JP2009269064A - Gas metal enclosed welding equipment for bar-shaped member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas metal enclosed welding equipment comprising a backing metal and a shielding head as a welding equipment. <P>SOLUTION: The gas metal enclosed welding equipment for a bar-shaped member includes: a backing metal that surrounds nearly half the circumference of a prescribed portion at both ends of a pair of bar-shaped members to be welded of which grooved faces are oppositely arranged coaxially with a prescribed groove space apart; a shielding head member that is oppositely inserted in a prescribed center portion of the backing metal and that surrounds nearly half the circumference remaining at both ends of the members to be welded on the side opposite from the backing metal; a rectangular opening that is formed, for a welding operation purpose, in the direction roughly vertical to the opposing shaft of the members to be welded in the center of the shielding head member; and at least a pair of shielding gas discharging grooves that are parallel to the opposing major axis faces of the rectangular opening. At the chip end of the discharging grooves, semi-annular openings with a prescribed width are oppositely installed along the outer circumference of the members to be welded. Additionally, in the intermediate part of the discharging grooves, a rectifier that uniformizes the discharged shielding gas flow is arranged. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a welding apparatus for performing butt gas metal arc welding of a bar-shaped workpiece such as a deformed steel bar at the end thereof, and particularly comprises a backing metal part and a shield head part as a welding apparatus. The present invention relates to a gas metal enclosure welding apparatus to be performed.

  As a conventional gas shield means related to enclosed welding, a rectifying body is arranged in a flow path, and two upper and lower layers of shield gas flow rectified thereby are caused to collide with each other at a welding operation opening (for example, patents). Reference 1)), or a technique in which a plurality of narrow jet trains are ejected symmetrically with respect to the construction opening in a plurality of specific directions (for example, Patent Document 2 and Patent Document 3).

Japanese Patent Publication No. 7-29204 Japanese Patent No. 2003-098621 Japanese Examined Patent Publication No. 1-202367

  Patent Document 1 described above is an invention (1989) by the present inventor and has been widely put into practical use with high performance as a gas shield means. However, since the constituent means is complicated, there is a problem that the processing cost of the shield device portion is very high.

Further, in Patent Document 2 and Patent Document 3, a plurality of high-speed turbulent fine jet gas rows are arranged in a predetermined direction, and two rows are directed and ejected toward the material to be welded. Although it is a characteristic method, there has been a problem that the shielding property is deteriorated due to the entrainment of the outside air caused by directly jetting the high-speed jet into the welding work opening and the groove space. Further, the shield device has a problem that the structure is complicated and the processing cost is high as in the case of Patent Document 1.

  Furthermore, in the above-described conventional technology, the rectifier and gas outlets that constitute the main part are opened on the welding work space side, so that they are directly exposed to the super-high-temperature and high-speed spatter generated during welding. As a result, the problem that the spatter adheres to this portion and is blocked easily occurs. Therefore, there has been a problem that it is necessary to frequently perform a cleaning operation such as removing spatters adhering to these parts or replacing the rectifier itself.

  The present invention is based on the simplification of the gas shielding means, and ensures a favorable gas shielding performance and avoids direct exposure of the rectifier as the main means of shielding to the sputtering. The present invention aims to provide a new “gas metal enclosure welding apparatus for rod-like members” which improves the use characteristics of the apparatus and solves the conventional problems as described above.

  Further, according to the present invention, the processing cost of the entire apparatus can be reduced by reducing the manufacturing cost of the backing metal used detachably integrated with the shield means.

  The present invention provides a backing metal 11 that surrounds a predetermined portion of both end portions of a pair of rod-like welded materials M, M that are coaxially arranged with a predetermined groove interval to face the groove surface, and substantially half-circumferentially; A shield head member A is inserted opposite to the central predetermined portion of the backing metal 11 and surrounds the remaining substantially half circumference of both end portions of the workpieces M, M opposite to the backing metal 11, A shield head opening A1 having a rectangular shape for welding operation formed in a center portion of the member A in a direction substantially perpendicular to the opposed axis of the materials to be welded M and M is parallel to the opposing long diameter surface of the opening A1. And at least a pair of shield gas guide grooves 2d, and a semicircular cutout portion 2a having a predetermined width along the outer periphery of the material to be welded M at the lower end portion of the guide groove 2d. A rectifier 5 for uniformizing the flow of the shield gas discharged in the middle of the groove 2d Those of the gas metal enclosed welding apparatus for rod-like member, characterized in that the arranged

  And, according to the present invention, as described in claim 2, the shield head member A is separably engaged and surrounds a predetermined portion of both end portions to which the materials to be welded M and M are joined substantially half-circumferentially. As a backing metal, a plurality of steel pieces that have been heat-cut from a plate with a predetermined thickness to the same shape are stacked and welded in a direction crossing the stacking interface to form the required backing metal shape. A gas metal enclosure welding apparatus for a rod-shaped member according to claim 1 is used as an embodiment.

  The present invention is configured as described in claim 1, that is, a predetermined portion at both ends of a pair of rod-shaped welded materials M, M provided with a predetermined groove interval and having a groove surface facing each other coaxially. A backing metal 11 that surrounds substantially half the circumference, and surrounds the remaining substantially half circumference of both ends of the welded materials M, M that are inserted opposite to the center predetermined portion of the backing metal 11 and opposite to the backing metal 11 A shield head opening A1 having a rectangular shape for welding operation formed at a central portion of the shield head member A in a direction substantially perpendicular to the opposed axis of the workpieces M and M; At least a pair of shield gas guide grooves 2d parallel to the opposing major surface of the opening A1, and a semicircular notch with a predetermined width along the outer periphery of the welded materials M and M at the lower end of the guide groove 2d. The portion 2a is provided oppositely and discharged to the intermediate portion of the guide groove 2d. Since the rectifying body 5 for uniformizing the shield gas flow is arranged, the shielding property by the shield gas in the groove space which is the premise of the enclosing welding and the good usability in welding construction are extremely simple structure. And can be achieved by inexpensive means. Further, since the backing metal 11 for backing up the backing material 30 is not directly exposed to an ultra-high temperature arc, use of an inexpensive steel material is permitted.

  The present invention has a configuration as described in claim 2, that is, is engaged with the shield head member A in a separable manner, and substantially surrounds a predetermined portion at both ends to which the welded materials M and M are joined. As a backing metal, a plurality of steel pieces that have been thermally cut from a plate with a predetermined thickness into the same shape are stacked and welded in a direction crossing the stacking interface to form the required backing metal shape. By configuring to use gold, the formation of backing metal 11 will be achieved based on the reuse of waste material. That is, since the backing metal is manufactured based on an inexpensive processing method mainly including thermal cutting and welding, the manufacturing cost of the backing metal can be significantly reduced.

In the present invention, the shield head member A shown in FIGS. 1 to 3 is connected to the backing metal member B as shown in FIGS. 4 and 5, and the shield as shown in FIGS. The present invention relates to a welding apparatus for performing welding with respect to a material to be welded in a state where the head A and the backing metal B are connected with the material to be welded sandwiched therebetween.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 show the shield head member A alone. That is, the shield head A member has shield side walls 3 and 3 attached to the inner surfaces of the opposing front and rear engagement arms 4 and 4 (see FIG. 2), and both sides of the engagement arms 4 and 4 are attached. The shield gas introduction bodies 1 and 1 are installed near the upper edge of the part, and the shield gas discharge bodies 2 and 2 are attached to the inner part thereof. The engaging arms 4 and 4 are for clamping and fixing to a backing metal 11 of a backing metal member B, which will be described later, at a portion near the lower edge thereof. The engaging arms 4 and 4 are orthogonal to the meeting surface of the shield head member A and the backing metal 11 to be described later, and the side surfaces of the engaging arms 4 and 4 are blocked to create a gap on the meeting surface. Therefore, it also has a function to prevent outside air from entering the groove space from the side.

  Further, in the central portion of the shield head member A, the shield gas discharge bodies 2 and 2 and the shield side wall bodies 3 and 3 make the axial direction of the material to be welded T, which will be described later, the short side and the material to be welded M. A shield head opening A1 having a rectangular shape with a long side in the direction orthogonal to the axial direction is formed.

  Further, a semicircular (half-cylindrical) cutout for forming a semicircular shield gas discharge port is formed below the long side facing surface of the opening A1, that is, in the lower half of the shield gas discharge bodies 2 and 2. A portion 2a (see FIG. 3) is provided, and a semicircular shield gas discharge port 1e (see FIG. 7) is formed on the basis of the semicircular cutout portion 2a in a state where the material to be welded T is fixed. It is comprised so that.

  In addition, a semicircular (semi-cylindrical) cutout portion 1a having a radius larger than that of the material to be welded is formed at the lower edge of the shield gas introduction body 1 and 1, and is formed in the upper half of the material to be welded. It is comprised so that it may be located along.

  The shield gas introduction bodies 1 and 1 have a shield gas introduction hole 1b provided therein, and guide the shield gas through a plurality of shield gas jets 1c arranged on the opposite long side of the opening A1. A passage communicating with the groove 2a and reaching the shield gas discharge port 1e (see FIG. 7) is formed. Reference numerals 1d and 1d denote gas introduction pipes connected to the shield gas introduction bodies 1 and 1 described above.

  A rectifier 5 is disposed in the middle of the shield gas guide groove 2d, and is configured to rectify and equalize the high-speed non-uniform gas flow ejected from the shield gas ejection port 1c.

The engaging arms 4 and 4 described above are perpendicular to the meeting surface of the backing metal 11 in the shield head member A and the backing metal member B, which will be described later. Even in the case of creating a gap, the function to prevent the outside air from entering the groove space from the side surface is made to work.

4 and 5 show a backing metal member B. The backing metal member B is placed on the backing metal 11 having the following form and the upper surfaces of both side portions thereof. Fastening arms 10 and 10 pivotally supported at one end to hold M, fastening bolts 8 and 8 and fastening nuts 9 for fastening the fastening arms 10 and 10 at the other end , 9. When the backing metal 11 is opposed to the shield head member A (see FIG. 7), the surface facing the shield head member A has a semicircular shape (semi-cylindrical shape) having a radius larger than the material to be welded T by a predetermined amount. ), That is, a surface facing the shield head member A, is formed with a semi-cylindrical concave surface 11a for contacting the material to be welded M. A storage pocket 11b for storing a backing material 30, which will be described later, is formed at the central portion of the semi-cylindrical concave surface 11a.

  FIG. 6 shows the backing metal 11 alone. Usually, the backing metal 11 is integrally formed from the same material by means of die cutting or forging. The surface facing the shield head member A is provided with a semi-cylindrical concave surface 11a for contacting the material to be welded. Further, a storage pocket 11b having a belt-like predetermined depth is provided at the longitudinal center of the concave surface. A backing material 30 is disposed in the pocket 11b. As shown in FIGS. 7 and 8, the backing material 30 is made of ceramic or the like that is housed in the storage pocket 11b and forms a cylindrical inner surface in a strip shape. The depth of the storage pocket 11b is determined by the arc resistance of the non-metallic backing material, and 4 mm or more is appropriate for the ceramic backing material. The width should be 15mm or more in order to secure the weld metal outflow prevention effect.

  FIG. 10 shows a backing metal according to another embodiment of the backing metal 11 described above, and the arm backing metal 11A and the pocket backing metal that are cut out from the steel plate into a predetermined shape by laser cutting or the like. A plurality of 11Bs are laminated and integrated with a welding strip 11C formed on the laminated surface in a direction perpendicular to the surface by means of TIG welding or laser welding. That is, when the backing metal is formed of a single metal material as shown in FIG. 6, a large material is required. However, by adopting the configuration as shown in FIG. A backing gold can be formed.

7 to 9 show an embodiment of the present invention, that is, a state in which the shield head member A and the backing metal member B are set to be welded materials M and M which are to be welded and are opposed to each other with a predetermined interval. It represents. That is, this is a case where the workpieces M and M are arranged in the horizontal direction and welded. The backing metal 11 and the shield head member A are connected and fixed to each other by the engagement arm 4. Further, the tightening mechanism as described above is provided at both end portions of the backing metal 11, and thereby, it is fastened and fixed to the welding end portions of the pair of materials to be welded M.

  In the state shown in the figure, for example, as shown in FIG. 7, the joining surfaces of a pair of materials to be welded M, M are arranged while being held at a predetermined groove interval, Apply backing money 11 from below. At that time, the backing material 30 is stored in the storage pocket 11 b of the backing metal 11. Then, the fastening arm 10 is rotated and fitted to the materials to be welded M, M, and fastened by the fastening nut 9 to be fixed in a state where the ends of the materials to be welded are bridged. At this time, by arranging the backing material 30 so as to slightly protrude from the inner surface of the semicylindrical of the backing metal 11, the adhesion between the backing material 30 and the welded materials T and T can be improved. Next, the engagement arm 4 of the shield head member A is inserted and fitted into the center portion of the backing metal 11. As a result, a construction space for welding construction is formed at the end of the workpiece.

  In the set state as described above, the rectified uniform shield gas passes through the shield gas discharge port 1e through the shield gas introduction hole 1b, the shield gas ejection port 1c, the rectifier 5 and the shield gas guide groove 2d. It is supplied to the space W. The shield gas guide groove 2d is opened in parallel to the opposing long sides of the shield head opening A1, and the rectifying gas faces downward as a whole, and the gap between the surface of the workpiece to be welded, the shield head member A and the backing metal 11 And the groove space W is filled to exclude outside air. Most of the rectifying gas collides and bends on the surface of the materials to be welded M, M, and goes to the groove center in a semi-cylindrical shape, where it meets the counter flow and flows toward the groove back and to the opening. And the groove space W is filled, and then flows out from the shield head opening.

  Further, due to the collision with the materials to be welded M, M, a flow that is directed to the opposite side of the flow and a gap between the materials to be welded M, M are caused to flow downward. These flow out to the outside along the gaps between the backing metal 11, the shield head member A, and the workpieces M and M, thereby preventing the outside air from entering through the gaps.

  As described above, as shown in FIG. 9, the multidirectional flow from the inside to the outside of the groove space W as a whole is achieved by a simple means of directing the rectified uniform flow toward the workpieces M and M. A flow is generated, and the groove space W is always kept in a good shield state.

  Thereafter, the welding wire is inserted into the groove space W through the contact tip of the welding torch, and a welding arc is generated at the bottom thereof. The arc is traversed / scanned / reversed along the substantially circular groove surface, and semi-weaving is applied in the groove surface direction so that the groove surface is melted and fused according to the filling height of the weld metal. Repeat the operation sequentially. In this way, the weld metal is completely filled in the groove, and an appropriate surplus is added to complete the joint.

  In the above-described embodiment, the workpiece is arranged in the horizontal direction. However, even in the case where the workpiece is arranged in the vertical direction or the inclined direction, the principle is completely the same as the embodiment. is there. The present invention can be implemented in such a form.

  In the present invention, a non-metallic backing material is applied to the groove space between the steel bars to be welded and approximately half the circumference of the joining end portions thereof through a metal backing metal, and further, the backing material is sandwiched between them. The shield head member A is inserted and connected to the backing metal member B in a state of being opposed to the backing metal. Thus, the end portion of the material to be welded and the groove space W are surrounded by the nonmetallic backing material 30 backed up by the backing metal 11 and the shield head member A. Then, a welding wire is inserted into the groove space W through the welding contact tip from the opening A1 for welding construction provided in the shield head member A, and an arc is formed and manipulated from the inner part to weld the weld metal. At the same time as placing in the space, the welded material is joined by fusing the groove surfaces.

  At the time of this welding construction, the welding material M is supplied with a shielding gas from a pair of shielding gas discharge ports 1e provided in the range of a substantially half circumference along the outer circumference of the welding material at the bottom of the opening crossing surface of the welding material axis. , M causes a flow toward the opening A1 and the groove center along the surface in the axial direction of the workpiece based on the collision. At the same time, a flow in the opposite direction and downward is created. Since these shield gas flows are a uniform flow with little turbulence rectified through the rectifier 5 provided in the shield gas discharge groove 2d, after flowing out from the discharge port forming notch 2a. Minimize the risk of outside air getting involved.

The flow as described above meets in the groove space W along the materials to be welded M, M, fills and stays in the space, and then prevents the outside air from entering upward. Then, the latter flow flows outward from the gap between the welded material and the backing metal in the direction opposite to the flow and toward the bottom, and blocks the outside air from the gap. In this way, the groove space W can be reliably gas-sealed from the inside by the shielding gas. For this reason, the rectifier 5 for making the shield gas flow uniform is disposed in the back of the discharge groove and is not directly exposed to the spatter generated during welding.

  Incidentally, the embodiment shown in FIG. 10 is engaged and integrated with the shield head member A so as to surround the joint portion of the materials to be welded M and M, and to back up the non-metallic backing material to constitute the welding construction space. As the metal 11, a rectangular plate cut from a general-purpose thickness steel plate into a predetermined semi-circular shape is formed by thermal cutting, and a plurality of these are laminated so that the semi-circular portion forms a semi-cylinder, A backing metal block is formed by cross-welding and integrating the laminated interface of the rectangular plates.

In the present invention, the welding arc directly acts on the non-metallic backing material, and the backing metal itself as a backup function is not directly exposed to the super high temperature welding arc. However, in conventional enclose welding, a very thick block of copper and copper alloy, which is expensive from the viewpoint of thermal diffusibility with respect to the welding arc, was used as the backing metal material, and this was formed by machining. It was produced at a high processing cost. On the other hand, by adopting the configuration as described above (configuration shown in FIG. 10), a steel plate as the most versatile and inexpensive material can be used. By combining processing technologies that are much cheaper in comparison, the material costs and processing costs of the backing metal can be significantly reduced. Also, various means can be applied to the means for forming a large functional block body as a whole by laminating a plurality of regular cross-sectional shapes from a relatively thin plate and combining them with appropriate means. As a material, it can be used for metals and ceramics other than steel.

It is a front view showing the shield head member which is the principal part in this invention. It is a top view same as the above. It is the XX sectional view taken on the line in FIG. It is a front view of the backing metal member which is the principal part in this invention. It is a side view same as the above. It is the perspective view which represented the backing money independently. It is a longitudinal cross-sectional view in the center of a to-be-welded material axis | shaft in the state which pinched | interposed the to-be-welded material between the shield head member and backing metal. It is a cross-sectional view in the center of the opening same as above. It is a schematic diagram which shows the shield state by a shield gas flow in the state shown in FIG. It is a perspective view showing other examples of backing money.

Explanation of symbols

A Shield head member A1 Shield head opening 1 Shield gas introduction body
1a Semi-circular cutout
1b Shield gas introduction hole
1c Shield gas outlet
1d gas inlet pipe
1e Shield gas outlet
2 Shield gas discharger
2a Semi-circular cutout for forming shield gas outlet
2d Shield gas guide groove
3 Shield side wall 4 Engaging arm 5 Rectifier B Backing metal member 8 Clamping bolt 9 Clamping nut
10 Tightening arm
11 Backing money
11a Semi-cylindrical concave surface
11b storage pocket
30 Backing material M Welded material W Groove space
11A Arm part backing gold
11B pocket pocket back money
11C welding strip

Claims (2)

A backing metal (11) that surrounds a predetermined portion of both ends of a pair of rod-shaped welded materials (M, M) that are coaxially arranged with a predetermined groove interval and facing the groove surfaces facing each other substantially half-circularly; A shield head member (see FIG. 2) that is inserted opposite to the center predetermined portion of the backing metal (11) and surrounds the remaining substantially half circumference of both ends of the welded material (M, M) opposite to the backing metal (11). A),
A shield head opening (A1) having a rectangular shape for welding operation formed in a direction substantially perpendicular to the opposed axis of the material to be welded (M, M) at the center of the shield head member (A), and the opening At least a pair of shield gas guide grooves (2d) parallel to the opposing major surface of the part (A1), and a predetermined width along the outer periphery of the material to be welded (M, M) at the lower end portion of the guide grooves (2d) A semicircular notch (2a) is provided oppositely,
A gas metal enclosure welding apparatus for a rod-shaped member, characterized in that a rectifying body (5) for uniformizing a flow of shield gas to be discharged is disposed in an intermediate portion of the guide groove (2d). A plate having a predetermined thickness as a backing metal that is separably engaged with the shield head member (A) and surrounds a predetermined portion of both end portions to which the materials to be welded (M, M) are joined substantially half a circumference. 2. The steel sheet according to claim 1, wherein a plurality of steel pieces thermally cut into a predetermined shape are stacked, and a backing metal formed into a desired backing metal shape by welding in a direction crossing the lamination interface. Gas metal enclosure welding equipment for rod-shaped members.

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