JPH0731888Y2 - Ultra-thin material lap joint welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ultra-thin material lap joint welding device.

[Conventional technology]

Conventionally, in welding and assembling a fuel transportation container for nuclear power generation, for example, a pole having a vertical surface having a height of about 10 mm on the side of an overlapping portion having a thickness of 0.2 to 0.4 mm and a few mm on a lower plate having a thickness of 3 to 5 mm. When stacking thin material upper plates and welding the lap joint by TIG welding, electron beam welding, laser welding, etc., while pressing so that the upper plate and the lower plate are very close to the welding arc, Temporary welding by arc welding is performed with a denseness of several mm pitch, and then main welding is performed.

However, the length of one joint is about 4 m, which is 150-160
For structural parts that also have joints, TIG welding, electron beam welding,
In order to perform welding work such as laser welding with high efficiency, such a dense tack welding method must be roughened, but if the tack welding pitch is rough, the arc heat will cause thermal deformation to expand around the molten pool. Therefore, there is a problem that a gap is generated between the upper plate and the lower plate, and as a result, welding heat is increased in the ultrathin upper plate and only the upper plate is melted so that a good bead cannot be formed. Further, since the vertical surface of the upper plate is close to the arc generation point of tack welding, there is a high risk of melting due to arc heat, and it is necessary to provide a heat shield for the vertical surface.

[Problems to be solved by the device]

The present invention has been proposed in view of such circumstances,
An object of the present invention is to provide an ultra-thin material lap joint welding device capable of performing welding and assembling of a large-sized ultra-thin structure without temporary welding and with high efficiency and high quality.

[Means for Solving the Problems]

For this reason, the present invention is an apparatus for welding a lap joint of an upper plate having a vertical surface on the side of an overlapping portion of a thickness of less than 1.0 mm and a few mm and a relatively long lower plate by arc welding or high energy beam welding. A water-cooled copper plate that is supported by a welding head support that moves along the lap joint welding line and covers at least the arc or beam front upper surface of the upper plate overlapping portion and the upper surface near the vertical surface and has a slit through which the arc or beam passes. And a welding torch or beam nozzle supported by the welding head support portion with its tip facing the slit.

[Action]

With the above-described configuration, it is possible to obtain an ultra-thin material lap joint welding device capable of performing welding and assembling of a large-sized ultra-thin structure without temporary tack welding and with high efficiency and high quality.

〔Example〕

An embodiment in which the ultra-thin material lap joint welding device of the present invention is applied to TIG welding will be described with reference to the drawings. FIG. 1 is a perspective view of the entire device, FIG. 2 is a plan view of a pressing plate in the same, and FIG.
FIG. 4 and FIG. 4 are sectional views taken along lines III-III and IV-IV of FIG. 2, respectively.

In the figure above, the thickness of 1.0mm is on the relatively long bottom plate 1.
The upper plate 2 having a vertical surface 2a of less than 10 mm and a height of about 10 mm is 3 to 5 m.
Overlapped at m overlapping portions, a pressing plate 4 which is made of copper or copper alloy and has a tapered portion 5 at the front end and the rear end is mounted on the lap joint 3 so as to be slippery. A slit 6 having a width a corresponding to the formation of the arc 20 is formed at a substantially central portion of the pressing plate 4 in the front-rear direction, and a heat shield portion 7 having a width b on the vertical surface 2a side.
The taper surface 8 is formed at right angles in the front-rear direction while leaving the above, and an upward taper surface 8 is formed in the front-rear direction to form a Y-shaped cross-section groove as shown in FIG. In addition, a bead formation escape portion 9 is engraved on the bottom of the pressing plate 4 near the heat shield portion 7, and a cooling hose 10 for supplying cooling water is connected to the front and rear of the side edge portion. A cooling water passage (not shown) is bored in the inside of 4 up to the vicinity of the slit 6.

Thus, a pair of guide shafts 12 are erected on the connecting plate 11 fixed to the upper surfaces of the front and rear ends of the pressing plate 4 and a compression spring 13 for pressing the guide shafts 12 around them with a constant force.
Is externally fitted, and the upper end of the guide shaft 12 is passed through the guide 14,
It is supported by a head support plate 15 on the side of a traveling vehicle (not shown). A welding torch 18 is vertically provided on a slide mounting plate 16 attached to the guide 14 via left and right and up and down slides 17 (right and left in the figure), and a tungsten electrode 19 is provided at a lower end of the welding torch 18 with a slit 6 It is mounted to generate an arc 20 directed at.

In such a device, when an arc 20 is generated between the tungsten electrode 19 and the lap joint 3 while the head support plate 15 is moved at an appropriate speed by a traveling carriage (not shown), the arc of the ultrathin upper plate 2 is generated. 20 front and back upper surface, vertical surface
With the upper surface of the side portion near 2a being pressed by the pressing plate 4, the arc 20 accurately flew to the lap joint 3 through the slit 6 to form a good bead, while the upper plate 2 was water-cooled. The thermal deformation of the pressing plate 4 does not occur, and the vertical surface 2a of the vertical plate 2a is completely shielded from the heat of the arc 20 by the water-cooled heat shield 7 and is not melted. In addition, at this time, the occurrence of the arc 20 can be sufficiently monitored by the tapered surface 8 of the slit 6.

Thus, according to such a device, the lap joint 3 in which the ultrathin upper plate 2 having the vertical surface 2a is superposed on the long lower plate 1 can be used efficiently and with good quality without tack welding.
G welding can be performed.

[Effect of device]

In short, according to the present invention, a lap joint of an upper plate having a vertical surface on the side of an overlapping part of a thickness of less than 1.0 mm and a few mm and a relatively long lower plate are welded by arc welding or high energy beam welding. A water-cooling apparatus, which is supported by a welding head support that moves along the lap joint welding line, covers at least the front upper surface of the arc or beam of the upper plate overlapping portion and the upper surface near the vertical surface, and has a slit through which the arc or beam passes. By providing a pressing plate made of a copper plate and a welding torch or beam nozzle supported by the welding head support part with its tip facing the slit, temporary assembly and welding of large ultra-thin structures can be omitted. At the same time, an ultra-thin material lap joint welding device that can be constructed with high efficiency and high quality is obtained, so the present invention is extremely useful industrially.

[Brief description of drawings]

FIG. 1 is a perspective view of the entire apparatus in one embodiment in which the ultra-thin material lap joint welding apparatus of the present invention is applied to TIG welding, FIG. 2 is a plan view of the pressing plate in the same, and FIGS. FIG. 3 is a sectional view taken along line III-III, IV-IV in FIG. 2. 1 ... Lower plate, 2 ... Upper plate, 2a ... Vertical surface, 3 ... Lap joint, 4 ... Holding plate, 5 ... Tapered part, 6 ... Slit, 7 ... Heat shield part, 8 ... … Tapered surface, 9 …… Bead formation relief part, 10 …… Cooling hose, 11 …… Connecting plate, 12…
… Guide shaft, 13 …… Compression spring, 14 …… Guide, 15 …… Head support plate, 16 …… Slide mounting plate, 17 …… Slide,
18 …… welding torch, 19 …… tungsten electrode, 20 …… arc.

Claims (1)

[Scope of utility model registration request] 1. A device for welding a lap joint of an upper plate having a vertical surface to the side of an overlapping part of a thickness of less than 1.0 mm and a few mm and a relatively long lower plate by arc welding or high energy beam welding. And a water-cooled copper plate that is supported by a welding head support that moves along the lap joint welding line and that covers at least the front upper surface of the arc or beam of the upper plate overlapping portion and the upper surface near the vertical surface and that has a slit through which the arc or beam passes. And a welding nozzle supported by the welding head supporting portion with the tip facing the slit, and an ultra-thin material lap joint welding device.