JPS5922625B2 - Vertical electrogas welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrogas welding device, and more particularly, the welding torch is moved in the groove at right angles to the direction of welding, from the front to the back of the groove, and from the back to the front. This article relates to an electrogas welding device that performs welding by vibrating in the direction of.

In recent years, electrogas welding equipment, which performs butt welding of steel plates by reciprocating the welding torch from front to back and back to front, has been adopted for welding butt joints in the manufacture of oil storage tanks, steel frames, etc. In particular, recently, in order to improve the operability of the welding equipment and reduce the weight of the equipment, devices that perform welding by lifting only the welding torch and omitting the trolley to raise and lower the equipment have been adopted. I'm starting to let them do it.

The apparatus proposed by the present inventors in Japanese Patent Application No. 50-97768 is one such type, in which only the welding torch is pulled up within the groove surrounded by the copper dowel to perform surface butt welding.

In addition to the lifting mechanism for the welding torch, this device also has a trolley that allows the welding torch to run horizontally, so it can be It has the advantage that surface welding and downward welding can be performed continuously with the same device. However, the scope of application of this device is limited to welding short lengths such as longitudinal materials and downward composite members in shipbuilding, and when the weld length of welding becomes long, not only the welding torch but also the lifting mechanism can be welded. It is necessary to increase the length according to the length, which leads to an increase in the size of the entire device, and its application can be said to be problematic. Furthermore, this device also has a mechanism that reciprocates the traveling truck and reciprocates the welding torch in the plate thickness direction during welding.
Recently, there has been a demand for welding a narrow gap more efficiently by vibrating a welding torch at a higher frequency to increase the effect of dispersing arc heat. However, in general, in order to improve welding workability, it is common to use a groove shape in which the gap is narrow at the back of the groove and wide at the surface. When welding a groove, there is a risk that defects such as insufficient melting may occur unless the vibration of the welding torch is temporarily stopped at the groove surface and an amount of weld metal corresponding to the cross-sectional area of the groove is supplied.

Therefore, in a mechanism such as this device, in which the entire device is reciprocated by repeated forward and reverse rotations of the motor of the traveling cart, and the welding torch is reciprocated in the plate thickness direction, the motor rotates in the forward and reverse directions.
Taking into account inertia, it is difficult to reverse the rotation at high speed, or to temporarily stop the motor rotating at high speed to temporarily stop the welding torch in a fixed position on the groove surface, and the above requirements cannot be met. cannot be satisfied. In view of the above-mentioned problems and phenomena, the present invention provides a vertical electrogas welding device that is simple and has excellent operability. A welding torch is held between the roller and the pressure roller on a base provided with a pressure roller and a shield gas relay box having a consumable gas nozzle at the bottom, and is positioned inside the gas nozzle by passing through the shield gas interruption box, A spring that presses a cam follower supported at an eccentric position of a disk rotated by a motor is attached to one end in the sliding direction of the sliding block that is slidably attached to the sliding shaft, and a bearing is attached to the other end in the sliding direction. The vertical electrogas welding apparatus is characterized in that the base is attached to a sliding block of a vibrating mechanism, which is provided with a push screw for regulating the sliding movement of the sliding block. Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an example of an embodiment of the present invention, and FIGS. 2 and 3 are a side view and a plan sectional view of the main parts of the embodiment. First, in the embodiments shown in FIGS. 1 and 2, a welding torch 5 is inserted into a groove formed by surrounding the materials 1 and 2 to be welded whose ends are butted together by a backing metal 3 and a front metal 4 made of copper plates. This shows a welding device that performs vertical electrogas welding by inserting a

This tubular non-consumable welding torch 5 made of copper or copper alloy with good electrical conductivity has a roller 7 driven by a motor 6 for lifting and lowering the torch, and a pressure roller 9 that is pressurized by a pressure screw 8. It passes through the gas relay box 10, is surrounded concentrically by the erasable gas nozzle 11 provided at the bottom of the gas relay box 10, and is inserted into the groove. Further, the base 12 holding these members is provided so as to be vibrated by a motor 13 via a slider mechanism in the direction of an arrow 14 with a sliding shaft 20 as a guide. The wire 25 that passes through and is supplied to the welding section is also vibrated in the direction of the same arrow 14. Note that the lifting motor 6 that drives the torch up and down is not necessarily limited, and may be moved up and down manually, that is, with a handle or the like. 15 is a screw for clamping the welding device to the material to be welded 2; 16 is a cap for intake of shielding gas; and 24 is a knob for turning a push screw 23 for stopping vibration of the base 12 at one end.

In addition, as a consumable gas nozzle, use materials such as glass fiber woven into a tubular shape or a steel pipe with an extremely thin plate thickness (approximately 0.05 to 0.2 inches) coated with an insulating material. I can do it. Next, the vibration device and its operation in the above-described embodiment will be described with reference to FIG.
A cam follower 18 is pivotally supported at an eccentric position of a disk 17 attached to the motor 13, while a base 12
A sliding block 19 holding the cam follower 19 is slidably provided on a sliding shaft 20 and is pressed against the cam follower 18 by a spring 21. A set screw 23 is provided on a bearing 22 at one end of the sliding stroke of the sliding block 19, and can be moved forward and backward using a knob 24. The rotational motion of the motor 13 is converted into reciprocating simple harmonic motion by a slider mechanism consisting of a sliding block 19 and a sliding shaft 20, causing the base 12 to vibrate in the direction of the arrow 14. At this time, the vibration width w, which is twice the distance between the center of the disk 11 and the center of the cam follower 18, is transmitted to the sliding block 19 as the vibration width, but the movement is regulated by the set screw 23. It becomes the amplitude of W'. That is, the idle rotation time of the disk 17 corresponding to the stroke W-W' becomes the stop time of the sliding block 19. The number of stops is the same as the vibration frequency, and the stop time is adjusted by adjusting the amount of movement of the knob 24. The apparatus according to the embodiment of the present invention is constructed as described above. Next, the operation of the apparatus of the present invention will be explained in accordance with the welding order.

As the wire 25 is fed through the welding torch 5 and melted, the gas nozzle 11 is gradually consumed, and the welding torch 5 is driven by the roller T and raised, and welding progresses.
The shielding gas is taken into the relay box 10 from the mouthpiece 16, passes through the gap between the gas nozzle 11 and the welding torch 5, and shields the welding part. On the other hand, the base 12 attached to the sliding block 19 is vibrated in the direction of the arrow 14, and the welding torch 5 and gas nozzle 11 are similarly vibrated within the groove, distributing heat input evenly from the front to the back of the groove. At the mold groove, the screw 23 is fed as necessary to temporarily stop the vibration at the groove surface and distribute the amount of heat input corresponding to the groove cross-sectional area, while sufficiently melting the groove surface. It fills up the weld metal and produces a sound weld with no defects such as insufficient penetration. As explained above, according to the device of the present invention, the welding torch 5 is lifted up while being held between the roller 7 and the pressure roller 9, so that the applicable welding length can be extended simply by increasing the length of the welding torch 5. In addition, it has a mechanism that temporarily stops the vibration of the welding torch 5 at the groove surface without using electrical control means. The effect is great for welding at a higher frequency than the above, and it is expected that the range of application of vertical electrogas welding equipment will be expanded and improvements in operability will be achieved.

Finally, the effects of the apparatus of the present invention will be concretely illustrated by an example in which welding is performed using the apparatus of the present invention. EXAMPLE A mild steel material having a plate thickness of 3011 Lm, a groove gap of 8 mm, and a 30V groove shape was used as a sample material in the example, and the front and back sides of the groove were surrounded by copper plate padding and welded.

The welding torch 5 is made of copper tube with an outer diameter of 1011 mm and an inner diameter of 2.21 tm, and the consumable gas nozzle 11 has an outer diameter of 14 m.
A glass fiber tube with an inner diameter of 13 m and an inner diameter of 13 mm was used.

The welding conditions are as follows.

Current: 400A, voltage: 40V, welding speed: 4.5CT
! L/min, welding torch vibration frequency; 80 times/min, vibration width;
Wl8m course, W'11mH, vibration H stop time; 0.3
Shielding gas and flow rate during a second/1 vibration cycle;
As a result of welding under the above conditions, CO2.3 Ot/min, wire: flux-cored wire with outer diameter of 1.6ψ, a welded part with good bead appearance and no insufficient penetration was obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the apparatus of the present invention, and FIGS. 2 and 3 are a side view and a plan sectional view of the main parts of the apparatus shown in FIG. 1. 1, 2... Material to be welded, 3... Backing metal, 4... Front metal, 5... Welding torch, 6... ... Lifting motor, 7 ... Roller, 8 ... Pressure screw, 9 ... Pressure roller, 10 ... Gas relay box, 11 ... ... Gas nozzle, 12 ... Base, 13 ... Motor, 14 ... Vibration direction, 15 ... Clamp screw, 16 ...・・Gas intake cap, 17
...Disk, 18...Cam follower 19...Sliding block, 20...
Sliding shaft, 21... Spring, 22... Bearing, 23... Push screw, 24... Knob, 25... Wire.

Claims (1)

[Claims] 1 a roller 7 driven by a torch elevating motor 6;
A welding torch 5 is held between rollers 7 and 9 on a base 12 provided with a pressure roller 9 and a shield gas interruption box 10 having a consumable gas nozzle 11 at the bottom, and passes through the shield gas relay box 10 into the gas nozzle 11. At one end of the sliding block 19 in the sliding direction, which is slidably attached to the sliding shaft 20, there is a spring that presses the cam follower 18 that is pivotally supported at an eccentric position of the disk 17 that is rotated by the motor 13. 21, and the base 12 is attached to a sliding block 19 of a vibration mechanism in which a push screw 23 for regulating the sliding of the sliding block 19 is provided on a bearing 22 at the other end in the sliding direction. Electro gas welding equipment.