JP5429923B2 - Backing material for gas shielded arc-enclosed welding of steel bars - Google Patents

Description

  The present invention relates to a backing material used when butt gas metal arc welding is performed at the end of a bar-shaped workpiece such as a deformed steel bar.

  As a prior art related to a backing material used for conventional gas shield enclose welding, a material made of ceramic fibers (nonwoven fabric) having flexibility and a strip shape (for example, Patent Document 1 or Patent) Document 2), or formed by a flexible conductive member and a fire-resistant flexible member (for example, see Patent Document 3). As an improvement technique for this, there is a technique characterized in that a bar-shaped solid bar-shaped ceramic piece is locked with a steel strip, a steel wire, a ceramic fiber, or the like (see, for example, Patent Document 4).

Japanese Patent Publication No. 4-20706 Japanese Patent Publication No. 4-20707 Japanese Patent No. 2511138 Japanese Patent No. 3378136

  Patent Documents 1 to 4 described above are all invented by the present inventor and have been widely put into practical use as a backing material for gas shield enclosure welding and its welding method. However, these backing metals are not sufficient in terms of contact with the weld metal, and also in the backing material described in Patent Document 4 which has been subjected to advanced improvement technology in order to improve performance. In order to use metal strips, metal wires, ceramic fibers, etc. as a sealing material on the welding surface of the backing material, the formed back bead surface tends to have a fluttering shape, and the backing material is welded to the weld metal after welding There was a problem in use performance that the peelability of the backing material was poor.

In addition, it is costly to bond ceramic fibers, steel strips, and steel wires to the ceramic rod pieces as component materials, and in addition to the cost of the processing and baking process, manufacturing as a backing material There is a problem that the process becomes complicated, and as a result, the cost of the backing material is still relatively high. Moreover, the steel strip and the steel wire are easily rusted after baking, resulting in the disadvantage that the storage and management after production becomes complicated.

The present invention has been made based on recognition of such problems, and can be applied to any shape of a bar-shaped workpiece and has excellent performance as a backing material. The present invention is intended to provide a new backing material for gas shielded arc-enclosed welding that significantly reduces the manufacturing cost.

The present invention is the ceramic member 1 having a rectangular plate shape as defined in claim 1, and the contact surface with the rod-shaped workpiece is a flat use surface 1a having no irregularities, and both end portions of this surface in the rectangular width direction A non-ceramic anchoring adhesive tape 2 having a predetermined width or more is attached to the surface, and the anchoring adhesive tape 2 is attached only to both end portions in the width direction of the backing material, and the central exposed portion of the ceramic member is welded. In addition, it can be cut like a paper-based adhesive tape, and by cutting this, the rectangular plate-shaped ceramic member 1 can be cut to a required length according to the material to be welded, and used. The required number of backing material unit pieces 1c is formed on the back surface opposite to the use surface 1a by providing a plurality of wedge-shaped grooves parallel to each other at a predetermined interval P in a direction orthogonal to the rectangular longitudinal direction. The ceramic member 1 has a wedge-shaped groove 1b. By applying an external force to the minute portion, the backing material unit piece 1c divided by generating a crack from the bottom of the wedge-shaped groove is held in a state that can be bent in the longitudinal direction by the locking adhesive tape 2, and Back for gas shielded arc-enclosed welding constructed to form a bowl-shaped ceramic backing material with flexibility in the ceramic direction and in the direction to twist the ceramic surface depending on the flexibility of the adhesive tape for fastening Related to this material.

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According to the second aspect of the present invention, the length of the rectangular plate-shaped ceramic member is not more than 5 times its width, the thickness is not less than 3 mm, the width of the adhesive tape for locking is not less than 3 mm, and The thickness is 0.1 mm or more, the wedge-shaped groove formed on the opposite side has an opposing angle of 30 degrees or more, the depth is 1/3 or more of the thickness of the ceramic member, and the interval between the wedge-shaped grooves The thickness is 3 mm or more and less than 7 mm, and the backing material for gas shielded arc-enclosed welding according to claim 1 is an embodiment.

The invention as described in claim 3, by locking by a plurality of anchoring adhesive tape a rectangular plate-shaped ceramic member, any claim 1 or claim 2 and adapted to extend as a whole The backing material for gas shielded arc-enclosed welding described in the above is an embodiment.

The present invention is configured as in claim 1, that is, a rectangular plate-shaped ceramic member 1, and the contact surface with the rod-shaped workpiece is a flat use surface 1 a without unevenness, and the rectangular width of this surface A non-ceramic locking adhesive tape 2 having a predetermined width or more is attached to both ends in the direction, and the fixing adhesive tape 2 is attached only to both ends in the width direction of the backing material so as to cover the central exposed portion of the ceramic member. It can be used as a welding surface and can be cut like paper-based adhesive tape. By cutting this, the rectangular plate-shaped ceramic member 1 can be cut to the required length according to the material to be welded. And a plurality of wedge-shaped grooves having a predetermined angle or less in a direction perpendicular to the longitudinal direction of the rectangle on the back surface opposite to the use surface 1a in parallel at a predetermined interval P, thereby providing the required number of backing material unit pieces 1c. The ceramic member 1 is By applying an external force to the wedge-shaped groove 1b portion, the backing material unit piece 1c divided by generating cracks from the bottom of the wedge-shaped groove is held in a state that can be bent in the longitudinal direction by the locking adhesive tape 2. In addition, it is configured to form a bowl-shaped ceramic backing material having flexibility in the ceramic direction and the direction of twisting the ceramic surface depending on the flexibility of the adhesive tape for fastening. Based on the rectangular plate-shaped ceramic member having the shape pattern as described above, it is possible to easily form a hook-shaped backing material having flexibility.
That is, since one type of backing material can cope with the enclose welding of rod-shaped workpieces having various shapes and dimensions, the manufacturing cost of the backing material can be greatly reduced. Further, by optimizing the shape and dimension, it is possible to cope with a change in the shape and dimension of the material to be welded, and it is possible to always form a back bead having an excellent appearance.

And, since the obtained bowl- shaped ceramic backing material is flexible, by applying a force to the wedge-shaped groove 1b and bending and dividing it, a circular cross-section, U-shaped cross-section, polygonal cross-section, etc. It can be applied to a convex rod-shaped workpiece, and a welding operator can cut it to an almost arbitrary length or use it in combination according to the shape and dimension of the workpiece.
In other words, it is possible to cope with a large number of different shape dimensions depending on one type of shape pattern. Further, since the shape of the backing material is integrated into one pattern due to such a cocoon-like ceramic, only one type of manufacturing mold is required, and therefore the manufacturing cost can be greatly reduced.

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According to the second aspect of the present invention, the length of the rectangular plate-shaped ceramic member is not more than 5 times its width, the thickness is not less than 3 mm, the width of the adhesive tape for locking is not less than 3 mm, and The thickness is 0.1 mm or more, the wedge-shaped groove formed on the opposite side has an opposing angle of 30 degrees or more, the depth is 1/3 or more of the thickness of the ceramic member, and the interval between the wedge-shaped grooves When the thickness is 3 mm or more and less than 7 mm, the applicability to the surface of the workpiece is excellent.
In other words, if the interval between the wedge-shaped grooves is as narrow as possible, it is considered to be excellent in adaptability to the surface of the welded material, but if it is too small, the formation yield is reduced and the use of the backing material is reduced. It will take a lot of time and effort. Therefore, it is optimal in practical use that the shape of the rectangular plate-shaped ceramic member is in the range of the above dimensions.

According to the present invention, as described in claim 3, the overall length of the backing material is configured such that a plurality of rectangular plate-like ceramic members are locked by the locking adhesive tape and extended as a whole. It is very easily achieved to set the length to an arbitrary length as required, and therefore it is not necessary to prepare a manufacturing mold separately.

1 to 4 show an embodiment of a backing metal according to the present invention. In the figure, reference numeral 1 denotes a rectangular plate-shaped ceramic member, and in the state shown in the figure, the upper surface side is a flat surface without unevenness for use as a backing material 1a (see FIG. 3). In this state, a plurality of wedge-shaped grooves 1b are provided in parallel on the lower surface side at a constant interval P (see FIG. 4). The wedge-shaped grooves 1b can be easily bent by applying a force to this portion. (Because it is thin), the desired backing material is provided with a hook-like flexibility by dividing it .

  That is, the rectangular plate-shaped ceramic member 1 has a substantially trapezoidal shape in which the opposite surface side is narrower than the use surface 1a as a contact surface with respect to the material to be welded as described later, based on the formation of the wedge-shaped groove 1b. The required number of backing material unit pieces 1c having a unique appearance is formed continuously.

Reference numeral 2 denotes a locking adhesive tape, which is attached to both side edges of a use surface 1a (see FIG. 3) as a backing material in the rectangular plate-shaped ceramic member 1 to thereby fix the rectangular plate-shaped ceramic member 1 Even if it is in a state where it is bent and divided at the required wedge-shaped groove 1b, it is configured to prevent the separation from occurring due to the presence of the adhesive tape 2 for locking.

In FIG. 2, W0 is the width of the backing material, Wt is the width of the adhesive tape for locking, Wa is the width of the wedge-shaped groove, and L0 is the overall length of the backing material.

  In the illustrated embodiment, two rectangular plate-shaped ceramic members 1 having the above-described configuration are integrally connected and formed by the adhesive tape 2 for locking. Basically, however, the rectangular plate-shaped ceramic member 1 is a single sheet. The adhesive tape 2 for locking serves as a means for collectively locking the plurality of rectangular plate-like ceramic members 1 at the same time as preventing the separation of each backing metal A as described above. Is responsible.

And the above-mentioned adhesive tape for anchoring can be easily cut, and by cutting this, the rectangular plate-like ceramic member 1 is appropriately cut to the required length according to the material to be welded. It is configured to be able to.

  FIG. 4 is an enlarged view of the main part of the present invention, in which θ represents the wedge-shaped groove angle, Da represents the wedge-shaped groove depth, and T 0 represents the backing material thickness.

By the way, the rectangular plate-like ceramic member 1 having such a structure is fired by appropriately adjusting SiO2, Al2O3, MgO, CaO and other components in consideration of the back bead forming property and peelability in gas shielded arc welding. Use things.

FIG. 5 shows an application example of the present invention to a workpiece M having a relatively small diameter. It is possible to apply to all deformed steel bars manufactured in Japan by bending and dividing every back piece unit frame (each back piece single piece 1c).

  FIG. 7 shows an application example of the present invention to a material N to be welded having a relatively large diameter. In this case, the backing material unit frame is bent every two pieces. In other words, according to the present invention, the rectangular plate-shaped ceramic member 1 is bent and used at an appropriate position in accordance with the outer surface shape of the material to be welded, so that an oval shape, a U shape, a rail head portion, other polygons, etc. Application to workpieces of various shapes is possible.

  FIG. 6 shows a geometrical relationship in the contact state between the workpiece and the backing material unit piece (the backing material simple substance 1c which is a ceramic piece bent by a wedge-shaped groove). It is desirable that the gap formed between the backing material unit piece and the material to be welded be as small as possible. Further, the facing angle between adjacent backing material unit frames is required to be 130 degrees or more from the smoothness of the back bead. The comparison between the present invention and the prior art (Japanese Patent No. 3378136 presented as Patent Document 4), that is, the comparison of these quantities is as shown in Tables 1 and 2 and Table 3 shown in FIGS.

5 to 7, D0 is the outer shape of the materials to be welded M and N, a is the bending angle formed by the backing material unit piece 1c in contact with the material to be welded, O is the center point of the material to be welded, and A and B Is a contact point between the workpiece and the backing material unit piece 1c, C is a bending point between the backing material unit pieces, Sr is a gap area formed by the material to be welded and the backing material unit piece 1c (= square OACB−) Fan-shaped OAB (refer to FIG. 7), G denotes a gap distance formed by the workpiece and the backing material unit piece 1c (= the hypotenuse OC of the triangle OAC−the radius of the workpiece).

In the present invention, a locking adhesive tape is attached to one surface of a rectangular plate-shaped ceramic member, and wedge-shaped grooves are formed in parallel at regular intervals in the direction perpendicular to the longitudinal direction of the rectangle on the opposite back surface. By applying external force with a finger or a welding tool such as pliers and nippers, cracks are generated from the bottom of the wedge-shaped groove, and the rod-shaped ceramic piece (backing material single piece 1c) is longitudinally locked by the adhesive tape for locking In other words, a state in which the material is foldable, that is, a bowl-shaped ceramic backing material is formed. And the cage-shaped backing material provided with the flexibility to the direction which twists a ceramic surface direction and a ceramic surface with the flexibility of the said adhesive tape can be obtained.

Moreover, this invention can also form the cage-like ceramic backing material of a desired length by continuously locking a plurality of rectangular plate-shaped ceramic members with a locking adhesive tape. The production yield of this rectangular plate-shaped ceramics is related to its length. The longer the yield, the worse the yield (the greater the breakage rate in the production process such as molding and firing). For example, the ratio of the width to the length of the rectangle is 1: 8. In this case, the final yield is about 40%, but by making the ratio 5 or less, the manufacturing yield is improved to 90% or more. Accordingly, the unit length of the rectangular plate-shaped ceramic member 1 is set to 5 or less in the ratio of the rectangular width to the length. By combining and extending a plurality of these, a backing material having a desired overall length can be formed, and the manufacturing cost can be reduced as much as possible.

In this way, a cage-like ceramic backing material that is secondarily flexible as a whole by applying an external force to the backing material that is primarily manufactured as the solid rectangular plate-like ceramic 1 before use. Is obtained. As a method of forming the bowl-shaped ceramic backing material, there is a method in which trapezoidal rod-shaped ceramic pieces are aligned in parallel in a longitudinal direction and then locked at both ends in the width direction with the locking adhesive tape 2. In addition, since the ceramic pieces are easily deformed when the ceramic pieces are formed, the yield is poor, and the subsequent alignment process and locking process are very complicated.

The cage-shaped ceramic backing material thus obtained is flexible and can be applied to convex bar-shaped workpieces such as circular cross-sections, U-shaped cross-sections or polygonal cross-sections. The operator can cut to almost any length according to the shape and dimension of the workpiece and use them in combination.

That is, it is possible to cope with a large number of different shape dimensions depending on one type of shape pattern. Since the shape of the backing material is integrated into one pattern by such a cocoon-like ceramic, only one type of manufacturing mold is required, and the manufacturing cost can be greatly reduced.

If the gap between the wedge-shaped grooves as a means for forming the bowl-shaped ceramic backing material is as narrow as possible, it is excellent in adaptability to the surface of the material to be welded, but if it is too small, the formation yield decreases. There is a limit (3mm or more) because it takes time to bend when using the backing material. Considering the compatibility with the minimum applicable diameter of 10 mm or more with deformed steel bars and the fact that no backing material loss occurs during use, a minimum clearance of 5 mm is appropriate. As a result, the opposing angle α between adjacent ceramic pieces is maintained at an obtuse angle of 130 ° or more, so that a good back bead with few corners can be formed.

When the interval between the wedge-shaped grooves is 7 mm or more, the application is limited to the minimum application diameter of 13 mm or more from the angle α, and there is a problem that the loss of the backing material generated during use is large (see FIG. 8). By setting the minimum distance in this way, the flexibility is doubled, and the gap distance G and the gap area Sr generated when the welded material and the backing material come into contact with each other are almost halved (see FIGS. 9 and 10). Since the adhesion becomes good, it is not necessary to attach an expensive intermediate buffer material such as a ceramic nonwoven fabric required in the prior art as an action to fill the gap.

Further, the adhesive tape 2 for locking has only an adhesive force and strength for preventing the ceramic piece (the backing material simple substance 1c) from being separated after being bent, and at the same time bendable at the bending position. It is desirable that it is inexpensive, and a paper-based adhesive tape having a predetermined width (3 mm or more) and thickness (about 0.1 mm or more) may be used.

Further, the adhesive tape 2 for locking is attached only to both ends in the width direction of the backing material in consideration of the influence on welding, and the central exposed portion of the ceramic is used as the welding use surface. The welding surface of the backing material must be a flat surface with no irregularities. If unevenness is formed on this surface, an opening is formed between the ceramic pieces adjacent to each other (backing material simple substance 1c) at the time of bending, and the gap with the material to be welded is increased. This is because molten metal spill accidents are likely to occur.

The width of the rectangular plate-shaped ceramic member 1 may be about 1.5 times the maximum width (about 20 mm) of the groove interval in the enclosure weld joint construction. The thickness is 3 mm or more from the maximum depth at which the backing material is melted by the welding arc and slag is formed to form a molten pool.

Fig. 8 shows the optimal dimension analysis table of the shaped steel bar gas shielded arc-enclosed welding backing material. Table A shows the present invention and Table B shows the prior art. This confirms the following. It was done.
That is, by setting the length of the backing material single 1c (piece or piece) to 5 mm, the angle between the backing material pieces can be secured at 130 degrees or more for all the steel bars to be welded. In addition, there is no unusable coma loss that occurs at the time of use, and a steel bar diameter that is an angle between frames of 130 degrees or more in the case of two-frame bending is known. These things were confirmed.

9 and 10 show a table of gap areas formed between the deformed steel bar and the backing material, Table A shows the case of the frame size P = 5 mm of the present invention, and Table B shows the frame size 2P of the present invention. FIG. 10 shows a case where the conventional frame size P = 7 mm, and Table D shows a case where the conventional frame size 2P = 14 mm. As a result, the following was confirmed.
In other words, it was confirmed that the gap area in all of the welded deformed steel bars was less than half that of the prior art.

FIG. 11 is a table showing the gap distance formed between the deformed steel bar and the backing material, and this confirmed the following.
That is, it was confirmed that the gap distance in all of the deformed steel bars to be welded was also halved or less compared to the prior art.

It is a front view of the backing material which concerns on the Example of this invention. It is a top view same as the above. It is a side view same as the above. It is an enlarged view of the circular arc part shown with the dashed line in FIG. It is explanatory drawing which shows the example of application of this invention with respect to a to-be-welded material of a comparatively small diameter. FIG. 6 is a schematic diagram illustrating a geometric relationship in a state in which the backing material unit piece is in contact with the material to be welded in the embodiment illustrated in FIG. 5. It is explanatory drawing which shows the example of application of this invention with respect to the to-be-welded material of a comparatively big external shape. Table (Table 1) of the optimal dimension analysis of the backing material for deformed steel bar gas shield arc enclosure welding, comprising Table A and Table B, Table A showing the present invention, Table B showing the prior art Is. It is a table | surface (Table 2) which shows the clearance gap area formed between a deformed steel bar and a backing material, Comprising: Table A and Table B, Table A shows the case where the top dimension P = 5mm of this invention, B represents the case of the frame size 2P = 10 mm of the present invention. It is a table | surface which shows the clearance gap area formed between a deformed steel bar and a backing material, Comprising: Table C and Table D, Table C is a case where the frame size P = 7mm of a prior art, Table D is a prior art This represents the case of the frame size 2P = 14 mm. It represents a table (Table 3) showing the gap distance formed between the deformed steel bar and the backing material.

1 Rectangular plate-shaped ceramic member
1a Use surface as backing material
1b Wedge groove
1c Backing material unit piece 2 Locking adhesive tape

Claims (3)

It is a rectangular plate-shaped ceramic member (1), and the contact surface with the rod-shaped workpiece is a flat working surface (1a) with no irregularities, and non-ceramics with a predetermined width or more are connected to both ends of the rectangular width direction of this surface. impregnated adhesive tape (2) stopped, also the joint sealing adhesive tape (2) together with the central exposed portion of the welding working surfaces ceramics member is affixed only to the widthwise ends of the backing strip , which can be cut like paper-based adhesive tape has a rectangular plate-like ceramics member (1) by cutting it so that it can be used to cut the required length depending on the material to be welded, By providing a plurality of wedge-shaped grooves parallel to each other at a predetermined interval (P) in the direction orthogonal to the rectangular longitudinal direction on the back surface opposite to the use surface (1a), the required number of backing material unit pieces (1c) is formed, and the ceramic member (1) applies an external force to the wedge-shaped groove (1b). Thus, the backing material unit piece (1c) divided by generating cracks from the bottom of the wedge-shaped groove is held in a state that can be bent in the longitudinal direction by the locking adhesive tape (2), and gas shielded arc enclosed welding configured so as to form the interdigital ceramic backing material which comprises a flexible in the direction of twisting the ceramics surface direction and ceramics surface depending on the flexibility of the connecting sealing adhesive tape Backing material. The length of the rectangular plate-shaped ceramic member is 5 times or less the width and the thickness is 3 mm or more, the width of the adhesive tape for locking is 3 mm or more, and the thickness is 0.1 mm or more, the opposite side The wedge-shaped grooves formed on the substrate have an opposing angle of 30 ° or more, a depth of 1/3 or more of the thickness of the ceramic member, and an interval between the wedge-shaped grooves of 3 mm or more and less than 7 mm. The backing material for gas shielded arc-enclosed welding according to claim 1. The back for gas shielded arc-enclosed welding according to any one of claims 1 and 2, wherein a plurality of rectangular plate-like ceramic members are extended by being locked by a locking adhesive tape. This material.

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