously linearly heated in the longitudinal direction by a heating gas burner from both sides, the longitudinal material bends.
Umbrella breakage and lateral bending deformation can be greatly reduced. As a result, it is possible to reduce the cost of transporting the longe material, reduce the man-hours required for welding and straightening, and achieve a significant cost reduction of the welded build-up longe material.

[Brief description of the drawings]

FIG. 1 is a side view showing a welding built-up long material welding apparatus using a combination of a welding machine cart and a heating burner cart according to the present invention.

FIG. 2 is a front view showing a heating burner truck equipped with the heating burner according to the present invention.

FIG. 3 is a front view of a welding machine truck equipped with the welding machine according to the present invention.

FIG. 4 is a plan view showing a transport roller, a traversing chain conveyor, and a traversing carriage near a conventional electrode welding machine.

FIG. 5 is a side view of a conventional traversing chain conveyor.

FIG. 6 is a front view showing a roll arrangement of a conventional vertical straightening machine.

FIG. 7 is a plan view showing the arrangement of a fixing member and a lateral pressing member of a conventional lateral bending straightener.

FIG. 8 is a plan view showing the arrangement of devices in a conventional longi factory.

FIG. 9 is an explanatory view showing a conventional manufacturing process of a longe.

FIG. 10 is a perspective view showing a state where a fillet corner between a flange plate and a web plate is welded with a welding torch and a state where a heating burner is heated vertically downward from the upper surface of the web plate.

FIG. 11 is a side view showing a vertical bending state of a T-shaped long material.

FIG. 12 is a front view showing an umbrella bending state of a T-shaped long material.

FIG. 13 is a plan view showing a lateral bending state of the T-shaped long material.

FIG. 14 is a side view showing a hull provided with a longitudinal member parallel to the longitudinal direction of the inner surface of the outer plate.

FIG. 15 is a sectional view showing the direction of arrow AA in FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flange board material 2 Web board material 3 Welding torch 4 Welding wire 5 Arc 6 Carbon dioxide gas 7 Frame planer 8 NC marking device 9 Assembly machine 10 2 electrode welding machine 11 Horizontal pulling trolley 12 Vertical press straightening machine 13 Horizontal press straightening machine 14 15 Conveyor roller 16 Welding machine carriage 17, 20, 51 Wheels 18, 19 Traversing chain conveyor 21, 22 Rail 23 Crown roll 24 Conical roll 25 Fixing member 26 Lateral pushing member 26a Drive cylinder 27, 33 Gate type gantry 28 Elevating device 29 Left and right Copying device 30 Vertical copying device 31 Wire pack 32 Burner cart for heating 34 Guide rod 35, 36 Sliding member 37 Burner support pipe 38 Support rod 39, 49 Burner for heating 40 Limit switch 41 Holder 42, 50 Guide rod 43 Welding power supply 44 Wire pack 45 Propane gas supply hose 46 Oxygen gas supply hose 47 Feeding roll 48 Support member

Claims (3)

[Claims] 1. The method according to claim 1, wherein the lower end of the web plate in the width direction is vertically abutted at a predetermined position in the width direction of the flange plate in the longitudinal direction.
After the fillet corner formed in the shape of a letter is temporarily welded and assembled into a long shape, the fillet corner is longitudinally shielded by a welding wire fed from a welding torch provided in a two-electrode welding machine. In the welding method for welding a built-up longe material which is welded and continuously welded, the upper end portion of the web plate material in the vicinity of the downstream side of the fully welded fillet corner portion while following the main welding. And a method of continuously and linearly heating the web plate material in the longitudinal direction from both sides in the thickness direction of the web plate material by a heating gas burner. 2. The method for welding a welded built-up long material according to claim 1, wherein the heating burner is guided by two guide rods arranged to face each other with an upper end portion of the web plate material interposed therebetween. . 3. A welding machine truck equipped with a two-electrode welding machine,
A guide rod horizontally provided in the width direction of a rear end upper portion of a portal type gantry provided on the heating burner trolley, comprising a combination with a heating burner trolley traveling on the downstream side of the welding machine trolley,
A pair of heating burners and a pair of heating burners supported at the tip of a burner support pipe provided on the guide rod so as to be adjustable in position;
A welding apparatus for welding a built-up weld material, comprising: a guide rod; and a limit switch supported on a distal end portion of a support rod provided slidably downward on the guide rod.