JP3395658B2 - Crater treatment method for welded end - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for removing a crater generated at a welding end portion when base materials are welded to each other.
The present invention relates to a method for treating a crater at a welded end. 2. Description of the Related Art In general, when welding base materials, a V-shaped groove is formed at a predetermined groove angle between both butted ends, and this groove is formed. A bead is formed to fuse the two base materials together. Although arc welding is widely used in ships and ironworks, it is known that such arc welding produces a depression called a crater at the end of the bead, and this crater causes cracks in the welded part Conventionally, an end tab is used as a countermeasure for this, and when this end tab is not used, turning welding or back welding is always performed. [0003] The end tab is pre-attached across both base materials at the welding end, and a crater is formed on the end tab by extending the welding end to the end tab and terminating the end. This end tab is cut off by gas cutting or the like after welding is completed. [0004] However, in the conventional crater treatment method for a welded end, in the case of using an end tab, the edges of both base materials to be welded are aligned. Condition. However, as shown in FIG. 5, when one of the base materials 1 protrudes more than the edge 2a of the other base material 2, that is, when the other base material 2 that is short is welded in the middle of one base material 1. When the end tab 3 is to be used, the end tab 3 is
a and a corner portion between the base material 2 and the edge 2 a of the base material 2. Therefore, when welding is performed in this state, in order to extend the bead 4 in the direction of the end tab 3 from the original welded portion, the bead 4 is pulled along the butt portion between the end tab 3 and the side edge 1a of the base material 1. Become.
For this reason, there is a problem that a portion of the base material 1 that abuts on the end tab 3 is melted by the bead 4 and damages a part of the base material 1 that should not be welded. Accordingly, the present invention has been made in view of such a conventional problem, and when welding both base materials in a state where one base material protrudes from an edge of the other base material, a crater is added to a welded portion. It is an object of the present invention to provide a crater treatment method for a welded end portion that can prevent remaining of the base material and prevent damage to portions other than the welded portion of the base material. [0006] To achieve SUMMARY OF THE INVENTION The above objects, crater processing method of the welded end portion of this onset Ming,
A first base material, and a second base material having a side edge welded to the first base material by a butt joint, a T joint, or a corner joint, wherein the first base material extends from a weld end of the second base material. is further extended, the crater processing method of the welded end corner portion is formed between the end edge of the first base material and second base material, the
On the first base metal, from the side edge on the non-weld side to the side edge on the weld side
And cut in advance along the cut line of the extra length after welding.
In addition to forming, heat is applied to the tip of the notch.
Internal stress generated by the
A stop hole is formed at the end of the second base material in the welding direction to extend with a dimension at least larger than the length of a crater formed at the weld end, and is disposed at the corner. A long portion is formed, and the side edge of the extra length portion is cut obliquely and with a groove so as to form a triangular space between the first base material and the first base material. At the time of welding with the second base material, a non-welding member is applied to the triangular space, and welding is continuously performed from the groove between the first and second base materials to the groove, thereby welding at the extra length. terminate the, then, as to remove the non-weld member, those characterized by excising the extra length portion
It is. The operation of the present invention will be described below with the above structure. A groove is formed at an extra length formed at the end of the second base material in the welding direction, and the first base material and the second base material are formed. At the time of welding with the material, since welding is continuously performed from the groove portion between the first and second base materials to the groove and the welding is terminated at the extra length portion, it is formed at the welding end end. The crater to be formed can be removed from the original welded portion and formed on the extra length. Therefore, by cutting off the excess length after welding, it is possible to prevent the crater from remaining in the original welded portion between the first and second base materials. At this time, since the groove is inclined in a direction away from the side edge of the first base material, the bead is prevented from coming into contact with the extended portion of the first base material deviating from the original welded portion. be able to. Therefore, it is possible to prevent a portion of the first base material that should not be welded from being damaged by welding. Further, when welding the groove of the extra length,
Since the non-welding member is applied to the triangular space formed between the side edge of the first base material and the groove of the extra length portion, the non-welding member covers the non-welded portion of the first base material. Can be protected. Therefore, the bead can be easily guided to the groove by the non-welding member, the bead can be smoothly separated from the side edge of the first base material, the cross-sectional change due to welding can be smooth, and the spatter scattered by welding can be reduced. (1) to prevent adhesion to the side edges of the base material, and
Even if the bead enters the extra length straight from the welded portion by mistake, the non-welding member protects the side edge of the first base material and prevents the side edge from being melted by the bead. it can. Further, the upper Symbol extra length part, by previously forming a cut portion along the cut line after welding leaving forming portion of the groove, bead when excising extra length portion after completion of the welding It is sufficient to cut only the groove portion to be embossed, and the operation of cutting off the excess length can be performed easily and quickly. Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of a crater treatment method for a welded end according to the present invention. FIG. 1 is an enlarged plan view of a main part, FIG. 2 is an enlarged perspective view of a main part, and FIG. It is a perspective view which shows the attachment state of a steel frame. That is, in the crater treatment method for a welded end portion of the present embodiment, as shown in FIGS. 1 and 2, a steel beam 10 as a first base material and a reinforcing material 12 as a second base material are welded. The crater processing method of the present invention is applied to a part. As shown in FIG. 3, the steel beam 10 is formed of I-shaped steel comprising upper and lower flanges 14, 16 and a web 18, and the end face of the steel beam 10 is attached to a side surface 20a of a steel tube column 20 having a rectangular cross section. Joined by welding. Then, the reinforcing member 12 is provided at the joint end of the steel beam 10.
It is welded across the side edges 14a, 16a of the upper and lower flanges 14, 16 and the side surface 20a of the steel pipe column 20. As shown in FIGS. 1 and 2, the reinforcing member 12 has both side edges 12a along upper and lower flanges 14 and 16, respectively.
12b are formed in parallel, the edge 12c welded to the steel pipe column 20 is cut vertically, and the opposite edge 12c is cut.
d is inclined such that the inner edge 12a to be welded to the steel beam 10 has a longer side and the outer edge 12b has a shorter side, and is formed in a trapezoidal shape as a whole. Since the reinforcing member 12 is disposed at the ends of the upper and lower flanges 14 and 16, the reinforcing member 1
The upper and lower flanges 14 and 16 are extended from the edge 12d of the upper and lower flanges 1 and 2 of the reinforcing member 12.
Corner portion C between the side edges 14a and 16a
Is formed. The reinforcing member 12 includes upper and lower flanges 14, 1
6, a K-shaped groove 22 having V-shaped grooves formed on both sides is formed on the inner edge 12a, and a bead 24 is formed on the K-shaped groove 22 so that the reinforcing member 12 and the upper and lower flanges 14 are formed. , 1
6 is welded. K type groove 22
Instead of this, it is also possible to form a groove with a V-shaped groove formed on one side. In this embodiment, when the reinforcing member 12 is welded to the upper and lower flanges 14 and 16, the reinforcing member 12 is formed at least on the edge 12 d serving as a welding end portion of the reinforcing member 12 at the welding end. The crater 26 is extended with a dimension larger than the length L of the crater 26 to form an extra length portion 28 disposed at the corner portion C. On the surface of the extra length 28, the upper and lower flanges 14,
A groove 30 that is inclined in a direction away from the side edges 14a, 16a of the 16 is cut out. And the K-shaped groove 2
2 is continuously welded to the groove 30 and the welding is terminated at the extra length portion 28 so that the crater 26 formed at the welding end portion is located at the extra length portion 28. . In addition, a triangular space S is formed in the extra length portion 28 by cutting off the side edges 14a, 16a of the upper and lower flanges 14, 16 and the groove 30, and the welding is performed. In performing this, a ceramic tab 32 as a non-welding member is applied to the triangular space S. The ceramic tab 32 is formed in a triangular shape corresponding to the triangular space S, and the ceramic tab 32 covers the entire area of the triangular space S. Although the non-welded member is formed as the ceramic tab 32, the non-welded member may be formed of a high melting point material that does not melt by welding steel, and for example, copper or the like can be used instead of ceramic. In order to weld the reinforcing member 12 to the steel beam 10, the inner edge 12a of the reinforcing member 12 is pressed against the side edges 14a, 16a of the upper and lower flanges 14, 16, and the triangular space is formed. In the state where the ceramic tab 32 is applied to S, the beads 24 are put along the K-shaped groove 22 from the steel pipe column 20 side. The bead 24 ascends continuously from the terminal edge 12d of the reinforcing member 12 and the groove 3 of the extra length 28
0 and the bead 24 is terminated when it has sufficiently entered the extra length 28. After that, the ceramic tab 32 is removed and cut along the boundary between the reinforcing member 12 and the extra length portion 28 to cut off the extra length portion 28. At this time, in the present embodiment, the extra length 28
A slit 34 is formed in advance as a cut portion along the cut line after welding, leaving a portion where the groove 30 is formed. A stop hole 3 is provided at the tip of the slit 34.
4a is formed to prevent the internal stress generated by heat from being concentrated on the tip of the slit 34. Further, the cut portion may be formed as a V-shaped cut portion 36 as shown in FIG. Therefore, in the method for crater treatment of the welded end portion of the present embodiment, the upper and lower flanges 1 of the steel beam 10 are used.
The inner edges 12a of the reinforcing member 12 are welded to the side edges 14a, 16a of the reinforcing members 12, and the beads 24 are formed along the K-shaped groove 22 of the inner edge 12a of the reinforcing member 12 to be applied. Served. At this time, a groove 30 is formed in the excess length portion 28 formed at the end of the reinforcing member 12 in the welding direction, and welding is continuously performed from the K-shaped groove 22 to the groove 30 so that the bead 24 remains. Since the welding is terminated at the long portion 28, the crater 26 formed at the end of welding can be removed from the original welded portion, that is, the groove 22 of the reinforcing member 12, to form the extra length 28. it can. Therefore, by cutting off the excess length portion 28 where the crater 26 is formed after welding, it is possible to prevent the crater 26 from remaining at the original welded portion between the steel beam 10 and the reinforcing member 12. At this time, the groove 30 formed in the extra length portion 28 is formed by the side edges 14a, 16a of the upper and lower flanges 14, 16.
Since it is inclined in a direction away from the groove, the bead 24 can be prevented from contacting the lower flanges 14 and 16 extending from the reinforcing member 12 when welding the groove 30. Therefore, it is possible to reliably prevent a portion of the steel beam 10 that should not be welded from being welded, thereby preventing the steel beam 10 from being damaged. Further, when welding to the groove 30 of the extra length portion 28, the ceramic tab 32 is applied to the triangular space S of the extra length portion 28. The unwelded portions 14 and 16 can be covered and protected. Therefore, the bead 24 can be easily guided from the groove 22 to the groove 30 by the ceramic tab 32, and the bead 24 can be smoothly separated from the side edges 14a, 16a of the upper and lower flanges 14, 16, and the cross section by welding can be obtained. The change can be made smooth, and the spatter scattered by welding can be prevented from adhering to the side edges 14a, 16a of the first and second flanges 14, 16. In addition, even if the bead 24 enters the extra length 28 straight along the forming direction of the groove 22 erroneously, even if the groove 30 is inclined, the ceramic tab 32 Are the side edges 14 of the upper and lower flanges 14 and 16
a, 16a can be protected to prevent the side edges 14a, 16a from being melted by the bead 24. In the present embodiment, the extra length 28
Since the slit 34 is formed along the cutting line except for the portion where the groove 30 is formed, the extra length 28
It is sufficient to cut off only the groove 30 where the bead 24 is piled up when cutting off, and the work of cutting off the excess length portion 28 can be performed easily and quickly. This is the same when the V-shaped notch 36 shown in FIG. 4 is formed.
In this embodiment, when cutting off the extra length portion 28, first, the groove 30 is gouged by 3 to 5 m.
m is cut off, and the end face is finished to a smooth curved surface with a grinder. Further, in the present embodiment, the case where the present invention is applied to the reinforcing material 12 at the connection portion between the steel beam 10 and the steel pipe column 20 has been disclosed. It is needless to say that the present invention can be applied to a welding portion of a member to be welded which is extended from the above. [0027] In the crater processing method of weld end of this onset bright As described above, according to the present invention, forming a groove in the elongated portion which is formed in the welding direction end portion of the second base member Since the crater at the end of welding can be formed in the extra length by continuously welding to the groove, the crater is prevented from remaining in the original welded portion, and Strength can be secured. And, since the groove is obliquely inclined, the bead is prevented from coming into contact with the extended portion of the first base material deviating from the original welded portion, and the portion of the first base material that should not be welded is removed. Damage due to welding can be prevented. Further, when welding to the groove, the side edge of the extra length portion is notched so as to have a groove, and the ceramic tab is inserted into a triangular space formed between the first base material and the ceramic tab. Because the ceramic tab is used, the bead can be easily guided to the groove by the ceramic tab, and the bead can be smoothly separated from the side edge of the first base material, so that the cross-sectional change due to welding can be made smooth. Also, since the non-welded portion of the first base material can be covered and protected by the ceramic tab, spatter scattered by welding can be prevented from adhering to the side edge of the first base material, and the welding portion can be erroneously welded. Even when the bead enters the extra length straight from above, the ceramic tab can protect the side edge of the first base material and prevent the side edge from being melted by the bead. Further, in the crater treatment method of welding ends, to the extra length portion, since the preformed notch portion along the cut line after welding leaving forming portion of the groove, complete welding It is only necessary to cut off only the groove portion where the bead is laid when the extra length portion is cut later, and an excellent effect that the operation of cutting off the extra length portion can be performed easily and quickly is achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged plan view of a main part showing one embodiment of a crater processing method of the present invention. FIG. 2 is an enlarged perspective view of a main part showing one embodiment of a crater processing method of the present invention. FIG. 3 is a perspective view showing an assembled state of a steel frame using the crater processing method of the present invention. FIG. 4 is a perspective view of a main part showing another embodiment of the crater processing method of the present invention. FIG. 5 is a perspective view showing an example of a conventional crater processing method. [Description of Signs] 10 Steel beam (first base material) 12 Reinforcement material (second base material) 22 Groove 24 Bead 26 Crater 28 Extra length 30 Groove 32 Ceramic tab (non-weld member) 34 Slit (cut portion) ) 36 Notch (notch)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23K 9/00

Claims (1)

(57) [Claim 1] A first base material, and a second base material whose side edge is welded to the first base material by a butt joint, a T joint or a corner joint. A crater treatment method for a welded end in which a first base material is further extended from a welded end of a second base material to form a corner portion between the first base material and an edge of the second base material; The first base material is directed from the side edge on the non-weld side to the side edge on the weld side.
The notch along the resection line of the extra length after welding.
And at the tip of the notch,
The internal stress generated by heat collects at the tip of the notch.
A stop hole is formed to prevent the crater from going inside, and is extended at an end in the welding direction of the second base material with a dimension at least larger than a crater length formed at the welded end, and disposed at the corner. A surplus portion is formed, and the surplus portion side edge is cut off diagonally and with a groove so as to form a triangular space between the first base material and the first base material. At the time of welding with the second base material, a non-welding member is applied to the triangular space, and welding is continuously performed from the groove portion between the first and second base materials to the groove so that the extra length portion is formed. A crater treatment method for a welded end, wherein welding is terminated, and thereafter, the non-welded member is removed and a surplus portion is cut off.