JP2001129665A - Welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method easy to attach a backing material and capable of preventing occurrence of welding defect. SOLUTION: This method comprises butt welding the abutting surface of a steel plate B2 against a steel plate A1. The end face of a backing material 3 which is provided, on its upper face 31, with a groove 35 having, a bottom face 351 inclined toward the direction stepping away from the abutting portion, is abutted on the steel plate A1. Then, the end face of the steel plate B2 is abutted against the plate A1 at an interval 15 in such a state that the plate B2 is mounted on the backing material 3, and the abutting portion is welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a welding method.

[0002]

2. Description of the Related Art In a conventional welding method, an iron plate B is butted against an iron plate A, and welding is carried out along a gap between the butted portions to be joined. This welding method will be described with reference to FIGS.

[0003] First, as shown in Fig. 7 (a), the most common welding is to butt an iron plate B200 against an iron plate A100, and to place a welding rod 30 between the iron plate A100 and the iron plate B200.
Heat with a welding torch 400 while applying zero.
0 and the iron plate A100 and the iron plate B200 in the vicinity of the welding rod 300 are melted, and the molten metal 500 is built up between the iron plate A100 and the iron plate B200 and welded.

At this time, as shown in FIG. 7 (b), the iron plate A100 and the iron plate A100 were butted against each other in order to store a large amount of molten metal 500 between the iron plate A100 and the iron plate B200 and to strengthen the welding. The gap 150 between the metal B200 was provided. Then, there is a problem that the molten iron flows downward from the gap 150. As a method for solving such a problem, as shown in FIG. 8A, a backing material 600 is applied to the lower side of the gap 150 to perform welding while preventing the molten metal from flowing down.

[0005] That is, as shown in FIG.
00, the end faces of the backing material 600 are
00, the iron plate B200 is placed on the iron plate B2.
The end face of 00 is butt-joined to the iron plate A100 with a gap 150 provided, and is welded by building up along the gap 150 at the butt portion between the iron plate A100 and the iron plate B200. On this occasion,
A groove 650 having a bottom surface inclined in the butting direction is provided on the upper surface of the backing material 600 so that the molten metal 500 easily accumulates at the butting portion. As shown in FIG. The molten metal 500 is built up on the inclined bottom surface and is welded firmly.

[0006]

However, in the above method, there is no suitable means for butting and holding the end face of the backing material 600 on the iron plate A100, and it is difficult to hold the backing material 600 in the butted state. Was. For example, iron plate A10
When the end face of the iron plate B200 is welded by abutting the edge of the iron plate B200, the backing material 600 can be welded while holding the backing material 600 with a vice or the like inserted from the end.
100 is wide and if the end face of the iron plate B200 is welded to the place where the vise does not reach even if the vise is inserted from the end, it is difficult to hold the backing material 600 with the vise. .

[0007] Further, when heated by the welding torch 400, as shown in FIG. 8 (a), a sputter 550 is generated in which a lump of the molten metal 500 scatters in all directions. In particular, when the surface of the steel plate is plated, impurities such as oil are attached, or welding conditions are not optimal, a large amount of the spatter 550 is generated. Moreover, this sputter 55
9 falls into the groove 650 and flows on the inclined bottom surface of the groove 650 as shown in FIG.
As shown in (b), a place with a deep groove, that is, an iron plate A10
It accumulates at the place where the end faces of the iron plate B200 abut against each other.

[0008] Then, the surface of the sputter 550 is oxidized and, as shown in FIG. 9 (b), remains without being melted into the molten metal, or the void 700 is easily generated in this portion. As a result, this sputter 550
The weld area is reduced due to the void 700 and the void 700, and the mechanical strength of the welded portion is inferior, resulting in poor welding. Therefore, an object of the present invention is to provide a welding method that improves the above-mentioned problems, that is, a welding method that can easily attach a backing material and does not cause poor welding.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. According to the first aspect of the present invention, an end face of an iron plate B is abutted against an iron plate A, and the abutted portion is joined. A welding method for welding, wherein the iron plate A is
The end surfaces of the backing material provided with grooves having a bottom surface inclined in a direction away from the butted portion on the upper surface are butted, and the iron plate B is placed on the backing material. Are provided, butted and welded along the gap between the butted portions of the iron plate A and the iron plate B.

According to a second aspect of the present invention, there is provided a welding method in which an end face of an iron plate B is abutted against an iron plate A, and the abutted portion is welded. A magnet is attached to the iron plate A by a magnetic force. With the backing material placed on top, the end face of the backing material is butted against the iron plate A, and with the iron plate B placed on this backing material, the end face of the iron plate B is butted with the iron plate A provided with a gap. The welding is performed by building up along the gap between the butted portions of the iron plate A and the iron plate B.

(Function) According to the first aspect of the present invention, the iron plate A
Butt the end surface of a backing material provided with a groove having a bottom surface inclined in a direction away from the butt portion on the upper surface, and put the iron plate B on the backing material. The iron plate A and the iron plate B are welded by welding along the gap between the butting portions of the iron plate A and the spatter scattered at the time of welding fall into the groove of the backing material. , And accumulates at a location distant from the place where the iron plate A and the iron plate B meet.
In addition, voids generated during the sputter also occur in the portion where the sputter has accumulated.

As described above, the spatter and the voids generated by the spatter accumulate at a location remote from the welded portion,
There is no portion where the tip of the iron plate B meets the iron plate A. Therefore, welding failure does not occur. According to the second aspect of the present invention, a magnet is attached to the iron plate A by a magnetic force, the backing material is placed on the magnet, the end faces of the backing material are abutted, and the iron plate B is placed on the backing material. In this state, the end face of the iron plate B is butted against the iron plate A with a gap provided between the iron plate A and the iron plate B.
Since the backing material and the iron plate B are welded along with the gap between the butting portions of the above, the backing material and the iron plate B are butted against the iron plate A by the magnetic force of the magnet in a state where the magnets are placed.

With this configuration, it is not necessary to support the iron plate B by another means such as a vise, and the iron plate B can be easily brought into contact with the iron plate A even at a position where the vise cannot reach. As a result, the end surface of the iron plate B can be butted against the iron plate A, and the butted portion can be easily welded.

[0014]

Next, embodiments of the present invention will be described with reference to examples. (Embodiment 1) FIGS. 1 to 3 show one embodiment of the present invention. FIG. 1 is a perspective view showing a welding state, and FIG.
3 is a cross-sectional view taken along line AA of FIG. 3, and FIG. 3 is a cross-sectional view showing a state where welding is completed.

1 to 3, reference numeral 1 denotes an iron plate A of a steel plate, and reference numeral 2 denotes an iron plate B of a steel plate. Reference numeral 3 denotes a backing material made of steel. As shown in FIGS. 2 and 3, the backing material 3 is used in contact with the iron plate A1 and is inclined on the upper surface 31 in a direction away from the butted portion. A groove 35 having a bottom surface 351 is provided. 4 is a welding rod.

5 is a molten welding rod 4, an iron plate A1, an iron plate B
Reference numeral 2 denotes an integrated molten metal lump, and the molten metal lump 5 adheres firmly to the iron plate A1 and the iron plate B2 when cooled. Reference numeral 6 denotes a welding torch for heating the welding rod 4, the iron plate A1, and the iron plate B2. Reference numeral 7 denotes spatter scattered during welding. Numeral 8 is a void generated at the time of melting.

Next, a description will be given of a welding method and an operation for welding the end faces of the iron plate A1 and the iron plate B2. First, the end face of the backing material 3 is butted against the iron plate A1, and the backing material 3 is fixed with a vice or the like.

Next, the iron plate B2 is placed on the backing material 3, and the end faces of the iron plate B2 are butted with the gap 15 provided in the iron plate A1.
The welding torch 6 heats the tip of the welding rod 4 while applying the tip of the welding rod 4 to the gap 15 at the butted portion of the welding rod 4, and simultaneously melts the welding rod 4, and at the same time, the iron plate A1 and the iron plate B2 near the melted welding rod 4. Is melted.

Then, a molten metal lump 5 is generated, and the molten lump 5 adheres along the gap 15 between the iron plate A1 and the iron plate B2. Then, the spatter 7 scattered during this welding falls into the groove 35 of the backing material 3 and flows along the inclined surface of the bottom surface 351 of the groove 35, leaving the place where the iron plate A1 and the iron plate B2 meet. Accumulate in position. Further, voids 8 generated during the sputter 7 are also generated in a portion where the sputter 7 has accumulated.

Thus, the sputtering 7 and the sputtering 7
The void 8 caused by the accumulation accumulates at a position distant from the welded portion, and is not present at a portion where the tip of the iron plate B2 abuts against the iron plate A1. Therefore, welding failure does not occur.

(Embodiment 2) FIGS. 4 to 6 show another embodiment of the present invention. FIG. 4 is a perspective view showing a state in which the tip of an iron plate B is butted to an iron plate A and welded. 5 is a cross-sectional view taken along line BB of FIG. 4, and FIG. 6 is a cross-sectional view showing a state where welding is completed.

4 to 6, reference numeral 1a denotes an iron plate A of a steel plate.
And 2a is an iron plate B of a steel plate. 3a is a steel backing material, and this backing material 3a is used by abutting an iron plate A1a as shown in FIGS.
The upper surface 31a has a groove 35a having a bottom surface 351a inclined in a direction away from the abutting portion. 4a is a welding rod.

5a is a molten welding rod 4a, an iron plate A1a,
The iron plate B2a is an integrated molten metal lump, and the molten metal lump 5a firmly adheres to the iron plate A1a and the iron plate B2a. 6a is welding rod 4a, iron plate A1a, iron plate B
This is a welding torch for heating 2a. 7a is spatter scattered during welding. 8a is a void generated at the time of melting. 9a is a magnet.

Next, a welding method and an operation for welding the iron plate A1a and the end face of the iron plate Ba will be described. First, a magnet 9a is attached to the iron plate A1 by magnetic force.
The end surface of the backing material 3a is abutted against the iron plate A1 in a state where the backing material 3a is placed on "a". In this way, the backing material 3a can be held against the iron plate A1 by the magnet 9a, so that no special means such as a vise is required, and the iron plate A
The backing material 3a can be held even in the central portion of the iron plate A1 where the width of the first member 1 is so wide that a vise cannot be used.

Next, the iron plate B2a is placed on the backing material 3a, and the ends of the iron plate B2a are butted with the iron plate A1a having a gap 15a therebetween.
The welding torch 6a heats the tip of the welding rod 4a while applying the tip of the welding rod 4a to the gap 15a between the butted portions of the welding iron 4a and the iron plate B2a. A1a and the iron plate B2a are melted. Then, a molten metal lump 5a is generated, and the molten lump 5a is formed in the gap 15 between the iron plate A1a and the iron plate B2a.
When adhered along the line a and cooled, it is welded as a build-up.

The spatter 7a scattered during this welding falls into the groove 35a of the backing material 3a, flows along the inclined surface of the bottom surface 351 of the groove 35a, and abuts the iron plate A1a and the iron plate B2a. Accumulates at a distance from
The sputter 7a and the voids 8a generated between the spatters 7a are also generated in the portion where the sputter 7a is accumulated. As described above, the spatter 7a and the voids 8a generated by the spatter 7a accumulate at a location remote from the welded portion, and are not present at the portion where the tip of the iron plate B2a abuts against the iron plate A1a. Therefore, welding failure does not occur.

[0027]

According to the first aspect of the present invention, an end face of a backing material provided with a groove having a bottom surface inclined in a direction away from the abutting portion on the upper surface is brought into contact with the iron plate A, and the iron plate is placed on the backing material. B on the iron plate A and the end face of the iron plate B
Are welded along the gap between the butting portions of the iron plate A and the iron plate B, so that spatters generated during welding are separated from the butting portion of the iron plate A and the iron plate B. And does not adhere to a portion where the tip of the iron plate B abuts on the iron plate A, and does not cause poor welding.

According to a second aspect of the present invention, a magnet is attached to the iron plate A by a magnetic force, and an end surface of the backing material is abutted against the iron plate A with the backing material placed on the magnet. Since the iron plate B is placed on the iron plate B, the end faces of the iron plate B are butted against the iron plate A with a gap therebetween, and the welding is performed by overlaying along the gap between the butted portions of the iron plate A and the iron plate B.
The backing material and the iron plate B can be abutted against the iron plate A by the magnetic force of the magnet in a state where the magnet is placed, and it is easy to make the iron plate B contact the iron plate A. As a result, the iron plate B can be easily welded to the iron plate A.

[Brief description of the drawings]

FIG. 1 shows one embodiment of the present invention, and is a perspective view showing a state where welding is being performed.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view showing a state where welding is completed.

FIG. 4 is a perspective view showing another embodiment of the present invention, in which a tip of an iron plate B is butted against an iron plate A and is welded.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a cross-sectional view showing a state where welding is completed.

7A and 7B show an example of a conventional welding method, in which FIG. 7A is a perspective view showing a welding state, and FIG.
It is sectional drawing in the C line.

FIG. 8 shows another example of a conventional welding method.
Is a perspective view showing a welding state, and (b) is D in (a).
FIG. 3C is a cross-sectional view taken along line D, and FIG.

FIG. 9 shows a problem of a conventional welding method.
FIG. 3 is a cross-sectional view showing a state in which spatter has accumulated, and FIG.

[Explanation of symbols]

 1, 1a Iron plate A 2, 2a Iron plate B 3, 3a Backing material 4, 4a Welding rod 5, 5a Lump of molten metal 6, 6a Welding torch 7, 7a Sputter 8, 8a Void 9a Magnet

Claims (2)

[Claims] 1. A welding method for abutting an end face of an iron plate B on an iron plate A and welding the abutted portion, wherein the iron plate A includes a groove having a bottom surface inclined on a top surface in a direction away from the abutted portion. When the iron plate B is placed on the backing material and the iron plate B is placed on the backing material, the end surface of the iron plate B is butted against the iron plate A with a gap therebetween. A welding method characterized by overlaying and welding along. 2. A welding method in which an end face of an iron plate B is butted against an iron plate A, and the butted portion is welded. A magnet is attached to the iron plate A by magnetic force, and a backing material is placed on the magnet. With the end of the backing material abutted against the iron plate A while the iron plate B is placed on the backing material,
A welding method, wherein an end face of an iron plate B is butt-joined to the iron plate A with a gap therebetween, and welding is performed by building up along the gap between the butt portions of the iron plate A and the iron plate B.