JPH10118771A - Vertical electro-gas welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently weld steel plates having a large thickness by invading the tip part of a first electrode into a beveling, successively, invading the tip part of a second electrode into an opening hole side of the beveling and welding. SOLUTION: The tip part of the first electrode T1 is deeply invaded into the bevelings on the steel plates WR to be welded. The tip part of the second electrode T2 is invaded at the position near the opening hole side of the beveling from the tip part of the first electrode T1. A shaking means E shakes the first and the second electrodes in the plate thickness direction of the steel plates WR. A carrier 100 is fitted to a rail L parallel fixed to the surfaces of the steel plates WR, and the first and the second electrodes are shifted in the longitidinal direction of the bevelings on the steel plates WR through the shaking means E. Since the heat is inputted at the deep side and the opening hole side in the beveling part, the temp. distribution is uniformized. Negative welding voltage to the steel plates WR is impressed to the first electrode. Positive welding voltage is impressed to the second electrode. Arc of the first electrode having straight polarity is good to melting of the bottom part of the beveling. Arc of the second electrode having reversed polarity has high concentration, and the interference between the first and the second electrodes is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vertical electrogas welding apparatus.

[0002]

2. Description of the Related Art As a vertical automatic welding method, electrogas welding is mainly used for welding steel walls such as shipbuilding, cylindrical oil storage tanks, steel frames, bridges, heavy electrical equipment, and steel making machines. The efficiency is higher when the heat input is increased by increasing the voltage and current in electrogas welding, but the notch toughness of the weld metal and base metal heat-affected zone is high when welding high strength steel due to the large heat input. It causes deterioration.

[0003] In particular, recently, there has been a tendency for low heat input welding to be strongly required in order to maintain the soundness of the heat-affected zone. Electro-gas welding, in which the arc point is moved, is suitable for vertical welding of a steel wall because the groove welding with a reduced groove cross-sectional area can be performed with low heat input and high efficiency.

[0004] An outline of an apparatus for performing such electro-gas welding will be described below. The back side of a groove (extending in the vertical direction (vertical direction) z) between two vertically standing and adjacent steel plates is sandwiched by a glass tape. Fix the natural air-cooled or water-cooled copper abutment, apply a water-cooled sliding copper abutment on the front side, and weld to the space surrounded by the groove (facing the groove) and the groove A flat curved tip (a tip of a welding torch) is inserted and a small-diameter flux-cored wire is continuously supplied to the space through the curved tip while vibrating the tip at a high speed in the thickness direction x. -While continuously driving the buried tip (welding torch) and the sliding copper plate upward (z),
Perform vertical welding of the groove.

[0005] The welding torch, the torch vibrator and the sliding copper abutment are mounted on a welding bogie which automatically switches between high speed and low speed as the welding progresses and rises while controlling the speed. Carbon dioxide gas is used as the shielding gas, and the gas is fed into the groove space from a nozzle provided above the sliding copper abutment, and the welding torch is vibrated in the thickness direction x of the steel sheet at a predetermined cycle. In this way, the beveled end is welded without defects, and at the same time, a synergistic effect of high-speed vibration and continuous feeding of a small-diameter flux-cored wire provides a beautiful bead appearance with a very fine waveform (Japanese Patent Publication No. 54-148155). Gazette, JP-B-63-66634, and JP-B-1-222067).

[0006]

The depth of the groove (thickness of the steel plate) to which such vertical electrogas welding can be applied is up to about 60 mm. Partial penetration failure is likely to occur, such as poor penetration at the edge of the part.

A first object of the present invention is to weld a steel plate having a large thickness without poor penetration, and a second object to perform the welding efficiently.

[0008]

[Means for Solving the Problems]

(1) A flux-cored wire (w1, w) is inserted into a groove (α) extending in the vertical direction (z) of a steel plate (WL, WR) that is substantially vertically erected.
2) The vertical electrogas welding apparatus of the present invention for welding in the upward direction (z) while supplying the first electrode (T1) whose tip enters the groove (α); α), the first electrode (T1)
A second electrode (T2) that enters a position closer to the groove opening side in the thickness direction x of the steel sheet than the tip of the steel; a trolley (100) including a drive motor for running and rising along the groove (α) And the first and second electrodes (T1, T2) supported by the cart (100);
A vibrating means (E) for swinging and driving in the thickness direction x. In addition, in order to facilitate understanding, symbols of corresponding elements or corresponding items in the embodiments shown in the drawings and described later are added for reference in parentheses. According to this, bevel
Since heat is input to the molten pool through an arc at two points in the depth direction (x) of (α), that is, at the back side and the opening side of the groove,
The temperature distribution becomes uniform in the groove cross section. Further, since the vibration means (E) drives the first and second electrodes (T1, T2) to swing in the thickness direction x, the temperature distribution in the groove depth direction (x) is further uniformed, and Extremely thick steel having a thickness exceeding 60 mm can also be welded with relatively uniform penetration. In addition, as a matter of course, the welding speed is about twice that in the case of using one electrode, and the welding operation efficiency is improved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(2) a first welding power supply (20) for applying a negative welding voltage to the first electrode (T1) to the steel plate; and a second welding power supply for applying a positive welding voltage to the second electrode for the steel plate; Is provided. As a result, the first electrode (T1) performs positive arc welding and the second electrode performs reverse polarity arc welding. In the arc welding of positive polarity, the arc spreads and the penetration is wide and shallow, so that the arc reaches the bottom of the groove sufficiently, and the penetration at the bottom becomes good. On the other hand, since the arc of the opposite polarity has a high arc concentration, it is convenient to avoid interference between the arcs of the two electrodes.

A flux-cored wire is fed through each electrode toward the molten pool and melted by the arc, whereby molten metal and molten slag are sequentially supplied to the molten pool, and the molten metal is opened. Filling the tip, the molten slag on the molten pool, the sliding copper cover covering the opening of the groove rises as the welding progresses, the sliding copper cover and the welding bead in order. And solidifies on the weld bead and is consumed by it. However, since the arc partially blocks the flow of the molten slag, the molten slag thickness (depth) is reduced. Thicker (deeper) on the back side than the opening side of the groove. In the case of using two electrodes as in the present invention, the arc (second arc) generated between the welding wire fed through the second electrode (T2) on the opening side of the groove and the melting pool. -H) acts to suppress the movement of the molten slag on the back side to the opening side, so that the molten slag thickness tends to be thick on the back side. The slag spatter is generated by the arc, and when the thickness of the molten slag is large, the slag spatter is strong and the probability of adhering to the nozzle tip increases. Before starting welding, remove the spatter attached in the previous welding work or replace the nozzle tip,
When the spatter adhesion probability of the nozzle tip increases, this work increases and the work efficiency decreases.However, according to the present embodiment in which the slag spatter is small in positive polarity arc welding, the back side has positive polarity, The generation of slag spatter on the back side where slag spatter is likely to occur is suppressed, and in addition to the above-described uniform penetration, an effect of suppressing a decrease in work efficiency is also obtained.

(3) There is further provided means (J) for adjusting the distance in the thickness direction x between the first electrode (T1) and the second electrode (T2).
According to this, the distance (between the electrodes) between the two electrodes is adjusted so that the penetration at each part of the groove has a desired distribution according to the cross-sectional shape (depth, width) of the groove. sell.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0013]

FIG. 1 is a plan view showing an embodiment of the present invention. In FIG. 1, the direction perpendicular to the paper surface from the back surface to the front surface is defined as the upward direction of the vertical direction (vertical direction) z, the direction indicated by the arrow y is defined as the left direction of the horizontal horizontal direction (left and right direction) y, and the arrow The direction indicated by x is the front direction of the plate thickness direction x.
That is, FIG. 1 is a diagram in which the present embodiment is viewed from above,
FIG. 2 is a rear view seen from a direction indicated by a chain line 2A in FIG.
FIG. 3 shows a left side surface viewed from a direction indicated by a chain line 3A in FIG. Hereinafter, in each figure, the direction indicated by the arrow z is the upward direction,
The direction indicated by the arrow y is the left direction, and the direction indicated by the arrow x is the near side (the opening side of the groove / the direction opposite to the direction indicated by the arrow is the back side).

The steel plate which is set up vertically includes a left vertical plate WL and a right vertical plate WR, and a right edge of the left vertical plate WL has
The left edge of the right vertical plate WR faces each other, and a groove α is formed between both plates. Right end face of left vertical plate WL and right vertical plate WR
Has a wide opening width at the position of a flat plate surface (hereinafter referred to as a surface) facing the first and second welding torches T1 and T2 in the x direction. .

In this embodiment, a flat rail L is fixed to the surface of the right vertical plate WR in a vertical and parallel manner to the surface of the right vertical plate WR. A truck 1 is attached to this rail L
00 is attached.

1. Rail L and structure for supporting it L is a rail stand L fixed to its upper end.
s and a rail stand (not shown) of the same type fixed to the lower end and fixed to the right vertical plate WR. Referring to FIG. 1, the rail stand Ls has a structure in which supporting arms Ls3a and Ls3b are vertically fixed to the surface of an aluminum plate Ls1 and magnets Ls2a and Ls2b are fixed to the back surface. Is attracted to the right vertical plate WR, so that the aluminum plate Ls1 is connected in parallel to the right vertical plate WR, and the supporting arm Ls3 is attached to the right vertical plate WR.
a, Ls3b is upright. The rail L is supported in parallel to the aluminum plate Ls1 by the supporting arms Ls3a and Ls3b, and is parallel to the right vertical plate WR. A rack La extending parallel to the rail L is fixed to the rail L.
The side end surface of the rail L has a mountain shape (FIG. 1) in order to define the position of the wheels of the truck 100 in the x direction.
The left / right rollers 101 and 102 supported by the reference numeral 0 sandwich the rail L. When the rail L is long, one or more rail stands having the same structure are further fixed between the upper and lower rail stands Ls. 2. Cart 100 The cart 100 has a pinion 103 that meshes with the rack La of the rail L, and an elevating drive motor (not shown) inside the cart 100 is connected to the pinion 10 via a speed reducer (not shown).
When 3 is driven to rotate, it moves upward (up) along the rail L.
Or move down (down).

3. Torch y-direction adjustment mechanism A Please refer to FIGS. 1 and 2. The truck 100 has a knob a
1 and a gear mechanism (not shown) inside the carriage 100 connected thereto, and a slide bar a2 (FIG. 2) connected to the gear mechanism and supported by the carriage 100 so as to be slidable in the y direction.
There is a y-direction adjustment mechanism A consisting of The gear mechanism inside the carriage 100 converts the rotation of the knob a1 into the movement of the slide bar a2 in the left-right direction (y direction). That is, when the knob a1 is turned in the direction of the right-hand screw, the slide bar a2 is rotated via the gear mechanism.
Moves to the right. When the knob a1 is turned in the direction opposite to the direction of the right-handed screw, each element acts in reverse, and the slide bar a2 moves to the left.

A base c3 of a torch z-direction adjusting mechanism C is fixedly supported by a connector ac fixed to the left end of the slide bar a2. As the slide bar a2 moves in the y direction, the z-direction adjusting mechanism C also moves in the y-direction (y-position adjusting of the torches T1, T2 by the y-direction adjusting mechanism A).

4. Torch z-direction adjusting mechanism C A torch z-direction adjusting mechanism C has a base c3 through which a rotating shaft c2 extending in the z-direction is rotatably penetrated and protrudes from the upper surface of the base c3. A knob c1 is fixed to the upper end of the rotating shaft c2. Inside the base c3, the peripheral surface of the rotating shaft c2 is a screw, and a slider (not shown) is screw-connected. An arm extending leftward is fixed to the slider,
The left end of the arm projects from a slit (not shown) cut in the left direction of the base c3 in the z direction and is guided along the slit in the z direction. When the knob c1 is turned in the right-hand direction, the slider screwed to the rotating shaft c2 and the arm fixed thereto are guided by the slit cut on the left side of the base c3 and are driven upward. You. When the knob c1 is turned in the direction opposite to the right-handed screw, the slider screwed to the rotary shaft c2 and the arm fixed thereto are guided by the slit and driven downward.

At the tip of the arm of the torch z-direction adjustment mechanism C, a torch x-direction adjustment mechanism D described later is supported. Therefore, by rotating the knob c1 in the right-handed screw direction or in the opposite direction, the x-direction adjusting mechanism D (torch T1, T2) can be driven up or down, and the torch T1, The position of T2 in the z direction can be adjusted.

5. Torch x-direction adjustment mechanism D The torch x-direction adjustment mechanism D is the same mechanism as the “torch z-direction adjustment mechanism C”, and the “torch z-direction adjustment mechanism C” is referred to as xz. 9 so that the knob is on the back
It has been rotated 0 degrees. When the knob d1 is turned in the direction of the right-hand screw, the slider screwed to the rotating shaft d2 extending in the x direction and the arm extending to the left fixed to the slider are cut on the left side surface of the base d3. The guide is guided by a slit extending in the x direction, and is driven in a direction before the groove. When the knob d1 is turned in the direction opposite to the right-hand screw, the rotation axis d
The slider screw-connected to 2 and the arm fixed to the slider are guided by the slit and driven to the back of the groove.

The tip of the arm of the torch x-direction adjusting mechanism D has an oscillating drive for swinging a torch described later in the x direction.
A mechanism E is fixedly supported. Therefore, by rotating the knob d1 in the right-handed screw direction or in the opposite direction, the torch oscillator mechanism E (torch T1, T2) is moved toward the front of the groove, or the torch is moved. The torch can be moved to the rear side, and the position of the torch in the x direction can be adjusted.

6. Torch oscillating mechanism E See also FIG. A base e1 of an oscillating mechanism E is fixed to the arm of the torch x-direction adjusting mechanism D. The oscillating mechanism E extends an electric motor (not shown) and its rotation in the x direction, and its front end is a base.
A supporting arm e2 slidably penetrating the front surface of the sleeve e1;
A vibration mechanism (not shown) for converting the movement into the forward and backward movements in the x direction is built in. At the front end of the support arm e2, a fixed plate f1 of the torch entry angle adjusting mechanism F is mounted.

[7] Torch approach angle adjusting mechanism F Fixed plate f1 supported by oscillating mechanism E includes:
There is an arc-shaped guide groove f1a (FIGS. 2 and 3). Fixed press
The adjustment plate f2, which is a substantially triangular flat plate, is in surface contact with the plate f1. Angle adjusting screw f2a with knob at tip
Has a small diameter thread at the tip, and this thread is
It passes through the guide groove f1a of the fixed plate f1 and is screwed into the screw hole of the adjustment plate f2. By this screwing, the adjusting screw f2a tightens the adjusting plate f2 to the fixed plate f1, so that the adjusting plate f2 is fixed to the fixed plate f1. On the left side of the adjustment plate f2, a support member f2b extending leftward is set up.

8. Torch left / right angle adjustment mechanism G At the left end of the support member f2b set on the adjustment plate f2, the upper end of the support plate g2 of the torch left / right angle adjustment mechanism G is provided with a pin g2a ( It is supported rotatably around (FIG. 2). An elliptical guide groove g2b (FIGS. 2 and 3) extending in the longitudinal direction with respect to the side surface of the support plate g2 penetrates the support plate g2.
1a passes. The screw rod g1a has a knob g1 fixed to the left end and a screw at the right end. The threaded portion at the right end of the threaded rod g1a is screwed to a threaded hole f2d (FIGS. 1 and 2) formed above the adjustment plate f2.

At the tip of the support plate g2, a first welding torch T
1 is supported by a first torch holding member h1. When the knob g1 is rotated in the direction of the right screw, the support plate g
2 rotates about the pin g2a (FIG. 2) in the direction approaching the adjustment plate f2, and the first torch holding member h1 is rotated.
(First welding torch T1) rotates counterclockwise in FIG. Further, the second welding torch T is connected to the first torch holding member h1 via the connecting member h3 and the gap adjusting mechanism J.
A second torch holding member h2 for holding the second torch 2 is supported, and the second torch holding member h2 (the first torch holding member h2) is supported by the rotation of the first torch holding member h1 (the first welding torch T1). 2 welding torch T2) rotates counterclockwise in FIG. A resilient spring g1b is provided between the adjustment plate f2 and the support plate g2.
Is inserted, and the threaded rod g1a passes through the center of the repulsion spring g1b. Therefore, when the knob g1 is rotated in the direction opposite to the direction of the right-handed screw, the lower end of the support plate g2 is pushed by the repulsive force of the repulsion spring g1b from the adjustment plate f2 around the pin g2a (FIG. 2). Rotate away from the first
The torch holding member h1 (first welding torch T1) and the second torch holding member h2 (second welding torch T2) rotate clockwise in FIG. 9. First and second welding torch support mechanism H The first torch holding member h1 is provided between a plate member fixedly supported at the lower end of the support plate g2 and another plate member hinged to the plate member. The first torch T1 is clamped. The handle h1a locks and releases the holding of the torch. The handle h1a is rotated to release the lock, and the first welding torch T1 can be removed from the first torch holding member h1.

A connecting member h3 is fixed to the plate-like member of the first torch holding member h1 fixedly supported at the lower end of the supporting plate g2, at the front lower side thereof. Further, a gap adjusting mechanism J is supported by the connecting member h3, and the second torch holding member h2 is supported by the gap adjusting mechanism J. The second torch holding member h2 is of the same type as the first torch holding member h1, but when the first torch holding member h1 is parallel to the xz plane and the hinge joint is directed to the left. (FIG. 2), the second torch holding member h2 is parallel to the xy plane and the hinge joint is directed downward (FIG. 2). The second torch holding member h2
Has a second torch T2 sandwiched between a plate member supported by the gap adjusting mechanism J and another plate member hinged to the plate member. The handle h2a locks and releases the holding of the torch. The lock is released by turning the handle h2a, and the second welding torch T2 can be removed from the second torch holding member h2.

10. The gap adjusting mechanism J The gap adjusting mechanism J is supported by the connection member h3. y
The other end of the rotating shaft extending in the direction and having a knob j1 at its tip enters a box-shaped base j2 of the gap adjusting mechanism J and is rotatable. A slit extending in the x direction is opened on the lower surface of the base j2. Base j of gap adjustment mechanism J
A pinion (not shown) is fixed to the tip of the rotating shaft that has entered the second shaft 2, and a rack (not shown) that extends in the x direction and slides in the direction engages with the pinion. The rack is provided with a downwardly extending arm.
The tip of the drum projects from a slit extending in the x direction on the lower surface of the base j2, and a second torch holding member h2 is fixed to the slit. By rotating the knob j1, the base
The pinion inside the gear j2 rotates, the rack meshing with the pinion slides in the x direction, and the second torch holding member h2 fixed to the rack by an arm moves in the x direction, thereby causing the second torch to move. The second welding torch T2 supported by the holding member h2
Approach the first welding torch T1 or move away from the first welding torch T1. That is, the gap can be adjusted.

(11) Referring to FIG. 2, the bogie 100 is provided with an x-direction drive mechanism B for copper aluminium. The x-direction drive mechanism B supports the spline shaft b3, and determines the y position of the spline shaft b3 by turning the knob b1 via the drive mechanism in the base b2. A support member b4 is fixed to the spline shaft b3, and a pressing mechanism K for pressing copper is supported by a support member b5 fixed to the support member b4.

12. Pressing mechanism K of copper abutment The pressing mechanism K of copper abutment is supported by the support member b5 of the copper abutment x-direction drive mechanism B. FIG. 4A shows a longitudinal section of the pressing mechanism K indicated by a one-dot chain line 4A in FIG. 1, and FIG. 4B shows a section taken along line 4B-4b in FIG. 4A. . The sleeve k1 supported by the support member b5 has a boss k
5 is inserted and fixed integrally to the sleeve k1.
The boss k5 has a spline hole, into which a supporting arm k4 having a spline groove cut in the outer peripheral surface is inserted. The supporting arm k4 is movable in the y direction with respect to the boss k5. However, rotation is prevented. Sleeve k1
Is screwed with a protruding adjusting sleeve k2 having a knob k3. The compression coil spring k6, which supports the supporting arm k4 and is supported by the adjusting sleeve k2, projects from the sleeve.
The button k2 is pushed in a direction approaching the groove. Support arm k
4 has a sleeve k2 and a compression coil spring k6.
Is threaded, and the head of the threaded rod k4a prevents the support arm k4 from falling off the sleeve k1.

A support block k11 is mounted at the tip of the support arm k4 so as to be rotatable around a pin k9 extending in the z direction. The support block k11 holds the copper abutment P rotatably about a pin k12a extending in the y direction. Therefore, the copper abutment P can rotate about the z-axis and the y-axis with respect to the support arm k4. z
Rotation about the axis is performed by two copper plates P, WL and WR.
At the same time, and the rotation about the y-axis is
The copper abutment P is allowed to closely adhere to the x-direction inclination or undulation of the two vertical plates WL and WR.

When the knob k3 is turned clockwise, an adjustment thread is set.
The bus k2 enters the inside of the sleeve k1, and the support arm k4 is pushed to the left via the compression coil spring k6, whereby the copper abutment P comes into close contact with the two vertical plates WL and WR. When the knob k3 is further turned clockwise, the force of pressing the copper plate P against the two vertical plates WL and WR increases. When the knob k3 is turned counterclockwise, the pressing force becomes weaker, and when the knob k3 is further turned counterclockwise, the copper abutment P separates from the two vertical plates WL, WR.
Even when the knob k3 is turned clockwise to the limit of the screwing of the adjusting sleeve k2 with respect to the sleeve k1 when there are no vertical plates WL and WR in front, the head sleeve k4b of the screw bar k4a is adjusted by the adjusting sleeve. The support arm k4 does not fall off the boss k5 because it does not fall out of k2. Further, in this embodiment, the length of the screw rod k4a is equal to the length of the copper rod through the support arm k4 of the compression coil spring k6 when the right end face of the head k4b is flush with the right end face of the knob k3. P is two vertical plates WL, WR
Is 2 kk. By turning and adjusting the right end face of the knob k3 to be flush with the right end face k4b of the head k4b of the screw rod k4a, a pressing force of 2kk is always applied to the copper plate P.

13. On the surface (front surface) of the copper block p1 facing the vertical plates WL and WR, there is a groove extending in the z direction that regulates the surface bead shape. On the rear surface facing the front surface, there are two hose joints (for water injection and drainage) connected to the cooling water passage p1a in the copper block p1, and one of the hose joints jwa is shown in FIG. Have been done. The bead forming groove on the surface of the copper block p1 has an opening p2a to which the shield gas supply pipe p2 communicates. This gas supply pipe p2 is fixed obliquely to the copper block p1. Gas supply pipe p2
A hose joint jk is attached to the side of
Through this, the shield gas is supplied to the gas supply pipe p2.

Note that a solid backing material 40 made of ceramic (or may be copper) which prevents the molten metal and the molten slag from dripping is fixed to the back surface of the groove α of the vertical plates WL and WR. .

14. Welding procedure Using the mechanisms described above, the operator can move the first and second welding torches T1, T2 to the y-direction position (A), the z-direction position (C), the x-direction position (D), and the groove α. Angle (F) of the first welding torch T1 and the second welding torch T1
The distance (between the poles) between the switch and the switch T2 can be adjusted.
In addition, the position (B) of the copper plate P in the y direction is adjusted, and the vertical plate W
Press against R, WL. Thus, when the welding posture of the welding device is set, the operator starts welding.

FIG. 5 is a block diagram for supplying a voltage to the first and second welding torches T1, T2. When an operator gives an instruction to start welding via an operation panel (not shown), the power supply circuit 20 causes the welding torch T1 to have a positive polarity (torch T1: negative electrode, vertical plate W).
L, WR: positive voltage). The power supply circuit 10
Reverse polarity (torch T1: positive electrode, vertical plate W) to welding torch T2
L, WR: negative voltage). In addition, the first and second
Welding wires w1 and w2 are supplied to the welding torch at a constant speed by a wire supply device (not shown).

A current detection circuit 30 is interposed between the power supply circuit 10 and the vertical plates WL and WR. As the welding progresses, a molten metal is formed in the groove α, and a molten slag accumulates on the molten metal. If the z position of the welding torch does not move, molten metal and molten slag accumulate in the groove,
As the surface rises, the length of the wire protruding from the welding torch becomes shorter. The current detection circuit 30 detects that the surface of the molten metal (molten pool) has risen and the second welding
The formation of the molten pool and the rise thereof are detected by reducing the protruding length of the wire w2 of the tip T2 and increasing the current value between the power supply circuit 10 and the vertical plates WL and WR. Then, when the current value between the vertical plates WL and WR rises above a predetermined value, a rise instruction is issued to the bogie 100. And the cart 10
0 rises along the rail L in accordance with the rise instruction, and the tip of the second welding torch T2 separates again from the surface of the molten metal,
The projecting length of the wire w2 becomes longer, and the vertical plates WL, WR
When the current value during the period becomes equal to or less than the predetermined value, a stop instruction is issued to the carriage 100. By repeating this operation, the melting pool
The distance between the surface of the tool and the tip of the second welding torch T2 is substantially constant, and the protruding length of the wire w2 is substantially constant (35 to 40 mm in this example). 1st welding torch T1
Moves integrally with the second welding torch T2. Therefore, the distance between the molten pool and the tip of the first welding torch T1 becomes substantially constant, and the protruding length of the wire w1 is also increased. It is almost constant.

Here, the current detection circuit 30 is connected to the power supply circuit 10 for applying a voltage to the second welding torch T2 and the vertical plates WL and W.
The connection between R is because the second welding torch T2 generates an arc of reverse polarity, and the arc current value is more stable. FIG. 6 shows an example of welding conditions for electrogas welding by the above welding apparatus.

According to the above welding apparatus, welding is performed simultaneously with two welding torches. Therefore, even when a base material having a large thickness is welded, the penetration of each part of the groove is good and the welding speed is high. Work efficiency is good.

Further, by making the first welding torch T1 for welding the back side of the groove to have a positive polarity, the arc is spread, and the arc is sufficiently extended to the back of the groove. Good penetration can also be obtained at the bottom. In addition, there is little molten slag spatter, there is little spatter deposition on the nozzle tip, and there is no significant increase in the frequency of cleaning and replacement of the nozzle tip, and there is little decrease in work efficiency for that purpose.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention when viewed from above to below.

FIG. 2 is a rear view as viewed from a direction indicated by an alternate long and short dash line arrow 2A in FIG. 1;

FIG. 3 is a left side view as viewed from a direction indicated by an alternate long and short dash line arrow 3A in FIG. 1;

FIG. 4 (a) is viewed in the direction of arrow 4A shown in FIG. 2,
FIG. 4B is a longitudinal sectional view of the copper pressing mechanism K, and FIG. 4B is a cross-sectional view of the copper pressing mechanism K viewed in the direction of arrow 4B shown in FIG.

FIG. 5 is a block diagram showing a system configuration of the present invention.

6 is a table showing an example of welding conditions of electrogas welding by the welding device shown in FIG.

[Explanation of symbols]

α: groove 10: power supply circuit 20: power supply circuit 30: current detection circuit 40: solid backing material 100: trolley 101, 102: roller 103: pinion A: torch y-direction adjustment mechanism a1: knob a2: Slide rod ac: Connector B: Copper-metal x-direction drive mechanism b1: Knob b3: Spline shaft b4, b5: Support member C: Torch z-direction adjustment mechanism c1: Knob c2: Rotary shaft c3: Base torch D: Torch x-direction adjusting mechanism d1: Knob d2: Rotation axis d3: Base E: Torch oscillating mechanism e1: Base e2: Support arm F : Torch entry angle adjustment mechanism f1: Fixed plate f1a: Guide groove f2: Adjustment plate f2a: Angle adjustment screw f2b: Support member f2d: Screw hole G: Torch left / right angle adjustment mechanism g1: Knob g1a: Screw rod g1b: Resilient spring g2: Support plate g2a: Pin g2b: Guide groove H: First and second welding torch support mechanism h1: First torch holding member h1a: Handle h2: 2nd torch holding member h2a: Handle h3: Connecting member J: Adjustment mechanism between poles j1: Knob j2: Base K: Pressing mechanism for copper metal k1, k2: Sleeve k3: Knob Child k4: Support arm k4a: Screw rod k4b: Head k5: Boss k6: Compression coil spring k9: Pin k11: Support block k12a: Pin L: Rail La: Rack Ls: Rail stand Ls1: Aluminum Plate Ls2a, Ls2b: Magnet Ls3a, Ls3b: Supporting arm P: Copper equivalent p1: Copper block p1a: Cooling water channel p2: Shield gas supply pipe p2a: Opening T1: First welding torch T2: Second welding Torch WL: Left vertical plate WR: Right vertical plate w1, w2: welding wire jk, jwa: hose joint

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[Procedure amendment]

[Submission date] October 17, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI B23K 37/02 B23K 37/02 A (72) Inventor Tadahiko Miyagaki 3-4 Tsukiji, Chuo-ku, Tokyo (72) Inventor: Shozo Kami 7-6-1 Higashi-Narashino, Narashino-shi, Chiba Nippon Steel Welding Industry Co., Ltd. No. 1-1 Inside the Kobe Shipyard of Mitsubishi Heavy Industries, Ltd. (72) Inventor Hiroshi Tsujii 1-1-1, Wadazakicho, Hyogo-ku, Kobe City Inside Kobe Shipyard of Sanishi Heavy Industries, Ltd. (72) Inventor Masahiro Ota 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi In the Kobe Shipyard of Sanyo Heavy Industries Co., Ltd. (72) Inventor Akio Kamizawa 1-1-1, Wadasakicho, Hyogo-ku, Kobe-shi Shipyard (72) inventor 當 true Hiroshi Kobe, Hyogo-ku, Wadasaki-cho 1-chome No. 1 Mitsubishi Heavy Industries Co., Ltd. in the Kobe Shipyard & Machinery Works

Claims (3)

[Claims] 1. A vertical direction z of a substantially vertically erected steel plate.
In a vertical electrogas welding apparatus for welding upward while supplying a flux-cored wire to a groove extending to the first electrode, a first electrode whose tip enters the groove;
A second electrode entering a position closer to the groove opening side in the thickness direction x of the steel plate than the tip of the first electrode; a bogie including a drive motor for traveling and rising along the groove; A vertical electrogas welding apparatus, comprising: vibrating means for supporting the first and second electrodes so as to swing the first and second electrodes in the thickness direction x. 2. A first welding power source for applying a negative welding voltage to the first electrode to the steel plate; and a second welding power source for applying a positive welding voltage to the second electrode to the steel plate. 1
The vertical electrogas welding apparatus according to the above. 3. The device according to claim 1, further comprising: means for adjusting a distance between the first electrode and the second electrode in the thickness direction x.
The vertical electrogas welding apparatus according to the above.